Mechanistic insights into controlled depolymerization of Chitosan using H-Mordenite.
Chitosan
Depolymerization
H-Mordenite
Reaction kinetics
Solid acid
Journal
Carbohydrate polymers
ISSN: 1879-1344
Titre abrégé: Carbohydr Polym
Pays: England
ID NLM: 8307156
Informations de publication
Date de publication:
15 Feb 2020
15 Feb 2020
Historique:
received:
05
08
2019
revised:
25
10
2019
accepted:
09
11
2019
entrez:
1
1
2020
pubmed:
1
1
2020
medline:
5
6
2020
Statut:
ppublish
Résumé
Kinetics of chitosan depolymerization were studied in dilute acetic acid solution, in presence of H-Mordenite (H-MOR). Rate constants for chitosan depolymerization were determined by measurement of molecular weight, using Gel permeation Chromatography (GPC). Depolymerization rate of chitosan was altered in presence of an acidic, porous material like H-MOR. Maximum concentration of H-MOR studied during process led to minimal increase in energy of activation, from 20.54 kJ/moL to 23.25 kJ/moL. Infra-red spectroscopy, adsorption studies and rheological assessment indicated adsorption /grafting of chitosan onto porous H-MOR surface as the possible mechanism for facilitation of the depolymerization process. Under extreme conditions investigated during process optimization, H-MOR resulted in a three-fold reduction in 5-Hydroxy Methyl Furfural (5-HMF) formation and over ten times decrease in glucosamine content, as compared to reactions conducted without H-MOR. Therefore, presence of H-MOR is imperative to cleave chitosan in controlled manner and obtain products of desired molecular weight, with fewer impurities.
Identifiants
pubmed: 31887872
pii: S0144-8617(19)31268-8
doi: 10.1016/j.carbpol.2019.115600
pii:
doi:
Substances chimiques
Acids
0
Aluminum Silicates
0
mordenite
12445-20-4
Chitosan
9012-76-4
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
115600Informations de copyright
Copyright © 2019 Elsevier Ltd. All rights reserved.