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

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1396/09/13
95
0

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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