• Title/Summary/Keyword: Microencapsulation

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Microencapsulated Ascorbic Acid for Milk Fortification

  • Lee, J.B.;Ahn, J.;Kwak, H.S.
    • Archives of Pharmacal Research
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    • v.26 no.7
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    • pp.575-580
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    • 2003
  • The present study was designed to develop a microencapsulated L-ascorbic acid and iron that could be used to fortify milk and to determine the sensory properties of milk fortified with microencapuslation. Coating material was medium-chain triacylglycerol (MCT), and selected core material was ferric ammonium sulfate and L-ascorbic acid. The highest efficiency of microencapsulation was 95.0% in the ratio of 15:1 as coating to core material. Ascorbic acid release was increased sharply up to 5 d storage as 6.5%. TBA value was the lowest when both capsulated iron and ascorbic acid were added during 12 d storage, compared with other treatments. In sensory analysis, most aspects were not significantly different between control and capsulated ascorbic acid fortified milk at 5 d storage. The present study indicated that the use of microencapsulated ascorbic acid with MCT is effective for fortifying milk. In addition, these results suggest that acceptable milk products can be prepared with microencapsulated ascorbic acid and iron.

Preparation of Silica Microcapsules containing Water-Soluble UV Absorbers by a W/O Microemulsion Sol-Gel Process (W/O 마이크로에멀젼 졸-겔 법을 이용한 수용성 UV 흡수제를 함유한 실리카 마이크로캡슐의 제조)

  • 함경국;안복엽;석상일
    • Proceedings of the Materials Research Society of Korea Conference
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    • 2003.03a
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    • pp.220-220
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    • 2003
  • The microencapsulation of droplets or particles within a solid shell leads to the formation of core-shell particles. Microencapsulation provides protection and controlled release of core materials such as drugs, vitamins, enzymes, perfumes, and the like. Such particles have, therefore, found a diverse range of applications in the pharmaceutical, agricultural, cosmetic, and food industries. UV absorbers are widely used for cosmetics to screen out ultra violet (UV) rays which have side effects on human skin. The absorbers are made generally from synthetic organic compounds, which can stimulate the human skins to develop allergic phenomena.

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A Study of Antibacterial and Aromatic Fibers Vsing Microencapsulation of Antibiotics and Perfume (1) -Microencapsulation of Antibiotics/Perfume- (항균제 및 향료의 마이크로캡슐을 이용한 항균 . 방향섬유에 관한 연구(1) -항균제/향료의 마이크로캡슐화 -)

  • Kim, Ho-Jung;Park, Cha-Cheol;Kim, Han-Do
    • Journal of the Korean Society of Clothing and Textiles
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    • v.20 no.3
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    • pp.512-518
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    • 1996
  • Microcapsules containing 2, 4, 4'-trichloro-2-hydroxydiphenyl ether and perfumes were prepared by the coacervation using poly (vinyl alcohol) and crosslinking agents. Effects of dispersing agents, core materials, agitating speed and crosslinking agents on microcapsule size were investigated. The mean and deviation of microcapsule diameters decreased with increasing agitation speed. The diameters of m;crocapsules decreased with increasing dispering agent concentration at 6, 000 rpm of agitation speed, but it was not changed at 10, 000 rpm. The dispering effect of PVA is better than that of gum arabic. The slight increase in the diameter of microcapsule was observed when the amount of core material was increased. As the amount of crosslinking agent was increased, the diameter of microcapsule was decreased.

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Development of Susceptible Functional Fibers Using Microencapsulation of Susceptible Materials(III) ―Fragrant Functional Fibers― (감성물질의 마이크로캡슐화에 의한 감성기능 섬유의 개발(III) -방향 기능 섬유-)

  • Kim, Moon Sik;Park, Soo Min
    • Textile Coloration and Finishing
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    • v.8 no.4
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    • pp.11-18
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    • 1996
  • Natural functional compound in the textile finishing for health and amenity using fragrant material have been applied by microencapsulation method. The microcapsules containing fragrant materials as functional compound were produced by in situ polymerization using urea-formaldehyde prepolymer. The average diameter of microcapsules is 2.75$\mu$ and particle size ranges over 0.5~10$\mu$. Fragment material is extracted approximatly proportioned from microcapsule at room temperature. The adsorption of microcapsule was improved by pretreatment of cationic agent. Fragrant materials in microcapsule was revealed to have long release time.

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Encapsulation of Flavors by Molecular Inclusion Using $\beta$-Cyclodextrin: Comparison with Spray-drying Process Using Carbohydrate-based Wall Materials

  • Cho, Young-Hee;Park, Ji-Yong
    • Food Science and Biotechnology
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    • v.18 no.1
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    • pp.185-189
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    • 2009
  • Microencapsulation of flavor was carried out by molecular inclusion process using $\beta$-cyclodextrin (${\beta}CD$). ${\beta}CD$-flavor complex was prepared at various flavor-to-${\beta}CD$ ratios (1:6-1:12) to determine the effect of ${\beta}CD$ concentration on the inclusion efficiency. Maximum total oil retention and minimal surface oil content were obtained at flavors to ${\beta}CD$ ratio of 1:10. The physical properties and controlled release pattern of flavors from ${\beta}CD$-flavor complex were measured and compared with spray-dried microcapsules prepared using carbohydrate wall system. ${\beta}CD$-flavor complex showed higher total oil retention and surface oil contents, smaller mean particle size, lower moisture uptake, and higher oxidation stability than spray-dried microcapsule. Oxidative stability of flavor was correlated with hygroscopicity of wall materials. The controlled release mechanism was highly affected by temperature and characteristics of wall materials.

