PECTIN SUBSTANCES OF CUCUMIS MELO PEEL

Cucumis melo, pectin, pectic acid, galacturonan, IR spectroscopy.

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The article is devoted to the isolation and study of the physicochemical properties of pectin substances (PS) of Cucumis melo peel, fam. Cucurbitaceae. The yield of PS from the peel is 5.0%. Monosaccharides were found in the hydrolysis products of the obtained pectin substances: glucose (1%) xylose (1.7%), rhamnose (1.8%), mannose (2.6%), galactose (4.4%), arabinose (44.6%) and uronic acids. Results of titrimetric analysis show that PS is highly esterified with a degree of esterification of 52.4%. Analysis of the IR spectra of pectin substances and their derivatives: pectic acid and galacturonane shows that the studied biopolymers are carboxypolysaccharides with a basic α-1→4 glycoside bond between the residues of D-galacturonic acid in the main chain, where the carboxyl groups are partially methylated

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