Equipment: UV-capable spectrophotometers (at least 2). 96-well plate absorbance "ELISA" reader(s). Two or 3 computers with Eric's "SEM" program. Materials: Per Class: About 200 test tubes, 12-15 ml capacity. (In 2001, students had trouble mixing dilutions in smaller tubes.) Per Bench: 2 (or at least one) vortexers. Two squirt bottles of distilled water. Two sets of four 1.5 ml cuvettes (3 UV + 1 Vis per set, UNMARKED!) Can of five ml pipets. Can of ten ml pipets. Two to four P200 pipeters. Two to four P1000 pipeters. Blue and yellow tips.Recipes:
Above: supplies/instruments to be provided/operated by TA's. Below: reagents and plates will be provided by Eric.
"Unknown IgG" 20 ml "Unknown BSA" 20 ml Per Pair: One rigid, flat-bottomed 96-well plate. NP Stock, 2 ml. Diluent/Blank, 60 ml.
Diluent (10 mM phosphate, pH 9), make 1.5 liters. Dissolve 4.0 g Na2HPO4.7H2O (FW 268) in 1.5 liters water. Not necessary to check pH; it will be close to 9.
NP Stock: need about 30 ml, so make 40 ml. Dissolve 15 milligrams of p-nitrophenol (FW 139) in 40 ml 10-mM-phosphate, pH 9. A405 of a 1/37 dilution should be checked and should be close to 0.9.
Stock tryptophan solution for fake proteins, 0.71 mM. In 100 ml pH 9 10-mM-phosphate, dissolve 14 milligrams L-tryptophan (FW 204).
Unknown IgG (fake): need 100 ml tryptophan at 0.071 mM = 71 micromolar. Add 10 ml 0.71 mM tryptophan stock to 90 ml pH 9 phosphate. A280 should be checked and should be close to 0.40.
Unknown BSA (fake): need 100 ml tryptophan at 0.035 mM = 35 micromolar. Add 5 ml 0.71 mM tryptophan stock to 95 ml pH 9 phosphate. A280 should be checked and should be close to 0.20.