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食品研究与开发:2023,44(5):48-56
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丙酮醛改性对麦醇溶蛋白功能特性及结构的影响
(1.广东省食品智能制造重点实验室,广东 佛山 528225;2.佛山科学技术学院食品科学与工程学院,广东 佛山 528225;3.华南理工大学食品科学与工程学院,广东 广州 510640)
Effects of Modification with Methylglyoxal on Functional Properties and Structure of Wheat Gliadin
(1.Guangdong Key Laboratory of Food Intelligent Manufacturing Department of Food Science,Foshan 528225,Guangdong,China;2.College of Food Science and Engineering,Foshan University,Foshan 528225,Guangdong,China;3.College of Food Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China)
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投稿时间:2022-01-10    
中文摘要: 该文模拟小麦制品热加工条件,建立麦醇溶蛋白(gliadin,Gli)-丙酮醛(methylglyoxal,MGO)体系,用邻苯二甲醛法和荧光光谱法测定不同丙酮醛添加量、糖化温度、糖化时间下,体系中游离氨基含量变化及晚期糖基化终产物(advanced glycation end-products,AGEs)生成规律,并对改性后的麦醇溶蛋白的功能特性和结构特性进行表征。结果表明,在麦醇溶蛋白与丙酮醛质量比1∶6、反应温度140℃、反应时间75 min时,产物游离氨基含量较低,AGEs生成量较少。麦醇溶蛋白与丙酮醛反应后的样品(methylglyoxal-gliadin,MGO-Gli)的乳化活性较未处理的麦醇溶蛋白(native-gliadin,N-Gli)提高50.03%,乳化稳定性提高79.51%;起泡性和泡沫稳定性分别提高13.33%、28.20%;十二烷基硫酸钠-聚丙烯酰胺凝胶电泳结果表明,麦醇溶蛋白与丙酮醛发生糖基化反应;MGO-Gli的紫外光谱结果显示,光谱峰值发生红移,说明MGO-Gli的内部结构发生伸展,使内部的色氨酸暴露;傅里叶红外光谱(Fourier transform infrared spectroscopy,FT-IR)结果表明,Gli经MGO糖基化改性后α-螺旋结构含量减少、β-折叠结构含量增加、α-螺旋/β-折叠由0.608降为0.508,说明MGO-Gli的分子柔性增加。
Abstract:The gliadin-methylglyoxal(Gli-MGO)system was established and used for the simulated thermal processing of wheat products.The effects of different MGO additions,modification temperature and time,free amino content,and the formation rule of advanced glycation end-products(AGEs)were determined by ophthaldialdehyde(OPA)-based spectrophotometric assay and fluorescence spectroscopy.The effect of MGO on the functional properties and structure modification of gliadin were evaluated.The results showed that the reaction with the Gli-to-MGO mass ratio of 1∶6 at 140℃for 75 min had the product with low free amino content and moderate formation of AGEs. Compared with native gliadin(N-Gli),MGO-Gli showed the emulsion capacity,emulsion stability,foaming capacity,and foaming stability increasing by 50.03%,79.51%,13.33%,and 28.20% respectively.The result of sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE)indicated the occurrence of glycation between Gli and MGO.The result of ultraviolet spectroscopy showed a red shift in the peak,implying the structure of Gli-MGO was extended,leading to exposure of tryptophan residues.The result of Fourier transform-infrared spectroscopy showed that the α-helix content decreased while the β-sheet content increased and the α-helix/β-sheet ratio decreased from 0.608 to 0.508 after modification with MGO,indicating that the molecular flexibility of MGO-Gli was improved.
文章编号:202305008     中图分类号:    文献标志码:
基金项目:广东省教育厅佛山科学技术学院省下达2019年教育发展专项基金高等教育“冲一流,补短板,强特色”重点项目(CGZ07309);佛山科学技术学院高层次人才科研启动项目(CGZ07001)
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