Document Detail

Fate of lysostaphin in milk from individual cows through pasteurization and cheesemaking.
MedLine Citation:
PMID:  19164654     Owner:  NLM     Status:  MEDLINE    
Transgenic cows secreting over 3 microg of lysostaphin/ mL of milk are protected against mastitis caused by Staphylococcus aureus, but it is unknown if active lysostaphin persists through dairy processing procedures or affects the production of fermented dairy foods. The objective of this study was to determine the fate of lysostaphin as milk was pasteurized and then processed into cheese. Raw milk from transgenic cows was heat treated at 63 degrees C for 30 min, 72 degrees C for 15 s (high temperature, short time), or 140 degrees C for 2 s (UHT). Portions of the high temperature, short-time milk were manufactured into semi-hard cheeses. Aliquots taken at each processing step were assayed to determine the quantity (ELISA) and activity (ability to inhibit S. aureus growth) of lysostaphin. Results indicated that most of the lysostaphin was present in the aqueous portion of the milk and was not affected by pasteurization, although UHT treatment reduced enzyme concentration by 60%. The quantity and activity of the lysostaphin decreased during cheesemaking. Based on the amount of lysostaphin present in the starting cheesemilk, 10 to 15% of the lysostaphin was recovered in the whey, 21 to 55% in the cheese curd at d 1, and 21 to 36% in cheese stored at 4 degrees C for 90 d. Enough of the lysostaphin secreted into milk by transgenic cows survived typical dairy processing conditions to impart potential value as a bioprotective agent against staphylococci in dairy foods.
D L Van Hekken; R J Wall; G A Somkuti; M A Powell; M H Tunick; P M Tomasula
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  92     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-01-23     Completed Date:  2009-02-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  444-57     Citation Subset:  IM    
Dairy Processing and Products Research Unit, USDA, Agricultural Research Service, Eastern Regional Research Center, Wyndmoor, PA 19038, USA.
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MeSH Terms
Animals, Genetically Modified
Anti-Infective Agents, Local / metabolism*,  pharmacology
Cattle / genetics,  physiology*
Cheese / analysis*
Food Handling*
Hot Temperature
Lysostaphin / metabolism*,  pharmacology
Microbial Sensitivity Tests
Milk / chemistry*
Milk Proteins / analysis
Staphylococcus aureus / drug effects
Reg. No./Substance:
0/Anti-Infective Agents, Local; 0/Milk Proteins; EC

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