Bio-Rad Mini-PROTEAN II Multiscreen Apparatus User Manual

Mini-PR OTEAN®II

Multiscreen Apparatus

Instruction Manual

Catalog number

170-4017

For Technical Service Call Your Local Bio-Rad Office or in the U.S. Call 1-800-4BIORAD (1-800-424-6723)

Table of Contents

Page

Section 1 Introduction .............................................................................................1

1.1 Specifications ........................................................................................................1

Section 2 Equipment and Reagents........................................................................1

Section 3 Special Handling Features......................................................................3

3.1 Chemical Stability.................................................................................................3

Section 4 Multiscreen Assembly Procedure..........................................................3

4.1 Preparation for the Immunoassay in the Multiscreen Apparatus.........................3

4.2 Assembly of the Multiscreen Apparatus...............................................................3

4.3 Sample Loading and Washing ..............................................................................5

4.4 Color Development of Enzyme Conjugates.........................................................7

4.5 Detection with Colloidal Gold Conjugates...........................................................8

Section 5 Solution for Immunoassay Applications...............................................8

Section 6 References.................................................................................................9

Section 1
Introduction

With the Mini-PROTEAN II multiscreen apparatus you can quickly and easily screen up to
40 different antibody or serum samples on Western blots, without having to cut the membranes into
strips. Only 600 µl of sample is used per channel, eliminating waste of precious antibody. Two indi­vidual and independent sample templates allow screening of either one or two mini blots.

The multiscreen apparatus is simple to operate. Electrophorese an antigen sample on an SDS­PAGE mini gel using the Mini-PROTEAN II cell, and blot it onto nitrocellulose or Zeta-Probe

®

membrane with the Mini Trans-Blot®, Trans-Blot, or Trans-Blot SD cell. After blocking the unre­acted sites, clamp the membrane between the gasket and sample template. The assembly is held
together with four screws, and the rubber sealing gasket prevents any well-to-well leakage. Pipet
serum or antibody samples into each of the channels for incubation with the anitgen. Wash solu­tions can be easily introduced with the Eppendorf®Repeater™pipet, and are rapidly removed by
vacuum aspiration. The Multiscreen apparatus is compatible with all common Western blotting
procedures.

1.1 Specifications

Materials

Multiscreen apparatus Acrylic plastic
Multiscreen gasket Silicone rubber
Shipping weight 1.4 kg
Overall size 11 x 27 x 6 cm (W x L x H)
Membrane size 7 x 8.4 cm
Channel dimensions 2.5 mm x 5.2 cm x 5 mm (W x L x H)
Channels per sample template 20

Section 2
Equipment and Reagents

Catalog Number Product Description

170-4017 Mini-PROTEAN II Multiscreen Apparatus, includes Multiscreen

sample templates, 2 Gaskets and Base Plate

170-4018 Mini-PROTEAN II Multiscreen Gaskets, 2

Mini-Protean II Cell

165-2940 Mini-PROTEAN II Cell, includes 10 well combs, 0.75 mm

spacers (4), Electrode Core with Gaskets, lower buffer
chamber, lid with cables, 3 sets Glass Plates, Clamp
Assemblies (2), Casting Stand with Gaskets, leveling bubble,
and instructions

Transfer Cells

170-3930 Mini Trans-Blot Electrophoretic Transfer Cell
170-3935 Mini Trans-Blot Module
170-3946 Trans-Blot Electrophoretic Transfer Cell, with plate electrodes
170-3910 Trans-Blot Electrophoretic Transfer Cell, with standard electrodes
170-3940 Trans-Blot SD Semi-Dry Electrophoretic Transfer Cell

1

Catalog Number Product Description

Power Supplies

165-5052 PowerPac 200 Power Supply, 100/120 V
165-5053 PowerPac 200 Power Supply, 220/240 V

Related Instruments

170-6545 Bio-Dot

®

Microfiltration Apparatus

170-6542 Bio-Dot SF Microfiltration Apparatus

Blotting Media
Nitrocellulose Membrane (0.45 micron)

