Chromatic signatures of broadband optical spectra for liquor discrimination

Jones, G.R.; Deakin, Anthony; Spencer, J. W.

doi:10.1088/0957-0233/20/2/025304

Cited by 13 publications

(12 citation statements)

References 12 publications

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“…10,24,30 For whiskies, it was reported that absorbance patterns could be established for specific Scotch brands; therefore any variation out of range of the established values could signify an adulteration. For the discrimination among tequilas, Barbosa-Garcia et al, 25 and Jones et al, 26 used the measured spectra with chemometrics calculations and methods based upon chromatic analysis of the broadband, respectively. However, these studies were conducted without the aid of chromatography to support the analysis.…”

Section: Spectral Characteristics Of Tequila and Mezcal Samplesmentioning

confidence: 99%

“…For the case of tequila, chromatic analysis and chemometrics tools have been applied to FT-IR and UV-Vis absorption spectra to discriminate between 100% agave and mixed tequilas as well as among tequilas from different brands. [25][26][27][28] As of the present time, however, no study has been reported which uses UV absorption spectrophotometry to discriminate tequilas from mezcals, nor which attempts to identify the individual chemical components responsible for the UV spectral behavior of these spirits by using RP-HPLC.…”

Section: Introductionmentioning

confidence: 99%

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Identification and quantification of furanic compounds in tequila and mezcal using spectroscopy and chemometric methods

Muñoz-Muñoz

Pichardo‐Molina²,

Ramos‐Ortíz³

et al. 2010

J. Braz. Chem. Soc.

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Neste artigo, duas bebidas mexicanas com denominação de origem controlada (DOC), tequila e mezcal, foram facilmente discriminadas por espectrofotometria UV-Vis e métodos quimiométricos. Os espectros foram registrados na faixa de 250-400 nm; a principal característica foi uma banda larga centrada em torno de 280 nm, cuja amplitude varia segundo o tipo de bebida e de marca. No entanto, diferenças adicionais foram identificadas através de análise multivariada, mostrando uma distinção clara entre as bebidas. Usando RP-HPLC com detector ultravioleta, os compostos que têm origem na banda de absorção foram determinados. Portanto, o espectro de cada bebida na faixa de comprimento de onda de 250-330 nm aproximadamente, mostrou uma mistura particular de furfural (FUR), 2-acetilfurano (2AF) e 5 methylfurfural (5MF). Além disso, os espectros de absorção das misturas de FUR, 2AF e 5MF foram registrados em diferentes concentrações e com um modelo de mínimos quadrados parciais (PLS), as concentrações desses compostos foram previstas em amostras de teste e em licores. Quando estes resultados foram comparados com os obtidos por HPLC, os coeficientes de correlação foram de R ≥ 0,920. Portanto, esta metodologia apresenta um método alternativo para identificar e quantificar alguns compostos furanos em tequilas brancas e mezcales. Além destes resultados, a metodologia pode ser realizada in situ e resultados específicos no controle de qualidade podem ser obtidos em poucos minutos.In this paper, two Mexican white spirits with appellation d'origen contrôlée (AOC), i.e., tequila and mezcal were easily discriminated by using UV-Vis spectrophotometry and chemometric techniques. The spectra were recorded in the range of 250-400 nm and their main feature is a broad band centered about 280 nm whose amplitude changes according to the type of beverage and brand, however, additional differences are pointed out through multivariate analysis that makes a fair differentiation between the beverages. By using RP-HPLC with UV detector, the compounds that originate the absorption band were determined. Thus, the spectrum of each beverage in the wavelength range of 250-330 nm, approximately, is a particular mixture of furfural (FUR), 2-acetylfuran (2AF) and 5-methylfurfural (5MF). Further, the absorption spectra of mixtures of FUR, 2AF and 5MF standards were recorded at several concentrations and by using a partial least square model (PLS), the concentrations of those compounds were predicted in test and spirit samples. When these results were compared to those obtained by HPLC, the correlation coefficients were R ≥ 0.920. Therefore, with this methodology one builds up an alternative method to identify and quantify some furanic compounds in white tequilas and mezcals. In addition to these results, the methodology can be performed on site and results about specific quality controls can be obtained within minutes.

