• Title, Summary, Keyword: nano-encapsulation

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Thin Film Encapsulation with Organic-Inorganic Nano Laminate using Molecular Layer Deposition and Atomic Layer Deposition

  • Yun, Gwan-Hyeok;Jo, Bo-Ram;Bang, Ji-Hong;Seong, Myeong-Mo
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.270-270
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    • 2016
  • We fabricated an organic-inorganic nano laminated encapsulation layer using molecular layer deposition (MLD) combined with atomic layer deposition (ALD). The $Al_2O_3$ inorganic layers as an effective single encapsulation layer were deposited at 80 degree C using ALD with alternating surface-saturation reactions of TMA and $H_2O$. A self-assembled organic layers (SAOLs) were fabricated at the same temperature using MLD. MLD and ALD deposition process were performed in the same reaction chamber. The prepared SAOL-$Al_2O_3$ organic-inorganic nano laminate films exhibited good mechanical stability and excellent encapsulation property. The measurement of water vapor transmission rate (WVTR) was performed with Ca test. We controlled thickness-ratio of organic and inorganic layer, and specific ratio showed a lowest WVTR value. Also this encapsulation layer contained very few pin-holes or defects which were linked in whole area by defect test. To apply into real OLEDs panels, we controlled a film stress from tensile to compressive and flexibility defined as an elastic modulus with organic-inorganic ratio. It has shown that OLEDs panel encapsulated with nano laminate layer exhibits better properties than single layer encapsulated in acceleration conditions. These results indicate that the organic-inorganic nano laminate thin films have high potential for flexible display applications.

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The In vitro Effects of Nano-encapsulated Conjugated Linoleic Acid on Stability of Conjugated Linoleic Acid and Fermentation Profiles in the Rumen

  • Heo, Wan;Kim, Eun Tae;Cho, Sung Do;Kim, Jun Ho;Kwon, Seong Min;Jeong, Ha Yeon;Ki, Kwang Seok;Yoon, Ho Baek;Ahn, Young Dae;Lee, Sung Sill;Kim, Young Jun
    • Asian-Australasian Journal of Animal Sciences
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    • v.29 no.3
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    • pp.365-371
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    • 2016
  • This study was aimed to evaluate the stability of conjugated linoleic acids (CLAs) by nano-encapsulation against in vitro ruminal biohydrogenation by microbial enzymatic conversion. CLAs (free fatty acid form of CLA [CLA-FFA], nano-encapsulated CLA-FFA, triglyceride form of CLA [CLA-TG], and nano-encapsulated CLA-TG) were used in the in vitro fermentation experiments. When Butyrivibrio fibrisolvens (B. fibrisolvens) was incubated with CLA-FFAs, the concentrations of cis-9, trans-11 CLA and vaccenic acid (VA) slightly was decreased and increased by nano-encapsulation, respectively. When B. fibrisolvens was incubated with CLA-TG, the concentrations of cis-9, trans-11 CLA and VA decreased, but these were increased when B. fibrisolvens was incubated with nano-encapsulated CLA-TG. The nano-encapsulation was more effective against the in vitro biohydrogenation activity of B.fibrisolvens incubated with CLA-FFA than with CLA-TG. In the in vitro ruminal incubation test, the total gas production and concentration of total volatile fatty acids incubated with nano-encapsulated CLA-FFA and CLA-TG were increased significantly after 24 h incubation (p<0.05). Nano-encapsulated CLA-FFA might, thus, improve the ruminal fermentation characteristics without adverse effects on the incubation process. In addition, nano-encapsulated CLA-FFA increased the population of Fibrobacter succinogenes and decreased the population of B. fibrisolvens population. These results indicate that nano-encapsulation could be applied to enhance CLA levels in ruminants by increasing the stability of CLA without causing adverse effects on ruminal fermentation.

Efficient Transdermal Penetration and Improved Stability of L-Ascorbic Acid Encapsulated in an Inorganic Nanocapsule

  • Yang, Jae-Hun;Lee, Sun-Young;Han, Yang-Su;Park, Kyoung-Chan;Choy, Jin-Ho
    • Bulletin of the Korean Chemical Society
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    • v.24 no.4
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    • pp.499-503
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    • 2003
  • Encapsulation of L-ascorbic acid (vitamin C) within a bio-compatible layered inorganic material was achieved by coprecipitation reaction, in which the layered inorganic lattice and its intercalate of vitamin C are simultaneously formed. The nano-meter sized powders of vitamin C intercalate thus prepared was again encapsulated with silica nano-sol to form a nanoporous shell structure. This ternary nanohybrid of vitamin Clayered inorganic core-$SiO_2$ shell exhibited an enhanced storage stability and a sustained releasing of vitamin C. Furthermore, the nano-encapsulation of vitamin C with inorganic mineral was very helpful in delivering vitamin C molecules into skin through stratum corneum, facilitating transdermal penetration of vitamin C in topical application.

