All rights reserved. No part of this document may be
reproduced or transmitted in any form or by any means,
electronic, mechanical, photocopying, recording, or
otherwise, without prior written permission from
Beckman Coulter, Inc.
Find us on the World Wide Web at:
www.beckmancoulter.com
Page 3
Read all product manuals and consult with Beckman Coulter-trained personnel before attempting
!
to use this equipment. Do not attempt to perform any procedure before carefully reading all
instructions. Always follow product labeling and manufacturer’s recommendations. If in doubt as
to how to proceed in any situation, contact your Beckman Coulter Representative.
This safety notice summarizes information basic to the safe use of the rotors described in this
manual. The international symbol displayed to the left is a reminder to the user that all safety
instructions should be read and understood before operation or maintenance of this equipment is
attempted. When you see the symbol on other pages of this publication, pay special attention to the
safety information presented. Observance of safety precautions will also help to avoid actions
that could damage or adversely affect the performance of the rotor. These rotors were developed,
manufactured, and tested for safety and reliability as part of a Beckman Coulter ultracentrifuge/
rotor system. Their safety or reliability cannot be assured if used in an ultracentrifuge not of
Beckman Coulter’s manufacture or in a Beckman Coulter ultracentrifuge that has been modified
without Beckman Coulter’s approval.
Alerts for Danger, Warning, Caution, and Note
Safety Notice
DANGER
DANGER indicates an imminently hazardous situation which, if not avoided,
will result in death or serious injury.
WARNING
WARNING indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation, which, if not avoided,
may result in minor or moderate injury. It may also be used to alert against unsafe
practices.
NOTE
NOTE is used to call attention to notable information that should be followed during installation, use,
or servicing of this equipment.
Safety Information for the SW 32 Ti and SW 32.1 Ti Rotors
Handle body fluids with care because they can transmit disease. No known test offers complete
assurance that such fluids are free of micro-organisms. Some of the most virulent —Hepatitis (B and
C) viruses, HIV (I–V), atypical mycobacteria, and certain systemic fungi—further emphasize the
need for aerosol protection. Handle other infectious samples according to good laboratory
LXL-TB-015BB
iii
Page 4
Safety Notice
Safety Information for the SW 32 Ti and SW 32.1 Ti Rotors
procedures and methods to prevent spread of disease. Because spills may generate aerosols,
observe proper safety precautions for aerosol containment. Do not run toxic, pathogenic, or
radioactive materials in these rotors without taking appropriate safety precautions. Biosafe
containment should be used when Risk Group II materials (as identified in the World Health
Organization Laboratory Biosafety Manual) are handled; materials of a higher group require more
than one level of protection.
The rotors and accessories are not designed for use with materials capable of developing flammable
or explosive vapors. Do not centrifuge such materials in nor handle or store them near the
centrifuge
Although rotor components and accessories made by other manufacturers may fit in the SW 32 Ti
and SW 32.1 Ti rotors, their safety in these rotors cannot be ascertained by Beckman Coulter. Use of
other manufacturers’ components or accessories in these rotors may void the rotor warranty and
should be prohibited by your laboratory safety officer. Only the components and accessories listed
in this publication should be used in this rotor.
Attach all six buckets, loaded or empty, to the rotor for every run. Make sure that filled containers
are loaded symmetrically into the rotor and that opposing tubes are filled to the same level with
liquid of the same density. Make sure that buckets containing Quick-Seal tubes have the proper
floating spacers inserted (if applicable) before installing the bucket cap.
If disassembly reveals evidence of leakage, you should assume that some fluid escaped the rotor.
Apply appropriate decontamination procedures to the centrifuge and accessories.
Never exceed the maximum rated speed of the rotor and labware in use. Refer to the section on Run
Speeds, and derate the run speed as appropriate.
Do not use sharp tools on the rotor that could cause scratches in the rotor surface. Corrosion begins
in scratches and may open fissures in the rotor with continued use.
iv
LXL-TB-015BB
Page 5
Contents
Safety Notice,iii
Alerts for Danger, Warning, Caution, and Note, iii
Safety Information for the SW 32 Ti and SW 32.1 Ti Rotors,iii
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors,1
Specifications for the SW 32 Ti Rotor,1
Specifications for the SW 32.1 Ti Rotor,2
Description,3
Preparation and Use,4
Prerun Safety Checks,4
Rotor Preparation,4
Operation,6
Removal and Sample Recovery,7
Tubes and Accessories,7
Run Times,12
Run Speeds,13
Selecting CsCl Gradients,19
Adjusting Fill Volumes,19
Typical Examples for Determining CsCl Run Parameters,20
Care and Maintenance,21
Maintenance,21
Cleaning,22
Decontamination,23
Sterilization and Disinfection,23
Storage,23
Returning a Rotor,23
Supply List,24
Replacement Rotor Parts,24
Other,25
Warranty
v
Page 6
vi
Page 7
Illustrations
1Arranging Tubes Symmetrically in the Rotor Buckets,6
2Precipitation Curves for the SW 32 Ti Rotor.r,15
3CsCl Gradients at Equilibrium for the SW 32 Ti Rotor,16
4Precipitation Curves for the SW 32.1 Ti Rotor,17
5CsCl Gradients at Equilibrium for the SW 32.1 Ti ,18
Illustrations
vii
Page 8
Tables
Tables
1Beckman Coulter Tubes and Accessories for the SW 32 Ti
Rotor,8
2Beckman Coulter Tubes and Accessories for the SW 32.1 Ti
Rotor,9
3Relative Centrifugal Fields for the SW 32 Ti and SW 32.1 Ti
a. Relative Centrifugal Field (RCF) is the ratio of the centrifugal acceleration at a specified radius and speed (rw2) to the standard acceleration of
gravity (g) according to the following formula: RCF = r/g — where r is the radius in millimeters, is the angular velocity in radians per
second (2 RPM /60), and g is the standard acceleration of gravity (9807 mm/s
2
). After substitution: RCF = 1.12r (RPM/1000)
2
2
LXL-TB-015BB
Page 11
Description
1
5
4
3
2
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Description
1. Black Cap
2. O-ring (812715)
3. Bucket (SW 32 Ti)
4. Rotor
5. Overspeed Disk (335456)
These Beckman Coulter rotors have been manufactured in an ISO 9001 or 13485 facility for use with the
specified Beckman Coulter ultracentrifuges.
