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Effect of Plant Part, Extraction Method, and Harvest Time over Antioxidant Yield of Rubus coreanus

Authors
Lee, Min JuNam, Ju HeeJeong, Ho JeongRho, Il Rae
Issue Date
Jul-2020
Publisher
Medknow Publications
Keywords
Antioxidants; extract method; leaves; Rubus coreanus; solvent fraction
Citation
Pharmacognosy Magazine, v.16, no.5, pp S455 - S461
Indexed
SCIE
SCOPUS
Journal Title
Pharmacognosy Magazine
Volume
16
Number
5
Start Page
S455
End Page
S461
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/6430
DOI
10.4103/pm.pm_549_19
ISSN
0973-1296
0976-4062
Abstract
Background: Immature fruit of Rubus coreanus, also known as "Bokbunja" in Korea, have been used as traditional medicinal plant in East-Asia. Although several studies have been conducted to the fruit composition of R. coreanus, research on the antioxidant composition of branch and leaves are limited. Objectives: We aimed to analyze the contents of five antioxidants in leaves and branches of R. coreanus using different extraction method. Materials and Methods: R. coreanus were cultivated at the research farm of the Gyeongsang National University. R. coreanus plants were harvested in May and July, and leaf and branch extracts were prepared using the ultrasonic bath and reflux extraction methods and analyzed using liquid chromatography-tandem mass spectrometry. Results: The ultrasonic bath extraction method extracted 7.1 and 1.5 mg/100 g gallic acid from leaves and branches, respectively, whereas the reflux extraction method yielded 12.4 and 16.5 mg/100 g, respectively. Thus, reflux extraction was superior to ultrasonic bath for both leaf and branch parts. In the extracts prepared by reflux extraction, contents of all five compounds were higher in leaves than in branches. In leaves extracted with the reflux extraction method, ellagic acid was the most abundant, followed by quercetin-3-O-glucoside (24.7 mg/100 g), gallic acid (12.4 mg/100 g), quercetin (7.3 mg/100 g), and kaempferol (1.5 mg/100 g). Contents of all compounds were higher in May (1.1 mg/g) than in July (0.7 mg/g). Conclusion: R. coreanus plant was identified to show antioxidant activity and to present abundantly five antioxidants not only in fruit but also in leaves and branches in May. Specially, quercetin was three-fold higher in leaves than in fruit juice.
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농업생명과학대학 (농학과)
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