Analysis of Nonclassical Fullerene C24 Regioisomers Encapsulating H2O using Hybrid Density Functional Methods B3LYP and M06-2X

  • Lee, Seol;Lee, Ji Young;Lee, Kee Hag
    • Bulletin of the Korean Chemical Society
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    • v.35 no.3
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    • pp.899-904
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    • 2014
  • The atomic structures and electronic properties of six classical and nonclassical $H_2O$@$C_{24}$ fullerene regioisomers are systematically studied using the hybrid density functional B3LYP method and M06-2X method with empirical dispersion in conjunction with the 6-31G(d,p) basis sets. The charge transfer, frontier orbitals, dipole moment, energy gap between the HOMO and LUMO, and volume change of the $C_{24}$ cage are analyzed upon encapsulation of a $H_2O$ molecule in each $C_{24}$ regioisomer. All encapsulation processes are endothermic and the relative stabilities of six $C_{24}$ fullerene regioisomers change upon encapsulation of $H_2O$.

Enhancement of Anticancer Activities of Ephedra sinica Stapf Extracts by Nano-encapsulation (마황 추출물의 나노 입자화를 통한 항암 활성 증진)

  • Jeong, Hyang-Suk;Kim, Seoung-Seop;Oh, Sung-Ho;Jeong, Myoung-Hoon;Choi, Woon-Yong;Seo, Yong-Chang;Na, Chun-Soo;Kwak, Hyeong-Geun;Lee, Hyeon-Yong
    • Korean Journal of Medicinal Crop Science
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    • v.18 no.3
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    • pp.143-150
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    • 2010
  • This study showed the increase of antitumor activities of water soluble E. sinica extract by nano-encapsulation process with lecithin. Five groups of lecithin only group (LO), lecithin nano-encapsulated E. sinica group (LE), E. sinica only group (EO), one negative control group (NCO) and positive control group (PCO) were set for several anticancer experiment and fed into Sarcoma-180 injected mice. The cytotoxicity of LE on the human normal kidney cell (HEK293) showed 14.8% lower than 19.2% of EO and 18.4% of LO. Growth of human liver carcinoma cell and human stomach carcinoma cell as representative of digestive system in vitro was inhibited up to about 85.1% and 87.3%, in adding 1.0 mg/$m{\ell}$ of LE, which values 15% higher than that from conventional EO. The survival rates of each mice group were 40%, 63%, 48%, 33% and 100%, respectively after 40 days of injecting Sarcoma-180. The increment of their body weights of the extract feeding groups was suppressed down to 10~15%, compared to the negative control. The nano-particles also reduced the hypertrophy of the internal organs such as spleen and liver down to 15~20%, compared to those as the other groups. Among them, LE effectively reduced the size of tumor form to 20%. From these results, in vitro and in vivo antitumor activities of E. sinica could be enhanced by using nano-encapsulation process with lecithin because of better permeation into the cancer cells by confocal observations.

Enhancement of Immune Activities of Natural Water-Soluble Sulforaphane by Nano Encapsulation Process (천연 수용성 설포라판의 나노입자화를 통한 면역 활성 증진)

  • Ha, Ji-Hye;Han, Jae-Gun;Jeong, Hyang-Suk;Oh, Sung-Ho;Kwon, Min-Chul;Choi, Young-Beom;Ko, Jung-Rim;Lee, Hyeon-Yong
    • Korean Journal of Medicinal Crop Science
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    • v.16 no.6
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    • pp.402-408
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    • 2008
  • This study was performed to investigate improving immune activities of natural water-soluble sulforaphane extracted from Brassica oleracea var. italica by nano encapsulation process. The nanoparticles of the sulforaphane extracted with ultrasonification process at $60^{\circ}C$ promoted human B and T cell growth, about $7{\sim}35%$ compared to the control. The secretion of IL-6 and TNF-${\alpha}$ from T cells were also enhanced as $2.6{\times}10^{-4}pg/cell$ and $2.1{\times}10^{-4} pg/cell$, respectively, by the adding nano samples. NK cell activation was improved about 8%, compare to the control in adding cultured medium of T cell added nano samples. It was also found that sulforaphane extracted from B. oleracea var. italica had highly inhibitory activity on hyaluronidase as $IC_{50}$ about $200\;{\mu}g/m{\ell}$. It can be concluded that natural water-soluble sulforaphane samples by nano-encapsulation, each size is 200 nm, extracted from B. oleracea var. italica has high immune activities through higher efficiency of bio-activation than conventional extracts.

