食品科学 ›› 2016, Vol. 37 ›› Issue (22): 155-159.doi: 10.7506/spkx1002-6630-201622023

• 成分分析 • 上一篇    下一篇

基于单边核磁共振技术的乳制品品质分析

苗志英1,夏 天2,陈珊珊2,汪红志1,2,3,*,马军山1,*   

  1. 1.上海理工大学光电信息与计算机工程学院,上海 200093;
    2.上海健康医学院医学影像学院,上海 200093;
    3.华东师范大学物理与材料科学学院,上海市磁共振重点实验室,上海 200062
  • 收稿日期:2015-11-02 出版日期:2016-11-16 发布日期:2017-02-22
  • 通讯作者: 汪红志(1975—),男,教授,博士,研究方向为无线电物理。E-mail:wanghzhi2000@sina.com
  • 作者简介:苗志英(1988—),女,博士研究生,研究方向为核磁共振技术。E-mail:miaozy0120@sina.com

Quality Analysis of Dairy Products Based on Unilateral Nuclear Magnetic Resonance

MIAO Zhiying1, XIA Tian2, CHEN Shanshan2, WANG Hongzhi1,2,3,*, MA Junshan1,*   

  1. 1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
    2. Institute of Medical Imaging, Shanghai University of Medicine and Health Sciences, Shanghai 200093, China;
    3. Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China
  • Received:2015-11-02 Online:2016-11-16 Published:2017-02-22

摘要: 运用单边全开放式核磁共振技术对常见掺假牛乳进行快速检测,并对室温条件下贮藏的市售盒装酸奶进行跟踪监测。在非均匀磁场下采用SGSE-CPMG(static gradient spin echo carr-purcell-meiboom-gill)序列测量各个样品的横向弛豫时间(记为T2CPMG),经弛豫校正可得到测试样品的横向弛豫时间T2。研究表明,在恒定梯度磁场中不同掺假比例样品随掺假质量浓度的升高其T2CPMG逐渐增大,经弛豫矫正后盒装酸奶样品T2峰位的变化可间接反映其新鲜度。运用单边核磁共振技术可实现乳制品品质的快速无损检测,被测样品无需复杂预处理,其系统硬件结构简单可便携(或安装)至现场进行实时检测。

关键词: 单边核磁共振, 无损检测, 乳制品, 横向弛豫时间T2

Abstract: In this study, unilateral fully-opened nuclear magnetic resonance technique was used to detect milk adulteration and to monitor boxed yogurt stored at room temperature. Static gradient spin echo carr-purcell-meiboom-gill (SGSE-CPMG) sequence was used to measure the transverse relaxation time (T2CPMG) of each sample under inhomogeneous magnetic field. Then the transverse relaxation time (T2) of the test sample was obtained by relaxation correction. The results showed that the T2CPMG of sadulterated samples increased with increasing adulterant concentration in static gradient field and the changes in T2 peak of boxed yogurt after relaxation correction could reflect its freshness. Therefore, single sided nuclear magnetic resonance technology can allow fast and nondestructive detection of the quality of dairy products, and the hardware is simple and portable (or installed) for real-time on-site detection.

Key words: unilateral nuclear magnetic resonance, nondestructive detection, dairy products, transverse relaxation time (T2)

中图分类号: