Efficiency of combinative salicylic acid and chitosan preharvest-treatment on antioxidant and phytochemicals of ready to eat daikon sprouts during storage

摘要

Effects of salicylic acid (SA), chitosan and combinative SA and chitosan (SA+ Chitosan) preharvest-treatments on bioactive compounds improvement of daikon sprouts during cold storage (5 +/- 1 degrees C) were investigated. In preliminary experiment, 2.0mM SA and 0.1% chitosan treatments were best concentration in improving antioxidant activity and bioactive compounds of the sprouts during storage. In the main experiment, the effects of SA+ Chitosan treatment on visual appearance, antioxidant activity, phytochemicals and antioxidant enzymes of the sprouts were monitored during storage. Visual appearance and pigments contents did not significantly change throughout storage. SA+ Chitosan treated sprouts contained total phenols, ascorbic acid, antioxidant enzymes and antioxidant activity higher that control. Compared to SA and chitosan, SA + Chitosan enhanced total phenols, ascorbic acid, catalase activity and free radical scavenging activity during storage. In conclusion, SA + Chitosan could be a good mean enhancing phytochemicals of daikon sprouts during cold storage.