ISHS Acta Horticulturae 650: I International Symposium on Saffron Biology and Biotechnology
KINETIC STUDY OF THE PHOTODECOLORATION OF THE SAFFRON |
| Authors: | M. del Rosario Haro, D. Escolar, C. Bueno, J. Ayuso |
| Keywords: | chromatic parameters, colour, crocine, photodescomposition |
| 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. | |
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