Preparation and physico-chemical properties of hydrogels from carboxymethyl cassava starch crosslinked with citric acid

Sasikan Boonkham; Kunruedee Sangseethong; Pathama Chatakanon; Chalida Niamnuy; Kiyohiko Nakasaki; Klanarong Sriroth

doi:10.1117/12.2054229

2 June 2014 Preparation and physico-chemical properties of hydrogels from carboxymethyl cassava starch crosslinked with citric acid

Sasikan Boonkham, Kunruedee Sangseethong, Pathama Chatakanon, Chalida Niamnuy, Kiyohiko Nakasaki, Klanarong Sriroth

Author Affiliations +

Proceedings Volume 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics; 923403 (2014) https://doi.org/10.1117/12.2054229
Event: International Conference on Experimental Mechanics 2013 and the Twelfth Asian Conference on Experimental Mechanics, 2013, Bangkok, Thailand

Abstract

Recently, environmentally friendly hydrogels prepared from renewable bio-based resources have drawn significant attention from both industrial and academic sectors. In this study, chemically crosslinked hydrogels have been developed from cassava starch which is a bio-based polymer using a non-toxic citric acid as a crosslinking agent. Cassava starch was first modified by carboxymethylation to improve its water absorbency property. The carboxymethyl cassava starch (CMCS) obtained was then crosslinked with citric acid at different concentrations and reaction times. The gel fraction of hydrogels increased progressively with increasing citric acid concentration. Free swelling capacity of hydrogels in de-ionized water, saline solution and buffers at various pHs as well as absorption under load were investigated. The results revealed that swelling behavior and mechanical characteristic of hydrogels depended on the citric acid concentration used in reaction. Increasing citric acid concentration resulted in hydrogels with stronger network but lower swelling and absorption capacity. The cassava starch hydrogels developed were sensitive to ionic strength and pH of surrounding medium, showing much reduced swelling capacity in saline salt solution and acidic buffers.

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Sasikan Boonkham, Kunruedee Sangseethong, Pathama Chatakanon, Chalida Niamnuy, Kiyohiko Nakasaki, and Klanarong Sriroth "Preparation and physico-chemical properties of hydrogels from carboxymethyl cassava starch crosslinked with citric acid", Proc. SPIE 9234, International Conference on Experimental Mechanics 2013 and Twelfth Asian Conference on Experimental Mechanics, 923403 (2 June 2014); https://doi.org/10.1117/12.2054229

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