Authors : Theera Rukkwamsuk, Kitsada Bumrungkit and Natthana Thitichayaphong
Abstract: The objective was to evaluate the concentrations of lactic and benzoic acids in milk during 6 h after collection. Ten composite milk samples from 10 healthy lactating dairy cows were collected. At 0-6 h after collection, milk samples were analyzed for the concentrations of lactic acid by titration method and for the concentrations of benzoic acid by high-performance liquid chromatography. Results revealed that average concentrations of lactic acid at 0 h were 129.6±7.0 mg dL-1 and the concentrations gradually increased during the 6 h post-collection period. At 6 h after collection, the concentrations were 158.9±4.3 mg dL-1. Similar results were also observed for benzoic acids. At 0 and 6 h after collection, average concentrations were 0.09±0.06 and 0.13±0.03 ppm, respectively. These results confirmed that lactic and benzoic acids were normally found in fresh milk and their concentrations were increased when the measurement time increased.
Theera Rukkwamsuk, Kitsada Bumrungkit and Natthana Thitichayaphong, 2012. Changes of Lactic and Benzoic Acid Concentrations in Milk During Post-Collection Period. Journal of Animal and Veterinary Advances, 11: 968-970.