The SW 32 Ti and SW 32.1 Ti are swinging bucket rotors designed to centrifuge up to six tubes each.
Used in Beckman Coulter class H, R, and S preparative ultracentrifuges, these rotors develop
centrifugal forces for the separation of subcellular particles and viruses in density gradients. The
rotors have a common rotor body with buckets that can be used interchangeably (see
Rotor
Preparation). Bucket and rotor body positions are numbered for operator convenience.
The rotor body and buckets are made of titanium, finished with polyurethane paint. Bucket caps are
made of aluminum, anodized for corrosion resistance. Each bucket and cap assembly sets into
grooves in the rotor body. O-rings, made of Buna N rubber, between each bucket and bucket cap
maintain atmospheric pressure inside the buckets during centrifugation.
For overspeed protection, a Beckman Coulter ultracentrifuge equipped with a photoelectric
detector will monitor the overspeed disk on the rotor bottom and shut down the run if a speed
exceeding the maximum allowable run speed is detected.
See the Warranty at the back of this manual for warranty information.
LXL-TB-015BB
3
Page 12
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
32,000-RPM
56-Sector
(335456)
Preparation and Use
Preparation and Use
Specific information about the SW 32 Ti and SW 32.1 Ti rotors is given here. Information common to these
and other rotors is contained in Rotors and Tubes for Preparative Ultracentrifuges (publication LR-IM),
which should be used together with this manual for complete rotor and accessory operation. Publication
LR-IM is included in the literature package with this rotor manual.
NOTE
Although rotor components and accessories made by other manufacturers may fit in the SW 32 Ti and
SW 32.1 Ti rotors, their safety in these rotors cannot be ascertained by Beckman Coulter. Use of other
manufacturers’ components or accessories in these rotors may void the rotor warranty and should be
prohibited by your laboratory safety officer. Only the components and accessories listed in this
publication should be used in these rotors.
Prerun Safety Checks
Read the Safety Notice section at the front of this manual before using the rotor.
1
Make sure that the rotor, buckets, and caps are clean and show no signs of corrosion or
cracking.
2
Make sure that the rotor is equipped with the correct overspeed disk.
a. If the disk is missing or damaged, replace it according to the instructions in Rotors
and Tubes
.
3
Verify that the tubes and bottles being used are listed in Table 1 or Table 2.
4
Check the chemical compatibilities of all materials used.
•Refer to Chemical Resistances (publication IN-175), included in the Rotors and Tubes CD.
Rotor Preparation
For runs at other than room temperature refrigerate or warm the rotor beforehand for fast equilibration.
NOTE
4
Place the rotor on the rotor stand (332400) when it is not in the centrifuge. Take care to protect the
overspeed disk from damage when handling the rotor.
LXL-TB-015BB
Page 13
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
1
5
4
3
2
6
7
8
1
4
3
2
5
Preparation and Use
1
Install the rotor body on the drive hub.
a. Slowly turn the rotor to the right (clockwise) to make sure it is properly seated.
2
Load the filled containers into the buckets (see page 7 for tube and accessory information).
a. Complete loading by placing the correct floating spacers (if required) over the tubes.
3
Ensure that bucket gaskets are lightly but evenly coated with silicone vacuum grease.
a. Do not run a bucket without an O-ring, as the bucket will leak.
1. Ta b
2. Black Cap
3. O-ring (812715)
4. SW 32 Ti Bucket
5. Ta b
6. Red Cap
7. O-ring (812715)
8. SW 32.1 Ti Bucket
CAUTION
Use only black caps (369643) on black SW 32 Ti buckets and red caps (369645) on
red SW 32.1 Ti buckets.
4
Use a lint-free cotton swab to apply Spinkote™ lubricant (396812) to cap grooves in the
bucket tops.
a. Match bucket caps with numbered buckets.
b. Align the pins on each side of the cap with the guide slots in the bucket.
c. Twist the cap clockwise until it stops (one-quarter turn).
1. Cap Pins
2. Ta b
3. Bucket Top View
4. Guide Slots
5. This side toward outside of rotor
LXL-TB-015BB
5
Page 14
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Preparation and Use
5
Grasp the bucket cap tabs and lower the buckets into the openings on the rotor body with the
rounded sides toward the outside of the rotor.
Operation
NOTE
Six bucket assemblies must be installed, whether loaded or empty. If fewer than six tubes are being run,
they must be arranged symmetrically in the rotor (see Figure 1). Opposing tubes must be filled to
the same level with liquid of the same density.
Figure 1 Arranging Tubes Symmetrically in the Rotor Buckets
NOTE Two, three, four, or six tubes can be centrifuged per run if they are arranged in the rotor as shown. All
bucket assemblies must be attached to the rotor, whether loaded or empty.
A bucket will not seat in the rotor if it is inserted in the rotor with the rounded side toward the rotor
center. The bucket will fall through, spilling or disturbing the tube contents.
For low-temperature runs, precool the rotor in the centrifuge or in a refrigerator before use—especially
before short runs—to ensure that the rotor reaches the set temperature. A suggested precooling cycle is a
minimum of 30 minutes at 2000 RPM at the required temperature.
