DSpace

King Saud University Repository >
King Saud University >
COLLEGES >
Science Colleges >
College of Foods And Agricultural Science >
College of Foods And Agricultural Science >

Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9042

Title: THE CONCENTRATION OF FREE FATTY ACIDS AND FREE AMINO GROUPS IN RAW MILK FROM COWS FED HIGH OR LOW AMOUNTS OF CON CENTRA TE
Authors: RA. Alkanhal
M. A. Alshaikh
M. S. Salah
Issue Date: 2000
Abstract: Milk lipase activity, initial concentration of free fatty acids (FF A) and free amino groups and subsequent lipolysis and proteolysis were measured in raw milk from cows fed either high (70%) or low (40%) amounts of concentrate. Lipase activity (2.36 ueq ofFFA/mllh) and initial FFA concentration (0.26 meqllOO g offat) were higher in raw milk from cows fed high amounts of concentrate than those in raw milk from cows fed low amounts of concentrate (2.04 ueq ofFFA/ml/h and 0.14 meq/100 g of fat, respectively). Spontaneous lipolysis at 24 and 48 h was also higher in raw milk from cows fed high amounts of concentrate than in raw milk from cows fed low amounts of concentrate. Initial content of free amino groups (2.12 mmol/100 g of protein) and subsequent proteolysis at 4& h (2.28 mmol/100 g of protein) were higher (not significantly) in raw milk from cows fed a high concentrate ration than those in raw milk from cows fed a low concentrate ration (1.99 and 2.14 mmolllOO g of protein, respectively). Some differences in lipolysis and proteolysis in raw milk were observed between weeks of treatment. Increased lipolysis and proteolysis products in raw milk from cows fed a diet high in concentrate may increase the rate of off-flavour appearance in milk and dairy products. : Key words: Milk lipase, fatty acids, Lipolysis, off flavour, proteolysis
URI: http://hdl.handle.net/123456789/9042
Appears in Collections:College of Foods And Agricultural Science

Files in This Item:

File Description SizeFormat
90.docx13.21 kBMicrosoft Word XMLView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

DSpace Software Copyright © 2002-2007 MIT and Hewlett-Packard - Feedback