Abstract
Research into the recycling and valorization of pork processing waste is necessary, so this work aimed to evaluate the quality parameters and fatty acid composition of greasy pork waste during the chemical refining process, as well as the energy balance. Each step of the chemical refining process was evaluated through the acidity index, peroxide, iodine values and fatty acid composition. The results indicate that chemical refining reduced the acidity index by 63%, but favored oxidation, which was confirmed by the higher peroxide value. However, the fatty acid composition was not affected, indicating that the nutritional quality of the grease or waste was preserved. Palmitic, oleic and linoleic acids constituted approximately 79.4% of total fatty acids identified. The polyunsaturated fatty acids (PUFA) content reached 20.22% in the refined product, highlighting the content of linoleic acid (18.77%) and α-linolenic acid (0.72%). Although a positive output/input energy ratio was obtained (3.05), indicating an energetically favorable process, chemical refining could be replaced by ultrafiltration in oils with low levels of peroxide. The products obtained from the chemical refining of greasy pork waste have great applicability, adding value to meat industry waste and reducing environmental impacts.
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