烟草科技2016，Vol.49Issue(10)：31-35,5.DOI:10.16135/j.issn1002-0861.2016.0033
低场核磁共振法测定烘烤过程中烤烟主脉的水分
Moisture content in midrib of tobacco leaves during flue-curing as determined by LF-NMR
摘要
Abstract
In order to study the moisture variations in midrib of tobacco leaves during flue-curing, low-field nuclear magnetic resonance(LF-NMR) was used to determine the content and state of moisture, and the results were compared with those determined by a conventional oven method. The results showed that: 1) The moisture in midrib of fresh green tobacco leaves included bound water T21(1-10 ms) and free water T22(100-1 000 ms). During flue-curing, the signal amplitude of free water M22 and total water M20 decreased, and the signal amplitude of bound water M21 increased first then decreased. 2) Linear regression analysis indicated that the total signal amplitude of inversion spectrum positively correlated to the moisture content and dry weight base moisture content at a significant degree (coefficient of determination R2=0.997 9, R2=0.998 3, P<0.01). The moisture content in leaves during flue-curing could be obtained by the regression equation obtained. 3) Comparing with the oven method, the stability of LF-NMR was better. LF-NMR is thus suitable for the rapid and accurate determination of moisture contents in midrib of tobacco leaves during flue-curing.关键词
低场核磁共振/烤烟/烘烤/主脉/含水率Key words
Low-field nuclear magnetic resonance (LF-NMR)/Flue-cured tobacco/Flue-curing/Midrib/Moisture content分类
轻工纺织引用本文复制引用
魏硕,王德勋,苏家恩,李再光,徐发华,王新中,何海萍,余源,宋朝鹏..低场核磁共振法测定烘烤过程中烤烟主脉的水分[J].烟草科技,2016,49(10):31-35,5.基金项目
中国烟草总公司云南省公司资助项目“返青寡日照等条件下难落黄烟叶的烘烤技术研究及推广”（2015YN20）。 （）