1
Refer to the centrifuge instruction manual for additional operating instructions.
2
For additional operating information, see the following:
•Run Times, page 12, for using k factors to adjust run durations.
•Run Speeds, page 13, for information about speed limitations.
•Selecting CsCl Gradients, page 19, for methods to avoid CsCl precipitation during
centrifugation.
6
LXL-TB-015BB
Page 15
Removal and Sample Recovery
1
CAUTION
If disassembly reveals evidence of leakage, you should assume that some fluid
escaped the rotor. Apply appropriate decontamination procedures to the
centrifuge and accessories.
1
Grasp the bucket cap tabs and lift up to remove the buckets.
• (Buckets may be removed without removing the rotor body from the ultracentrifuge.)
2
Remove the bucket caps by twisting counterclockwise and lifting up.
a. Use a tube removal tool (361668) or hemostat to remove the spacers and tubes.
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Preparation and Use
NOTE
3
To remove the rotor from the centrifuge, lift the rotor straight up and off the drive hub.
a. Set the rotor on the rotor stand.
If the conical-shaped adapters that support konical tubes are difficult to remove after
centrifugation, an extractor tool (354468) is available to facilitate removal.
Tubes and Accessories
The SW 32 Ti rotor uses tubes and accessories listed in Table 1; the SW 32.1 Ti rotor uses tubes and
accessories listed in Table 2. Be sure to use only those items listed, and to observe the maximum
speed limits shown. Refer to Appendix A in Rotors and Tubes for information on the chemical
resistances of tube and accessory materials.
1. Extractor Tool (354468)
While pressing the rubber tip against
the adapter wall, pull the tube and
adapter up and out of the cavity.
LXL-TB-015BB
7
Page 16
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Preparation and Use
Table 1 Beckman Coulter Tubes and Accessories for the SW 32 Ti Rotor
TubeRequired Accessory
Dimensions/
Nominal
Volume/
25 89 mm
38.5 mL
25 89 mm
38.5 mL
25 89 mm
31 mL
Description
Ultra Clear
open-top
polyallomer
open-top
thickwall
polyallomer
Part
Number
344058
(pkg/50)
326823
(pkg/50)
355642
(pkg/25)
Description
none—32,000 RPM
none—32,000 RPM
none—32,000 RPM
open-top
25 89 mm
31 mL
thickwall
polycarbonate
355631
(pkg/25)
none—32,000 RPM
open-top
a
Max Speed/
Part
Number
RCF/
k factor
175,000 g
204
175,000 g
204
175,000 g
198
175,000 g
202
25 83 mm
33.5 mL
25 89 mm
31.5 mL
25 83 mm
28 mL
25 76 mm
25.5 mL
25 64 mm
27 mL
25 77 mm
32.4 mL
25 38 mm
15 mL
polyallmer
Quick-Seal, bell-top
konical polyallomer
open-top
konical polyallomer
Quick-Seal,bell-top
konical polyallomer
open-top
polyallomer
Quick-Seal, bell-top
OptiSeal bell-top
d
polyallomer
Quick-Seal,
bell-top
344623
(pkg/50)
358126
(pkg/50)
358651
(pkg/50)
358125
(pkg/50)
343665
(pkg/50)
361625
(pkg/50)
343664
(pkg/50)
Noryl
spacer
b
floating
35553632,000 RPM
175,000 g
192
Hytrel
c
adapter
358156
(pkg/6)
32,000 RPM
175,000 g
199
adapter35815632,000 RPM
175,000 g
Noryl floating spacer355536
Hytrel adapter358156
(pkg/6)
198
32,000 RPM
175,000 g
156
Noryl floating spacer35553632,000 RPM
175,000 g
146
Ultem spacer
b
39283332,000 RPM
175,000 g
155
Noryl floating spacer35553632,000 RPM
175,000 g
81
8
LXL-TB-015BB
Page 17
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Preparation and Use
Table 1 Beckman Coulter Tubes and Accessories for the SW 32 Ti Rotor
TubeRequired Accessory
Dimensions/
Nominal
Volume/
25 38 mm
8.4 mL
Description
konical polyallomer
Quick-Seal, bell-top
Part
Number
358652
(pkg/50)
Description
Hytrel adapter358156
Noryl floating spacer355536
25 76 mm
22.5 mL
konical polyallomer
Quick-Seal, bell-top
358654
(pkg/50)
Hytrel adapter35815632,000 RPM
Noryl floating spacer355536
a. Use only the items listed here..
b. Noryl and Ultem are registered trademarks of GE Plastics.
c. Hytrel is a registered trademark of E.I. Du Pont de Nemours and Company.
d. Includes disposable plastic plugs.
Table 2 Beckman Coulter Tubes and Accessories for the SW 32.1 Ti Rotor
a
(Continued)
Number
a
Part
(pkg/6)
Max Speed/
RCF/
k factor
32,000 RPM
175,000 g
74
175,000 g
155
Dimensions/
Nominal
Volume/
16 102 mm
14.5 mL
16 102 mm
17 mL
16 102 mm
12.5 mL
16 96 mm
16.5 mL
16 93 mm
13.5 mL
TubeRequired Accessory
Part
Description
polyallomer
Quick-Seal,
Number
356291
(pkg/50)
Description
Noryl floating spacer35557932,000 RPM
bell-top
Ultra-Clear,
open-top
konical polyallomer
Quick-Seal bell-top
344061
(pkg/50)
358653
(pkg/50)
none—32,000 RPM
adapter35815532,000 RPM
Noryl floating spacer355579
polyallomer,
open-top
konical polyallomer
open-top
337986
(pkg/50)
358123
(pkg/50)
none—32,000 RPM
Hytrel adapter35815532,000 RPM
Part
Number
Max Speed/
RCF/
k factor
187,000 g
199
187,000 g
228
187,000 g
205
187,000 g
228
187,000 g
225
LXL-TB-015BB
9
Page 18
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
4°C
Preparation and Use
Table 2 Beckman Coulter Tubes and Accessories for the SW 32.1 Ti Rotora(Continued)
TubeRequired Accessory
Dimensions/
Nominal
Volume/
16 67 mm
10.5 mL
16 57 mm
8 mL
16 44 mm
6.5 mL
16 32 mm
4.5 mL
a. Use only the items listed here..
