title: Structural features and water holding capacities of pressed potato fibre polysaccharides.
abstract: Pressed potato fibre (PPF) has a high water holding capacity (WHC) affecting its processing as an animal feed. The aim of this study was to characterize cell wall polysaccharides (CWPs) in PPF and investigate their WHC. This was done via sequential extractions. Half of all CWPs were recovered in the hot buffer soluble solids extract as pectins (uronic acid and rhamnose) and galactans wherein most pectins (76%) from PPF were water soluble. Most likely, the network of CWPs is loosened during processing of potatoes. PPF showed a WHC of 7.4 expressed as the amount of water held per g of dry matter (mL/g). Reconstituting hot buffer soluble solids with buffer insoluble solids in water gave a WHC comparable to that of PPF. Removal of alkali soluble solids, which mainly comprised xyloglucans, lowered the WHC of the final residue. The results indicated that interactions between CWPs could affect the WHC of PPF.
authors.affiliation: Laboratory of Food Chemistry, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 8129, 6700 EV Wageningen, The Netherlands.
authors.forename: Urmila R
authors.initials: UR
authors.lastname: Ramaswamy
authors.forename: Mirjam A
authors.initials: MA
authors.lastname: Kabel
authors.forename: Henk A
authors.initials: HA
authors.lastname: Schols
authors.forename: Harry
authors.initials: H
authors.lastname: Gruppen
mesh_terms: D000468:Alkalies / Q000737:chemistry; D001692:Biological Transport; D001696:Biomechanical Phenomena; D002021:Buffers; D002473:Cell Wall / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003373:Coumaric Acids / Q000032:analysis; D004043:Dietary Fiber / Q000032:analysis*; D004951:Esterification; D005936:Glucans / Q000737:chemistry; D006358:Hot Temperature; D015394:Molecular Structure; D010368:Pectins / Q000737:chemistry; D011134:Polysaccharides / Q000737:chemistry*; D012210:Rhamnose / Q000737:chemistry; D011198:Solanum tuberosum / Q000737:chemistry*; D012995:Solubility; D013045:Species Specificity; D014574:Uronic Acids / Q000737:chemistry; D014867:Water / Q000737:chemistry*; D014990:Xylans / Q000737:chemistry
chemical_list: D000468:Alkalies; D002021:Buffers; D003373:Coumaric Acids; D004043:Dietary Fiber; D005936:Glucans; D011134:Polysaccharides; D014574:Uronic Acids; D014990:Xylans; D014867:Water; C029353:xyloglucan; D010368:Pectins; C004999:ferulic acid; D012210:Rhamnose