FTIR-ATR spectroscopy applied to quality control of grape-derived spirits

卷:205

Anjos, Ofelia ; Santos, Antonio J. A. ; Estevinho, Leticia M. ; Caldeira, Ilda

Inst Politecn Castelo Branco

关键词: Methanol;    Alcoholic strength;    Fusel alcohols;    Grape-derived spirits;    Fourier transform infrared spectroscopy;    Attenuated total reflectance;   

DOI  :  10.1016/j.foodchem.2016.02.128

学科分类：食品科学和技术

【 摘 要 】

The Fourier transform infrared (FTIR) spectroscopic method with attenuated total reflectance (ATR) was used for predicting the alcoholic strength, the methanol, acetaldehyde and fusel alcohols content of grape-derived spirits. FTIR-ATR spectrum in the mid-IR region (4000-400 cm(-1)) was used for the quantitative estimation by applying partial least square (PLS) regression models and the results were correlated with those obtained from reference methods. In the developed method, a cross-validation with 50% of the samples was used for PLS analysis along with a validation test set with 50% of the remaining samples. Good correlation models with a great accuracy were obtained for methanol (r(2) = 99.4; RPD = 12.8), alcoholic strength (r(2) = 97.2; RPD = 6.0), acetaldehyde (r(2) = 98.2; RPD = 7.5) and fusel alcohols (r(2) from 97.4 to 94.1; RPD from 6.2 to 4.1). These results corroborate the hypothesis that FTIR-ATR is a useful technique for the quality control of grape-derived spirits, whose practical application may improve the efficiency and quickness of the current laboratory analysis. (C) 2016 Elsevier Ltd. All rights reserved.