บทคัดย่องานวิจัย

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Photobleaching, light-induced carotenoid degradation in red hot peppers.

Jung J.W., Lee S.K.

5th International Postharvest Symposium . Volume of Abstract . Verona, Italy 6-11 June 2004, p.86

2004

บทคัดย่อ

Photobleaching, light-induced carotenoid degradation in red hot peppers. The discoloration in pericarp of red hot pepper was observed as a result of exposure to high light and wet condition during sun drying.Bleaching mechanism was studied under simulated irradiation condition using the pericarp discs in MES-sucrose solution under halide lamp.When red hot pepper pericarp discs were floated o­n MES-sucrose solution under light or dark condition, electrolyte leakage occurred in discs exposed to light at the time when carotenoids were exhausted and fruit looked white.

Increase of malondialdehyde (MDA) level preceded electrolyte leakage in discs exposed to light.In contrast, no significant electrolyte leakage and MDA was detected in the dark treatment.Carotenoid degradation was markedly suppressed by the presence of ascorbic acid as a quencher of reactive oxygen species (ROS).The results suggest that carotenoid in red hot pepper may play a role in protecting the pericarptissue against sunlight damage by eliminating ROS generated from certain endogenous photosensitizers, resulting in surface bleaching.