POLYSACCHARIDES OF THE AERIAL PARTS OF TRIBULUS TERRESTRIS GROWING IN UZBEKISTAN

Polysaccharide components were isolated from the aerial part of Tribulus terrestris, including 7.7% water-soluble polysaccharides, 6.5% pectins and 13.4% hemicellulose. Analysis of the monosaccharide composition revealed the absence of mannose in any of the constituent polysaccharides. The major monosaccharides of the water-soluble polysaccharides were galactose, glucose and arabinose, together with traces of xylose and 25–30% uronic acid. For the purified polysaccharide, the monosaccharide composition consisted of arabinose, glucose and galactose in a ratio of 1 : 2.2 : 3.3. The pectins extracted from the aerial part of Tribulus terrestris were cream-coloured with a yellowish tinge. These pectins were characterised by a high content of galactose, glucose, arabinose, rhamnose, traces of xylose and 50% uronic acid. It was found that the pectins from the aerial part of Tribulus terrestris are highly esterified (the degree of esterification (λ) is 88.0%), with the main chain composed of α-1,4-galacturonan, with the neutral sugars occupying a peripheral position with respect to the main chain. The monosaccharide composition of the two hemicelluloses indicates the presence of galactose, glucose, arabinose, xylose, rhamnose and 55–60% uronic acid.

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