Structural and water-holding characteristics of untreated and ensiled chicory root pulp

U. Ramasamy, H. Gruppen, H.A. Schols

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)

Abstract

Cell wall polysaccharides (CWPs) from chicory root pulp (CRP) and the effect of ensiling on CWP structure to reduce the water-holding capacity (WHC) were studied. Sequential extractions of CRP showed that hot water extraction solubilized arabinan-rich pectin and inulin, each representing 6% of all CRP sugars. A significant amount of pectic sugars (46%) rich in uronic acid from CRP was solubilized by chelating agents. Both dilute alkali extraction, which solubilized branched pectin (14% from CRP), and concentrated alkali extraction, which solubilized hemicellulose dominant in yloglucans (2.5%) mostly of the XXXG type and mannan (0.9%), from CRP CWPs seemed to influence the WHC of CRP. Alkali-insoluble residue (39% of CRP sugars) mainly comprised cellulose and some branched pectin (17% from CRP). Ensiling reduced the methyl esterification of pectin, caused degradation of homogalacturonan and rhamnogalacturonan, and possibly modified the xyloglucan, mannan, and glucan network, reducing the WHC from 6 mL/g to 3.4 mL/g.
Original languageEnglish
Pages (from-to)6077-6085
JournalJournal of Agricultural and Food Chemistry
Volume61
Issue number25
DOIs
Publication statusPublished - 2013

Keywords

  • cell-walls
  • nonstarch polysaccharides
  • liquid-chromatography
  • by-products
  • xyloglucan
  • cellulose
  • pectins
  • fiber
  • purification
  • substances

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