热分析在魔芋品种鉴定中的应用

Identification of Variety of Amorphophallus through Thermo Analysis

用热分析方法对魔芋品种鉴别进行了研究.采用热重分析(TG-DTG)在静态空气气氛下对白魔芋原粉、花魔芋原粉、红魔芋原粉的TG-DTG曲线进行分析,根据其图谱的特征差异进行鉴别.研究发现,在DTG曲线上白魔芋原粉、花魔芋原粉、红魔芋原粉分别在272.8、270.8、265.1℃以上时逐渐热解炭化,分别在469、476.3、433.5℃以上开始燃烧,不同魔芋品种的DTG曲线有明显差别,从峰的位置可快速简便的鉴别魔芋品种.

In the paper, various kinds of Amorphophallus are identified through thermo analysis. The TG - DTG curves AmorphaphoUus konjac, Amorphaphollus albus and AmorphaphoUus hong are investigated by TG - DTG technique in the static air atmosphere. The study shows that different kind of Amorphophallus will be carbonized when the temperature is over 272.8℃,270.8℃ and 265.1℃, and it will be burned when the temperature over is 469℃,476.3℃ and 433.5℃ in the DTG curves. By comparing the characters of DTG curves of samples, the different kind of Amorphophallus is found to have obvious difference. The various kind of AmorphophaUus is easy to distinguished according to the peak position of thermo decompose in the DTG curves.