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Section: Spectral Characteristics Of Tequila and Mezcal Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification and quantification of furanic compounds in tequila and mezcal using spectroscopy and chemometric methods

Muñoz-Muñoz

Pichardo‐Molina²,

Ramos‐Ortíz³

et al. 2010

J. Braz. Chem. Soc.

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show abstract

“…The outputs were also processed by CIE (Commission Internationale de l'Eclairage) chromaticity coordinates (x, y), Saturation (S) and Hue (H) algorithms of color science [21][22][23] for comparison. Hence, CR and other chromatic parameters were applied to DTE24 #2 and DTE25 oils sampled a steel factory (POSCO, Korea); the results presented in Table 1.…”

Section: Resultsmentioning

confidence: 99%

Novel Chromatic Technique Based on Optical Absorbance in Characterizing Mineral Hydraulic Oil Degradation

Ossia

Kong

2012

Advances in Tribology

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A low cost, compact, real-time, and quick measurement optical device based on the absorbance of white light, which comprised of photodiodes in a 3-element color-sensor, feedback diodes, water and temperature sensing element, and so on, was developed and tested in low absorption mineral oil. The device, a deviation from conventional electrical, mechanical, and electrochemical techniques, uses color ratio (CR) and total contamination index (TCI) parameters based on transmitted light intensity in RGB wavelengths for oil condition monitoring. Test results showed that CR corroborated CIE chromaticity (- Coordinates) and increased with oil degradation unlike Saturation and Hue . CR was found to be independent of the particulate contaminants of oil, but dependent on chemical degradation. TCI depended on both chemical degradation and particulate contaminants in oil, being most sensitive in the blue wavelength range and least in the green. Furthermore, results agreed with those of viscometry, total acid number (TAN), and UV-VIS photospectrometry. CR and TCI gave clearer indication of oil degradation than key monitoring parameters like TAN and were found to be effective criteria for characterizing the degradation of hydraulic mineral oils.

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“…The ultraviolet spectral range was successfully exploited by a commercially-available instrument which is capable of verifying the authenticity of commercial brands [10][11], while chromatic analyses extending to the visible were also experimented [12][13]. More recently, the mid-infrared spectral range provided a means for detecting counterfeit samples [14].…”

Section: Whisky and Brand Protectionmentioning

confidence: 99%

Optical spectroscopy and pattern recogition techniques for discriminating and classifying Scotch whiskies

Mignani

Ciaccheri

Mencaglia

et al. 2011

2011 IEEE SENSORS Proceedings

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The present study shows how optical spectroscopy can be innovatively used as a rapid and non-destructive tool to differentiate distinctive single malt Scotch whiskies with respect to commercial-grade blends, and for their classification according to the region of production. Absorption and fluorescence spectroscopy were combined with multivariate data analysis so as to build a discriminating map. The map showed that the clusters representing the single malt whiskies from selected distilleries were sharply separated from the cluster grouping the other whiskies of commercial-grade. Moreover, the cluster of single malt whisky was split into two subgroups, representing samples from two main macro-areas, the islands and the highlands, respectively.

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Chromatic signatures of broadband optical spectra for liquor discrimination

Cited by 13 publications

References 12 publications

Identification and quantification of furanic compounds in tequila and mezcal using spectroscopy and chemometric methods

Identification and quantification of furanic compounds in tequila and mezcal using spectroscopy and chemometric methods

Novel Chromatic Technique Based on Optical Absorbance in Characterizing Mineral Hydraulic Oil Degradation

Optical spectroscopy and pattern recogition techniques for discriminating and classifying Scotch whiskies

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