Influence of emulsification methods and use of colloidal silicon dioxide on the microencapsulation by spray drying of turmeric oleoresin in gelatin-starch matrices

Autor(es)

Ferreira, Sungil ; Malacrida, Cassia R. ; Telis, Vania R. N.

• Tipo de documento: Artigo Científico
• Fonte: CANADIAN JOURNAL OF CHEMICAL ENGINEERING; v. 94, n. 11, p. 2210-2218, NOV 2016.
• Citações Web of Science: 5

Resumo

Microencapsulated turmeric oleoresin can present improved curcumin stability and be easily applied in hydrophilic systems. Most of the microencapsulation techniques rely on the initial emulsification of the core material in the wall biopolymers and this step affects the encapsulation efficiency and properties of the resulting microcapsules. The objective of this work was to evaluate the effects of different emulsification methods, the use of colloidal silicon dioxide and Tween 80 as additives, and the rheological behaviour of the encapsulating gelatin-starch dispersions on the emulsion stability, encapsulation efficiency, and yield of turmeric oleoresin microcapsules produced by spray-drying. The encapsulating matrices were prepared with varied concentrations of modified starch (from 0.22-0.317g/g (22-31.7wt%), dry basis) and gelatin (0-0.06g/g (0-6wt%), dry basis). The microstructure of the emulsions was evaluated through optical microscopy and small amplitude oscillatory shear rheology. The emulsification of turmeric oleoresin was performed by the following methods: high-shear mixing, using a rotor-stator homogenizer, with and without addition of Tween 80 as a surfactant; and by ultrasound homogenizer with and without the colloidal silicon dioxide (Aerosil 200). The homogenization method presented considerable influence on the emulsion stability and on the average droplet sizes in the emulsion. The concentration of gelatin directly affected the emulsion and microcapsule properties. Ultrasound homogenization and the use of colloidal silicon dioxide resulted in the highest encapsulation efficiency of turmeric oleoresin in the low total-solid formulations. (AU)

• Processo FAPESP: 10/20731-1 - Otimização da etapa de emulsificação na microencapsulação de oleoresina de cúrcuma em matrizes de gelatina/maltodextrina e gelatina/amido modificado
• Beneficiário: Sungil Ferreira
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 09/16847-7 - Estabilidade da oleoresina de cúrcuma (Curcuma longa L.) microencapsulada em matrizes de gelatina, maltodextrina e amido modificado
• Beneficiário: Cassia Roberta Malacrida Mayer
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 10/09614-3 - Efeito das propriedades físico-químicas das matrizes encapsulantes e da aplicação de ultrassom na estabilidade da oleoresina de cúrcuma (Curcuma longa L.) microencapsulada
• Beneficiário: Vânia Regina Nicoletti Telis
• Modalidade de apoio: Auxílio à Pesquisa - Regular