Abstract

RAMIREZ- RAMIREZ, J. C. et al. Utilization of fisheries by-catch and processing wastes for lactic acid fermented silage and evaluation of degree of protein hydrolisis and in vitro digestibility. Rev. Mex. Ing. Quím [online]. 2008, vol.7, n.3, pp.195-204. ISSN 1665-2738.

The purpose of this study was to produce protein hydrolysates from lactic acid fermentation of three sources of fish wastes: Shrimp by catch (SC), Sphyraena ensis wastes (SB) and mixture of fisheries processing wastes from several species (MixW). MixW were added with several sugar cane molasses concentrations as the carbon source, 180 g.kg^-1 of sugar molasses gave the fastest acidification. The maximum concentration of lactic acid (P_max) was significantly higher with Lactobacillus sp. B2 than that obtained with Lb. plantarum. MixW was selected for scaling up and inoculated with Lactobacillus sp. B2 due to the enhanced lactic acid production and availability. According to microbiological and chemical analyses, the fermented product was well preserved due to the acid produced and the reduction in a_W (0.94) that inhibit spoilage microorganisms and putrefaction. The coefficient of protein hydrolysis at 144 h of fermentation was significantly higher (0.94) than the obtained with raw MixW (0.12). The coefficient of protein in vitro digestibility (CPD) was also determined, which was higher, 0.88, than raw MixW (0.69).

Keywords : fish wastes; Lactobacillus; protein hydrolysis; digestibility; lactic acid.

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