Relationship of phenolic, flavonoid contents and antioxidant during phenological variation in leaves of two Diospyros species
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Abstract
Study on phenolic, flavonoid, and antioxidant changes in leaves of Diospyros spp. during the growth and development of Diospyros kaki two cultivars and Kluai ruesee (Diospyros glandulosa) were determined. Mature leaves were collected from the period of phenological growth stages in the BBCH-scale total 6 stages (35, 71, 75, 85, 87, 93) during March to November 2019. The morphological characteristics and changes of phenolic, flavonoid, and antioxidant of leaves were analyzed in each growth and developmental stages to comparing between Diospyros kaki ‘Xichu’, ‘Fuyu’, and Diospyros glandulosa for the suitable utilized leaf products. Results showed that the leaf size of Diospyros kaki ‘Xichu’ and ‘Fuyu’ was bigger than the leaf of Kluai ruesee which had a slender shape. The analyzed leaf of Kluai ruesee had an efficiency of antioxidant activity better than ‘Xichu’ and ‘Fuyu’ from stage 73 - 91 which a period of fruit set to the onset of dormancy tree. The changes of phenolic, flavonoid, and antioxidant were found to relate a year-around growth of leaves. Correlations between phenolic and flavonoid contents were positive, whereas showed the negative relationship was recorded for between IC50 : phenolic content and IC50 : flavonoid content. Therefore, increasing of phenolic and flavonoid contents in leaves followed to the high antioxidant. The decisions on persimmon species, and growth stage for leaf harvesting affect the benefits of health products.
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References
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