反应详情

20 g of neocarzinostatin (NCS) was dissolved in 5.0 ml of 0.8M aqueous solution of sodium bicarbonate under ice-cooling in the dark. The powdery H-SMA stepwise was added in a total amount of 0.5 g in several times and dissolved thereinto. During the reaction,, the pH of the solution was kept around 8.5. The conversion of such an unreacted primary amino group originating from NCS can be determined by a method (hereinafter referred to as "TNBS" method) in which a small amount of a sample taken out from the reaction mixture 24 hours after the addition was started was diluted, and was reacted with trinitrobenzene sulfonic acid to produce a nitrobenzene derivative, which was determined based on the amount of the primary amino group spectrophotometrically by a visible absorption spectrometer at 420 nm. It was learned that the primary amino groups completely disappeared.

1. temperaturecooling in the dark
2. additionThe powdery H-SMA stepwise was added in a total amount of 0.5 g in several times
3. dissolutiondissolved
4. customDuring the reaction
5. customtaken out from the reaction mixture 24 hours
6. additionafter the addition
7. additionwas started was diluted