Description
polyallomer
Quick-Seal, bell-top
polyallomer
Quick-Seal, bell-top
polyallomer
Quick-Seal,
bell-top
polyallomer
Quick-Seal,
bell-top
Part
Number
344622
(pkg/50)
344621
(pkg/50)
345830
(pkg/50)
356562
(pkg/50)
Part
Description
Noryl floating spacer35557932,000 RPM
Noryl floating spacer35557932,000 RPM
Noryl floating spacer35557932,000 RPM
Noryl floating spacer35557932,000 RPM
Number
Max Speed/
RCF/
k factor
187,000 g
133
187,000 g
102
187,000 g
79
187,000 g
56
Temperature Limits
•Plastic tubes have been centrifuge tested for use at temperatures between 4 and 25°C. For
centrifugation at other temperatures, pretest tubes under anticipated run conditions.
•If plastic containers are frozen before use, make sure that they are thawed to at least 4°C prior
to centrifugation.
OptiSeal Tubes
OptiSeal™ tubes come with plastic plugs and can be quickly and easily prepared for use. With the
tube spacer in place, the g force during centrifugation ensures a tight, reliable seal that protects
your samples.
10
LXL-TB-015BB
Page 19
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
1
5
4
3
2
6
1
2
Preparation and Use
1
Place the tubes in the rack and fill each tube to the base of the stem, leaving no fluid in the stem.
•Overfilling the tube can cause spillage when the plug is inserted or can compromise seal
integrity.
•However, too much air can cause excessive tube deformation, disrupting gradients and
sample bands.
1. Spacer
2. Plug
3. Stem
4. Meniscus
5. Tu b e
6. Base of Stem
2
Refer to Using OptiSeal™ Tubes (publication IN-189), included in each box of tubes, for detailed
information on the use and care of OptiSeal tubes.
Quick Seal Tubes
Quick-Seal® tubes must be sealed prior to centrifugation. These tubes are heat sealed and do not
need caps; however, spacers are required on top of the tubes when they are loaded into the rotor
buckets.
1
Fill Quick-Seal tubes leaving a small bubble of air at the base of the neck.
a. Do not leave a large air space—too much air can cause excessive tube deformation.
2
Some of the tubes listed in Table 1 and Table 2 are part of the g-Max™ system, which uses a
combination of small bell-top Quick-Seal tubes and floating spacers (also called g-Max spacers).
•This means that you can run the shorter tubes listed in the Tables in the SW 32 Ti and
SW 32.1 T rotors without reduction in g force.
•For detailed information on the g-Max system see publication DS-709.
Refer to Rotors and Tubes for detailed information on the use and care of Quick-Seal tubes.
•Quick-Seal tubes are disposable and should be discarded after a single use.
konical™ Tubes
Polyallomer konical tubes, used to optimize pelleting separations, have a conical tip that
concentrates the pellet in the narrow end of the tube. The narrow bottom also reduces the tube’s
nominal volume and minimizes gradient material requirement. The konical tubes come in both
open-top and Quick-Seal tube designs. Conical cavity adapters hold the tubes in the rotor buckets
1. Adapters
Run Times
Polyallomer and Ultra-Clear Open-Top Tubes
Polyallomer and Ultra-Clear® open-top tubes should be filled as full as possible (2 or 3 mm from the
tube top) for tube support. If necessary, float mineral oil (or some other low-density, immiscible
liquid) on top of the tube contents to fill the tube to its maximum volume. (Do not use an oil overlay
in Ultra-Clear tubes.) All opposing tubes for a run must be filled to the same level with liquid of the
same density.
The k factor of the rotor is a measure of the rotor’s pelleting efficiency. (Beckman Coulter
has calculated the k factors for all of its preparative rotors at maximum rated speed and using
full tubes.) The k factor is calculated from the formula
EQ 1
where is the angular velocity of the rotor in radians per second ( = 0.105 RPM), r
maximum radius, and r
is the minimum radius.
min
After substitution:
max
is the
EQ 2
12
LXL-TB-015BB
Page 21
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
t
k
s
---=
k
adj
k
32 000
actual run speed
----------------------------------------
2
=
t
a
t
b
-----
k
a
k
b
------=
reduced maximum speed = 32,000 RPM)
1.2 g/mL
----------------------
Preparation and Use
Use the k factor in the following equation to estimate the run time t (in hours) required to pellet
particles of known sedimentation coefficient s (in Svedberg units, S).
EQ 3
Run times can be estimated for centrifugation at less than maximum speed by adjusting the k factor
as follows:
EQ 4
Run times can also be estimated from data established in prior experiments if the k factor of the
previous rotor is known. For any two rotors, a and b:
EQ 5
where the k factors have been adjusted for the actual run speed used.
Run Speeds
The centrifugal force at a given radius in a rotor is a function of speed. Comparisons of forces
between different rotors are made by comparing the rotors’ relative centrifugal fields (RCF). When
rotational speed is selected so that identical samples are subjected to the same RCF in two different
rotors, the samples are subjected to the same force. The RCF at a number of rotor speeds is provided
in Table 3.