Improvement of the Stability of Lactobacillus casei YIT 9018 by Microencapsulation Using Alginate and Chitosan

  • Koo, Sun-Mo;Cho, Young-Hee;Huh, Chul-Sung;Baek, Young-Jin;Park, Ji-Yong
    • Journal of Microbiology and Biotechnology
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    • v.11 no.3
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    • pp.376-383
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    • 2001
  • Lactobacillus casei YIT 9018 was microencapsulated within alginate or alginate/chitosan double membrane using an air atomizer. Microbiological analysis revealed that the viability of encapsulated L. casei in gastric juice, hydrogen peroxide, and pepsin was 2-3 log cycle higher than that of the nonencapsulated cell. However, the encapsulated cells did not show a signifciant increase in survival when subjected to in virto high acid and 0.6% bile salt condition. Alginate-encapsulated, alginate/chitosan-encapsulated, and nonencapsulated cells were stored at different temperatures eencapsulated cells showed similar stability at $4^{\circ}C$. However, at $22^{\circ}C$, the alginate/chitosan-encapsulted cell was the most stable.

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The Development of Microparticle Feed Using Microencapsulation (Microencapsulation을 이용한 미립자 사료개발)

  • 이은주;김성구
    • Journal of Life Science
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    • v.6 no.2
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    • pp.129-134
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    • 1996
  • The development of fish feed is essential to aquaculture. Recently, yeast, dhlorella and plankton have been studied and development as the feed of the fry fishes, But, these biological feeds cause the nutritional unbalance to fry fishes, rotifer or artemia. Therefore, to solve these problems, microcapsules with micron sizes were prepared for enhancing the nutritional values of artemia and rotifer which are used as the feed of fry fishes. Microparticle oil capsules were prepared by the complex coacervation technique. The method to make the optimal size of microcapsule which the artemia and rotifer can be easily taken was wvaluated. The size of oil microcapsule in the range of 5-70$\mu$m was obtained by the agitation conditions during coacervation. Capsule size and size distribution were dependent on the agitation speed and agitation time, respectively.

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Effects of Aluminum Tristearate in the Preparation of Sustained Release Ethambutol Hydrochloride Microcapsules (지속 방출형 염산에탐부톨 마이크로캅셀의 제조에 있어서 스테아린산알루미늄의 효과)

  • Yoo, Bong-Shin
    • Journal of Pharmaceutical Investigation
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    • v.18 no.4
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    • pp.175-180
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    • 1988
  • The role and effect of aluminum tristearate in microencapsulation were investigated based on the dispersion system of ethambutol hydrochloride in acetone-liquid paraffin. Eudragit RS was used as a wall-forming material. Eudragit RS microcapsules prepared using aluminum tristearate were uniform, free-flowing particles. The phase diagram of ethambutol hydrochloride-Eudragit RS-aluminum tristearate indicated that spherical microcapsules ranging from 250 to 1400 ${\mu}m$ in diameter could be prepared only in a very limited region. Instrumental analysis using an energy dispersive-type X-ray microanalyser and a scanning electron microscope showed that aluminum tristearate was localized near the surface of microcapsules. From these results, it was presumed that aluminum tristearate reduced the phase tension between Eudragit microcapsules and liquid paraffin. The dissolution rates of ethambutol hydrochloride from Eudragit RS microcapsules were consideraly lower than those from ethambutol hydrochloride powders and decreased as the amount of aluminum tristearate decreased.

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Encapsulation of Bromelain in Liposome

  • Lee, Dong-Hoon;Jin, Bong-Hwa;Hwang, Yong-Il;Lee, Seung-Cheol
    • Preventive Nutrition and Food Science
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    • v.5 no.2
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    • pp.81-85
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    • 2000
  • Bromelain has been used as a meat-tenderizing agent in food processing. To increase the availability of bromelain, microencapsulation into liposome was carried out by the dehydration and rehydration method. Small unilamellar vesicles prepared by sonication treatment showed higher encapsulation efficiency (EE) than by the French press method. In the preparation of liposome, the effect of pH and centrifugal force on EE was also investigated and it showed a higher EE at acidic pH than at alkaline pH with centrifugation at 80, 000$\times$g. The actual EEs except unencapsulated bromelain which bound on the outside surface of liposome by electrostatic interaction also were investigated, and the optimal EE was at pH 4.6, at 0.6 of a ratio of bromelain to phosholipid(18.2%, w/w). Release of bromelain from liposomes was stimulated as the temperature increased at neutral pH.

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