162-0115 Nitrocellulose Membrane, roll, 33 cm x 3 m, 1
162-0113 Nitrocellulose Membrane, sheets, 20 x 20 cm, 5
162-0116 Nitrocellulose Membrane, sheets, 15 x 15 cm, 10
162-0114 Nitrocellulose Membrane, sheets, 15 x 9.2 cm, 10
162-0117 Nitrocellulose Membrane, sheets, 9 x 12 cm, 10
162-0145 Nitrocellulose Membrane, sheets, 7 x 8.4 cm, 10

Nitrocellulose Membrane (0.2 micron)

162-0112 Nitrocellulose Membrane, roll, 33 cm x 3 cm, 1
162-0146 Nitrocellulose Membrane, sheets, 7 x 8.4 cm, 10
162-0147 Nitrocellulose Membrane, sheets, 13.5 x 16.5 cm, 10

Immun-Blot

®

Assay Kits

Bio-Rad's Immun-Blot assay kits contain the necessary components and instructions for
performing immune detection assays on blotted membranes.

170-6460 Immun-Blot Assay Kit - Goat Anti-Rabbit IgG (H+L)

AP Conjugate

170-6461 Immun-Blot Assay Kit - Goat Anti-Mouse IgG (H+L)

AP Conjugate

170-6462 Immun-Blot Assay Kit - Goat Anti-Human IgG (H+L)

AP Conjugate

170-6463 Immun-Blot Assay Kit - Goat Anti-Rabbit IgG (H+L)

HRP Conjugate

170-6464 Immun-Blot Assay Kit - Goat Anti-Mouse IgG (H+L)

HRP Conjugate

170-6465 Immun-Blot Assay Kit - Goat Anti-Human IgG (H+L)

HRP Conjugate
170-6466 Immun-Blot Assay Kit - Protein A HRP
170-6467 Immun-Blot Assay Kit - Protein G HRP

Total Protein Detection Kits

170-6512 Biotin-Blot Protein Detection Kit
170-6517 Enhanced Colloidal Gold Total Protein Detection Kit

Blotting Standards

161-0305 Prestained SDS-PAGE Standards, Low Range
161-0309 Prestained SDS-PAGE Standards, High Range
161-0318 Prestained SDS-PAGE Standards, Broad Range
161-0307 Biotinylated SDS-PAGE Standards Kit, Low Range, HRP
161-0308 Biotinylated SDS-PAGE Standards Kit, Low Range, AP
161-0312 Biotinylated SDS-PAGE Standards Kit, High Range, HRP
161-0313 Biotinylated SDS-PAGE Standards Kit, High Range, AP
161-0321 Biotinylated SDS-PAGE Standards Kit, Broad Range, HRP
161-0322 Biotinylated SDS-PAGE Standards Kit, Broad Range, AP

2

Section 3
Special Handling Features

The multiscreen apparatus can be cleaned with a mild, non-abrasive detergent but not be
autoclaved. Do not subject the unit to temperatures greater than 50 °C, as this will warp acrylic
plates. If the unit becomes warped, it will no longer provide a proper seal. Heating the appa­ratus to >50 °C voids all warranties.

3.1 Chemical Stability

Chemicals compatible with acrylic plastic:

hydrochloric acid < 50% ethanol
sodium hydroxide < 50% ethanol

Chemicals that will attack acrylic plastic:

all polar aromatic solvents or chlorinated hydrocarbons, esters, and ketones
glacial acetic acid
chromic acid
trichloroacetic acid
> 50% ethanol
> 50% methanol

Section 4
Multiscreen Operating Procedure

4.1 Preparation for the Immunoassay in the Multiscreen Apparatus

1. Electrophorese the antigen sample into a mini gel following the instructions provided

with the Mini-PROTEAN II cell. The maximum length of the separating gel should not

exceed 5.2 cm, the length of the channels on the multiscreen sample template. The stack-

ing gel should be cast with the Mini-PROTEAN II preparative comb. This comb con-

tains one large sample well and one reference well.

