酪蛋白磷酸肽的制备及性质

用不同的蛋白水解酶水解牛乳酪蛋白，通过钙－乙醇沉淀法和离子交换法从水解产物中提取酪蛋白磷酸肽（ＣＰＰｓ），并对ＣＰＰｓ进行体外化学分析及体内生物学功能鉴定，结果表明：用双酶法（胰蛋白酶和Ａｌｃａｌａｓｅ）制得的ＣＰＰｓ３（平均相对分子质量为４ ０６６，摩尔Ｎ／Ｐ为５．４８）在体外的持钙能力最强，连续喂食该样品的小鼠对钙的吸收明显提高（吸收率达５６％ ）。     

Diastereoselective hydrolysis of peptide esters by alkaline protease Preparation of racemization-free peptides

A new and practiscal enzymatic procedure for preparative diastereoselective hydrolysis of peptide esters using the alkaline protease alcalase as a catalyst was developed. This procedure has been successfully applied to the resolution of peptide diastereomers and synthesis of racemization free peptides.     

Possible adverse reactions to an enzyme-containing washing powder

Following the launch of an enzyme (alcalase) containing washing powder, the manufacturers received numerous complaints from domestic users suggesting that it was responsible either for the precipitation of a rash or the exacerbation of a pre-existing rash. The 255 individuals living in London postal districts who complained to the manufacturers were contacted: 80 of them agreed to be investigated by patch and prick testing, and to a user test involving the double blind wearing of vests washed with the product. The results failed to substantiate that the enzyme containing washing powder was responsible for any dermatological problem.