Antioxidant Activity According to the Planting Interval and Collecting Time of Rosa davurica

Abstract

This study aimed to assess functional substances and antioxidant effects with respect to planting intervals and collection timing, with the goal of developing efficient planting methods for the mass harvesting of Rosa davurica and enhancing the availability of the plant’s edible parts in Korea. High-Performance Liquid Chromatography (HPLC) was employed to analyze the ethyl gallate content, a recognized functional component present in R. davurica, while the antioxidant effect was verified using DPPH, ABTS, and SOD assays. The findings revealed an increased yield of buds and leaves in R. davurica when the planting interval was reduced to 120 × 50 cm compared to the conventional 120 × 100 cm spacing. Specifically, the content of ethyl gallate remained consistent across different collection periods, and this result was associated with the varying planting intervals. While there were no significant changes in total polyphenol and flavonoid content, the collection from September demonstrated higher levels. Furthermore, the study established that leaf antioxidant activity, determined through IC50 values of DPPH and ABTS, surpassed that of the buds, with no significant difference in SOD activity being observed. Overall, no substantial differences were observed in the content of functional components between the buds and leaves of R. davurica, regardless of planting interval and collection timing. These results contribute valuable insights for optimizing planting methods for the large-scale collection of R. davurica leaves.