Microwave assisted rapid method for hydrolysis of sodium alginate for M/G ratio determination |
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Authors: | Mahesh Chhatbar Ramavatar Meena Kamalesh Prasad A.K. Siddhanta |
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Affiliation: | aMarine Biotechnology and Ecology Discipline, Central Salt and Marine Chemicals Research Institute (Council of Scientific and Industrial Research), G. B. Marg, Bhavnagar 364002, Gujarat, India |
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Abstract: | A rapid one-pot method for hydrolysis of sodium alginate for determining M/G ratio has been developed under mild conditions, using microwave irradiation. Poly-mannuronic acid (PMA) and poly-guluronic acid (PGA) ratio was determined (M/G 0.38), which was similar to that (M/G 0.39) obtained by the conventional method, using sodium alginate of Sigma as reference sample for bench marking. For validation of the method PMA and PGA were characterized by density, porosity, viscosity, optical rotation measurements, 13C NMR, FT-IR, thermogravimetric analysis (TGA), X-ray diffraction, circular dichroism (CD), molar mass distribution (GPC) and scanning electron microscopy (SEM). |
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Keywords: | Sodium alginate M/G ratio Microwave irradiation SEM 13C NMR CD |
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