Effect of Gamma-irradiation on Marigold (Tagetes erecta l.) Cut Flowers: Changes in Sensory and Physicochemical Properties and Lutein Content
Keywords:
Gamma-irradiation, Low density polyethylene Lutein, Marigold, Shelf-lifeAbstract
Marigold flowers packaged in low density polyethylene (LDPE) were subjected to gamma irradiation in the dose range of 0.02-2.5 kGy and stored in an environmental chamber (23±2°C, 80% R.H.) along with positive (non irradiated LDPE packaged flowers) and negative control (non-packaged, non irradiated flowers) sets for evaluation of their shelf-lives. Assays of sensory and physicochemical parameters of senescence revealed that flowers irradiated at 2.3 kGy had the highest shelf-life of 11 days, with a lead of 5 and 7 days vis-à-vis positive and negative controls, respectively. This study established for the first time the phenomenon of carotenogenesis (synthesis of ‘lutein’) in both irradiated and non-irradiated marigold flowers, with highest production and preservation of lutein in 2.3 kGy irradiated flowers. Thus gamma irradiation can boost the export potential of this flower, both for its ornamental and therapeutic value.
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