广西科学院学报2023，Vol.39Issue(4)：433-444,12.DOI:10.13657/j.cnki.gxkxyxb.20231226.010
基于干燥动力学结合LF-NMR分析的不同干燥过程中天麻切片水分变化
Determination of Moisture Changes in Gastrodia elata Blume Slices during Different Drying Processes Based on Drying Kinet-ics and LF-NMR Analysis
摘要
Abstract
Combining drying characteristic curves,a predictive model for Gastrodia elata Blume slice moisture content based on Low-Field Nuclear Magnetic Resonance(LF-NMR)parameters was established.In order to explore the change rule of moisture migration in the drying process of G.elata Blume slices and establish its quantitative characterization method,in this study,LF-NMR technology was used to analyze G.elata Blume slices under different hot air temperatures(60,70,80℃)and different microwave power densities(2,3,4 W/g)during Hot Air Drying(HAD)and Microwave Drying(MWD).Combined with the drying characteristic curve,a prediction model of moisture content of G.elata Blume slices based on LF-NMR parameters was es-tablished.The results showed that the drying rate of MWD was much higher than that of HAD.In the range of hot air temperature(60-80℃)and microwave power density(2-4 W/g),high temperature and high power density were beneficial to improve the drying rate and shorten the drying time.The Logarithmic model can accurately describe the change of moisture content in the process of HAD and MWD of G.elata Blume slices.LF-NMR analysis showed that in the process of HAD and MWD,the transverse relaxation time curve of G.elata Blume slices showed a trend of left shift on the whole,and the relaxation peak signal intensity of each state water decreased continuously.At the end of drying,the free water in the G.elata Blume slices was completely removed,and only a small amount of immobile water and bound water remained.Whether it is HAD or MWD,the correlation between the total area of relaxation peak A2 and the dry basis water content of G.elata Blume slices is above 0.99.The research results provide a reference for elucidating the drying mecha-nism of G.elata Blume slices and the optimization of drying process parameters.关键词
天麻/热风干燥/微波干燥/水分/低场核磁Key words
Gastrodia elata Blume/hot air drying/microwave drying/moisture content/Low-Field Nuclear Magnetic Resonance(LF-NMR)分类
轻工纺织引用本文复制引用
吴钊龙,巫腾钰,邱展鸿,黄纪民,覃海波,李秉正,黄志民..基于干燥动力学结合LF-NMR分析的不同干燥过程中天麻切片水分变化[J].广西科学院学报,2023,39(4):433-444,12.基金项目
广西科技计划项目(桂科AB18294028),贺州市创新驱动发展专项(贺科创CX2009009)和广西科学院健康食品创制创新团队启动经费项目(CQ-E-2419)资助. （桂科AB18294028）
