4.7 Article

Microwave assisted synthesis of pH-responsive swellable adducts of chitosan-polyuronic acids

Journal

CARBOHYDRATE POLYMERS
Volume 83, Issue 3, Pages 1402-1407

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2010.10.023

Keywords

Chitosan; Polyuronic acids; Microwave synthesis; Swellable adducts

Funding

  1. Department of Science & Technology, New Delhi [SR/FT/CS-001/2008]
  2. Ministry of Earth Sciences, Government of India, New Delhi [MoES/9-DS/6/2007-PC-IV]

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A facile method for synthesizing super-swellable, pH-responsive and insoluble adducts (e.g. CH-PMA and CH-PGA) of acid-soluble chitosan (CH) with alkali-soluble poly-mannuronic (PMA) and poly-guluronic (PGA) acids using microwave (MW) heating is described. The reactions were also carried out using conventional oil bath heating method. Microwave heating to 100 degrees C for 5 min produced greatest yields (95-97%) and swelling ratios (2700-3000%) with these two acids. The conventional heating method, however, required 60 min to produce greatest yields (74-80%) and swelling ratios (1450-1900%), which plateaued even on heating up to 120 min. Adducts were characterized by FT-IR and CP-MAS C-13 NMR techniques. (C) 2010 Elsevier Ltd. All rights reserved.

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