PROTEOLYSIS OF PROTEINS IN RAW-RIPENING MEAT PRODUCTS USING LACTOBACILLUS CASEI ŁOCK 0900 PROBIOTIC STRAIN
Journal Title: Żywność. Nauka. Technologia. Jakość - Year 2012, Vol 19, Issue 6
Abstract
The objective of the research performed was to determine the effect of Lactobacillus casei ŁOCK 900 probiotic strain on the proteolysis of protein in raw-ripening pork loins. The research material consisted of raw-ripening pork loins with the use of probiotic strain of Lactobacillus casei ŁOCK 900. Changes were assessed immediately after the completed aging and 2 months after cool storage. Three loin variants were prepared for investigation: a control sample without the probiotic, a sample with the probiotic, and a sample with the probiotic and sodium ascorbate added. There were determined: proteolysis index, water content of water-soluble nitrogen, free amino acid, water-soluble peptides; the antioxidant activity of protein proteolysis products towards ABTS+· cation radical was assessed. The presence of probiotic strain during the aging process of raw-ripening pork loins caused the rate of protolytic changes during cool storage to be suppressed. The highest proteolysis index was found 2 months after cool storage in the control sample (10.96 %) and it was higher by 0.51 % compared to the sample with the probiotic and sodium ascorbate (P2) and by 0.52 % compared to the sample with the probiotic (P1). In the samples containing the probiotic added, 2 months after cool storage, the determined amount of free amino acids was lower (28.61 - 28.71 mg/g) compared to the control sample (29.02 mg/g). The control sample contained more peptides after aging (2.85 mg/g) and after storage (3.78 mg/g) versus the samples with the probiotic added (2.35 - 2.53 mg/g after aging and 3.24 - 3.44 mg/g after storage, respectively). After aging, the aqueous extracts of peptides in the samples with the probiotic were characterized by the highest antiradical activity of (1.4 - 1.7 mg Trolox/mg of peptides), and the free amino acids in the control sample were characterized by the lowest antiradical activity (0.03 mg Trolox/mg of amino acids).
Authors and Affiliations
Anna Okoń, Zbigniew J. Dolatowski
Keywords
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- EP ID EP126783
- DOI 10.15193/zntj/2012/85/138-151
- Views 73
- Downloads 0
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