Abstract:
There is a production of spirits adulteration by using a denature alcohol, formula 13 (DA13: IPA1%) in order to make a profit. That is forbidden to mix in spirits. The technique of near infrared spectroscopy was used in order to predict the adulteration of spirit by quantitative and qualitative analysis in this study. For quantitative analysis, partial least squares regression was used to develop the model to predict DA13: IPA1% in spirit. For qualitative analysis, partial least squares-discriminant analysis was used to develop the classification model to classify the adulteration in spirit. The preparation of adulteration of spirits using 1 to 90% of DA13: IPA1% was done in this research. The results of quantitative analysis found that the best model could be used to predict DA13: IPA1% in vodka (correlation coefficient or R=0.909, RMSEP=12.56%) and to predict DA13: IPA1% in whisky (R=0.731, RMSEP=20.91%). The results of qualitative analysis found that the best classification model could be used to classify the adulteration in vodka with the accuracy of 91.49% and used to classify the adulteration in whisky with the accuracy of 93.62%. Therefore the technique of near infrared spectroscopy has a potential to use for prediction and classification of adulteration of DA13: IPA1% in spirits.