Recovery of chitosan from aqueous acidic solutions by salting-out: Part 1. Use of inorganic salts
- 作者：Jean-Guy LeHoux ; Gilles Dupuis
- 关键词：Chitosan ; Salting-out ; Hofmeister’ ; s salts ; Chitosan hydrolysates
- 刊名：Carbohydrate Polymers
- 出版年：2007
- 期刊代码：14_01448617
- 类别：ch
- 出版时间：21 March 2007
- 卷：68
- 期：2
- 页码：295-304
- 文件大小：308 K
摘要
We describe a novel and easy-to-use approach based on salting-out to efficiently recover chitosan from aqueous acidic solutions. Inorganic salts of the Hofmeister series salted-out chitosans of 30 kiloDaltons (kDa), 240 kDa (35 cP) and a 70 cP form of the biopolymer dissolved in dilute HCl or acetic acid. The efficiency generally followed the ranking order of the Hofmeister’s salts . Temperature (4 °C, room temperature, 50 °C) did not markedly affect the process. Ammonium sulfate was the most efficient salting-out agent of chitosans over a wide range of molecular sizes (2300 Da to >240,000 Da). The solubility (dilute HCl or acetic acid) of the salted-out chitosans varied from readily soluble to nearly insoluble. The choice of the Hofmeister’s salt(s) for salting-out chitosans must take into account, (1) the efficiency of recovery, and (2) the molecular size of the chitosans to be recovered.