TY - JOUR
T1 - Simultaneous deacetylation and degradation of chitin hydrogel by electrical discharge plasma using low sodium hydroxide concentrations
AU - Rujiravanit, Ratana
AU - Kantakanun, Maneekarn
AU - Chokradjaroen, Chayanaphat
AU - Vanichvattanadecha, Chutima
AU - Saito, Nagahiro
N1 - Funding Information:
CC wishes to thank the Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University for providing a postdoctoral fellowship grant. This research was financially supported by the Thailand Research Fund (TRF) under contract number BRG5480008 and from JST/CREST under the grant number GJPMJCR12L1 . The authors really appreciate Surapon Foods Public Co., Ltd. (Thailand) for providing the shrimp shells and the NU-PPC Plasma Chemical Technology Laboratory at Chulalongkorn University (Thailand) for providing the solution plasma equipment and chemicals.
Funding Information:
CC wishes to thank the Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University for providing a postdoctoral fellowship grant. This research was financially supported by the Thailand Research Fund (TRF) under contract number BRG5480008 and from JST/CREST under the grant number GJPMJCR12L1. The authors really appreciate Surapon Foods Public Co. Ltd. (Thailand) for providing the shrimp shells and the NU-PPC Plasma Chemical Technology Laboratory at Chulalongkorn University (Thailand) for providing the solution plasma equipment and chemicals.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/1/15
Y1 - 2020/1/15
N2 - Electrical discharge plasma occurring in a liquid phase, so called solution plasma, can generate highly active species, e.g. free radicals, which can involve in various chemical reactions, leading to less chemical uses. In this study, solution plasma was applied to deacetylation of chitin aiming to reduce the use of alkali. It was found that solution plasma could induce deacetylation of chitin hydrogels that were dispersed in MeOH/water solutions containing low NaOH concentrations (1–12%). Due to the action of free radicals, some extent of chain session of the polymer occurred during the plasma treatment. The degree of deacetylation and molecular weight of the obtained chitosan were 78% and 220 kDa, respectively, after the plasma treatment for five cycles (1 h/cycle) by using 90% MeOH/water solution containing 12% NaOH. The obtained chitosan could completely dissolve in 2% acetic acid solution and had antibacterial activities against S. aureus and E. coli.
AB - Electrical discharge plasma occurring in a liquid phase, so called solution plasma, can generate highly active species, e.g. free radicals, which can involve in various chemical reactions, leading to less chemical uses. In this study, solution plasma was applied to deacetylation of chitin aiming to reduce the use of alkali. It was found that solution plasma could induce deacetylation of chitin hydrogels that were dispersed in MeOH/water solutions containing low NaOH concentrations (1–12%). Due to the action of free radicals, some extent of chain session of the polymer occurred during the plasma treatment. The degree of deacetylation and molecular weight of the obtained chitosan were 78% and 220 kDa, respectively, after the plasma treatment for five cycles (1 h/cycle) by using 90% MeOH/water solution containing 12% NaOH. The obtained chitosan could completely dissolve in 2% acetic acid solution and had antibacterial activities against S. aureus and E. coli.
KW - Chitin hydrogel
KW - Chitosan
KW - Deacetylation
KW - Electrical discharge plasma
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U2 - 10.1016/j.carbpol.2019.115377
DO - 10.1016/j.carbpol.2019.115377
M3 - Article
C2 - 31635748
AN - SCOPUS:85072870830
SN - 0144-8617
VL - 228
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
M1 - 115377
ER -