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Title	Valorization of Agro-Industrial Residues: Bioprocessing of Animal Fats to Reduce Their Acidity
ID_Doc	27973
Authors	Martins, AA; Andrade, S; Correia, D; Matos, E; Caetano, NS; Mata, TM
Title	Valorization of Agro-Industrial Residues: Bioprocessing of Animal Fats to Reduce Their Acidity
Year	2021
Published	Sustainability, 13.0, 19
Abstract	Adding value to agro-industrial residues is becoming increasingly important, satisfying needs to promote resources' use efficiency and a more sustainable and circular economy. This work performs a parametric and kinetic study of enzymatic esterification of lard and tallow with high acidity, obtained by the rendering of slaughter by-products, allowing their use as a feed ingredient and increasing their market value. After an initial analysis of potential enzyme candidates, a Candida antarctica lipase B was selected as a biocatalyst for converting free fatty acids (FFA) to esters, using excess ethanol as the reagent. Results show that the fat acidity can be reduced by at least 67% in up to 3 h of reaction time at 45 degrees C, using the mass ratios of 3.25 ethanol/FFA and 0.0060 enzyme/fat. Kinetic modelling shows an irreversible second-order rate law, function of FFA, and ethanol concentration better fitting the experimental results. Activation energy is 54.7 kJ/mol and pre-exponential factor is 4.6 x 10(6) L mol(-1) min(-1).
PDF	https://www.mdpi.com/2071-1050/13/19/10837/pdf?version=1633943656

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