Preparation of the Amidated Alginate and Comparison of the Hypocholesterolemic and Hypolipidemic Activity with Alginate in Rats

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027014%3A_____%2F17%3AN0000195" target="_blank" >RIV/00027014:_____/17:N0000195 - isvavai.cz</a>

Result on the web

<a href="https://vuzv.cz/_privat/17193.pdf" target="_blank" >https://vuzv.cz/_privat/17193.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Preparation of the Amidated Alginate and Comparison of the Hypocholesterolemic and Hypolipidemic Activity with Alginate in Rats

Original language description

Alginate is a copolymer of beta-D-mannuronate and alfa-L-guluronate, which are present in the cell wall of brown algae. Alginic acid is a suitable material for modification of new derivatives because of presence of its carboxyl groups. The high content of carboxyl groups over the entire length of its chain renders an easily modifiable material with a possibility of achieving a high degree of substitution in the prepared derivatives. The amidation used two-steps; methyl esterification followed by amino-de-alkoxylation. The aim of this study was to prepare highly substituted derivative with long (C-18) polysaccharide chain. The hypocholesterolemic and hypolipidemic activities of alginate and its hydrophobic derivative, which is prepared by a reaction with octadecylamine, were compared in rats fed diets containing cholesterol and palm fat at 10 and 50 g/kg, respectively. Amidated alginate at 20 g/kg significantly decreased serum cholesterol from 2.93 to 2.00 mikromol/ml, serum triacylglycerols from 1.66 to 0.92 mikromol/ml, hepatic cholesterol from 17.5 to 5.9 mikromol/g, and total hepatic lipids from 67.4 to 51.7 mg/g. Alginate at 20 g/kg significantly reduced hepatic cholesterol to 13.1 fimol/g, but did not influence serum cholesterol, triacylglycerols, and total hepatic lipids. Amidated alginate significantly increased the faecal concentrations of neutral sterols from 98.7 to 122.4 mikromol/g DM, but decreased faecal concentration of bile acids from 19.4 to 14.0 mikromol/g DM. In samples of intestinal contents, taurine-conjugated bile acids dominated glycine conjugates. The supplementation of diets with cholesterol significantly increased the expression of hepatic cholesterol 7a-hydroxylase, especially in rats that received cholesterol without alginate or amidated alginate. Amidated alginate non-significantly increased faecal concentration of fat by 24.5%.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10608 - Biochemistry and molecular biology

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Propceedings of the 13th International Conference on Polysacharides-Glycoscience

ISBN

978-80-86238-74-6

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

293-298

Publisher name

Czech Chemical Society

Place of publication

Prague

Event location

Prague

Event date

Nov 8, 2017

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

000424398900070