Determination of Methanol in Alcoholic Beverages by Two-Dimensional Near-Infrared Correlation Spectroscopy

Yang, Yong; Ren, Yufen; Dong, Guimei; Yang, Ran; Liu, H. X.; Du, Yanhong; Zhang, W. Y.

doi:10.1080/00032719.2016.1144060

Cited by 19 publications

(18 citation statements)

References 29 publications

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“…These conditions coincide with other authors (Ozturk et al, 2012;Sharma et al, 2009). The optimal conditions to obtain the NIR spectra were: 4 cm −1 spectral resolution and 32 co-added scans, the above coincides with Yang et al (2016). Figure 2 shows the spectra of mezcal classes in both infrared regions.…”

Section: Ft-mir and Ft-nir Spectrasupporting

confidence: 82%

Quantification of adulterants in mezcal by means of FT-MIR and FT-NIR spectroscopy coupled to multivariate analysis

Arenas

Meza-Márquez

Velázquez-Hernández³

et al. 2020

CyTA - Journal of Food

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Mezcal is an alcoholic beverage with a high commercial value and is often adulterated to obtain economical profit, however, adulteration is an illegal practice that can damage consumer's health. FT-MIR and FT-NIR spectroscopy along with multivariate analysis were used to quantify adulterants (water, ethanol, methanol) in three mezcal classes (white, rested, aged). Calibration models were constructed using principal component regression (PCR), partial least squares with single y-variable (PLS1) and partial least squares with multiple y-variables (PLS2) algorithms. The PLS2 showed the best predictive results for FT-MIR (R 2 = 0.9579-0.9895); and PLS1 for FT-NIR (R 2 = 0.9401-0.9665). The predictions of models were compared to gas chromatography with flame ionization detector (GC-FID) and no significant difference was found (p ≤ 0.05). Results show that the authenticity of mezcal can be verified through FT-MIR and FT-NIR spectroscopy coupled to multivariate analysis because it is reliable and fast (as compared to GC-FID). Cuantificación de adulterantes en mezcal mediante espectroscopia FT-MIR y FT-NIR acoplada al análisis multivariante RESUMEN El mezcal es una bebida alcohólica con alto valor comercial que comúnmente se adultera para obtener beneficios económicos, sin embargo, esto es ilegal y puede dañar la salud de los consumidores. FT-MIR y FT-NIR junto con el análisis multivariante se utilizó para cuantificar adulterantes (agua, etanol, metanol) en tres clases de mezcal (blanco, reposado, añejo). Los modelos de calibración se construyeron con los algoritmos de Regresión de Componentes Principales (PCR), Mínimos Cuadrados Parciales con una variable (PLS1) y Mínimos Cuadrados Parciales con múltiples variables (PLS2). PLS2 mostró las mejores predicciones en FT-MIR (R 2 = 0.9579-0.9895); y PLS1 en FT-NIR (R 2 = 0.9401-0.9665). Los resultados se compararon con cromatografía de gases con detector de ionización de llama (CG-FID) y no presentaron diferencia significativa (p ≤ 0.05). La autenticidad del mezcal se puede verificar con FT-MIR y FT-NIR acoplada al análisis multivariante ya que es confiable y rápida (en comparación con CG-FID).

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Section: Ft-mir and Ft-nir Spectrasupporting

confidence: 82%

Quantification of adulterants in mezcal by means of FT-MIR and FT-NIR spectroscopy coupled to multivariate analysis

Arenas

Meza-Márquez

Velázquez-Hernández³

et al. 2020

CyTA - Journal of Food

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“…The near infrared spectra of the samples were obtained according the methodology proposed by Yang et al [23], in a NIR spectrometer (MPA Bruker) using transmitted light, collected in 1 mm quartz cells at 25 • C for 2 min in the instrument before scanning and using air as a background. The samples were measured with a spectral resolution of 8 cm −1 and 32 scans in the wavenumber from 12,500 to 4000 cm −1 .…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

