title: Lipolysis and lipid oxidation during processing of Chinese traditional smoke-cured bacon.
abstract: Lipolysis and lipid oxidation as well as the relationship between them during processing of Chinese traditional smoke-cured bacon were studied by evaluating the changes in physicochemical parameters, lipase and lipoxygenase (LOX) activities, lipid content, fatty acid composition, peroxide value (POV), and thiobarbituric acid reactive substances (TBARS). Besides phospholipids, triacylglycerols (TAG) were an important source of free fatty acids in bacon, resulting in an increase in free fatty acid content in the mid-late stage of processing, whilst phospholipids hydrolysed intensely in the early stage. Preferential lipolysis was observed for polyunsaturated fatty acids in phospholipids and for linoleic and palmitic acids in TAG. The lipolysis of TAG and phospholipids was independent and catalysed by acid lipase and phospholipase, respectively. ANOVA-partial least squares regression (APLSR) analysis showed that POV and TBARS were poorly related to LOX and closely associated with phospholipid degradation. Therefore, autoxidation may be the main cause of muscle lipid oxidation in smoke-cured bacon, which was promoted by phospholipid hydrolysis.
authors.affiliation: College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, PR China. Electronic address: hyc2005@sina.com.
authors.forename: Yechuan
authors.initials: Y
authors.lastname: Huang
authors.forename: Hongjun
authors.initials: H
authors.lastname: Li
authors.forename: Tian
authors.initials: T
authors.lastname: Huang
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.forename: Juan
authors.initials: J
authors.lastname: Sun
mesh_terms: D000818:Animals; D005511:Food Handling; D008049:Lipase / Q000737:chemistry; D008055:Lipids / Q000737:chemistry*; D008066:Lipolysis; D008084:Lipoxygenase / Q000737:chemistry; D008461:Meat Products / Q000032:analysis*; D018482:Muscle, Skeletal / Q000737:chemistry* / Q000201:enzymology; D010084:Oxidation-Reduction; D013552:Swine
chemical_list: D008055:Lipids; D008084:Lipoxygenase; D008049:Lipase
keywords: Lipid oxidation; Lipolysis; Smoke-cured bacon