Arabinan and arabinan-rich pectic polysaccharides from quinoa (Chenopodium quinoa) seeds- Structure and gastroprotective activity

مقالات خارجی


Food Chemistry 130 (2012) 937–944

After removal of starch, cell wall polysaccharides of seeds of quinoa were studied. They were extracted
successively with water and with aq. 10% KOH. The extracted polysaccharides were fractionated and
purified by freeze–thaw treatment and by sequential ultrafiltration through membranes. The purified
fractions (PQW, K2-30EM, K1-10RM and K1-30RM) were analyzed by sugar composition, HPSEC, methylation
and 13C NMR spectroscopy analysis. The results showed that PQW consisted of a linear arabinan
with (1?5)-linked a-L-arabinofuranosyl units. Fractions K2-30EM, K1-10RM and K1-30RM were related
to rhamnogalacturonan type I with a branched arabinan and galactan side-chains. This arabinan has
(1?5)-linked a-L-arabinofuranosyl units substituted exclusively in O-3. The main differences between
these fractions were their molecular mass and content of Rha and GalA, which probably arise from an
increase in their rhamnogalacturonan backbone. A pool of these polysaccharides (arabinan and arabinan-
rich pectic polysaccharides) showed gastroprotective activity on ethanol-induced acute gastric
lesions in rats.

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