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Study of the lipase-catalyzed esterification of stearic acid by glycerol using in-line near-infrared spectroscopy / Marcelo Blanco in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 6957–6960 Titre : Study of the lipase-catalyzed esterification of stearic acid by glycerol using in-line near-infrared spectroscopy Type de document : texte imprimé Auteurs : Marcelo Blanco, Auteur ; David Zamora, Auteur Année de publication : 2009 Article en page(s) : pp. 6957–6960 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Near-infrared  spectroscopy  Stearic  acid  Heterogeneous  catalyst Résumé : The potential of near-infrared (NIR) spectroscopy for monitoring the esterification of stearic acid by glycerol in a laboratory reactor was assessed. The reaction was conducted in the presence of a heterogeneous catalyst that consisted of lipase from Candida antarctica immobilized on a macroporous resin (Novozyme 435). The reaction leads to a produce a mixture of monostearate and especially distearate; no formation of tristearate occurs. The process was monitored using a fiber-optic probe to record NIR spectra for the reaction mixture at variable times. The spectra thus obtained were used to construct and validate PLS calibration models for predicting the glycerin, stearic acid, and glycerol monostearate and distearate concentrations. The ensuing method allows concentration changes in the four compounds to be monitored in real time. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900406x [article] Study of the lipase-catalyzed esterification of stearic acid by glycerol using in-line near-infrared spectroscopy [texte imprimé] / Marcelo Blanco, Auteur ; David Zamora, Auteur . - 2009 . - pp. 6957–6960. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 6957–6960 Mots-clés : Near-infrared  spectroscopy  Stearic  acid  Heterogeneous  catalyst Résumé : The potential of near-infrared (NIR) spectroscopy for monitoring the esterification of stearic acid by glycerol in a laboratory reactor was assessed. The reaction was conducted in the presence of a heterogeneous catalyst that consisted of lipase from Candida antarctica immobilized on a macroporous resin (Novozyme 435). The reaction leads to a produce a mixture of monostearate and especially distearate; no formation of tristearate occurs. The process was monitored using a fiber-optic probe to record NIR spectra for the reaction mixture at variable times. The spectra thus obtained were used to construct and validate PLS calibration models for predicting the glycerin, stearic acid, and glycerol monostearate and distearate concentrations. The ensuing method allows concentration changes in the four compounds to be monitored in real time. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900406x