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Promising alternative gum: Extraction, characterization, and oxidation of the galactomannan of Cassia fistula.

Abstract：

:Galactomannan extracted from Cassia fistula seed endosperm present little data related to the its structural characterization. This study reports the chemical characterization of the galactomannan from Cassia fistula (CF) and their oxidized derivatives. The extracted CF presented a yield of 26.5% (w/w) and the intrinsic viscosity [η] was 9.73 dL/g. 1D and 2D nuclear magnetic resonance spectroscopy (NMR) confirmed that the polysaccharide has a backbone of 4-linked β-D-mannose units, and contains galactose units as pending groups. These galactose units are linked to the central core through a (1→6) linkage and the galactomannan presented Man/Gal ratio of 3.1/1. The galactomannan from Cassia fistula presents low cytotoxicity in Vero cells with a CC50 > 1000 μg/ml. The properties of CF resemble other commercially important galactomannans such as Locust bean gum. Three oxidized derivatives of CF were produced by periodate oxidation, which were carefully characterized by different structural techniques. It was observed that as the degree of oxidation increased, there was an increase in the Man/Gal ratio and a reduction in molar mass and viscosity. The polialdehyde produced may be explored as a versality material to react with amine group of the protein and amined polysaccharide to produce biomaterials.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

da Silva LM,Araújo LFS,Alvez RC,Ono L,Sá DAT,da Cunha PLR,Monteiro de Paula RC,Maciel JS

doi

10.1016/j.ijbiomac.2020.09.164

subject

Has Abstract

pub_date

2020-12-15 00:00:00

pages

436-444

issue

Pt A

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(20)34523-2

journal_volume

165

pub_type

杂志文章

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