Do not select rotational speeds in excess of 32,000 RPM. In addition, speeds must be reduced under
the following circumstances:
1. If nonprecipitating solutions more dense than 1.2 g/mL are centrifuged, reduce the maximum
2. Further speed limits must be imposed when CsCl or other self-forming-gradient salts are
allowable run speed according to the following equation:
EQ 6
where is he density of the tube contents. This speed reduction will protect the rotor from
excessive stresses due to the added tube load.
centrifuged, as equation (6) does not predict concentration limits/speeds that are required to
prevent precipitation of salt crystals. Solid CsCl has a density of 4 g/mL, and if precipitated
during centrifugation may cause rotor failure. Figure 2 through Figure 5, together with the
description and examples below, show how to reduce run speeds when using CsCl gradients.
LXL-TB-015BB
13
Page 22
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Preparation and Use
Rotor
Speed
(RPM)
5,000
500
a
(162.8 mm)
Relative Centrifugal Field (g)
At r
max
(113.6 mm)
187,000
164,000
114,000
73,000
41,000
18,200
4,560
46
Table 3 Relative Centrifugal Fields for the SW 32 Ti and SW 32.1 Ti Rotors
Relative Centrifugal Field (g)
Rotor
Speed
(RPM)
32,000
30,000
25,000
20,000
15,000
10,000
5,000
500
a. Entries in this table are calculated from the formula RCF = 1.12r (RPM/1000)2 and then rounded to three significant digits.
At r
max
(152.5 mm)
175,000
154,000
107,000
68,300
38,400
17,100
4,270
43
At r
av
(109.7 mm)
126,000
111,000
76,800
49,200
27,600
12,300
3,070
31
At r
min
(66.8 mm)
76,600
67,300
46,800
29,900
16,800
7,480
1,870
19
32,000
30,000
25,000
20,000
15,000
10,000
Relative Centrifugal Fields, SW 32 Ti Rotor
200,000
180,000
160,000
140,000
120,000
100,000
80,000
RCF (x g)
60,000
40,000
20,000
0
0500010,00015,00020,00025,00030,000
Speed (RPM)
32,000
At r
av
130,000
115,000
80,000
50,900
28,600
12,700
3,180
32
At r
(64.4 mm)
73,900
65,000
45,100
28,900
16,200
r
max
r
av
r
min
min
7,210
1,800
18
200,000
180,000
160,000
140,000
120,000
100,000
80,000
RCF (x g)
60,000
40,000
20,000
0
0 500010,00015,00020,00025,00030,000
14
Relative Centrifugal Fields, SW 32.1 Ti Rotor
Speed (RPM)
32,000
r
max
r
av
r
min
LXL-TB-015BB
Page 23
Figure 2 Precipitation Curves for the SW 32 Ti Rotor.r*
1.90
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Preparation and Use
1.80
1.70
1.60
1.50
Homogeneous CsCl Solution (g/mL)
1.40
1/4
1/2
3/4
full
1/4
1/2
3/4
full
1.30
1.20
1.10
0
* Using speed and density combinations that intersect on or below the solid curves ensures that CsCl will not precipitate
during centrifugation. Tube fill volumes are indicated on the curves.
LXL-TB-015BB
SW 32 Ti ROTOR
= 20°C
= 4°C
500010,00015,00020,00025,00030,000
Rotor Speed (RPM)
15
Page 24
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
1.20
1.10
1.00
1.30
1.40
1.50
1.60
1.70
1.80
1.90
Density (g/mL)
r
max
70.080.090.0100.0110.0120.0130.0140.0152.5
Distance from Axis of Rotation (mm)
r
min3/4-filled1/2-filled1/4-filled
66.8
SW 32 Ti ROTOR
= 20°C
= 4°C
20,000 RPM
20,000 RPM
25,000 RPM
25,000 RPM
30,000 RPM
30,000 RPM
32,000 RPM
32,000 RPM
Preparation and Use
Figure 3 CsCl Gradients at Equilibrium for the SW 32 Ti Rotor
*
* Centrifugation of homogeneous CsCl solutions at maximum allowable speeds (from Figure 2) results in gradients
presented here.
16
LXL-TB-015BB
Page 25
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Preparation and Use
Figure 4 Precipitation Curves for the SW 32.1 Ti Rotor
1.90
1.80
1.70
1.60
1.50
*
1/4
1/2
3/4
full
1/4
1/2
3/4
Homogeneous CsCl Solution (g/mL)
1.40
1.30
1.20
1.10
0
500010,00015,00020,00025,00030,000
full
SW 32.1 Ti ROTOR
= 20°C
= 4°C
Rotor Speed (RPM)
* Using speed and density combinations that intersect on or below the solid curves ensures that CsCl will not precipitate
during centrifugation. Tube fill volumes are indicated on the curves.
LXL-TB-015BB
17
Page 26
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
1.20
1.10
1.00
1.30
1.40
1.50
1.60
1.70
1.80
1.90
Density (g/mL)
r
max
70.080.090.0100.0110.0120.0130.0140.0150.0
Distance from Axis of Rotation (mm)
r
min
64.4162.8
SW 32.1 Ti ROTOR
= 20°C
= 4°C
20,000 RPM
20,000 RPM
25,000 RPM
30,000 RPM
30,000 RPM
32,000 RPM
32,000 RPM
25,000 RPM
3/4-filled1/2-filled1/4-filled
Preparation and Use
Figure 5 CsCl Gradients at Equilibrium for the SW 32.1 Ti
*
* Centrifugation of homogeneous CsCl solutions at maximum allowable speeds (from Figure 4) results in gradients
presented here.