2. Blot the gel to nitrocellulose or Zeta-Probe membrane, using a 7 x 8.4 cm membrane

size. Refer to the Mini Trans-Blot, Trans-Blot or Trans-Blot SD cell instruction manual

for electrophoretic transfer procedures.

3. Following the transfer, mark the outline of the gel on the membrane using a pen or pen-

cil. This will aid in aligning the blot with the sample template. Block the unreacted sites

on the blot with a blocking solution, 1 hour at room temperature for nitrocellulose, 2

hours at room temperature for Zeta-Probe membrane. Rinse the blocked blot in TBS

before applying to the multiscreen apparatus. See Section 5 for buffer formulations.

Note: Always use forceps or wear gloves when handling membranes.

4.2 Assembly of the Multiscreen Apparatus

1. Clean and dry the multiscreen apparatus and gaskets prior to assembly.

Note: Do not heat the apparatus to temperatures greater than 50 °C. This will cause the

unit to warp.

2. Place the sealing gasket onto the base plate with the raised surface down, using the guide

pins to help align the gasket.

3

Fig. 1. Assembly of the multiscreen apparatus.

3. Lay the blocked blot on the gasket with the antigen side facing up. Center the membrane

so that the channels of the sample template cover the length of the blotted sample.

4. Place the sample template on top of the membrane. The guide pins insure that the template

will be properly aligned. Finger tighten the four screws. When tightening the screws, use

a diagonal crossing pattern to insure even pressure on the membrane surface (see Figure

2). The multiscreen apparatus is ready for sample application.

Note: Use of excessive force when tightening the screws is not necessary to prevent well-

to-well leakage. Finger tightening is sufficient to obtain a good seal. Overtightening can

cause the channels to cut into the membrane.

4

2

4

6

8

10

12

14

16

18

20

2

4

6

8

10

12

14

16

18

20

MINI PROTEAN II

MULTISCREEN

MINI PROTEAN II

MULTISCREEN

Fig. 2. Diagonal crossing pattern for tightening screws in the multiscreen apparatus.

4.3 Sample Loading and Washing

Detailed instructions for performing immunoassays, including a comprehensive trou­bleshooting guide, can be found in any of the Immun-Blot assay instruction manuals. See
page 2 for a complete listing of Immun-Blot assay kits available from Bio-Rad.

1. To load an antibody or serum sample, tilt the multiscreen apparatus toward you so that the

back of the unit is tilted up ~30° (see Figure 3). Using a syringe or Eppendorf pipet, load

the solution into the bottom unmarked holes of the channels. Slow, careful delivery of

sample is necessary to avoid trapping bubbles inside the channels. Titling the apparatus

helps the bubbles rise to the top, towards the numbered holes of the channels. Fill the

channel with 600 µl antibody solution.

Note: Antibody buffers containing BSA or BLOTTO* are recommended for use with

the multiscreen apparatus. Do not use antibody buffers with gelatin, as this may cause

coagulation of gelatin within the channels of the unit.

* BLOTTO is an acronym for Bovine Lacto Transfer Technique Optimizer, and refers

to non-fat dry milk.

1,2

5

13

42

Fig. 3. Tilt the multiscreen apparatus toward you during sample application.

2. Wash solutions can be applied in the same manner as the antibody samples, or with the

Eppendorf repeater pipet. Use 600 µl per channel. The number and stringency of wash-

es may vary and should be determined separately for each experiment. However, a min-

imum of three washes with a buffer containing a detergent such as Tween-20 is

recommended after each antibody incubation. See Section 5 for buffer formulations.

6

Fig. 4. Vacuum aspiration of sample and wash solutions.

3. Antibody samples and wash solutions can be rapidly removed by vacuum aspiration. The

tubing from the vacuum source should be attached to the bottom, unmarked row of holes.

Move the tubing back and forth along the row of holes until all the channels are dry (see

Figure 4). To save an antibody or serum sample after incubation, remove the solution

individually from the channel with a pipet or syringe.

