The changes of Trp-deficient linusorb during the oxidation and the influence of γ-tocopherol on their oxidative stability  

作　　者：Dujian Deng Jule Li Jiahui Yu Wanzhen Li Martin J.T.Reaney Zizhe Cai Yong Wang 

机构地区：[1]Guangdong Saskatchewan Oilseed Joint Laboratory,Department of Food Science and Engineering,Jinan University,Guangzhou 510632,China [2]Department of Plant Sciences,University of Saskatchewan,51 Campus Dr.,Saskatoon,Canada

出　　处：《Grain & Oil Science and Technology》2024年第4期219-228,共10页粮油科技（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.31920103012 and 32372356);Guangzhou Basic and Applied Basic Research Foundation (Grant No.202201010535).

摘　　要：Linusorbs(LOs),particularly the Methionine(Met)-containing yet Tryptophan(Trp)-free LO(CLB and CLP),play a significant role in shaping the quality and sensory attributes of flaxseed oil.To investigate the stability of these LOs and their oxidized forms during accelerated oxidation,the polar fractions of crude flaxseed oil were selectively removed using silica absorption and then reintroduced separately into the oil matrix along with LOs andγ-tocopherol(γ-T).Through comprehensive analysis of oxidative stability indexes,LOs content changes,oxidation kinetics,and the correlation between LOs and oxidative stability indexes,we observed that the LOs fraction alone exhibited a moderate antioxidant effect on the peroxide value(PV)but a weaker effect on the panisidine value(p-AV)of flaxseed oil.However,upon addition ofγ-T,we observed a weak synergistic effect betweenγ-T and LOs in suppressing PV,while a stronger effect in suppressing p-AV.Additionally,a comparison of the oxidation kinetics of different LOs indicated thatγ-T preferentially protected the oxidation of CLP over CLB.Similar protective trends ofγ-T towards the methionine sulfoxide(MetO)and methionine sulfoxide(MetO2)form of LOs were also observed,albeit to a lesser extent.Correlation analysis revealed that changes in Metcontaining LOs,particularly CLP,showed a high correlation with PV in the tested matrices,while MetOcontaining LOs better depicted changes in p-AV.Importantly,CLP demonstrated higher susceptibility to the influence of antioxidants,making it more suitable for evaluating the peroxide value in flaxseed oil samples.

关 键 词：Flaxseed oil Cyclolinopeptide γ-Tocopherol Oxidative stability 

分 类 号：TS221[轻工技术与工程—粮食、油脂及植物蛋白工程]