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Thermally induced structural phase transitions enhanced aliphatic aldehyde formation: A case of lamb
1Institute of Food Science and Technology, Chinese Academy of Agriculture Sciences, Key Laboratory of Agro-Products Quality and Safety Control in Harvest, Storage, Transportation, Management and Control, Ministry of Agriculture and Rural Affairs, Beijing 100193, China.
Abstract:
Understanding the relationship between thermally induced structural phase transitions (SPTs) and the formation of volatile compounds is essential for optimizing the sensory quality of meat products. Herein, lamb meat was used as a model to investigate how heat-driven SPTs modulate lipid remodeling and formation of lipid-derived volatile compounds. Differential scanning calorimetry and LF-NMR revealed three thermally induced SPTs (SPT1, SPT2, and SPT3), and hierarchical clustering confirmed strong SPT-dependent generation of lipid-derived aliphatic aldehydes. Lipidomic analysis revealed that C18:2- and C18:3-enriched triacylglycerols (TGs)/diacylglycerols (DGs) were preferentially hydrolyzed to free PUFAs, which were rapidly oxidized during SPT2-SPT3 to produce lipid-derived aliphatic aldehydes. SPT2-SPT3 was identified as the critical transition window governing the conversion of PUFAs and PUFA-containing TGs/DGs into aliphatic aldehydes during thermal processing. Overall, this study reveals how heat-induced SPTs drive lipid remodeling to regulate the formation of aliphatic aldehydes, providing mechanistic insights into flavor development in cooked meat.
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