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The effects of gamma rays upon monohydrated and anhydrous asparagine: a DSC study in sealed pans

Journal of Radioanalytical and Nuclear Chemistry volume 295, pages 379–384 (2013)Cite this article

Abstract

Non-irradiated and gamma irradiated monohydrated (l Asn·H2O) and anhydrous (l Asn) asparagines, in solid state, were studied by means of DSC. The samples were irradiated at room temperature with gamma radiations using a 137Cs source. The exposure doses ranged between 1 and 10 kGy. All samples were scanned in sealed pans, from room temperature to a temperature beyond the melting point. The DSC scans of l Asn·H2O samples in sealed crucibles revealed the presence of two dehydration processes and one of decomposition and only decomposition in the case of l Asn. The influence of gamma irradiation consisted in decreasing the enthalpy of dehydration and of decomposition. A decomposition mechanism is proposed.

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Acknowledgments

Support of the EU (ERDF) and Romanian Government, that allowed for acquisition of the research infrastructure under POS-CCE O 2.2.1 project INFRANANOCHEM-No. 19/01.03.2009, is gratefully acknowledged.

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Authors and Affiliations

  1. Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blvd, 030018, Bucharest, Romania

    M. Contineanu

  2. Institute of Physical Chemistry, “I. Murgulescu”, 202 Spl. Independentei, 060021, Bucharest, Romania

    Ana Neacsu & Iulia Contineanu

  3. Faculty of Applied Chemistry and Material Science, University Politehnica Bucharest, 1 Polizu Str, 011061, Bucharest, Romania

    Stefan Perisanu

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  1. M. Contineanu
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  2. Ana Neacsu
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  3. Iulia Contineanu
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Correspondence to Ana Neacsu.

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Contineanu, M., Neacsu, A., Contineanu, I. et al. The effects of gamma rays upon monohydrated and anhydrous asparagine: a DSC study in sealed pans. J Radioanal Nucl Chem 295, 379–384 (2013). https://doi.org/10.1007/s10967-012-2157-4

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  • DOI: https://doi.org/10.1007/s10967-012-2157-4

Keywords

  • Gamma rays
  • DSC
  • Asparagine monohydrate
  • Anhydrous asparagine
  • Sealed crucible
  • Decomposition