title: Impact of additives on thermally-induced trans isomers in 9c,12c linoleic acid triacylglycerol.
abstract: Trilinolein, with or without additives, was placed in glass ampoules and subjected to thermal treatment at 180 °C or 240 °C for 8h. Thermal treatment of trilinolein at 180 °C and 240 °C produced twice the amount of trans nonconjugated linoleic acids (NLAs) compared to conjugated linoleic acids (CLAs), and nitrogen stream reduced the amount of both trans NLA and CLA products. The presence of additives resulted in the suppression or induction of trans NLAs and CLAs, depending on the type of additive, the concentration of the additive, and the heating temperature. Our analysis indicates that TBHQ is an effective additive for reducing trans NLA formation and inducing trans CLA formation in frying oil. Glutathione and L-cysteine at 0.1% may also be used as additives for frying oil. At suitable concentrations, Fe(3+) and Al(3+) ions derived from oils can reduce trans NLAs and induce trans CLAs during frying.
authors.affiliation: Institute Agro-products Processing Science and Technology, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China.
authors.forename: Qin
authors.initials: Q
authors.lastname: Guo
authors.affiliation: Institute Agro-products Processing Science and Technology, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China. Electronic address: hayiming@sina.com.
authors.forename: Yiming
authors.initials: Y
authors.lastname: Ha
authors.affiliation: Institute Agro-products Processing Science and Technology, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China.
authors.forename: Qingpeng
authors.initials: Q
authors.lastname: Li
authors.affiliation: Institute Agro-products Processing Science and Technology, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Jin
authors.affiliation: Institute Agro-products Processing Science and Technology, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China.
authors.forename: Zhaoxuan
authors.initials: Z
authors.lastname: Deng
authors.affiliation: Institute Agro-products Processing Science and Technology, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China.
authors.forename: Yongfu
authors.initials: Y
authors.lastname: Li
authors.affiliation: Institute Agro-products Processing Science and Technology, Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China.
authors.forename: Songshan
authors.initials: S
authors.lastname: Zhang
mesh_terms: D002083:Butylated Hydroxyanisole / Q000494:pharmacology; D002084:Butylated Hydroxytoluene / Q000494:pharmacology; D002849:Chromatography, Gas; D003296:Cooking; D003545:Cysteine / Q000494:pharmacology; D006358:Hot Temperature; D006873:Hydroquinones / Q000494:pharmacology; D007536:Isomerism; D019787:Linoleic Acid / Q000737:chemistry; D044243:Linoleic Acids, Conjugated / Q000737:chemistry; D044242:Trans Fatty Acids / Q000737:chemistry*; D014280:Triglycerides / Q000737:chemistry*; D014810:Vitamin E / Q000494:pharmacology
chemical_list: D006873:Hydroquinones; D044243:Linoleic Acids, Conjugated; D044242:Trans Fatty Acids; D014280:Triglycerides; D014810:Vitamin E; D002084:Butylated Hydroxytoluene; D002083:Butylated Hydroxyanisole; D019787:Linoleic Acid; C018855:2-tert-butylhydroquinone; D003545:Cysteine; C009564:trilinolein
keywords: Additives; Conjugated linoleic acids; Heat treatment; Nonconjugated linoleic acids