Valorisation of agricultural by-products, especially oil rich guayule extract

Palu Serge, Pioch Daniel, Tardan Eric, Punvichai Teerasak, Amor Ali. 2020. Valorisation of agricultural by-products, especially oil rich guayule extract. Journal of the American Oil Chemists' Society, 97 (S1), suppl. Virtual 2020 AOCS Annual Meeting & Expo June 29 – July 3, 2020, Résumé : 69. Virtual 2020 AOCS Annual Meeting & Expo, Autre, 29 Juin 2020/3 Juillet 2020.

Quartile : Q3, Sujet : CHEMISTRY, APPLIED / Quartile : Q3, Sujet : FOOD SCIENCE & TECHNOLOGY

Note générale : Le congrès s'est tenu en ligne

Résumé : P. argentatum (guayule) is a dry climate bush producing polyisoprene (PI) having properties close to hevea's, and resin, a complex mixture of terpenics and lipids. The present work deals with (i) characterizing the biomass and (ii) extracting resin under low environmental impact conditions. This complements on the resin side previous works of the team on PI extraction with water (latex), under the framework of EU funded Eu-Pearls project and Prince of Songkla University. Chemical analysis (GC, TLC, HPLC, IR, NMR) which needed setting-up new extraction protocols, coupled to imaging techniques, shows the important variability among the 26 biomass samples of same genotype (age, place): resin content in biomass parts and composition. The ratio of unsaponifiable / saponifiable fractions is always found larger than 1; taking into account that this last fraction contains 65% of cinnamic and para-anisic acids issued from the saponification of guayulins (sesquiterpenes esters), fatty acid-containing lipids are thus minor components in resin. Argentatins (tetracyclic triterpenes ceto-alcohols, up to 83% of terpenics) are always more concentrated than guayulins; the total of the six identified terpenics makes up to 19% of resin in bark which is also the richest part in resin (10% of dry bark). The saponifiable fraction shows ten identified fatty acids (C10 to C21, mainly saturated), about the double of reported fatty acids in literature (C16 and C18, mainly unsaturated).

Mots-clés Agrovoc : Parthenium argentatum, composition chimique, sous-produit, acide gras, résine, lipide, biomasse, latex, acide gras insaturé, impact sur l'environnement, saponification, facteur du milieu, extraction

Auteurs et affiliations

• Palu Serge, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Pioch Daniel, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Tardan Eric, CIRAD-PERSYST-UPR BioWooEB (FRA)
• Punvichai Teerasak, Prince of Songkla University (THA)
• Amor Ali, Association pour les transferts de technologies du Mans (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/605390/)

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