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This study investigated the microbiological and nutritional characteristics of bimonthly radish sprouts purchased at a local market. The total bacteria and coliform measurements were highest in summer (June and August) and lowest in winter (February and December). The total phenol content was , and it did not significantly differ during the investigation period. The total carotenoid contents were highest in February (about -carotene mg/g) and lowest in April (about -carotene mg/g). However although total glucosinolates content differ between the total crude glucosinolate and the sum of the individual glucosinolates, it was highest in December. The individual glucosinolates were found to have been gucoraphenin, glucoerucin, glucobrassicin and gluconasturtiin in radish sprouts via HPLC analysis. The purchasing time of the glucoraphenin content did not significantly differ. The measured glucoerucin was highest in February and lowest in October. The gucobrassicin and gluconasturtiin were higher in summer than in winter, but did not significantly differ. The antioxidant activity (i.e., the values of the DPPH radical scavenging) was highest in February. In conclusion, the microbial contamination, total carotenoids, and antioxidant activity changed according to the purchasing season, but the total phenolic compounds and total glucosinolates were maintained regardless of the time in the radish sprouts.

Comparison of the microbial and nutritional quality characteristics in radish sprouts by purchasing time