Autor(es)

Machado, L. C. ^[1] ; Pelegati, V. B. ^[2] ; Oliveira, A. L. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Engn Alimentos, FZEA, BR-13635900 Pirassununga, SP - Brazil

^[2] INFABiC Natl Inst Sci & Technol Photon Appl Cell, BR-13083859 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF SUPERCRITICAL FLUIDS; v. 107, p. 260-269, JAN 2016.
• Citações Web of Science: 3

Resumo

Supercritical CO2 was studied for impregnation or encapsulation of essential oils in modified starches via Particle from Gas Saturated Solutions or Suspensions (PGSS). Modified starches were choose as function of its low cost. The advantage of this method over conventional encapsulation that use modified starch via spray drier refers to the low temperatures used and absence of water in the process. Modified starch presents hydrophobic elements and this molecules present amphiphilic character. Usually it is employed in the encapsulation of essences as wall material with excellent volatiles retention due to its polar and nonpolar interface. Considering its hydrophobic characteristics, interactions between the modified starch and supercritical CO2 occurred, resulting in two different structural interactions of the limonene and modified starch in the PGSS (50 degrees C and 60 degrees C at 100 bar and 120 bar). When hydrous ethanol was used in the suspension, impregnation occurred and, when anhydrous ethanol was used, encapsulation occurred. Analysis of particle morphology via scanning electron and confocal microscopy, thermo-oxidative characterization by differential scanning calorimetry and determination of microencapsulated limonene via gas chromatography coupled to mass spectrometry indicated limonene microencapsulation and impregnation occurred despite the highly solubility of limonene in supercritical CO2. The retention of limonene by Purity Gum Ultra (R) was 86% when encapsulated and, 53% when impregnated, similar values to those obtained in conventional microencapsulation methods via a spray drier or via PGSS-drying. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/01221-8 - Estudo da formação de partículas de limoneno em maltodextrina usando ress (rapid expansion of supercritical solutions)
• Beneficiário: Luciana Cristina Machado
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 10/16665-3 - Extração de óleo de grãos de café verdes por fluido supercrítico, fluido pressurizado e comparação de sua composição com o óleo de café obtido por prensagem dos grãos pelos pequenos produtores do estado de São Paulo - análise da concentração de diterpenos
• Beneficiário: Alessandra Lopes de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/00148-0 - Obtenção e análise de extratos de sementes de pitanga (Eugenia uniflora L.) obtidos pelo emprego de dióxido de carbono supercrítico
• Beneficiário: Alessandra Lopes de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/06981-0 - Estudo da formação de partículas e encapsulação usando RESS (Rapid Expansion of Supercritical Solutions)
• Beneficiário: Alessandra Lopes de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular