The aim of this work was to investigate the reaction kinetics of beta-carotene in an aqueous medium as a function of exposure to commercial lights (halogen and fluorescent sources) and oxygen partial pressures. The evolution of the pigment concentration, the changes in color and the accumulation of a volatile compound (beta-ionone) were monitored during storage. The kinetics of degradation were mathematically modeled in order to compare the effects of lighting conditions and oxygen partial pressures. Lighting was a critical variable also in the presence of a low oxygen partial pressure (5 kPa) and in these conditions the beta-carotene degraded completely during storage, even if more slowly than at 20 kPa of O2. The pigment degradation was correlated to illuminance and UVA irradiance values but the different decay rates of the fluorescent lamps were explained by the differences in the blue region of the energy emission spectra. Halogen lamp gave the minor negative effects on beta-carotene degradation.
Light-induced changes in an aqueous betha-carotene system stored under halogen and fluorescent lamps, affected by two oxygen partial pressures / S. Limbo, L. Torri, L. Piergiovanni. - In: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY. - ISSN 0021-8561. - 55:13(2007), pp. 5238-5245.
Light-induced changes in an aqueous betha-carotene system stored under halogen and fluorescent lamps, affected by two oxygen partial pressures
S. LimboPrimo
;L. TorriSecondo
;L. PiergiovanniUltimo
2007
Abstract
The aim of this work was to investigate the reaction kinetics of beta-carotene in an aqueous medium as a function of exposure to commercial lights (halogen and fluorescent sources) and oxygen partial pressures. The evolution of the pigment concentration, the changes in color and the accumulation of a volatile compound (beta-ionone) were monitored during storage. The kinetics of degradation were mathematically modeled in order to compare the effects of lighting conditions and oxygen partial pressures. Lighting was a critical variable also in the presence of a low oxygen partial pressure (5 kPa) and in these conditions the beta-carotene degraded completely during storage, even if more slowly than at 20 kPa of O2. The pigment degradation was correlated to illuminance and UVA irradiance values but the different decay rates of the fluorescent lamps were explained by the differences in the blue region of the energy emission spectra. Halogen lamp gave the minor negative effects on beta-carotene degradation.File | Dimensione | Formato | |
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