Extraction and characterization of a natural rubber from Euphorbia characias latex

Authors

  • Delia Spanò,

    1. Department of Sciences of Life and Environment, University of Cagliari, Cittadella Universitaria, I–09042 Monserrato (CA), Italy
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  • Francesca Pintus,

    1. Department of Sciences of Life and Environment, University of Cagliari, Cittadella Universitaria, I–09042 Monserrato (CA), Italy
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  • Claudia Mascia,

    1. Department of Sciences of Life and Environment, University of Cagliari, Cittadella Universitaria, I–09042 Monserrato (CA), Italy
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  • Mariano Andrea Scorciapino,

    1. Department of Chemical Sciences, University of Cagliari, Cittadella Universitaria, I–09042 Monserrato (CA), Italy
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  • Mariano Casu,

    1. Department of Chemical Sciences, University of Cagliari, Cittadella Universitaria, I–09042 Monserrato (CA), Italy
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  • Giovanni Floris,

    1. Department of Sciences of Life and Environment, University of Cagliari, Cittadella Universitaria, I–09042 Monserrato (CA), Italy
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  • Rosaria Medda

    Corresponding author
    1. Department of Sciences of Life and Environment, University of Cagliari, Cittadella Universitaria, I–09042 Monserrato (CA), Italy
    • Department of Sciences of Life and Environment, University of Cagliari, Cittadella Universitaria, I–09042 Monserrato (CA), Italy
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  • This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com

Abstract

A natural rubber was identified and characterized for the first time in the latex of the perennial Mediterranean shrub Euphorbia characias. Four different methods, i.e., acetone, acetic acid, trichloroacetic acid, and Triton® X-100, followed by successive treatments with cyclohexane/ethanol, were employed to extract the natural rubber. The rubber content was shown to be 14% (w/v) of the E. characias latex, a low content compared with that of Hevea brasiliensis (30–35%) but a similar content to other rubber producing plants. E. characias rubber showed a molecular weight of 93,000 with a Mw/Mn of 2.9. 1H NMR, 13C NMR, and FTIR analysis revealed the characteristic of the cis-1,4-polyisoprene typical of natural rubber. These results provided novel insight into latex components and will ultimately benefit the broader understanding of E. characias latex composition. © 2012 Wiley Periodicals, Inc. Biopolymers 97: 589–594, 2012.

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