Abstract
In this study, carboxymethyl chitosan hydrogels (CMCH) cross-linked with catechin in the presence of laccase (CMCH-C-L) were obtained. The synthesis and characterization of CMCH were carried out from chitosan (CH) and its cross-linking with catechin (C) in the presence of laccase (L). DSC, ATR-FTIR, and rheological analyses of the CMCH solution and CMCH-C-L hydrogel were carried out. Three main thermal events were observed in the DSC characterization with temperatures and enthalpies related to each event for CMCH: 167.2 °C/+ 523.3 J g−1, 269.1 °C/− 35.0 J g−1, and 333.3 °C/− 17.6 J g−1, possibly referring to these processes: polymerization, breaking of electrostatic interactions, and decomposition of the material, respectively. The CMCH-C-L hydrogel presented values of 165.2 °C/+ 376.6 J g−1, 266.7 °C/− 47.8 J g−1, and 333.3 °C/− 31.5 J g−1. Conversely, the chitosan presented only one thermal event of decomposition at 302.5 °C and enthalpy of − 258.5 J g−1. Rheological properties of the hydrogels (viscosities, consistency values, and flow indices) showed non-Newtonian pseudoplastic rheological behavior and that the viscosity increased approximately 150% after the reaction (134.25 mPa s for CMCH and 342.85 mPa s in CMCH-C-L) confirming the formation of cross-links after the addition of catechin and laccase. Morphological analyses of CMCH and CMCH-C-L films via SEM showed the modification of the material after the reaction with the catechin in the presence of laccase and corroborated with the results, confirming the presence of cross-links.
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Acknowledgements
This work was supported by the Grant # 2015/19273-2 from the São Paulo Research Foundation (FAPESP). We thank Dr. Nivaldo Boralle and Silvia Helena Santagneli for the NMR measurements and LMA-IQ UNESP-Araraquara-SP, Brazil, for making the high-resolution electronic scanning microscope available.
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Morandim-Giannetti, A.d., Wecchi, P.d., Silvério, P.d. et al. Attainment and characterization of carboxymethyl chitosan hydrogels by enzymatic cross-linking. J Therm Anal Calorim 138, 3635–3643 (2019). https://doi.org/10.1007/s10973-019-08571-4
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DOI: https://doi.org/10.1007/s10973-019-08571-4