Determination of quality and adulteration of tequila through the use of surface plasmon resonance

In this work, the surface plasmon resonance (SPR) technique is used to determine the quality or adulteration of tequila beverages. Graphic analyses of the position and width of the SPR curve are related to the complex refractive index of the sample, showing differentiated regions where one can easil...

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Bibliographic Details
Published in:Applied optics (2004) 2012-07, Vol.51 (21), p.5161-5167
Main Authors: Luna-Moreno, D, Monzón-Hernández, D, Noé-Arias, E, Regalado, L E
Format: Article
Language:English
Subjects:
Beverages
Fluctuation
Plasmons
Refractive index
Refractivity
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Summary:In this work, the surface plasmon resonance (SPR) technique is used to determine the quality or adulteration of tequila beverages. Graphic analyses of the position and width of the SPR curve are related to the complex refractive index of the sample, showing differentiated regions where one can easily and unambiguously identify white, aged, or extra-aged tequilas, and even adulterated or low quality tequilas. The curves generated by aged and extra-aged tequilas, with respect to those obtained from white tequilas, are wider, while the resonant peak shifts towards larger angles. This behavior should be attributed to the aging process. The resonance curve is generated in 20 s, minimizing the variations of the SPR curve parameters due to temperature fluctuations.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.51.005161