Effect of Layer-by-Layer (LbL) Encapsulation of Nano-Emulsified Fish Oil on Their Digestibility Ex Vivo and Skin Permeability In Vitro

  • Jung, Eun Young;Hong, Ki Bae;Son, Heung Soo;Suh, Hyung Joo;Park, Yooheon
    • Preventive Nutrition and Food Science
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    • v.21 no.2
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    • pp.85-89
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    • 2016
  • Omega-3 rich fish oils are extremely labile, thus requiring control of oxidation and off flavor development. A recently proposed emulsification method, layer-by-layer (LbL) deposition, was found to be a plausible method to enhance the characteristics of bioactive ingredients, especially lipids. The present work was designed to test the possibility of enhancing the uptake and utilization of omega-3 fatty acids present in fish oil. The bioavailability of nano-emulsified fish oil was monitored in terms of intestinal absorption as well as skin permeability by using the everted intestinal sac model and Franz cell model. The skin permeability and intestinal absorption characteristics was significantly improved by LbL emulsification with lecithin/chitosan/low methoxypectin. Multilayer encapsulation along with nano-emulsification can be a useful method to deliver biologically active lipids and related components, such as fish oil. The protective effect of this tool from lipid oxidation still needs to be verified.

Enhancement of Immuno Modulatory Activities of Rubus coreanus Miquel Extracts by Nano-encapsulation Process (나노 입자화 한 복분자 저온 추출물의 면역 활성 증진)

  • Han, Jae-Gun;Kwon, Min-Chul;Ha, Ji-Hye;Jeong, Hyang-Suk;Kim, Young;Jeong, Myoung-Hoon;Kim, Jin-Chul;Lee, Hyeon-Yong
    • Korean Journal of Medicinal Crop Science
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    • v.17 no.1
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    • pp.54-60
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    • 2009
  • This study was performed to improve immune activities of Rubus coreanus Miquel by encapsulation of nanoparticles. Immuno-activities of R. coreanus were investigated through aqueous extracts associated with process of water at $60^{\circ}C$. It showed high promotion of human B and T cells growth about 50%, compared to the case of other conditions. The secretion of IL-6 and TNF-${\alpha}$ was also enhanced as $2.44{\times}10^{-4}$pg/cell and $1.94{\times}10^{-4}$pg/cell, results by adding nano samples. NK cell activation was improved up to 29% higher than the conventional extraction process. The secretion of NO from macrophage showed 14.9 ${\mu}M$ on the nano-encapsulation process extracts, which was higher than others. The size of nanoparticles was in the range of 50${\sim}$300 nm, which can effect the penetration into the cells. It was clearly observed by real time confocal microscope.

Synthesis and Process Development of Ultrafine Ti Powder by Sodium Flame Encapsulation Method (Sodium Flame Encapsulation 방법에 의한 초미립 Ti 분말 합성 및 공정개발)

  • Maeng, Deok-Yeong;Lee, Chang-Gyu;Kim, Heung-Hui
    • Korean Journal of Materials Research
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    • v.12 no.5
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    • pp.391-397
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    • 2002
  • Synthesis and process development of nano-size Ti powder by SFE(Sodium/halide Flame Encapsulation) method were investigated. Four concentric coflow burner was used and its flame configuration was $TiCl_4/Ar/Na/Ar$ in order from the center. Flame has been controlled by the various processing parameters such as temperature of burner and flow rates of both $TiCl_4$(g) precursor and Na(g). It was found that yellow-colored flame was shown in the flow rates of 70cc/min of $TiCl_4$(g) precursor and 2 $\ell$ /min of Na(g) which were regarded as optimum flame condition. The powders encapsuled by NaCl were produced having the average powder size of 250nm. The results of X-ray diffraction showed that powders from the optimized condition consisted of pure Ti and NaCl. TEM analysis confirmed that the several Ti powders of 20-100nm were encapsulated with NaCl. After removing sodium chloride by heat treatment, the spherical Ti powders with the size range of 80 to 150nm were obtained.

Preparation of Polymer/Drug Nano- and Micro-Particles by Electrospraying

  • Lee, Jong-Hwi;Park, Chul-Ho;Kim, Min-Young;Yoo, Ji-Youn;Kim, Ki-Hyun;Lee, Jong-Chan
    • Proceedings of the Polymer Society of Korea Conference
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    • pp.217-217
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    • 2006
  • The surface energy control capability of electrohydrodynamic force provides electrospraying with various potential advantages such as simple particle size control, mono-dispersity, high recovery, and mild processing conditions. Herein, the one step nano-encapsulation of protein drugs using electrospraying was developed. The major processing parameters such as the conductivity of spraying liquids, flow rate, the distance between electric potentials, etc were examined to obtain the maximum efficiency. The recovery of particles was found relatively high as could be conjectured based on the principle of electrospraying. When organic solvents were employed, the processing windows of electrospraying were relatively narrow than water systems. Efficient nano-encapsulation of BSA with polymers was conveniently achieved using electrospraying at above 12 kV.

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