Evolution Analysis of Free Fatty Acids and Aroma-Active Compounds during Tallow Oxidation |
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| Authors: | Shiqing Song Feiting Zheng Xiaoyan Tian Tao Feng Lingyun Yao Min Sun Lei Shi |
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| Institution: | 1.School of Perfume and Aroma Technology, Shanghai Institute of Technology, Shanghai 201418, China; (S.S.); (F.Z.); (X.T.); (T.F.); (L.Y.);2.Pudong New Area Agro-Technology Extension Center, Shanghai 201201, China; |
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| Abstract: | To explore the role of fatty acids as flavor precursors in the flavor of oxidized tallow, the volatile flavor compounds and free fatty acid (FFAs) in the four oxidization stages of tallow were analyzed via gas chromatography (GC)–mass spectrometry (MS), the aroma characteristics of them were analyzed by GC–olfactory (GC-O) method combined with sensory analysis and partial least-squares regression (PLSR) analysis. 12 common FFAs and 35 key aroma-active compounds were obtained. Combined with the results of odor activity value (OAV) and FD factor, benzaldehyde was found to be an important component in unoxidized tallow. (E,E)-2,4-Heptadienal, (E,E)-2,4-decadienal, (E)-2-nonenal, octanal, hexanoic acid, hexanal and (E)-2-heptenal were the key compounds involved in the tallow flavor oxidation. The changes in FFAs and volatile flavor compounds during oxidation and the metabolic evolution of key aroma-active compounds are systematically summarized in this study. The paper also provides considerable guidance in oxidation control and meat flavor product development. |
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| Keywords: | oxidized tallow aroma-active compounds solvent-assisted flavor evaporation gas chromatography-olfactometry partial least-squares regression |
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