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Polymers 2010, 2(4), 505-521; doi:10.3390/polym2040505
Article

Periodate Oxidation of Methylcellulose: Characterization and Properties of Oxidized Derivatives

Received: 23 August 2010 / Revised: 19 October 2010 / Accepted: 28 October 2010 / Published: 29 October 2010
(This article belongs to the Special Issue Natural Polymers)
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Abstract

In this paper, the behavior of oxidized methylcelluloses is compared with that of the initial methylcellulose, an amphiphilic cellulose derivative. Methylcelluloses are important for many applications in the cosmetic and food industries. The mechanism of thermo-gelation of methylcellulose is briefly explained as well as the method of oxidation of polysaccharides. Then, our experiments involve the preparation of oxidized methylcelluloses: three degrees of oxidation are prepared and the new polymers are characterized by NMR, IR, SEC and rheology. Oxidation with periodate theoretically allows introduction of two aldehydic groups on C2–C3 glycol positions of anhydroglucose units. This reaction not only enhances the flexibility of the cellulosic backbone, but also causes a decrease in the molecular weight. In particular, the rheological behavior of methylcellulose and oxidized methylcellulose as a function of temperature is examined. The oxidized methylcelluloses prepared, being rich in aldehyde functions, become interesting intermediaries to prepare new cellulose derivatives. In this paper, three examples of reductive amination based on the reaction of modified methylcelluloses and −NH2 groups of different molecules are described: β-alanine produces a polyelectrolyte; chitosan and hyaluronan-ADH (derivative obtained with adipic dihydrazide allowing introduction of −NH2 functions on HA backbone) are crosslinked and give new biocompatible hydrogels.
Keywords: oxidized methylcellulose; reductive amination; crosslinkage of chitosan; crosslinkage of hyaluronan oxidized methylcellulose; reductive amination; crosslinkage of chitosan; crosslinkage of hyaluronan
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Rinaudo, M. Periodate Oxidation of Methylcellulose: Characterization and Properties of Oxidized Derivatives. Polymers 2010, 2, 505-521.

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