Activity of plasmin and plasminogen in ultra high temperature milk with high and low somatic cell counts during storage

作者：Corassin Carlos Humberto; Rosim Roice Eliana; Fernandes de Oliveira Carlos Augusto

来源：Ciencia Rural, 2010, 40(12): 2588-2592.

DOI：10.1590/S0103-84782010005000200

• UHT milk
• SCC
• quality
• proteolysis

This study aimed to evaluate the effect of somatic cell counts (SCC) in milk on plasmin and plasminogen activities of ultra high temperature (UHT) milk during storage. Raw milks were categorized in SCC groups of low (342,000-487,000 cells mL(-1)) and high cells (603,000-808,000 cells mL(-1)). Two replicates of UHT milks within each SCC category were analyzed for plasmin and plasminogen activities after 10, 30, 60, 90 and 120 days of storage at room temperature. For manufacture of UHT milk, raw milk was pasteurized and sterilized by direct vapor injection process, followed by aseptic packaging. SCC had no effect on physical-chemical characteristics of raw milk, and on plasmin or plasminogen activities in raw and UHT milks during 120 days of storage. However, independently of the SCC in raw milk, the activity of plasmin and plasminogen increased in UHT milk during storage, hence indicating a possible increase in proteolysis in the product during its shelf-life.

• 出版日期2010
• 单位中国林业科学研究院