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Co-precipitation of β-carotene and polyethylene glycol with compressed CO2 as an antisolvent / Facundo Mattea in Industrial & engineering chemistry research, Vol. 47 n°11 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3900–3906 Titre : Co-precipitation of β-carotene and polyethylene glycol with compressed CO2 as an antisolvent : effect of temperature and concentration Type de document : texte imprimé Auteurs : Facundo Mattea, Auteur ; Angel Martin, Auteur ; Maria J. Cocero, Auteur Année de publication : 2008 Article en page(s) : p. 3900–3906 Note générale : Bibliogr. p. 3906 Langues : Anglais (eng) Mots-clés : β-carotene;  Polyethylene  glycol;  X-ray  diffraction;  Differential  scanning  calorimetry;  Scanning  electron  microscopy Résumé : In this work, the coprecipitation of β-carotene and polyethylene glycol (PEG) is studied. First, the effect of pressure and temperature was studied (pressures of 8−12 MPa, temperatures of 288−313 K), Afterward, the effect of the initial concentration of the different substances on the morphologies of the particles was studied. X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) analysis were used to observe the nature of the particles that were obtained. The results indicated the sensitivity of the precipitation to temperature, making impossible to obtain particles at temperatures above 288 K. With regard to the concentration effect on the morphology of the particles, it was possible to obtain different morphologies just by changing the concentration ratio between the substances. Also, the analysis of the coprecipitates indicated that the β-carotene inside the polymer matrix must be in an amorphous form. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071326k [article] Co-precipitation of β-carotene and polyethylene glycol with compressed CO2 as an antisolvent : effect of temperature and concentration [texte imprimé] / Facundo Mattea, Auteur ; Angel Martin, Auteur ; Maria J. Cocero, Auteur . - 2008 . - p. 3900–3906. Bibliogr. p. 3906 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°11 (Juin 2008) . - p. 3900–3906 Mots-clés : β-carotene;  Polyethylene  glycol;  X-ray  diffraction;  Differential  scanning  calorimetry;  Scanning  electron  microscopy Résumé : In this work, the coprecipitation of β-carotene and polyethylene glycol (PEG) is studied. First, the effect of pressure and temperature was studied (pressures of 8−12 MPa, temperatures of 288−313 K), Afterward, the effect of the initial concentration of the different substances on the morphologies of the particles was studied. X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) analysis were used to observe the nature of the particles that were obtained. The results indicated the sensitivity of the precipitation to temperature, making impossible to obtain particles at temperatures above 288 K. With regard to the concentration effect on the morphology of the particles, it was possible to obtain different morphologies just by changing the concentration ratio between the substances. Also, the analysis of the coprecipitates indicated that the β-carotene inside the polymer matrix must be in an amorphous form. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie071326k