“…Nordon et al [19] compared NIR and Raman spectrometry to evaluate the alcohol strength of whiskies, vodkas and other alcoholic drinks. NIR has also been used to determine the alcohol and methanol contents or other constituents of whiskies [19,20], gin, vodka [21], rum, brandies [22] and other distilled beverages [14,22,23]. Research on aged wine spirits and brandies using NIR is scarce; as far as we know, there was only one study on wine spirit.…”

Section: Introductionmentioning

confidence: 99%

Screening of Different Ageing Technologies of Wine Spirit by Application of Near-Infrared (NIR) Spectroscopy and Volatile Quantification

et al. 2020

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The traditional ageing of wine spirits is done in wooden barrels, however, high costs have led to the search for alternative technologies, such as the use of stainless steel tanks with wooden staves and the application of micro-oxygenation. This work evaluates the changes in the major volatile compounds of wine spirits aged for 6, 12 and 18 months in wooden barrels and stainless steel tanks with micro-oxygenation. For both ageing technologies, two types of wood (Limousin oak and Portuguese chestnut wood) were used. The samples were analysed concerning their alcohol strength (electronic densimetry) and volatile composition, namely of methanol, acetaldehyde, ethyl acetate and other major volatile compounds ((GC-FID) and near-infrared spectroscopy (NIR)). The results show that the ageing technology was more influential than the wood species for the volatile composition of wine spirits, namely acetaldedehyde, methanol, 2-methylpropan-1-ol and 2+3-methylbutan-1-ol. However, the opposite behaviour was found for the spectral data. The ageing process was accelerated by using the alternative ageing technology, especially with chestnut wood staves. The most informative spectral regions to discriminate samples were around 6859 cm−1 and from 5200 cm−1 to 4200 cm−1. NIR is a promising technique to identify different technologies and different wood species used in the ageing process of wine spirits.

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“…Not surprisingly, therefore, considerable effort has been devoted to the problem of sensing methanol in the presence of ethanol and other potentially competing analytes 32 , 33 . Currently, physical techniques, such as gas chromatography 34 , Fourier transform infrared spectroscopy 35 , and Raman spectroscopy 36 , define the gold standard for methanol sensing. However, these methods rely on relatively expensive instrumentation.…”

Section: Introductionmentioning

confidence: 99%

Twisted-Planar-Twisted expanded porphyrinoid dimer as a rudimentary reaction-based methanol indicator

Baryshnikov

et al. 2020

Nat Commun

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Directly linked porphyrin dimers have attracted considerable attention because of their intriguing electronic features. Most emphasis has been placed on either dimers with large dihedral angles between the constituent planar monomeric subunits or those with overall planarity, referred to as “Planar-Twisted-Planar” and “Planar-Planar-Planar”, respectively. Herein, we report a “Twisted-Planar-Twisted” framework, the hexaphyrin dimer D that exists in a trans configuration. Treatment of D with MeOH affords two isomeric dimers, MD1 and MD2, both of which incorporate a methoxy moiety and exist in cis orientations with respect to the tethering linkage. The methanol-promoted conversion is accompanied by a readily discernible color change from green to brown and is not induced to an appreciable level by other alcohols. Dimer D thus acts as a rudimentary, albeit highly selective, reaction-based methanol indicator. This work provides a promising approach for constructing reaction-based chemosensors using porphyrinoid dimers of nonplanar subunits with biased reactivity.

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Determination of Methanol in Alcoholic Beverages by Two-Dimensional Near-Infrared Correlation Spectroscopy

Cited by 19 publications

References 29 publications

Quantification of adulterants in mezcal by means of FT-MIR and FT-NIR spectroscopy coupled to multivariate analysis

Quantification of adulterants in mezcal by means of FT-MIR and FT-NIR spectroscopy coupled to multivariate analysis

Screening of Different Ageing Technologies of Wine Spirit by Application of Near-Infrared (NIR) Spectroscopy and Volatile Quantification

Twisted-Planar-Twisted expanded porphyrinoid dimer as a rudimentary reaction-based methanol indicator

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