18
LXL-TB-015BB
Page 27
Selecting CsCl Gradients
Rotor speed is used to control the slope of a CsCl density gradient, and must be limited to prevent
CsCl precipitation during centrifugation. Speed and density combinations that intersect on or
below the curves in Figure 2 (for the SW 32 T i rotor) a nd in Figure 4 (for the SW 32.1 Ti rotor) ensure
that CsCl will not precipitate during centrifugation in these rotors. Curves are provided at two
temperatures: 20°C (black curves) and 4°C (gray curves). Curves in Figure 2 through Figure 5 are
provided up to the maximum speed of the rotor.
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Preparation and Use
NOTE
The curves in Figure 2 through Figu re 5 are for solutions of CsCl salt dissolved in distilled water only. If
other salts are present in significant concentrations, the overall CsCl concentration may need to be
reduced.
The reference curves shown in Figure 3 and Figure 5 show gradient distribution at equilibrium.
Each curve inFigure 3 is within the density limits allowed for the SW 32 Ti rotor; each curve in
Figure 5 is within the density limits allowed for the SW 32.1 Ti rotor. Each curve was generated for
a single run speed using the maximum allowable homogeneous CsCl densities (one for each fill
level) that avoid precipitation at that speed. (The gradients in Figure 3 and Figure 5 can be
generated from step or linear gradients, or from homogeneous solutions. But the total amount of
CsC l i n solut io n must b e e quivale nt to a homo ge neous solution corresponding to the concentrations
specified in Figure 3 and Figure 5.) Figure 3 and Figure 5 can also be used to approximate
the banding positions of sample particles. Curves not shown may be interpolated.
Adjusting Fill Volumes
Figure 2 through Figure 5 show that several fill volumes are possible in a tube. If a thinwall tube is
partially filled with gradient solution, float mineral oil (or some other low-density, immiscible
liquid) on top of the tube contents to fill the tube to its maximum volume. (Do not use an oil overlay
in Ultra-Clear tubes.) Note that for a given CsCl density, as the fill level decreases the maximum
allowable speed increases. Partial filling may be desirable when there is little sample or when you
wish to shorten the run time
For example, in the SW 32 Ti rotor, a quarter-filled tube of 1.69-g/mL homogeneous CsCl solution at
4°C may be centrifuged at 25,000 RPM (see Figure 2). The segment of the 25,000 RPM curve (Figure 3)
from the quarter-filled line to r
a half-filled tube may be centrifuged no faster than 17,000 RPM, and 15,000 RPM in a three-quarter-filled tube. A tube full of the 1.69-g/mL CsCl solution may be centrifuged no faster than 13,500 RPM.
Curves not shown in the figures may be interpolated
LXL-TB-015BB
(the tube bottom) represents this gradient. The same solution in
max
19
Page 28
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
r
min
r
max
1
54
3
2
6
7
V = r2h
Preparation and Use
Typical Examples for Determining CsCl Run Parameters
Example A:
Starting with a homogeneous CsCl solution density of 1.40 g/mL and approximate particle buoyant
densities of 1.38 and 1.42 g/mL, at 20°C, where will particles band at equilibrium in the SW 32 Ti
rotor?
1. At Speed
2. At Rest in Rotor
3. At Rest Outside Rotor
4. Floating Components
5. Bands
6. Pelleted Material
7. Pathlength
1
In Figure 2, find the curve that corresponds to the required run temperature (20°C) and fill
volume (three-quarters full).
•The maximum allowable rotor speed is determined from the point where this curve
intersects the homogeneous CsCl density (28,000 RPM).
2
In Figure 3, sketch a horizontal line corresponding to each particle’s buoyant density.
3
Mark the point in Figure 3 where each particle density intersects the curve corresponding to
the selected run speed and temperature.
•Particles will band at these locations across the tube diameter at equilibrium during
centrifugation.
In this example, particles will band about 120 and 125 mm from the axis of rotation, about 5 mm of
centerband-to-centerband separation.
To determine interband volume in milliliters, use the following equation:
EQ 7
where r is the tube radius in centimeters and h is the interband separation in centimeters
Example B:
Knowing particle buoyant densities (for example, 1.55 and 1.50 g/mL), how do you achieve good
separation in the SW 32.1 Ti rotor?
1
In Figure 5, sketch in a horizontal line corresponding to each particle’s buoyant density.
20
LXL-TB-015BB
Page 29
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
1
Care and Maintenance
2
Select the curve at the desired temperature (20°C) and tube volume (full) that gives the best
particle separation.
3
Note the run speed along the selected curve (20,000 RPM).
4
From Figure 2, select the maximum homogeneous CsCl density (in this case, 1.56 g/mL) that
corresponds to the temperature and run speed established above.
•These parameters will provide the particle-banding pattern selected in Step 2.
In this example, particles will band about 119.5 and 129 mm from the axis of rotation (about
9.5 mm apart).
Care and Maintenance
Maintenance
NOTE Do not use sharp tools on the rotor that could cause scratches in the rotor surface. Corrosion begins
in scratches and may open fissures in the rotor with continued use.
1
Frequently check the bucket O-rings for signs of wear.
a. Replace O-rings every 6 months, or whenever worn or damaged.
b. Use the hooked removal tool (978354) to remove O-rings.
c. Keep the O-rings lightly coated with silicone vacuum grease (335148).
2
Regularly inspect the rotor body, buckets, and caps for cracks, pitting, or heavy discoloration.
NOTE
Wear will become visible over time on the contact areas between buckets and rotor body. Such
wear will not affect rotor operation.
LXL-TB-015BB
1. Contact Area
21
Page 30
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Care and Maintenance
3
Frequently lubricate the bucket and cap mating surfaces with a thin, even coat of Spinkote
lubricant (306812).
4
Refer to Appendix A in Rotors and Tubes for the chemical resistances of rotor and accessory
materials.
•Your Beckman Coulter representative provides contact with the Field Rotor Inspection
Program and the rotor repair center.
