Schubert R H, Schleidt G
Zentralbl Bakteriol Orig B. 1975 Mar;160(2):173-9.
Comparative testing of vitamin-free casein hydrolysates produced by Merck, Difco and Sheffield showed that the products are evidently fairly well standardised by the manufacturing specifications and satisfy requirements as polytropic source of N and C for microbiological test procedures in which high degree of reproducibility is demanded. Tests were conducted with strains of E. coli, A. punctata, P. aeruginosa and Myxobacter sp. and showed that differences within the trial groups in the colony count on the nutrient medium prepared with the three vitamin-free casein hydrolysates are accidental.
对默克公司、迪福公司和谢菲尔德公司生产的无维生素酪蛋白水解物进行的对比测试表明，这些产品显然相当符合生产规格标准，并且作为氮和碳的多效性来源，能满足对再现性要求很高的微生物测试程序的要求。使用大肠杆菌、斑点艾美耳球虫、铜绿假单胞菌和粘细菌属的菌株进行了测试，结果表明，在用这三种无维生素酪蛋白水解物制备的营养培养基上，试验组内菌落计数的差异是偶然的。
