6533b832fe1ef96bd129a337
RESEARCH PRODUCT
Synthesis and evaluation of thermo-rheological behaviour and ionotropic crosslinking of new gellan gum-alkyl derivatives.
Fabio Salvatore PalumboStefano AgnelloGiovanna PitarresiCalogero FioricaGaetano GiammonaGaetano Giammonasubject
Materials Chemistry2506 Metals and AlloysPolymers and Plastics02 engineering and technologymacromolecular substances010402 general chemistry01 natural sciencesAlkylaminesGellan gumAlkylaminechemistry.chemical_compoundRheologyPolymer chemistryMaterials ChemistryDerivatizationAlkylchemistry.chemical_classificationPolymers and PlasticOrganic ChemistryHydrogels021001 nanoscience & nanotechnologyGellan gum0104 chemical sciencesHydrogelchemistrySettore CHIM/09 - Farmaceutico Tecnologico ApplicativoSelf-healing hydrogels0210 nano-technologyRheologyIonotropic effectdescription
Abstract This paper reports the synthesis and the physicochemical characterization of two series of gellan gum (GG) derivatives functionalized with alkyl chains with different number of carbon, from 8 to 18. In particular, low molecular weight gellan gum samples with 52.6 or 96.7 kDa, respectively, were functionalized with octylamine (C8), dodecylamine (C12) and octadecylamine (C18) by using bis(4-nitrophenyl) carbonate (4-NPBC) as a coupling agent. Thermo-rheological and ionotropic crosslinking properties of these gellan gum-alkyl derivatives were evaluated and related to the degree of derivatization in alkyl chains. Results suggested as length and degree of derivatization differently influenced coil-to-helix gelation mechanism of GG derivatives, ionotropic crosslinking, and strength of crosslinked hydrogels obtained in CaCl2 0.102 M and NaCl 0.15 M. Statement of hypothesis: The insertion of alkyl chains on the gellan gum backbone interferes with coil-to-helix transition mechanism and allows the production of hydrophobically assembled hydrogels.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-04-01 | Carbohydrate polymers |