摘要
建立了热重-气相色谱/质谱联用分析检测技术,结合主成分分析化学计量学方法,实现了回收油与正常食用油的辨别。以氧气为反应气,在50℃~400℃范围内,进行了经过确认的9个不同来源的回收油样品和大豆油、花生油、菜籽油和橄榄油等4类正常食用油的热重分析,采集300℃下氧化挥发成分进行气相色谱/质谱分析,定性确认了9种挥发性成分,分别为正庚烷、辛烯、正辛烷、正己醛、壬烷、正庚醛、癸烷、辛醛和壬醛。采用主成分分析方法,分别对热重分析数据、气相色谱/质谱分析数据和两组数据共同分析,结果表明,仅采用单独一种分析技术均不能实现回收油的有效鉴别,但是结合两组数据进行主成分分析能够实现全部9种回收油与正常食用油的区分,体现出联用技术可获取多信息的优势。本方法无需样品预处理、操作简单、样品量少、速度快,在回收油筛查中具有较好的应用前景。
A method of thermogravimetric analysis-gas chromatography/mass spectrometric （TGA-GC/MS） technology combined with principal component analysis （PCA） was established to distinguish recycle oils and edible oils. TGA curve and derivative TGA （DTG） curves of nine confirmed recycle oils and four kinds of edible oils were compared in 50~C-400~C under oxygen gas. Nine volatile components in the samples were confirmed by GC/MS at 300~C, including heptane, octene, octane, hexanal, nonane, heptanal, decane, octanal and nonanal. The TGA data, GC/MS data and TGA-GC/MS data were analyzed through PCA methods, respectively. All the nine kinds of recycle oils and edible oils can be distinguished clearly based on the TGA-GC/MS information. This method was simple and rapid, and exhibited some prospect to authenticate recycle oils with the advantages such as no sample pretreatment and small sample consumption.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2015年第6期843-848,共6页
Chinese Journal of Analytical Chemistry
基金
国家重大科学仪器设备开发专项(No.2012YQ09016703)
国家公益性行业科研专项经费项目(No.20121040100-5)资助~~
关键词
热重-气相色谱/质谱
主成分分析
回收油
Thermogravimetric analysis-gas chromatography/mass spectrometry
Principal componentanalysis
Recyde oils
