基于低场核磁共振技术襄阳大头菜水分含量的测定  

Determination of different state moisture content in Xiangyang mustard root by low field nuclear magnetic resonance technique

作　　者：邹金[1] 吴竞 赵楠 周书楠 赵慧君[1] 郭壮[1] ZOU Jin1, WU Jing2, ZHAO Nan3, ZHOU Shu-nan1, ZHAO Hui-jun1, GUO Zhuang1(1 .Northwest Hubei Research Institute of Traditional Fermented Food, College of Chemical Engineering and Food Science, Hubei University of Arts and Science, Xiangyang 441053; 2.Xiangyang Institute of Food and Drug Supervision, Xiangyang 441021; 3.Institute of Agro- products Processing, Sichuan Academy of Agricultural Sciences, Chengdu 61006)

机构地区：[1]湖北文理学院化学工程与食品科学学院,鄂西北传统发酵食品研究所,襄阳441053 [2]襄阳市食品药品检验所,襄阳441021 [3]四川省农业科学院,农产品加工研究所,成都610066

出　　处：《食品科技》2018年第3期262-267,共6页Food Science and Technology

基　　金：湖北省食品药品监督管理局科研项目(201601025);襄阳市科技计划研究与开发项目(2016)：湖北文理学院食品新型工业化学科群建设项目(2017).

摘　　要：利用低场核磁共振技术采集襄阳大头菜不同部位的~1H信号,通过建立硫酸铜质量与~1H峰面积的线性关系方程,对大头菜中结合水、不易流动水与自由水的含量进行了定量,同时与直接干燥法测定的体相水(不易流动水和自由水之和)含量进行对比分析。通过相对定量分析发现,自由水为襄阳大头菜中水的主要分布形式,其平均相对含量达到了3种类型水总量的93.8%。襄阳大头菜样品中自由水、不易流动水和结合水的含量分别占到大头菜的61.56%~69.38%、0.53%~4.26%和0.09%~1.62%。低场核磁共振技术对襄阳大头菜体相水水分含量的测定结果极显著高于直接干燥法(P<0.001)。由此可见,将低场核磁共振技术应用于襄阳大头菜水分含量测定中具有较大的可行性。In this paper, low field nuclear magnetic resonance technique （LF-NMR） was used to acquire 1H signals of water in different parts of Xiangyang mustard root. The contents of bound water, extra- cellular water and free water in samples were determined through standards curves, which were the concentrations of CuSO4 solution and the peak areas. The direct drying method was adopted to determine the content of bulk water, which was the total of bound water and free water, so as to verify the results measured by LF-NMR. Results showed that free water was the dominant distribution form in Xiangyang mustard root samples, with the average relative content of 93.8% in the total 3 types of water. The contents of free water, extra-cellular water and bound water in Xiangyang mustard root samples were 61.56%-69.38%, 0.53%-4.26%, and 0.09%-1.62%, respectively. It was worth mentioning that the contents of samples detected by LF-NMR were more significant higher than direct drying method （P〈0.001）. It demonstrated that the LF-NMR technique could be used in quantitative determination of different state moisture content in Xiangyang mustard root.

关 键 词：低场核磁共振技术 水分含量 襄阳大头菜 

分 类 号：O657.2[理学—分析化学]