Destaining Protocols
Coomassie (CBB-R 250) Destaining Protocol
- Cut band from the gel
- Wash several times with 10 mM dithiotreitol (DTT), 0.1 M 4-ethylmorpholine acetate (pH 8.1) in 50% acetonitrile (ACN); (3 minutes in microwave oven per wash is suggested). Repeat until the Coomassie is completely removed.
- Wash gel piece with water.
- Shrink with 100% ACN (5 min sonicate)
- Reswell with water (5 min sonicate)
- Shrink with 100% ACN (5 min sonicate)
- Reswell with water (5 min sonicate)
- Wash with ACN:H2O = 1:1 (5 min sonicate) (steps 3 - 7: salt and other contaminant removal)
- Speedvac to near dryness.
- Reconstitute sample with proteolytic digestion buffer→proteolytic digest
Method developed by Petr Novak at the Laboratory of Molecular Structure Characterization, Institute of Microbiology, Prague
Published in:
Karel Drbal, Pavla Angelisova, Ivan Hilgert, Jan Cerny, Petr Novak, and Vaclav Horejsi(2001) A proteolytically truncated form of free CD18, the common chain of leukocyte integrins, as a novel marker of activated myeloid cells. Blood, 98(5): 1561-6.
SYPRO (Bio-Rad Laboratories/Molecular Probes, Inc.) Ruby Protein Gel Stain Removal
- After staining with Ruby Gel Stain excise protein band/spot from gel
- Wash the gel slices 2 x 25 mM ammonium bicarbonate in 50% acetonitrile and 1 x 100% acetonitrile
- Dry slices using a Speed Vac
- Reconstitute sample with proteolytic digestion bufferà proteolytic digest
SYPRO destaining notes provided by Bio-Rad Laboratories Technical Services department (Aug 2001)
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