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Isolation and Identification of Bioactive Compounds from the Tuber of Brassica oleracea var. gongylodes

  • Prajapati, Ritu (Department of Food and Life Science, Pukyong National University) ;
  • Seong, Su Hui (Department of Food and Life Science, Pukyong National University) ;
  • Kim, Hyeung Rak (Department of Food and Life Science, Pukyong National University) ;
  • Jung, Hyun Ah (Department of Food Science and Human Nutrition, Jeonbuk National University) ;
  • Choi, Jae Sue (Department of Food and Life Science, Pukyong National University)
  • Received : 2020.05.28
  • Accepted : 2020.08.18
  • Published : 2020.09.30

Abstract

Brassica oleracea var. gongylodes (red kohlrabi) is a biennial herbaceous vegetable whose edible bulbotuber-like stem and leaves are consumed globally. Sliced red kohlrabi tubers were extracted using methanol and the concentrated extract was partitioned successively with dichloromethane (CH2Cl2), ethyl acetate (EtOAc), n-butanol (n-BuOH) and water (H2O). Repeated column chromatography of EtOAc fraction through silica, sephadex LH-20 and RP-18 gel led to isolation of eleven compounds of which compound 1 was a new glycosylated indole alkaloid derivative, 1-methoxyindole 3-carboxylic acid 6-O-β-D-glucopyranoside. Others were known compounds namely, β-sitosterol glucoside (4), 5-hydroxymethyl-2-furaldehyde (5), methyl-1-thio-β-D-glucopyranosyl disulfide (6), 5-hydroxy-2-pyridinemethanol (7), (3S,4R)-2-deoxyribonolactone (8), n-butyl-β-D-fructopyranoside (9), uridine (10) and three fructose derivatives, D-tagatose (11), β-D-fructofuranose (12) and β-D-fructopyranose (13). Similarly, isolation from CH2Cl2 fraction gave two known indole alkaloids, indole 3-acetonitrile (2) and N-methoxyindole 3-acetonitrile (3). The structure elucidation and identification of these compounds were conducted with the help of 13C and 1H NMR, HMBC, HMQC, EIMS, HR-ESIMS and IR spectroscopic data, and TLC plate spots visualization. Compounds 2, 3, 4, 5, 6, 7, 8 and 9 are noted to occur in kohlrabi for the first time. Different bioactivities of these isolated compounds have been reported in literature.

Keywords

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