Rapid Analysis of Methanol in Grape-Derived Distillation Products Using Near-Infrared Transmission Spectroscopy

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• 作者：Robert G. Dambergs ; Ambrosias Kambouris ; I. Leigh Francis ; and Mark Gishen
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2002
• 出版时间：May 22, 2002
• 年：2002
• 卷：50
• 期：11
• 页码：3079 - 3084
• 全文大小：57K
• 年卷期：v.50,no.11(May 22, 2002)
• ISSN：1520-5118

文摘

Samples of distillates derived from the production of wine-fortifying spirit were analyzed for methanolby gas chromatography (GC) and near-infrared spectroscopy (NIRS). NIRS calibration models weredeveloped which could accurately predict methanol concentrations in samples of fortifying spirit thathad been produced over a period of three years from four different commercial distillation facilities.The best accuracy of the predictive models, as measured by the standard error of prediction value,was 0.06 g/L methanol. Other distillation fractions, produced during preparation of commercial fortifyingspirit, were also examined. The most useful NIRS calibration models used partial least squaresregression on continuous spectra from a scanning instrument, but it was demonstrated that calibrationscould also be developed with a smaller number of fixed wavelengths, using multiple linear regressionmodels. NIRS offers the advantages of rapid analysis, with simple routine operation, and may offerthe potential for in-line process control in the operation of a commercial distillation facility.Keywords: Methanol; alcohol; fortifying spirit; near-infrared spectroscopy