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DSC evaluation of cross-link development induced by laccases in corneas

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Abstract

Several studies have been developed aiming at new treatments for ophthalmological problems such as keratoconus, an eye disease that leads to the reduction of cross-links between the corneal collagen fibrils. Corroborating these studies, this work evaluated the increase of cross-linking in enucleated porcine eyes treated with catechin in the presence of laccase. The ideal conditions for the treatment of the cornea to promote the development of cross-links were determined through the application of a design of experiments. The input variables were the concentration of laccase and the reaction temperature, and the output variable was the enthalpy of corneal denaturation. The DSC results show that the ideal laccase concentration was 8.0 mg mL−1 and the temperature was 36.0 °C. The catechin concentration used was 5.0 mg mL−1. This condition led to a 10.8% increase in the denaturation temperature and a 110.3% increase in the denaturation enthalpy. Enzymatic degradation tests showed that within 24 h of digestion the group treated with laccase in the presence of catechin was more resistant compared to the control group. A decrease of 34.7 and 55.6% in the relative area and relative mass of corneas in the control group was verified, while for the group treated with laccase these values were 41.7 and 8.5%, respectively.

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Acknowledgements

This work was supported by the grant #2015/19273-2 from São Paulo Research Foundation (FAPESP).

Funding

Fundação de Amparo à Pesquisa do Estado de São Paulo, 2015/19273-2, Andreia de Araújo Morandim-Giannetti.

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Authors and Affiliations

  1. Departamento de Engenharia Química, Centro Universitário FEI, São Bernardo Do Campo, Brazil

    Andreia de Araújo Morandim-Giannetti

  2. Departamento de Oftalmologia e Ciências Visuais, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil

    Taleesa Souza Carvalho

  3. Departamento de Bioquímica, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil

    José Carlos de Andrade Neto & Patrícia Alessandra Bersanetti

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  1. Andreia de Araújo Morandim-Giannetti
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  2. Taleesa Souza Carvalho
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  3. José Carlos de Andrade Neto
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  4. Patrícia Alessandra Bersanetti
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Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analyses were performed by AAM-G, TSC, JCAN, and PAB. The first draft of the manuscript was written by AAM-G and PAB, and all authors commented on previous versions of the manuscript. All authors have read and approved the final manuscript.

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Correspondence to Andreia de Araújo Morandim-Giannetti.

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Morandim-Giannetti, A.A., Carvalho, T.S., de Andrade Neto, J.C. et al. DSC evaluation of cross-link development induced by laccases in corneas. J Therm Anal Calorim 148, 63–68 (2023). https://doi.org/10.1007/s10973-022-11783-w

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