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Authentication of Grappa (Italian grape marc spirit) by Mid and Near Infrared spectroscopies coupled with chemometrics
Vibrational Spectroscopy ( IF 2.5 ) Pub Date : 2020-03-01 , DOI: 10.1016/j.vibspec.2020.103040
Stefano Schiavone , Benedetta Marchionni , Remo Bucci , Federico Marini , Alessandra Biancolillo

Abstract The aim of the present study is to authenticate Grappa spirits and to develop a non-destructive methodology which would allow detecting possible adulteration (by less valuable spirits) on this product. Grappa is an Italian alcoholic drink obtained by distillation of grape marks which has recently received the Geographical Indication (GI) label. As a high added-value product, it is relevant to develop methodologies which allow its authentication and detecting possible frauds (e.g., adulterations); and, whether feasible, it would be suitable to achieve these goals through non-destructive approaches (in order to minimize the economic loss). Mid Infrared (MIR) and Near Infrared (NIR) spectroscopies have been used for the authentication and the characterization of the spirits under investigation. The present work is conceptually divided into two parts: the first one, centered on the authentication of grappa spirits, focused on distinguishing them from other Italian distillates, and a second one aimed at developing an analytical methodology suitable to discern between pure and adulterated grappas. Both classification problems have been investigated by PLS-DA and by three multi-block strategies, i.e., Multi-Block Partial Least Squares (MB-PLS), Sequential and Orthogonalized Partial Least Squares (SO-PLS) and Sequential and Orthogonalized Covariance Selection (SO-CovSel) in order to test whether a data-fusion approach would lead to an improvements of the classification rates. The best results (in terms of predictions) were provided by multi-block strategies; in particular, they provided 100 % of correct classification when applied to discriminate pure and adulterated samples, suggesting these methodologies are definitely suitable for the proposed purpose.

中文翻译:

通过中红外和近红外光谱结合化学计量学鉴定格拉巴酒(意大利葡萄渣酒)

摘要 本研究的目的是对格拉巴酒进行鉴定并开发一种无损方法,以检测该产品上可能的掺假(由价值较低的烈酒)。Grappa 是一种通过蒸馏葡萄标记获得的意大利酒精饮料,最近获得了地理标志 (GI) 标签。作为一种高附加值产品,需要开发方法来验证和检测可能的欺诈(例如掺假);并且,无论是否可行,通过非破坏性方法(以尽量减少经济损失)来实现这些目标将是合适的。中红外 (MIR) 和近红外 (NIR) 光谱已被用于鉴定和表征所研究的烈酒。目前的工作在概念上分为两部分:第一部分以格拉巴酒的鉴定为中心,重点是将它们与其他意大利蒸馏酒区分开来,第二部分旨在开发一种适合区分纯格拉巴酒和掺假格拉巴酒的分析方法。PLS-DA 和三种多块策略已经研究了这两个分类问题,即多块偏最小二乘法 (MB-PLS)、顺序和正交化偏最小二乘法 (SO-PLS) 以及顺序和正交化协方差选择 ( SO-CovSel) 以测试数据融合方法是否会提高分类率。最好的结果(在预测方面)是由多块策略提供的;特别是,
更新日期:2020-03-01
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