Cleaning
Wash the rotor and rotor components immediately if salts or other corrosive materials are used or if
spillage has occurred. Do not allow corrosive materials to dry on the rotor.
Under normal use, wash the rotor frequently (at least weekly) to prevent buildup of residues.
1
Wash the rotor buckets, O-rings, and caps in a mild detergent, such as Beckman Solution 555™,
that won’t damage the rotor.
a. Dilute the detergent 10 to 1 with water.
•The Rotor Cleaning Kit contains two plastic-coated brushes and two quarts of Solution 555
(339555) for use with rotors and accessories.
2
Rinse the cleaned rotor and components with distilled water.
3
Air-dry the rotor and buckets upside down. Do not use acetone to dry the rotor.
4
Air-dry the rotor and lid upside down.
a. Do not use acetone to dry the rotor.
5
Clean metal threads frequently to prevent buildup of residues and ensure adequate closure.
a. Use a brush and concentrated Solution 555.
b. Rinse and dry thoroughly, then lubricate lightly but evenly with Spinkote to coat all
threads.
22
LXL-TB-015BB
Page 31
Decontamination
If the rotor or other components are contaminated with toxic, radioactive, or pathogenic materials,
follow appropriate decontamination procedures as outlined by your laboratory safety officer. Refer
to Appendix A in Rotors and Tubes to select solutions that will not damage the rotor and accessory
materials.
Sterilization and Disinfection
•The rotor and all rotor components, except those made of Noryl, can be autoclaved at 121°C for
up to an hour. Remove the plugs from the rotor and place the rotor, plugs, and spacers in the
autoclave upside down.
•Ethanol (70%)
those made of plastic. Bleach (sodium hypochlorite) may be used, but may cause discoloration
of anodized surfaces. Use the minimum immersion time for each solution, per laboratory
standards.
*
or hydrogen peroxide (6%) may be used on all rotor components, including
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Returning a Rotor
While Beckman Coulter has tested these methods and found that they do not damage the rotor or
components, no guarantee of sterility or disinfection is expressed or implied. When sterilization or
disinfection is a concern, consult your laboratory safety officer regarding proper methods to use.
Refer to publication IN-192 (included with each box of tubes) for tube sterilization and disinfection
procedures. Quick-Seal, Ultra Clear, and thinwall open-top tubes are disposable and should be discarded
after a single use.
Storage
When it is not in use, store the rotor and buckets in a dry environment (not in the instrument).
Remove the bucket caps to allow air circulation so that moisture will not collect in the buckets.
Returning a Rotor
Before returning a rotor or accessory for any reason, prior permission must be obtained from
Beckman Coulter, Inc. This form may be obtained from your local Beckman Coulter sales office. The
form, entitled Returned Material Authorization (RMA) for United States returns or Returned Goods Authorization (RGA) for international returns, should contain the following information:
•rotor type and serial number,
•history of use (approximate frequency of use),
•reason for the return,
* Flammability hazard. Do not use in or near operating ultracentrifuges.
LXL-TB-015BB
23
Page 32
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
Supply List
•original purchase order number, billing number, and shipping number, if possible,
•name and email address of the person to be notified upon receipt of the rotor or accessory at
the factory,
•name and email address of the person to be notified about repair costs, etc.
To protect our personnel, it is the customer’s responsibility to ensure that all parts are free from
pathogens and/or radioactivity. Sterilization and decontamination must be done before returning
the parts. Smaller items (such as tubes, bottles, etc.) should be enclosed in a sealed plastic bag.
All parts must be accompanied by a note, plainly visible on the outside of the box or bag, stating that they
are safe to handle and that they are not contaminated with pathogens or radioactivity. Failure to attach
this notification will result in return or disposal of the items without review of the reported problem.
Use the address label printed on the RMA/RGA form when mailing the rotor and/or accessories.
Customers located outside the United States should contact their local Beckman Coulter office.
Supply List
NOTE Publications referenced in this manual can be obtained at www.beckmancoulter.com, by
calling Beckman Coulter at 1-800-742-2345 in the United States, or by contacting your local
Beckman Coulter office.
See the Beckman Coulter Ultracentrifuge Rotors, Tubes & Accessories catalog (BR-8101, available at
www.beckmancoulter.com) or contact Beckman Coulter Sales (1-800-742-2345 in the United States)
for detailed information on ordering parts and supplies. For your convenience, a partial list is given
below.
Replacement Rotor Parts
DescriptionPart Number
SW 32 Ti rotor assembly369650
SW 32 Ti buckets (set of 6, black, with caps and O-rings)369647
SW 32 Ti bucket O-ring812715
SW 32 Ti cap (black)369643
SW 32.1 Ti rotor assembly369651
SW 32.1 Ti buckets (set of 6, red, with caps and O-rings)369648
SW 32.1 Ti bucket O-ring812715
SW 32.1 Ti cap (red)369645
Rotor stand332400
Overspeed disk (32,000 RPM)335456
24
LXL-TB-015BB
Page 33
Other
SW 32 Ti and SW 32.1 Ti Swinging-Bucket Rotors
NOTE For MSDS information, go to the Beckman Coulter website at www.beckmancoulter.com.
All Beckman Coulter ultracentrifuge Fixed Angle, Vertical Tube, Near Vertical Tube, Swinging Bucket, and
Airfuge rotors are warranted against defects in materials or workmanship for the time periods indicated
below, subject to the Warranty Conditions stated below.
For Zonal, Continuous Flow, Component Test, and Rock Core Ultracentrifuge Rotors, see separate warranty.
Warranty Conditions (as applicable)
1. This warranty is valid for the time periods indicated above from the date of shipment to the original
Buyer by Beckman Coulter or an authorized Beckman Coulter representative.
2. This warranty extends only to the original Buyer and may not be assigned or extended to a third person
without written consent of Beckman Coulter.
