The Influence of Heat Treatment in Liquid Whey at Various pH on Immunoglobulin G and Lactoferrin from Yak and Cows Colostrum/MilkShimo Peter Shimo1,3*, Wu Xiaoyun1, Ding xuezhi1, Xiong Lin2 and Yan Ping1
- *Corresponding Author:
- Shimo Peter Shimo
Lanzhou Institute of Husbandry and Pharmaceutical Sciences
Chinese Academy of Agricultural Sciences
Lanzhou P.R. China
E-mail: [email protected]
Received date: August 28, 2015; Accepted date: September 16, 2015; Published date: September 21, 2015
Citation: Shimo SP, Xiaoyun W, Xuezhi D, Lin X, Ping Y, et al. (2015) The Influence of Heat Treatment in Liquid Whey at Various pH on Immunoglobulin G and Lactoferrin from Yak and Cows’ Colostrum/Milk. J Food Process Technol 6:503. doi:10.4172/2157-7110.1000503
Copyright: © 2015 Shimo SP, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Yak milk is gaining popularity yearly, as a source of nutritious, immune, less likely to cause allergies than cows’ milk and a means of generating income, though ranked behind bovine milk in China. The main objective of the research was to compare the Immunoglobulin G (IgG) and Lactoferrin (LF) concentrations of liquid whey from Yak and dairy Cows’ colostrum or milk. Thereafter, the thermal stability of liquid whey was evaluated by measuring the concentration change in IgG and LF using an ELISA technique, as influenced by temperature and pH after centrifugation. IgG and LF concentrations in liquid whey from colostrums both in yak and cow were significantly higher (p<0.05) compared to milk. IgG did not differ significantly (p>0.05) between yak and cow’s milk, as well as between yak and cow’s colostrum. Also, LF content was not significant different between yak and cow milk. However, LF concentration was significantly higher in cows’ colostrum than in yak. With reference to IgG content, yak breed observed to produce high quality colostrum for all samples tested compared to cows. The extent of IgG and LF denaturation confirmed to increase with increased protein concentration, temperature and pH change near to pI. Colostral IgG and LF were more denatured compared to milk in both yak and dairy cows. There was significant (p<0.05) influence of pH changes resulted in either partial or complete denaturation or increased tendency to aggregate, which was removed during centrifugation. Liquid whey less affected at lower pH and at mild heat temperatures.