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Title

Picrocrocin kinetics in aqueous saffron spice extracts (Crocus sativus L.) upon thermal treatment

AuthorsSánchez, Ana; Carmona, Manuel ; Jarén-Galán, Manuel ; Mínguez Mosquera, María Isabel ; Alonso, Gonzalo L.
KeywordsPicrocrocin
Saffron (Crocus sativus L.)
Kinetics
Safranal
Degradation
Issue Date12-Jan-2011
PublisherAmerican Chemical Society
CitationJournal of Agricultural and Food Chemistry 59(1): 249-255 (2011)
AbstractThe kinetics of picrocrocin degradation in aqueous extracts of saffron upon thermal treatment from 5 to 70 °C have been studied, together with the degradation of purified picrocrocin in water at 100 °C. The best fits to experimental data were found for a second-order kinetics model. Picrocrocin showed high stability with half-life periods (t1/2) ranging from >3400 h at 5 °C in saffron extracts to 9 h in the experiments with purified picrocrocin at 100 °C. In saffron extracts, the evolution of the rate constant (k) with temperature showed maximum values at 35 °C, and filtration of the extracts contributed to picrocrocin stability. In the case of purified picrocrocin, the generation of safranal in the first 5 h (yield up to 7.4%) was confirmed. Spectrometric parameters used in saffron quality control (E1cm1% 257 nm and Δpic) were not appropriate for documenting the evolution of picrocrocin. © 2010 American Chemical Society.
URIhttp://hdl.handle.net/10261/53715
DOI10.1021/jf102828v
Identifiersdoi: 10.1021/jf102828v
issn: 0021-8561
e-issn: 1520-5118
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