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Synthesis of biosurfactants / Mercedes Martinez in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6609–6614 Titre : Synthesis of biosurfactants : enzymatic esterification of diglycerol and oleic acid. 1. kinetic modeling Type de document : texte imprimé Auteurs : Mercedes Martinez, Auteur ; Rubén Oliveros, Auteur ; José Aracil, Auteur Année de publication : 2011 Article en page(s) : pp 6609–6614 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Biosurfactants  Enzyme  Kinetic Résumé : The growing application of environmentally friendly products raised in the last few years has increased the interest in biodegradable nonionic surfactant products. As an example of these, polyglycerol fatty acid esters have a wide field of application in many industries as additives of cosmetics, food, photography, inks, etc. Also, the huge range of possible raw materials for these products increases cited interest. The esterification of diglycerol with oleic acid using an enzyme (NOVOZYM-435) as catalyst was studied in this work. Several experiments were carried out at different temperatures, catalyst concentrations, and acid/alcohol molar ratios. A pseudo-second-order kinetic model, including Langmuir adsorption factors for the acid, was developed. The results show that this proposed kinetic model reproduces the experimental data with a maximum 10% error. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102560b [article] Synthesis of biosurfactants : enzymatic esterification of diglycerol and oleic acid. 1. kinetic modeling [texte imprimé] / Mercedes Martinez, Auteur ; Rubén Oliveros, Auteur ; José Aracil, Auteur . - 2011 . - pp 6609–6614. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp 6609–6614 Mots-clés : Biosurfactants  Enzyme  Kinetic Résumé : The growing application of environmentally friendly products raised in the last few years has increased the interest in biodegradable nonionic surfactant products. As an example of these, polyglycerol fatty acid esters have a wide field of application in many industries as additives of cosmetics, food, photography, inks, etc. Also, the huge range of possible raw materials for these products increases cited interest. The esterification of diglycerol with oleic acid using an enzyme (NOVOZYM-435) as catalyst was studied in this work. Several experiments were carried out at different temperatures, catalyst concentrations, and acid/alcohol molar ratios. A pseudo-second-order kinetic model, including Langmuir adsorption factors for the acid, was developed. The results show that this proposed kinetic model reproduces the experimental data with a maximum 10% error. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102560b