국내육성 품종 ‘하례조생’의 생리활성 성분과 항산화 활성

Abstract

A new early maturing satsuma mandarin (Citrus unshiu Marc.) ‘Haryejosaeng’ was developed at the Citrus Research Institute, Korea. The present study investigated the variation in total phenolics (TP), flavonoid, and antioxidant activity of fruits of ‘Haryejosaeng’ according to the harvest from September 2018 to December 2018, in Jeju. Colorirmetric methods were employed for the quantitative TP analysis, and the antioxidant activity by in vitro assay methods for DPPH, ABTS, hydroxyl radical, superoxide anion radical, nitric oxide, and hydrogen peroxide. The flavonoid and carotenoid compositions of ‘Haryejosaeng’ were compared with HPLC method. The total phenolics contents, flavonoid, antioxidant activity in both peel and flesh of ‘Haryejosaeng’ decreased during ripening. However, the amounts of β-cryptoxanthin in flesh increased from 0.2 to 1.86 mg/100 g during ripening. The major flavonoids of ‘Haryejosaeng’ extract were narirutin, hesperidin, rutin, nobiletin, and tangeretin. The changes observed for the antioxidant activity of ‘Haryejosaeng’ was correlated with the content of flavonoid and phenolics which can indicate that these compounds may act by capturing free radicals. Therefore, these results suggest that fruits of ‘Haryejosaeng’ are a significant source of antioxidant compounds such as phenolics, flavonoid and β-cryptoxanthin. These finding will allow the determination of appropriate times for harvesting Haryejosaengs containing the highest amount of specific bioactive makers for achieving improved health benefits and functional properties.