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Position: Home > Articles > Detection of glucose adulterated in Ilex Kudingcha using thermal analysis Transactions of the Chinese Society of Agricultural Engineering 2006,22 (10) 243-245

热分析法检测苦丁茶掺杂葡萄糖

作  者:
但悠梦;聂光华;王艳;余爱农;胡卫兵
单  位:
湖北民族学院化学与环境工程学院
关键词:
苦丁茶;掺杂;葡萄糖;热重-微分热重法;差示扫描量热法
摘  要:
用热分析方法对苦丁茶掺杂葡萄糖后热分解变化规律进行了研究,建立了一种快速简便鉴别苦丁茶掺杂的新方法。采用热重-微分热重法(TG-DTG)和差示扫描量热法(DSC)在静态空气气氛下对纯苦丁茶及掺入5%、10%、15%、20%、25%、30%质量分数葡萄糖的苦丁茶TG-DTG和DSC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曲线上苦丁茶311℃左右时逐渐热解炭化,456℃以上开始燃烧;在DSC曲线上332℃左右和476℃左右有明显放热峰,纯苦丁茶和掺杂葡萄糖的苦丁茶的DTG曲线或DSC曲线都有明显差别,从峰的位置和焓值可快速简便的鉴别纯苦丁茶和掺杂苦丁茶。
译  名:
Detection of glucose adulterated in Ilex Kudingcha using thermal analysis
作  者:
Dan Youmeng,Nie Guanghua,Wang Yan,Yu Ainong,Hu Weibing(School of Chemistry and Environmental Engineering,Hubei Institute for Nationalities,Enshi,Hubei 445000,China)
关键词:
Ilex Kudingcha;doping;glucose;thermogravimentrydifferential thermogravimetry(TG-DTG);differential scanning calorimetry(DSC)
摘  要:
Thermal decomposition varying regular of the Ilex Kudingcha adulterated glucose was analyzed using thermal analysis.A new rapid and convenient method to detect the glucose adulterated in Ilex Kudingcha was founded.The thermogravimentry-differential thermogravimetry(TG-DTG) and differential scanning calorimetry(DSC) curves of the pure Ilex Kudingcha and doped with 5%,10%,15%,20%,25%,30% of glucose in mass have been analyzed.Results show that the Ilex Kudingcha will be carbonized when the temperature is at about 300℃ and it will be burned when the temperature exceeds 456℃,and there is obviously exothermic peak at about 332℃ and 476℃ on DSC curve.The DTG and DSC curves of the pure Ilex Kudingcha and the Ilex Kudingcha adulterated glucose are different.It is easy to distinguish the pure Ilex Kudingcha and the doped Ilex Kudingc according to the peak position and enthalpy value.

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