Objective: (1) To isolate the chemical constituents of the butanol fraction and ethyl acetate fraction from Seed Melon; (2) We preliminarily discussed about the antifungal activities of the extract from different parts of the from Seed Melon , which provided the basis for the research and development of the active ingredient of the Seed Melon.
Methods: (1) The chemical composition of the butanol fraction and ethyl acetate parts of Seed Melon were studied by using ethanol re-flux method, extraction method, isolated by column chromatography with silica gel, Sep-hadex LH-20 column chromatogra-phy, recrystallisation and HPLC. The structures of the separated compounds were identified by physical-chemical methods and spectral dat-a such as HR-ESI-MS、1D NMR (1H NMR、13C NMR)、2D NMR (1H-1H COSY、HSQC、HMBC); (2) Conducted to investigate the antibacterial activities of he extactrs from different parts of Seed Melon by using K-B paper dispersion method and dilution method.
Results:
(1) six compounds were isolated from the n-butanol extraction separation of 95% ethanol extract of include:3-hydroxy-4-(β-D-glucopyranosyloxy)benzyl]2,3-dihydroxy-3-methylbutanoate(1),p-hydroxyb-
enzoyl-β-D-glucopyranoside(2),[4-(β-D-glucopyranosyloxy)benzyl]2,3-dihydroxy-3-methylbutanoate(3),1-(2'-Deoxy-β-D-erythro-pentofuranosyl)-1H-1,2,4-triazone(4),4-(β-D-glucopyranosyloxy) Benzyl alcohol (5), β-adenosine (6).
(2) fourteen compounds were isolated from the ethyl acetate extraction separation of 95% and 70% ethanol extract include:4-hydroxymet-hyl-2-methoxyphenyl 1-O-β-D-[6'-O-(4″-hydroxybenzoyl)-glucopyranoside (1), uracil (2), thymine (3), 2'-deoxythymidine (4), 7,8-dimethylalloxazine(5),indole-3-carboxylic acid (6),β-adenosine (7), 4-hydroxybenzoic acid (8), p-coumaric acid (9), Cucumegasti-gmanesⅠ (10), 3′-methoxyl-quercetin-7-O-β-D-glucopyranoside (11), 3,3′-dimethyloxy-4,4′- dihydroxy-9,9′-monoepoxy lignan (12), aralia cerebroside (13), lanatusosides B (14).
(3) The extracts of the petroleum ether, the ethyl acetate and the n-butanol had certain inhibitory effect on Staphylococcus aureus and Escherichia coli, and the antibacterial effect was enhanced with the increase of the concentration of the extract.
Conclusions:
(1) six compounds were isolated from Seed melon for the first time, Which provide a reference for chemical taxonomy of this genus. Among them, compound 1 and 3 is a new structural compound, 4 are phenols, 2 are alkaloids. the compounds are firstly isolated from the plants of the genus watermelon, provides a reference for plant chemotaxonomy.
(2) fourteen compounds were isolated from Seed melon for the first time, Which provide a reference for chemical taxonomy of this genus. Among them, compound 1 and 14 is a new structural compound, 1 is phenols, 1 is terpenes, 6 are alkaloids, 1 is phenylpropanoids, 2 is phenolic acids, 1 is flavonoids, 1 is lignans, 1 is nerve glycosphingolipids. the compounds are firstly isolated from the plants of the genus watermelon, provides a reference for plant chemotaxonomy.
(3) Different parts of the extract of Seed Melon have a certain inhibitory effect with Staphylococcus aureus and Escherichia coli.