Development of a reliable extraction and quantification method for glucosinolates in Moringa oleifera.

Abstract:

:Glucosinolates are the characteristic secondary metabolites of plants in the order Brassicales. To date the common DIN extraction 'desulfo glucosinolates' method remains the common procedure for determination and quantification of glucosinolates. However, the desulfation step in the extraction of glucosinolates from Moringa oleifera leaves resulted in complete conversion and degradation of the naturally occurring glucosinolates in this plant. Therefore, a method for extraction of intact Moringa glucosinolates was developed and no conversion and degradation of the different rhamnopyranosyloxy-benzyl glucosinolates was found. Buffered eluents (0.1 M ammonium acetate) were necessary to stabilize 4-α-rhamnopyranosyloxy-benzyl glucosinolate (Rhamno-Benzyl-GS) and acetyl-4-α-rhamnopyranosyloxy-benzyl glucosinolate isomers (Ac-Isomers-GS) during HPLC analysis. Due to the instability of intact Moringa glucosinolates at room temperature and during the purification process of single glucosinolates, influences of different storage (room temperature, frozen, thawing and refreezing) and buffer conditions on glucosinolate conversion were analysed. Conversion and degradations processes were especially determined for the Ac-Isomers-GS III.

journal_name

Food Chem

journal_title

Food chemistry

authors

Förster N,Ulrichs C,Schreiner M,Müller CT,Mewis I

doi

10.1016/j.foodchem.2014.06.043

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

456-464

eissn

0308-8146

issn

1873-7072

pii

S0308-8146(14)00929-7

journal_volume

166

pub_type

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