利用LF-NMR研究杏鲍菇热风干燥过程中的水分迁移  

Migration Rule of Water in Pleurotus eryngii during Drying

作　　者：周先民 Zhou Xianmin(Hubei Institute of Aerospace Chemical Technology,Xiangyang Hubei 441000,China)

机构地区：[1]湖北航天化学技术研究所,湖北襄阳441003

出　　处：《襄阳职业技术学院学报》2022年第5期70-73,共4页Journal of Xiangyang Polytechnic

摘　　要：为探讨食用菌在干制过程中的水分变化规律,以新鲜的杏鲍菇为研究对象,采用低场核磁共振弛豫技术(low field-nuclear magnetic resonance,LF-NMR)研究其肉质菌柄在50℃、60℃、70℃、80℃和90℃条件下的水分迁移规律。结果表明,杏鲍菇的低场核磁共振弛豫图谱共有3个明显的吸收峰,分别对应于自由水、半结合水和结合水。干燥时间的延长和温度的升高均导致各吸收峰向左迁移,与此同时,各峰信号幅值减小,核磁锋面积总和也随之减少。其中,自由水信号幅值的降低最为显著。另外,杏鲍菇在干燥过程中的干基含水率与其低场核磁总信号面积之间存在显著的线性关系,因此,利用LF-NMR对杏鲍菇进行无损检测时可根据线性关系间接得知其水分含量。In order to acquire the water change during edible mushrooms drying,we studied the moisture transferring in fresh Pleurotus eryngii stipe under 50℃,60℃,70℃,80℃and 90℃with low field-nuclear magnetic resonance(LF-NMR).The results showed that there were three obvious absorption peaks on the LFNMR spectrum,corresponding to free water,semi-bound water and bound water.Prolonged time and increased temperature resulted to all absorption peaks moved to the left.Meanwhile,the amplitude of each peak signal decreased,and the total area of the nuclear magnetic front also decreased.Among these,the decrease of free water signal amplitude was the most significant,indicating that the free water lost the most.In addition,there was a significant linear relationship between the dry base moisture content and its low field nuclear magnetic total signal area.Therefore,LF-NMR can be used to determine the moisture content of Pleurotus eryngii.

关 键 词：低场核磁共振弛豫技术 热风干燥 水分迁移 杏鲍菇 

分 类 号：S162[农业科学—农业气象学]