title: Light-induced oxidation and isomerization of all-trans-β-cryptoxanthin in a model system.
abstract: The oxidation and isomerization of all-trans-β-cryptoxanthin as affected by iodine-catalysed illumination and non-iodine-catalysed illumination were studied. Seven cis-isomers and two oxidation products were separated by HPLC method using a C30 column. The identification and structural elucidation of the compounds were determined by HPLC-DAD-APCI-MS. Five compounds were identified in details for the first time, namely, β-β-carotene-3-one, 5,6-epoxy-β-β-carotene-3-one, 13,15-di-cis-, 9,13-di-cis- and 9,9'-di-cis-β-cryptoxanthin. Sum of 13- and 13'-cis-β-cryptoxanthin was the major cis-isomer of β-cryptoxanthin formed, accounting for 59.0% and 30.6%, respectively. The formation of di-cis isomers may prefer in the present of iodine. 13,15-di-cis-β-cryptoxanthin was the major di-cis-isomer of the iodine-catalysed photo-isomerization.
authors.affiliation: Institute of Farm Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; College of Forestry, Northeast Forestry University, Harbin 150040, China. Electronic address: lidajing@163.com.
authors.forename: Dajing
authors.initials: D
authors.lastname: Li
authors.affiliation: Institute of Farm Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: xyd15838746910@163.com.
authors.forename: Yadong
authors.initials: Y
authors.lastname: Xiao
authors.affiliation: Institute of Farm Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China. Electronic address: zzyszy2012@163.com.
authors.forename: Zhongyuan
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Institute of Farm Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China. Electronic address: liuchunquan2009@163.com.
authors.forename: Chunquan
authors.initials: C
authors.lastname: Liu
mesh_terms: D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D065366:Cryptoxanthins / Q000737:chemistry*; D007454:Iodides / Q000737:chemistry; D007536:Isomerism; D007700:Kinetics; D008027:Light; D010084:Oxidation-Reduction; D017382:Reactive Oxygen Species / Q000737:chemistry; D019207:beta Carotene / Q000737:chemistry
chemical_list: D065366:Cryptoxanthins; D007454:Iodides; D017382:Reactive Oxygen Species; D019207:beta Carotene