Modification of pectin with UV-absorbing substitutents and its effect on the structural and hydrodynamic properties of the water-soluble derivatives

Modification of pectin with UV-absorbing substitutents and its effect on the structural and hydrodynamic properties of the water-soluble derivatives

Citrus pectin with a low degree of methyl esterification (LMP) and its deesterified form, potassium pectate (KP), were modified with a low amount of UV-absorbing substituents. For this purpose, two different substitution reactions were used (a) alkylation of hydroxyl groups with p-carboxybenzyl brom...

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Veröffentlicht in:Carbohydrate polymers 2002-06, Vol.48 (4), p.351-359
Hauptverfasser: Morris, Gordon A., Hromádková, Zdenka, Ebringerová, Anna, Malovı́ková, Anna, Alföldi, Juraj, Harding, Stephen E.
Format: Artikel
Sprache:eng
Schlagworte:
Alkylation
Analytical ultracentrifuge
Applied sciences
Benzyl ester
Calcium pectate
Carboxybenzyl ether
Chemical modification
Derivatives
Esterification
Exact sciences and technology
Hydrodynamic properties
Hydrodynamics
Low methylesterified pectin
Natural polymers
NMR spectroscopy
Nuclear magnetic resonance spectroscopy
Physicochemistry of polymers
Starch and polysaccharides
Substitution reactions
Ultraviolet radiation
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Zusammenfassung:Citrus pectin with a low degree of methyl esterification (LMP) and its deesterified form, potassium pectate (KP), were modified with a low amount of UV-absorbing substituents. For this purpose, two different substitution reactions were used (a) alkylation of hydroxyl groups with p-carboxybenzyl bromide in aqueous alkali and (b) alkylation of the carboxylate group with benzyl bromide in the DMSO/TBAI/catalyst system. Chemical and spectroscopic methods reveal a low degree of substitution (DS
ISSN:0144-8617
1879-1344
DOI:10.1016/S0144-8617(01)00268-5