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T_(2CPMG)),经弛豫校正可得到测试样品的横向弛豫时间T_2。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T_(2CPMG)逐渐增大,经弛豫矫正后盒装酸奶样品T_2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。
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（T（2CPMG）） 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 T（2CPMG） 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.
作者
苗志英
夏天
陈珊珊
汪红志
马军山
MIAO Zhiying XIA Tian CHEN Shanshan WANG Hongzhi MA Junshan(School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China Institute of Medical Imaging, Shanghai University of Medicine and Health Sciences, Shanghai 200093, China Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, Shanghai 200062, China)
出处
《食品科学》
EI
CAS
CSCD
北大核心
2016年第22期155-159,共5页
Food Science
关键词
单边核磁共振
无损检测
乳制品
横向弛豫时间T2
unilateral nuclear magnetic resonance
nondestructive detection
dairy products
transverse relaxation time（T2）
