Abstract

Four steroids, 5α,8α-epidioxy-(24ξ)-ergosta-6,22-dien-3β-ol (1), β-sitosterol (2), β-sitostenone (3), and stigmastenone (4), along with 10 known compounds were isolated from the whole plants of Leucaena leucocephala (Leguminosae). 1, Lupeol (5), 1,3-dipalmitoyl-2-oleoylglycerol (6), methylparabene (8) and isovanillic acid (9) were found for the first time from the species. The structure of these compounds were characterized and identified by spectra analyses.

Highlights

  • Leucaena leucocephala (Leguminosae) is a small, leguminous and native to tropical America, widely distributed in southern Asia and neighboring islands [1]

  • 5α,8α-epidioxy-(24ξ)-ergosta-6,22-dien-3β-ol (1), β-sitosterol (2), β-sitostenone (3), and stigmastenone (4), along with 10 known compounds were isolated from the whole plants of Leucaena leucocephala (Leguminosae). 1, Lupeol (5), 1,3-dipalmitoyl-2-oleoylglycerol (6), methylparabene (8) and isovanillic acid (9) were found for the first time from the species

  • Previous studies have show that gallocatechin, epigallocatechin, catechin and epicatechin, extracted from the roots of L. leucocephala was found to exhibit the nitrification inhibition bioassay against the bacterium Nitrosomonas europaea [2]

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Summary

Introduction

Leucaena leucocephala (Leguminosae) is a small, leguminous and native to tropical America, widely distributed in southern Asia and neighboring islands [1]. 5α,8α-epidioxy-(24ξ)-ergosta-6,22-dien-3β-ol (1), β-sitosterol (2), β-sitostenone (3), and stigmastenone (4), along with 10 known compounds were isolated from the whole plants of Leucaena leucocephala (Leguminosae). Investigation on the MeOH extract of the plants has led to the isolation of 14 compounds, four steroids: 5α, 8α-epidioxy-(24ξ)-ergosta-6,22-dien-3β-ol (1) (Figure 1) [3], β-sitosterol (2) (Figure 2) [4], β-sitostenone (3) (Figure 3) and stigmastenone (4) (Figure 4) [5] ; one terpenoid: lupeol (5) [6]; one glyceride: 1,3-dipalmitoyl2-oleoylglycerol (6) [7]; one alkanoid: linoleic acid (7) [8]; two benzenoids: methylparabene (8) [9] and isovanillic acid (9) [10]; and five chlorophylls: pheophytin-a (10) [11], pheophorbide a methyl ester (11) [12], methyl-132- hydroxy-(132-S)-pheophorbide-b (12) [13], 132-hydroxy-(132-S)-pheophytin-a (13) [14] and aristophyll-C (14) [15].

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