Characterisation of macrogel composition from industrial natural rubber samples: Influence of proteins on the macrogel crosslink density

Rolere Sébastien, Bottier Céline, Vaysse Laurent, Sainte-Beuve Jérôme, Bonfils Frédéric. 2016. Characterisation of macrogel composition from industrial natural rubber samples: Influence of proteins on the macrogel crosslink density. Express Polymer Letters, 10 (5) : 408-419.

https://doi.org/10.3144/expresspolymlett.2016.38

Article de revue ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total

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Quartile : Q1, Sujet : POLYMER SCIENCE

Résumé : The insoluble (macrogel) and soluble fractions of 11 commercial natural rubber (NR) samples (Technically specified rubber) were separated. Nitrogen titrations and lipid extractions enabled a quantitative assessment of the proteins and extractable lipids in each fraction. Swelling was measured in tetrahydrofuran in order to evaluate the crosslink density (Mc –1) of each macrogel. While the soluble fraction had a high lipid concentration, the majority of non-isoprene compounds of the macrogel were found to be proteins, which accounted for 4.6 to 50.8% (w/w) of the macrogel. Indeed, the macrogels contained less than 0.5% (w/w) extractable lipids. However, our results showed that the soluble fraction contained large quantities of proteins (16–66% of the nitrogen content of the raw NR sample), probably structuring microaggregates. An exponential correlation (R2 > 0.96) was found between the crosslink density and the protein concentration of macrogel, suggesting that proteins are involved in the majority of crosslinks in macrogel.

Mots-clés Agrovoc : caoutchouc, Hevea brasiliensis

Classification Agris : Q60 - Traitement des produits agricoles non alimentaires

Champ stratégique Cirad : Axe 2 (2014-2018) - Valorisation de la biomasse

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