Articles
KINETIC STUDY OF THE PHOTODECOLORATION OF THE SAFFRON
Article number
650_38
Pages
313 – 319
Language
English
Abstract
UV/Vis spectroscopy was used to study the photodecoloration of the water-soluble fraction of saffron.
Based on the absorbance in the visible region, which peaks at 440 nm, the photodecomposition of the pigment crocin obeys a first-order kinetic law.
The photodecoloration process was also examined as a function of various CIE-L*a*b* chromatic parameters (particularly Chroma) that confirmed the first-order nature of the kinetics.
The Chroma of crocin can be related to the amount of pigment present in solution as its determination involves the use of absorbance data for the whole crocin band.
Based on the absorbance in the visible region, which peaks at 440 nm, the photodecomposition of the pigment crocin obeys a first-order kinetic law.
The photodecoloration process was also examined as a function of various CIE-L*a*b* chromatic parameters (particularly Chroma) that confirmed the first-order nature of the kinetics.
The Chroma of crocin can be related to the amount of pigment present in solution as its determination involves the use of absorbance data for the whole crocin band.
Authors
M. del Rosario Haro, D. Escolar, C. Bueno, J. Ayuso
Keywords
chromatic parameters, colour, crocine, photodescomposition
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