Abstract
It was tried to prepare the microcapsules containing grape polyphenol with the spray drying method followed by the layer-by-layer method. As grape polyphenol was water soluble, the spray drying method was adopted to obtain the higher content. As the shell material of the first microcapsules prepared by the spray drying method, palmitic acid with the melting point of 60°C was adopted in order to prevent grape polyphenol from dissolution into water. As the shell material of the second microcapsules prepared by the layer-by-layer method, chitosan was used to coat the first microcapsules and to give the microcapsules alcohol resistance. In the experiment, the spray drying conditions such as the inlet temperature and the spraying pressure, the oil soluble surfactant species and the chitosan concentration were changed. The mean diameters of microcapsules could be controlled in the range from 5 μm to 35 μm by changing the spraying pressure and the inlet temperature. The yield of microcapsules and the microencapsulation efficiency over 50% could be obtained under the conditions of P = 1.0 kgf/cm2 and Tin = 100°C. Furthermore, the microencapsulation efficiency could be increased by adding the oil soluble surfactant with the larger HLB value. Coating with chitosan could considerably increase alcohol resistance.
Highlights
IntroductionMany kinds of microcapsules have been prepared with the chemical and the physicochemical method and applied in various fields such as latent heat storage, cosmetics, foods, drugs, paintings, adhesives, textile, electric materials and so on [1]-[3]
Many kinds of microcapsules have been prepared with the chemical and the physicochemical method and applied in various fields such as latent heat storage, cosmetics, foods, drugs, paintings, adhesives, textile, electric materials and so on [1]-[3].The main functions of microcapsules are to protect the core materials from environment for the desired time, to optionally release the core materials according to appropriate stimuli and to modify the surface of core materials [1]-[3]
If grape polyphenol could be microencapsulated with some edible shell materials and released by appropriate stimulus, it should be expected that the application fields of grape polyphenol will be considerably extended
Summary
Many kinds of microcapsules have been prepared with the chemical and the physicochemical method and applied in various fields such as latent heat storage, cosmetics, foods, drugs, paintings, adhesives, textile, electric materials and so on [1]-[3]. The main functions of microcapsules are to protect the core materials from environment for the desired time, to optionally release the core materials according to appropriate stimuli and to modify the surface of core materials [1]-[3] The microcapsules with these functions can be prepared by selecting the core and the shell materials with the desired chemical and physicochemical properties and by developing the microencapsulation procedure. In these microencapsulation methods, the spray drying method has been generally utilized to prepare various powdery composite particles and microcapsules, because the products with stable quality can be continuously manufactured in large quantities [4]-[6]. Mechanical pressure, temperature, water, pH, specified enzyme and ultra violet ray have been utilized according to the physical properties of shell materials. The purposes of this study are to prepare the microcapsules containing grape polyphenol with the spray drying method, to coat the microcapsules with chitosan by the layer-by-layer method and to characterize the microcapsules
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