978 resultados para C-13 Nmr Calculations
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1790/12/13 (N309).
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1790/06/13 (N132).
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1790/10/13 (N249).
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1789/09/13 (N2).
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1790/07/13 (N161).
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1791/05/13 (N457).
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1791/01/13 (N339).
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1791/03/13 (N398).
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1791/04/13 (N428).
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We present here the synthesis of a highly O-carboxymethylated chitosan derivative. First, an improved protocol for the two-step synthesis of N-trimethyl chitosan (TMC) from chitosan was developed, yielding a maximum degree of quaternization (DQ) of up to 46.6%. Successively, the chitosan derivative O-carboxymethyl-N-trimethyl chitosan (CMTMC) was synthesized from the TMC obtained by applying an optimized synthesis pathway. In contrast to previous reports, the optimized protocol was shown to yield very high rates (>85%) of O-carboxymethylation of CMTMC, as shown by (1)H NMR and heteronuclear single quantum correlation ((1)H-(13)C HSQC). Finally, in vitro cytocompatibility (viability >80%) of the polymer was demonstrated using human fibroblasts.
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1789/11/13 (N37).
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1790/01/13 (N96).
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1791/11/13 (N598).
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1790/08/13 (N190).