Modification and physico-chemical properties of citrus pectin – Influence of enzymatic and acidic demethoxylation

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dc.contributor.authorEinhorn-Stoll, Ulrike
dc.contributor.authorKastner, Hanna
dc.contributor.authorHecht, Theresia
dc.contributor.authorZimathies, Annett
dc.contributor.authorDrusch, Stephan
dc.date.accessioned2020-03-27T06:45:14Z
dc.date.available2020-03-27T06:45:14Z
dc.date.issued2015-06-04
dc.description.abstractAim of the present study was to investigate the effect of the method of demethoxylation on the particle structure and techno-functional properties of pectins with different degree of methoxylation and distribution of free carboxyl groups. Two groups of model pectins, one with 57% and one with 42% degree of methoxylation have been prepared from one single commercial pectin. Modifications were performed by an acidic and two enzymatic methods using fungal and plant-derived pectin methyl esterases. Thermal stability was investigated by thermal analysis and water uptake was determined by a sorption and a capillary sucking method. The enzyme-treated pectins were thermally less stable than the acid-treated. The water uptake of enzyme-treated pectins was higher than in acid-treated samples in the sorption method and lower in the capillary sucking tests. The different behaviour is explained by differences in pH during demethoxylation and a co-occurring variation in sodium content. Both parameters affected intermolecular interactions of the pectin macromolecules in solution, which resulted in differences in the particle morphology. The effect of the distribution of free carboxyl groups (statistical or block-wise) on the techno-functional properties was more pronounced in high-methoxylated pectins than in low-methoxylated pectins.en
dc.identifier.eissn1873-7137
dc.identifier.issn0268-005X
dc.identifier.urihttps://depositonce.tu-berlin.de/handle/11303/10959
dc.identifier.urihttp://dx.doi.org/10.14279/depositonce-9849
dc.language.isoenen
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subject.ddc664 Lebensmitteltechnologiede
dc.subject.otherpectinen
dc.subject.otherdemethoxylationen
dc.subject.otherpH-influenceen
dc.subject.otherthermal stabilityen
dc.subject.otherwater sorptionen
dc.titleModification and physico-chemical properties of citrus pectin – Influence of enzymatic and acidic demethoxylationen
dc.typeArticleen
dc.type.versionacceptedVersionen
dcterms.bibliographicCitation.doi10.1016/j.foodhyd.2015.05.031en
dcterms.bibliographicCitation.journaltitleFood Hydrocolloidsen
dcterms.bibliographicCitation.originalpublishernameElsevieren
dcterms.bibliographicCitation.originalpublisherplaceAmsterdam [u.a.]en
dcterms.bibliographicCitation.pageend345en
dcterms.bibliographicCitation.pagestart338en
dcterms.bibliographicCitation.volume51en
tub.accessrights.dnbfreeen
tub.affiliationFak. 3 Prozesswissenschaften::Inst. Lebensmitteltechnologie und Lebensmittelchemie::FG Lebensmitteltechnologie und -materialwissenschaftende
tub.affiliation.facultyFak. 3 Prozesswissenschaftende
tub.affiliation.groupFG Lebensmitteltechnologie und -materialwissenschaftende
tub.affiliation.instituteInst. Lebensmitteltechnologie und Lebensmittelchemiede
tub.publisher.universityorinstitutionTechnische Universität Berlinen

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