LF-NMR和DSC技术在小麦仓储品质劣变分析中的应用  

Application of LF-NMR and DSC in the Analysis of Wheat Storage Quality Deterioration

作　　者：梁筱妍 张爱琳 杨薇 樊秀花 LIANG Xiao-yan;ZHANG Ai-lin;YANG Wei;FAN Xiu-hua(College of Food Science and Biotechnology,Tianjin Agricultural University,Tianjin 300384,China;College of Basic Science,Tianjin Agricultural University,Tianjin 300384,China)

机构地区：[1]天津农学院食品科学与生物工程学院,天津300384 [2]天津农学院基础科学学院,天津300384

出　　处：《食品研究与开发》2021年第21期103-109,共7页Food Research and Development

基　　金：国家重点研发计划子课题(2019YFC1605305-03);天津市重点研发计划项目(20YFZCSN00300)。

摘　　要：针对小麦仓储过程中出现的品质劣变问题,以北方实仓储藏的硬质白小麦为研究对象,通过测定仓储过程中小麦的色差、水分、脂肪、脂肪酸、淀粉含量等指标反映品质劣变程度;采用低场核磁共振成像技术(low-field nuclear magnetic resonance,LF-NMR)和差示扫描量热法(differential scanning calorimetry,DSC)可视化检测小麦仓储过程中水分传递和淀粉转变现象,寻找仓储过程中小麦水分迁移变化规律以及直链淀粉、支链淀粉的转化关系,探索小麦淀粉糊化反应。结果表明,小麦在仓储过程中色泽逐渐变暗,脂肪酸含量增加,水分、脂肪和淀粉总量减少,LF-NMR和DSC检测结果表明长期仓储小麦受环境因子影响会使其结合水的含量升高,自由水含量下降,糊化温度降低。This study considered the deterioration of wheat quality in the storage process,taking hard white wheat in north real storage as the research object.The quality deterioration index was measured by measuring the color difference,moisture,fat,fatty acid,starch content and other indices of wheat in the storage process.Low-field nuclear magnetic resonance imaging(LF-NMR)and differential scanning calorimetry(DSC)were used to detect visually the phenomenon of water transfer and starch transformation in the wheat storage process.These methods were also used to identify the change rule of water transfer and the transformation relationship between amylose and amylopectin in the wheat storage process and to examine the starch gelatinization mechanism.Results showed that the color of wheat gradually darkened,the fatty acid content increased,and the total amount of water,fat and starch decreased in the storage process.LF-NMR and DSC test results showed that the long-term storage of wheat under the influence of environmental factors increased the content of bound water,decreased the content of free water and reduced the gelatinization temperature.

关 键 词：小麦仓储 品质劣变 可视化检测 低场核磁共振成像技术 差示扫描量热法 

分 类 号：TS210.7[轻工技术与工程—粮食、油脂及植物蛋白工程] O657.2[轻工技术与工程—食品科学与工程]