uggs Spray drying technology _2461

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Spray Drying

Feed the need to protect the core flavors wrapped in a bag micro-capsules, feed flavors wrapped through the porous wall slowly out on the penetration and diffusion. To prolong the effect of flavor. Process of preparation of microcapsules, spray drying method is commonly used and most economical one. In this paper, spray drying microencapsulation technology to make an introduction. Microencapsulation of a principle of spray drying and spray drying microencapsulation of basic steps method is to sac the core material dispersed in the wall material formed in Los liquid emulsion, the emulsion after atomized into fine droplets dispersed in the spray dryer hot air stream inside. Instantaneous temperature by rapid evaporation of the water, wall solidification, capsule core material to be coated and form in which the microcapsules. Basic steps: 1 Preparation of core material in proportion to the gate and wall material properties of mixed units; 2 Jing joined the emulsion, the emulsion under the action of homogeneous emulsifier to form a uniform O / W (oil in water type) emulsion; 3. Into the spray dryer, atomized liquid of the Luo,[link widoczny dla zalogowanych], the formation of tiny droplets; 4. Use of hot air rapidly to evaporation, the droplets formed on the surface membrane, drying the formation of products. Second, the available material embedded microcapsules embedded in materials, but generally choose must have the following characteristics; 1. Can form a stable emulsion; 2. Can form a wall film; 3. Moisture absorption is very small; 4. Emulsion formed when the viscosity of the solution must be low; 5. Odorless,[link widoczny dla zalogowanych], water released when the core material of the embedding. Now briefly introduce several embedded material. 1 modified starch modified starch is mainly the use of plant starch such as corn starch and other by chemical modification to fit the flavor and other core materials such as microcapsules. Are usually for its emulsifying ability was modified so that both hydrophobic and hydrophilic functional groups. Lemon oil with its embedded nature either from the emulsion,[link widoczny dla zalogowanych], the oil retention volume and surface area superior than gum arabic. 2. CD Dim �� Apartments LZliliD female sIM: �� N0. j �� 2 CD Xun Portugal by D-glucose to q-l, 4 from the beam of a glucoside bond connecting the ring polysaccharides. Degree of polymerization is generally 7 D-cyclodextrin glucose units, which is softened by the starch produced by Bacillus enzyme system of glucose transport taken, obtained by ion change resin purification. Very special nature of CD and its center is a hydrophobic molecule, but molecules, compared to hydrophilic. When the presence of water, cyclodextrin molecules in a lively and easy to like exhausted other molecules when inhaled its central location, to form encapsulation complexes. If the core material stronger hydrophobic molecules, binding capacity of its embedded objects also stronger. The embedding material fI! E Dry anhydrous state is very stable, the general decomposition needs to occur at 200 ��. For this reason, recently in the method of microencapsulation is used more as additives. 3 Arabic gum Arabic gum is a gel obtained from plants are used as food ingredients and additives. It has good water solubility. Concentration of 50% can dissolve in acidic conditions, F is stable. Gum Arabic is very good film, but the higher prices, limiting their use. Emblem of spray drying encapsulation of three main factors 1. Concentration and viscosity of materials, spray drying emulsion total solids concentration is very important, the concentration is too large, the liquid tends to operate because of its viscosity is too large, so spraying is not effective. However, large concentrations can make the embedding more efficient. Therefore, the general use of the concentration of 3O% ~ 5O%. 2. The concentration of the added core material. The amount of core material generally used for the tank for a village of the weight of lO% 2o%, the embedding best. 3. Emulsifier selection,[link widoczny dla zalogowanych], selection of appropriate sets of lF Jing emulsion to form a stable emulsion is very important. 4. Drying temperature and drying rate, experiments showed that the inlet temperature at 160 ~ 210 �� and exit temperature is maintained at 8O when a 9o ��. Have good results, while into the wind will also affect the drying effect. 5. Spray pressure, when the wind speed is constant, the liquid velocity and spin state directly affected by the pressure of high-pressure pump the size of the supply constraints in the operation, the liquid velocity and rotational velocity increases with pressure. ��

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