Abstract
The purpose of this study was to preliminary investigate the extraction condition and composition of purified pectin from pulp in pods of Riang (Parkia timoriana (DC.) Merr.), a native tree in southern Thailand. Dry pulp of Riang was extracted using water or citric solvent at different concentrations under the same condition (90 ℃ for 2 h). It was found that the highest yield of pectin (21.6 % dry basis) was obtained by hot water extraction with an esterification degree of 48.3 %. It mainly contained 62.3 % galacturonic acid, followed by 18.5 % total sugar. The monosaccharides found in pectin were arabinose (2.6 %), galactose (2.3 %), glucose (1.5 %), mannose (0.5 %), fructose (0.5 %) and xylose (0.1 %). The finding pectin had a high average molecular weight of 2,070 KDa with a broad polydispersity index of 4.31, determined by high performance size exclusion chromatography (HPSEC) and it was classified as low methoxyl pectin confirmed by Fourier transform infrared spectroscopy (FT-IR) and rheological properties.
 HIGHLIGHTS
 
 Pectin from Riang pulp was low methoxyl pectin
 This pectin was water extractable and showed a high yield of 21.6 % (dry basis)
 It had high molecular weight with broad polydispersity index.
 
 GRAPHICAL ABSTRACT
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