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        SDS-PAGE PROTOCOL and WESTERN BLOT

        互联网

        1896

        Adapted from Current Protocols, Ch. 10
        Veena Mandava

        Materials
        To Pour Gels:
        30% acrylamide
        10% SDS
        10% APS (make fresh each time)
        TEMED
        1.5 M Tris , pH 8.8 (resolving gel)
        1.0 M Tris , pH 6.8 (stacking gel)
        5x SDS Running Buffer (1 L)
        Tris 15 g
        Glycine 72 g
        SDS 5 g
        Coomassie Blue Stain
        10% (v/v) acetic acid
        0.006% (w/v) Coomassie Blue dye
        90% ddH 2 O
        Isopropanol Fixing Solution
        10% (v/v) acetic acid
        25% (v/v) isopropanol
        65% ddH 2 O
        SDS sample loading buffer (40 ml)
        ddH 2 O 16 ml
        0.5 M Tris, pH 6.8 5 ml
        50% Glycerol 8 ml
        10% SDS 8 ml
        2-βmercaptoethanol 2 ml (add immediately before use)
        bromophenol blue
        10% (v/v) acetic acid

        Protocol
        1. Prepare polyacrylamide gel according to standard protocol.
        2. Load samples and run gel @ 25 mA (2 gels run @ 50 mA) in 1x SDS Running Buffer.
        3. At this point, the gel can either be transferred to a membrane (see Western protocol) or stained with Coomassie (see below).
        4. Place gel in a plastic container. Cover with isopropanol fixing solution and shake at room temperature. For 0.75 mm-thick gels, shake 10 to 15 min; for 1.5 mmthick gels, shake 30 to 60 min.
        5. Pour off fixing solution. Cover with Coomassie blue staining solution and shake at RT for 2 hr.
        6. Pour off staining solution. Wash gel with 10% acetic acid to destain, shaking at RT ON.

        WESTERN BLOT
        Adapted from protocol accompanying Hybond ECL Membrane
        Materials
        Transfer Buffer
        1x SDS Running Buffer in 20% Methanol
        1x PBS/0.1% Tween 20
        Blotting buffer, store at 4 ºC
        5% milk in 1x PBS/0.1% Tween 20

        Protocol
        1. Run SDS-PAGE.
        2. Wet membrane in H2O. Soak membrane in transfer buffer for 10 min.
        3. Set up transfer from the gel to a nylon membrane in transfer buffer.
        4. Place “transfer sandwich” in semi-dry transfer chamber. Run at 23 V for 30 min for 0.75 and 1.0 mm gels or 40 min for 1.5 mm gel.
        5. Block blot by soaking in blotting buffer for 1 hr with shaking. Alternatively,blocking can be done with as much as 10% milk and 0.5% Tween 20 to reduce background.
        6. To 10 ml blocking solution, add primary antibody at proper dilution. Incubate the membrane for 1 hr with shaking. Alternatively, incubation with 1º Ab can be done ON @ 4 ºC,
        7. Wash 2x briefly with PBS-T, then wash 3x with PBS-T for 5 min.
        8. To 10 ml PBS-T, add secondary antibody at proper dilution. Incubate the membrane for 1 hr with shaking.
        9. Wash 2x briefly with PBS-T, then wash 3x with PBS-T for 5 min.
        10. Detection by ECL. Expose blot to film for 15 sec – 5 min.

        全文下载: http://www.ebioe.com/down/html/down_327.htm

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