3. This warranty covers the Beckman Coulter Centrifuge Systems only (including but not limited to the
centrifuge, rotor, and accessories) and Beckman Coulter shall not be liable for damage to or loss of the
user’s sample, non-Beckman Coulter tubes, adapters, or other rotor contents.
4. This warranty is void if the Beckman Coulter Centrifuge System is determined by Beckman Coulter to
have been operated or maintained in a manner contrary to the instructions in the operator’s manual(s)
for the Beckman Coulter Centrifuge System components in use. This includes but is not limited to
operator misuse, abuse, or negligence regarding indicated maintenance procedures, centrifuge and rotor
classification requirements, proper speed reduction for the high density of certain fluids, tubes, and tube
caps, speed reduction for precipitating gradient materials, and speed reduction for high-temperature
operation.
5. Rotor bucket sets purchased concurrently with or subsequent to the purchase of a Swinging Bucket Rotor
are warranted only for a term co-extensive with that of the rotor for which the bucket sets are purchased.
6. This warranty does not cover the failure of a Beckman Coulter rotor in a centrifuge not of
Beckman Coulter manufacture, or if the rotor is used in a Beckman Coulter centrifuge that has been
modified without the written permission of Beckman Coulter, or is used with carriers, buckets, belts, or
other devices not of Beckman Coulter manufacture.
7. Rotor parts subject to wear, including but not limited to rotor O-rings, VTi, NVT™, TLV, MLN, and TLN
rotor tube cavity plugs and gaskets, tubing, tools, optical overspeed disks, bearings, seals, and lubrication
are excluded from this warranty and should be frequently inspected and replaced if they become worn
or damaged.
8. Keeping a rotor log is not mandatory, but may be desirable for maintenance of good laboratory practices.
Repair and Replacement Policies
1. If a Beckman Coulter rotor is determined by Beckman Coulter to be defective, Beckman Coulter will
repair or replace it, subject to the Warranty Conditions. A replacement rotor will be warranted for the
time remaining on the original rotor’s warranty.
2. If a Beckman Coulter centrifuge is damaged due to a failure of a rotor covered by this warranty, Beckman
Coulter will supply free of charge (i) all centrifuge parts required for repair (except the drive unit, which
will be replaced at the then current price less a credit determined by the total number of revolutions or
LXL-TB-015BB
Warranty-1
Page 36
years completed, provided that such a unit was manufactured or rebuilt by Beckman Coulter), and (ii) if
the centrifuge is currently covered by a Beckman Coulter warranty or Full Service Agreement, all labor
necessary for repair of the centrifuge.
3. If a Beckman Coulter rotor covered by this warranty is damaged due to a malfunction of a
Beckman Coulter ultracentrifuge covered by an Ultracentrifuge System Service Agreement,
Beckman Coulter will repair or replace the rotor free of charge.
4. If a Beckman Coulter rotor covered by this warranty is damaged due to a failure of a Beckman Coulter
tube, bottle, tube cap, spacer, or adapter, covered under the Conditions of this Warranty, Beckman
Coulter will repair or replace the rotor and repair the instrument as per the conditions in policy point (2)
above, and the replacement policy.
5. Damage to a Beckman Coulter rotor or instrument due to the failure or malfunction of a non-Beckman
Coulter tube, bottle, tube cap, spacer, or adapter is not covered under this warranty, although
Beckman Coulter will assist in seeking compensation under the manufacturer’s warranty.
Disclaimer
IT IS EXPRESSLY AGREED THAT THE ABOVE WARRANTY SHALL BE IN LIEU OF ALL WARRANTIES OF FITNESS
AND OF THE WARRANTY OF MERCHANTABILITY AND BECKMAN COULTER, INC. SHALL HAVE NO LIABILITY
FOR SPECIAL OR CONSEQUENTIAL DAMAGES OF ANY KIND WHATSOEVER ARISING OUT OF THE
MANUFACTURE, USE, SALE, HANDLING, REPAIR, MAINTENANCE, OR REPLACEMENT OF THE PRODUCT.
Factory Rotor Inspection Service
Beckman Coulter, Inc., will provide free mechanical and metallurgical inspection in Indianapolis, Indiana,
USA, of any Beckman Coulter rotor at the request of the user. (Shipping charges to Beckman Coulter are the
responsibility of the user.) Rotors will be inspected in the user’s laboratory if the centrifuge in which they are
used is covered by an appropriate Beckman Coulter Service Agreement. Contact your local Beckman Coulter
office for details of service coverage or cost.
Before shipping, contact the nearest Beckman Coulter Sales and Service office and request a Returned Goods
Authorization (RGA) form and packaging instructions. Please include the complete rotor assembly, with
buckets, lid, handle, tube cavity caps, etc. A SIGNED STATEMENT THAT THE ROTOR AND ACCESSORIES ARE
NON-RADIOACTIVE, NON-PATHOGENIC, NON-TOXIC, AND OTHERWISE SAFE TO SHIP AND HANDLE IS
REQUIRED.
Warranty-2
LXL-TB-015BB
Page 37
Page 38
www.beckmancoulter.com
Related Documents
Rotors and Tubes for Preparative
Ultracentrifuges (LR-IM)
•Rotors
•Tubes, Bottles, and Accessories
•Using Tubes, Bottles, and Accessories
•Using Fixed-Angle Rotors
•Using Swinging-Bucket Rotors
•Using Vertical-Tube and Near-Vertical Tube
Rotors
•Care and Maintenance
•Chemical Resistances for Beckman Coulter
Centrifugation Products
•Use of the w2t Integrator
•The Use of Cesium Chloride Curves
•Gradient Materials
•References
•Glossary
Available in hard copy or electronic pdf by
request.