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Rheological characterization under shear of a fraction of polymer produced via fermentation of whey-related media by Rahnella aquatilis

1998Journal article Restricted access
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dc.contributor.authorPintado, M. E.
dc.contributor.authorSilva, J. A. Lopes da
dc.contributor.authorPintado, Ana I. E.
dc.contributor.authorMalcata, F. Xavier
dc.date.accessioned2011-10-11T10:52:06Z
dc.date.available2011-10-11T10:52:06Z
dc.date.issued1998
dc.description.abstractProduction of lactan, a polysaccharide composed of mannose, galactose and galacturonic acid (at the ratio of 5:3:2), starting from a semidefined medium containing lactose via fermentation with Rahnella aquatilis was described previously. In this communication, such polysaccharide was produced from five alternative fermentation media: (1) a synthetic (defined) medium, plain whey (under (2) aerobic and (3) anaerobic conditions), (4) whey permeate and (5) whey with 2% NaCl (w/v). The effect of the concentration of polysaccharide, pH and ionic strength at harvest on the rheological properties of the polysaccharide was studied using lactan-enriched fractions recovered from each medium and analysed in solution under steady shear flow. Lactan solutions showed a shear-thinning behaviour in all cases, and increases in viscosity were observed at increasing concentrations of polysaccharide, as expected. The polysaccharide fraction produced from whey with 2% (w/v) NaCl and plain whey under anaerobic conditions exhibited lower viscosity than that produced from the other media, an observation that is associated with the lower concentration of polysaccharide. Post-harvest addition of salts (KCl or CaCl2) and changes in pH (3–11) affected slightly the viscosity of the polysaccharide solutions. q1998por
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.citationPINTADO, M. E....[et al] - Rheological characterization under shear of a fraction of polymer produced via fermentation of whey-related media by Rahnella aquatilis. Carbohydrate Polymers. ISSN 0144–8617. Vol. 37 (1998), p. 1–6por
dc.identifier.doi10.1016/S0144-8617(98)00032-0
dc.identifier.urihttp://hdl.handle.net/10400.14/5929
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectLactanpor
dc.subjectRahnella aquatilispor
dc.subjectPolysaccharidepor
dc.titleRheological characterization under shear of a fraction of polymer produced via fermentation of whey-related media by Rahnella aquatilispor
dc.typejournal article
dspace.entity.typePublication
person.familyNamePintado
person.familyNameSilva
person.familyNamePintado
person.familyNameMalcata
person.givenNameMaria Manuela
person.givenNameJoana
person.givenNameAna
person.givenNameFrancisco
person.identifier456608
person.identifier.ciencia-id2F13-AAE0-3405
person.identifier.ciencia-idB415-743D-D9F9
person.identifier.ciencia-id871B-4017-FC07
person.identifier.ciencia-id1B13-38A5-35F5
person.identifier.orcid0000-0002-0760-3184
person.identifier.orcid0000-0003-3977-7418
person.identifier.orcid0000-0002-4931-708X
person.identifier.orcid0000-0003-3073-1659
person.identifier.ridF-5696-2013
person.identifier.scopus-author-id7004483898
person.identifier.scopus-author-id7403023130
person.identifier.scopus-author-id6602847645
person.identifier.scopus-author-id7102542478
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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