Long, Xiaoshan, Hu, Xiao, Zhou, Shaobo ORCID: https://orcid.org/0000-0001-5214-2973, Huan, Xiang, Shengjun, Chen, Laihao, Li, Shucheng, Liu and Xianqing, Yang (2021) Optimized degradation and inhibition of α-glucosidase activity by Gracilaria lemaneiformis polysaccharide and its production in vitro. Marine Drugs, 20 (1):13. pp. 1-22. ISSN 1660-3397 (Online) (doi:10.3390/md20010013)

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Abstract

Gracilaria lemaneiformis polysaccharide (GLP) exhibits good physiological activities, and it is more beneficial as it is degraded. After its degradation by hydrogen peroxide combined with vitamin C (H2O2-Vc) and optimized by Box–Behnken Design (BBD), a new product of GLP-HV will be generated. While using GLP as control, two products of GLP-H (H2O2-treated) and GLP-V (Vc-treated) were also produced. These products chemical characteristics (total sugar content, molecular weight, monosaccharide composition, UV spectrum, morphological structure, and hypolipidemic activity in vitro) were assessed. The results showed that the optimal conditions for H2O2-Vc degradation were as follows: H2O2-Vc concentration was 18.7 mM, reaction time was 0.5 h, and reaction temperature was 56 °C. The total sugar content of GLP and its degradation products (GLP-HV, GLP-H and GLP-V) were more than 97%, and their monosaccharides are mainly glucose and galactose. The SEM analysis demonstrated that H2O2-Vc made the structure loose and broken. Moreover, GLP, GLP-HV, GLP-H, and GLP-V had significantly inhibition effect on α-glucosidase, and their IC50 value were 3.957, 0.265, 1.651, and 1.923 mg/mL, respectively. GLP-HV had the best inhibition effect on α-glucosidase in a dose-dependent manner, which was the mixed type of competitive and non-competitive. It had a certain quenching effect on fluorescence of α-glucosidase, which may be dynamic quenching.

Item Type:	Article
Additional Information:	This article belongs to the Special Issue Enzyme Inhibitors from Marine Resources.
Uncontrolled Keywords:	Gracilaria lemaneiformis; polysaccharide; degradation optimization; chemical characteristics; hypolipidemic activity; α-glucosidase
Subjects:	Q Science > Q Science (General) R Medicine > RA Public aspects of medicine > RA0421 Public health. Hygiene. Preventive Medicine R Medicine > RM Therapeutics. Pharmacology
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Science (SCI)
Last Modified:	24 Mar 2023 08:14
URI:	http://gala.gre.ac.uk/id/eprint/39035

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