Aging spectral markers of tequila observed by Raman spectroscopy
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In this work, were studied the aging spectral markers of three types of tequila: Blanco, Reposado, and Añejo (white, rested, and aged, respectively) by Raman spectroscopy with the aim of qualitatively assessing the aging state of tequilas. The samples were elaborated in the same distillery to increase the correctness of the analysis since the contribution of manufacturing process factors, e.g., the type of water used for the elaboration, the origin of raw materials like agaves, sugar, barrels, and others would be similar for all the kinds of tequila. It was demonstrated that complementary information can be obtained through the employment of two excitation wavelengths: 532 and 785 nm. Fluorescence intensity increases with the aging degree of the tequilas as observed with the 532 nm line providing qualitative information about the resting time within the barrels. Additionally, by employing the 785 nm line it was possible to discern through the νs-CCO νa-CCO bands, (C–O) and (C–H) stretching modes and CH2 wagging bonds, the aging spectral markers of tequila.
KeywordsTequila Raman spectroscopy Cask aging Beverage maturation
The authors acknowledge the financial support from CEMIE-SOL 22, FRC-UASLP and CONACYT-Mexico through Grants: INFR-2015-01-255489, CB 2015-257358 and PNCPN2014-01-248071. Special thanks to “Rancho Palos Colorados” the distillery of “Tequila el Charro” for the information provided to the authors to complete the work presented here.
Compliance with ethical standards
Conflict of interest
Author L. I. Espinosa-Vega declares that she has no conflict of interest. Author A. Belio-Manzano declares that he has no conflict of interest. Author C. A. Mercado-Ornelas declares that he has no conflict of interest. Author I. E. Cortes-Mestizo declares that he has no conflict of interest. Author Victor H. Mendez-Garcia declares that he has no conflict of interest.
Compliance with ethics requirements
This article does not contain any studies with human or animals subjects.
Not applicable as this study does not include any human participants.
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