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Title: Enrichment desired quality chitosan fraction and advance yield by sequential static and static-dynamic supercritical CO2
Authors: Yi-Yin Hsieh
Hui Yen Chin
Min-Lang Tsai
Contributors: 國立臺灣海洋大學:食品科學系
Keywords: Polydispersity index
Static–dynamic supercritical carbon dioxide
Degree of deacetylation
Molecular weight
Date: 2015-11
Issue Date: 2016-12-14T02:37:25Z
Publisher: Carbohydrate Polymers
Abstract: Abstract: This study aimed to establish the sequential static and static–dynamic supercritical carbon dioxide (SDCO2) fractionation conditions to obtain a higher yield and desired chitosan with lower polydispersity index (PDI) and higher degree of deacetylation (DD). The yield increased with increasing DD of used chitosan and amount of cosolvent. The yield of acetic acid cosolvent was higher than those of malic and citric acid cosolvents. SDCO2, compared to static supercritical carbon dioxide, has higher yield. The yield of extracted chitosan was 5.82–14.70% by SDCO2/acetic acid, which increases with increasing pressure. The DD of fractionated chitosan increased from 66.1% to 70.81–85.33%, while the PDI decreased from 3.97 to 1.69–3.16. The molecular weight changed from 622 kDa to 412–649 kDa, which increased as density of supercritical carbon dioxide increases. Hence, higher DD and lower PDI extracted chitosan can be obtained through controlling the temperature and pressure of SDCO2.
Relation: 133
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39469
Appears in Collections:[食品科學系] 期刊論文

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