Washam C J, Olson H C, Vedamuthu E R
Department of Dairy Science, Oklahoma State University, Stillwater, Oklahoma 74074.
J Food Prot. 1977 Feb;40(2):101-108. doi: 10.4315/0362-028X-40.2.101.
Psychrotrophic bacteria were isolated from 227 pasteurized milk samples which had a shelf life in excess of 20 days at 7.2 C. Of 700 cultures isolated, 135 were resistant to heating at 72 C for 16 sec and were able to re-establish growth at 7.2 C. Thirty-five cultures, representing 15 different types were subjected to detailed examination to determine their actions on refrigerated milk, growth temperatures, thermal resistance at various temperatures, and their identities. The spore-forming genus Bacillus occured most frequently. The non-sporing types were assigned to the genera Arthrobacter , Microbacterium , Streptococcus , and Corynebacterium .
从227份巴氏杀菌乳样品中分离出嗜冷菌，这些样品在7.2℃下保质期超过20天。在分离出的700个培养物中，有135个对72℃加热16秒具有抗性，并且能够在7.2℃下重新生长。对代表15种不同类型的35个培养物进行了详细检查，以确定它们对冷藏牛奶的作用、生长温度、不同温度下的耐热性以及它们的种类。形成芽孢的芽孢杆菌属出现频率最高。不形成芽孢的类型被归类为节杆菌属、微杆菌属、链球菌属和棒状杆菌属。