7

4.4 Color Development of Enzyme Conjugates

Incubation of the blot with antibodies conjugated to enzymes, such as horseradish per­oxidase or alkaline phosphatase, can be conducted either in the multiscreen apparatus or in a
separate vessel. If this step is carried out in the unit, wash the blot in the apparatus after the
second antibody incubation as outlined in Section 4.3.

1. Color development of enzyme conjugated antibodies should be performed in a separate

container to prevent permanent discoloration of the multiscreen apparatus. Remove the

membrane by loosening the four screws. Lift out the sample template and move the mem-

brane to a color development vessel.

2. Wash the membrane once with TBS for 5 minutes. After the color development solution

has been prepared, incubate the membrane in the solution. Gently agitate the solution

until development is complete. Remove the solution and rinse the membrane several

times in distilled water to stop the reaction. Air dry the blot on filter paper.

4.5 Detection with Colloidal Gold Conjugates

Incubation of the blot with colloidal gold conjugated antibodies, protein A, or protein G,
should be conducted in a separate vessel to prevent discoloration of the multiscreen apparatus.

1. Remove the blot from the multiscreen apparatus after washing to remove excess first

antibody. Place the membrane in a color development vessel.

2. Wash the membrane once with TBS for 5 minutes. Add the gold solution to the vessel until

the membrane is completely covered. Gently agitate the solution. Red bands identifying

antigen will appear on the membrane surface within 10–15 minutes at the sites of high-

est antigen concentrations. Allow the incubation to continue until the desired sensitivity

is achieved.

Section 5
Solutions for Immunoassay Applications

Tris Buffered Saline, 1 x TBS, 2 L

20 mM Tris-HCl, 500 mM NaCl, pH 7.5

Dissolve 4.84 g Tris, 58.48 g NaCl in ~1.5 L distilled, deionized H2O. Adjust to pH 7.5

with HCl. Adjust the volume to 2 L with dd H2O.

Note: Bio-Rad's Premixed Tris-Buffered Saline (catalog number 170-6430) eliminates

weighing of buffer components. One bottle produces 1 L of 10 x TBS.

Tween-20 Wash Solution, 1X TTBS, 1 L

20 mM Tris-HCl, 500 mM NaCl, 0.05% Tween-20, pH 7.5

Add 0.5 ml Tween-20 to 1 L of TBS.

Blocking Solution, 100 ml

Both of the following blocking solutions can be used with nitrocellulose. The solutions

containing BLOTTO should be used with Zeta-Probe membrane. Incubate nitrocellulose

blots for 1 hour at room temperature. Zeta-Probe membrane should be blocked for 2 hours

at room temperature.

3% Gelatin - TBS

Add 3.0 g gelatin to 100 ml TBS. Heat to 50 °C, stirring until dissolved. A microwave

oven will quickly solubilize the gelatin, but do not heat above 65 °C.

8

OR:

5% BLOTTO in 100 ml of TBS

Add 5% g of BLOTTO to 100 ml of TBS.

Antibody Buffer, 200 ml

1% BSA - TTBS

Add 2 g BSA to 200 ml TTBS. Stir to dissolve.

OR

1% BLOTTO in TTBS.

Add 2 g of BLOTTO to 200 ml of TTBS.

First Antibody Solution

Dilute antigen specific primary antibody to the appropriate titer in antibody buffer.

Second Antibody Solution, 100 ml

Dilute species specific Bio-Rad second antibody enzyme conjugate, 1:3,000 by adding
33 µl of conjugate to 100 ml of antibody buffer.

Consult the Immun-Blot assay kit instruction manual for dilution protocols of the col­loidal gold conjugates.

Color Development Solution

The specific chemicals and buffers are dependent on the enzyme conjugate being used.

See the Immun-Blot assay kit instruction manual for details on how to make the appro-

priate solution.

Section 6
References

1. Jerome, J. F. and Jaehning, J. A., Mol. and Cell Bio., 6, 1633 (1986).

2. Johnson, D. A., et. al., Gene Anal. Tech., 1, 3 (1984).

Eppendorf is a trademark of Eppendorf Geratebau Netheler & Hinz, GmbH

9

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SIG 020996 Printed in USA

M1704017 Rev B