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Gamma radiation effects on molecular characteristic of vegetable tannins

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Abstract

The influence of gamma radiation on tannins extracted from Pinus caribaea bark and on tannin acid has been investigated in this study with the aim of searching for evidences of structural and/or conformational changes. To fulfill this purpose, the samples of tannins, such as tannic acid and P. caribaea tannin bark, were irradiated at different doses (from 5 to 35 kGy) using a cobalt-60 gamma irradiator. The changes were analyzed by a Fourier transform infrared spectrometry and by high resolution liquid chromatography. The results pointed out some structural and conformational changes under the effects of gamma radiation for doses higher than 5 kGy for P. caribaea tannin bark. However, no changes were detected on the irradiated tannic acid. The observed behavior suggests the loss of carbonyl groups. This could be associated to a decarboxylation process with the corresponding release of CO2 from the molecule. Evidences of some conformational changes were also noted.

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Acknowledgments

This work was supported by UESC (Universidade Estadual de Santa Cruz, Ilhéus/Bahia/Brazil) and the InSTEC (Instituto Superior de Tecnologias e Ciencias Aplicadas, Havana/Cuba) under the agreement Nº01/2,009 for Scientific Research Colaboration. The authors would also like to recognize the support of the CEADEN (Centro de Aplicaciones Tecnologicas y Desarrollo Nuclear, Havana/Cuba), institution in which the irradiation was performed. FG thanks the ICTP/UNESCO Italy (International Centre for Theoretical Physics) for partial financial support under Visiting Scholars/Consultant Program.

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Authors and Affiliations

  1. Universidade Estadual de Santa Cruz (UESC)/CPqCTR, Rodovia Jorge Amado Km 16, Ilhéus, BA, 45662-900, Brazil

    F. Garcia Velasco & F. H. M. Luzardo

  2. Centro de Estudios Avanzados de Cuba (CEAC), La Lisa, 17100, Havana, Cuba

    F. Guzman, I. Coto Hernandez & S. Barroso

  3. Instituto Superior de Tecnologías y Ciencias Aplicadas (InSTEC), Quinta de los Molinos, Ave. Salvador Allende y Luaces, Plaza de la Revolución, Havana, Cuba

    O. Rodriguez & O. Diaz Rizo

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  1. F. Garcia Velasco
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  2. F. H. M. Luzardo
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  3. F. Guzman
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  4. O. Rodriguez
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  5. I. Coto Hernandez
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  6. S. Barroso
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  7. O. Diaz Rizo
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Correspondence to F. Garcia Velasco.

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Velasco, F.G., Luzardo, F.H.M., Guzman, F. et al. Gamma radiation effects on molecular characteristic of vegetable tannins. J Radioanal Nucl Chem 299, 1787–1792 (2014). https://doi.org/10.1007/s10967-014-2921-8

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  • DOI: https://doi.org/10.1007/s10967-014-2921-8

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