Silage production from agro-industrial by-products fermented with lactic acid bacteria isolated from the marine environment
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Universidad Nacional de Colombia
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The increase in demand for food induces food industry activity, generating waste that could be used as silage for animal feed through biological fermentation. This study evaluated the evolution of physicochemical parameters of biological silage (BS) using by-products from food industries through a seven-day fermentation process. The silages of fish muscle and whey (F+W), and fish muscle and residual brewer's yeast (F+RBY) were inoculated with lactic acid bacteria (LAB), previously selected. The drop in pH, water-soluble protein fraction, trichloroacetic acid-soluble protein fraction and antimicrobial activity were registered in both matrices. The total protein content, antioxidant activity, trypsin inhibition, phytase activity, free phosphorus determination and Ca2+, Fe2+, Mg2+ concentrations were registered in F+RBY. A pH drop was registered in both matrices (F+RBY=5.4; F+W=5.47). In both cases, the soluble peptide concentration in water and trichloroacetic acid increased during the fermentation process, and the antimicrobial activity was registered from day one of the fermentation process. Complimentary assays were carried out only with F+RBY. An increase in the antioxidant capacity of BS was detected with DPPH and CUPRAC methods. The total protein content displays no significant differences during assays. The phosphate concentration remained stable, with values of 2.06 and 1.72 mg g-1 of silage for the control and BS, respectively. Low phytase activity was registered through the fermentation process, and the concentration of divalent cations remained stable during the fermentation process. Trypsin inhibitory activity was not registered. The use of matrices from discards of the feed industry, fermented with LAB, used for animal feed suggests a potential application for the revaluation of by-products.
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Agrociencias