• Title/Summary/Keyword: biodegradable

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Biodegradable Polymer-Nanoceramic Composite for Bone Regeneration

  • Kim, Sang-Soo;Park, Min-Sun;Kim, Byung-Soo
    • Proceedings of the Polymer Society of Korea Conference
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    • 2006.10a
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    • pp.179-179
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    • 2006
  • PLGA/HA composite scaffold fabricated by GF/PL method showed enhanced mechanical property, hydrophilicity and osteoconductivity compared with the SC/PL scaffolds, and this enhancement was most likely due to a higher extent of exposure of HA particles to the scaffold surface. The biodegradable polymer/bioceramic composite scaffolds fabricated by the GF/PL method could enhance bone regeneration efficacy for the treatment of bone defects compared with conventional composite scaffolds.

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Controlled Drug Release Using Biodegradable Polymer (체분해성 고분자를 이용한 약물의 조절방출)

  • Na, Jae Woon;Cha, Wol Suk;Kim, Sun Il
    • KSBB Journal
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    • v.5 no.4
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    • pp.377-382
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    • 1990
  • The characteristics controlled drug release have been studied for biodegradable polymer matrix. Polymer matrix was prepared from glycerine, prednisolone and dextran. Mathematical analysis of the data showed that the release behavior actually conformed to the Higuchi's diffusion controlled model. The release time was increased as drug loading doses increased, whereas decreased as glycerine concentration increased. The release rate did not change by varying molecular weight of dextran.

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Structural Changes of Poly(tetrametylene succinate)/Polycarbonate copolymers on Hydrolysis (Poly(tetrametylene succinate)/Polycarbonate copolymer의 가수분해시의 구조변화)

  • Wanduk Lee;Min Shin;Seungsoon Im
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.10b
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    • pp.209-210
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    • 2003
  • The durability and anti-microbial stability of plastics, which have been thought to be favorable characteristics, cause ecoloical problems due to non-degradation after disposal. For a possible solution of these ecological and environmental problems, the biodegradable polymers. especially aliphatic polyesters, have been widely investigated. Poly(tetramethylene succinate)(PTMS) is one of the most promising biodegradable polyesters. (omitted)

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Biodegradable Characteristics of Starch-filled Polyethylene Film by Fungi (전분이 함유된 폴리에틸렌 필름의 곰팡이에 의한 생분해 특성)

  • 김재현;박태현
    • KSBB Journal
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    • v.9 no.4
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    • pp.412-417
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    • 1994
  • The biodegradable characteristics of starch-filled polyethylene film by fungi were investigated. Aspergillus niger showed the highest cell growth among five species of fungi used in the experiment. Higher starch content gave the higher growth rate of A. niger; however, the kind of film or cutting direction did not give any effects on the cell growth. The use of vinyl trimethoxysilane for the stronger binding of starch and polyethylene did not inhibit the cell growth. When the starch content was higher than 10%, the elongation of the film decreased significantly after the growth of microorganism in the case of transverse direction samples.

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Application of biodegradable metal based drug delivery carrier on Foot and Mouth Disease vaccination in pigs (돼지에서 생체 분해 금속성 전달체를 활용한 구제역 백신의 적용 연구)

  • Cho, Ara;Oh, Sang-Ik;Choe, Changyong;Jung, Young-Hun;Do, Yoon Jung;Kim, Suhee;Choo, Hyun Wook;Gu, Jong Su;Chung, Woo-Jin;Cho, Sung Youn;Yoo, Jae Gyu
    • Korean Journal of Veterinary Service
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    • v.43 no.3
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    • pp.129-137
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    • 2020
  • In this study, we applied biodegradable drug delivery carries (BDDC) for food-and-mouth (FMD) vaccination. After FMD vaccination using BDDC, we estimated the percentage inhibition (PI) of antibody, decomposed patterns, and histopathologic features of BDDC. PI of antibody was higher than 50 at two weeks after injection and sustained positive PI until 10 weeks after injection. BBDC injection group showed significantly an increased pattern of blood monocyte at two and three weeks after injection. According to the Micro CT, micro-cracks were observed at two weeks after injection and the morphology of BDDC was lost at four weeks after injection. For histopathological examination, acute inflammation with neutrophil infiltration and micro-metallic residues were observed around BDDC until four weeks after injection and inflammatory responses gradually decreased at 10 weeks. Based on our experiment, BDDC is considered as an alternative way to vaccine injection for veterinary applications. Our study can be used as basic data for the drug delivery system using biodegradable metals in the future.

A Study of 2D Micro-patterning of Biodegradable Polymers by MEA (Multi Electrode Array)-based Electrohydrodynamic (EHD) printing (다중 전극 어레이 기반 전기수력학 인쇄 기술을 이용한 생분해성 고분자의 2차원 마이크로 패터닝 연구)

  • Hwang, Tae Heon;Ryu, WonHyoung
    • Particle and aerosol research
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    • v.13 no.3
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    • pp.111-118
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    • 2017
  • Electrohydrodynamic (EHD) printing with the aid of strong electric fields can generate and pattern droplets that are smaller than droplets by other printing technologies. Conventional EHD printing has created two-dimensional (2D) patterns by moving its nozzle or a substrate in X and Y directions. In this study, we aimed to develop an EHD system that can create 2D patterns using a multielectrode array (MEA) without moving a nozzle or substrate. In particular, printing ink mixtures of biodegradable polymers and model dyes was patterned on a thin film made of another biodegradable polymer. Without movement of a nozzle and substrate, stable 2D patterning of minimum $6{\mu}m$ size over a range of about 1 mm away from the nozzle position was achieved by MEA control only. We also demonstrated the possibility of denser 2D pattering of the ink mixtures by moving a target substrate relative to MEA position.

Assessment of the Organic and Nitrogen Fractions in the Sewage of the Different Sewer Network Types by Respirometric Method (미생물 호흡률 측정에 의한 관거시스템 유형별 하수의 기질 분율 평가)

  • Park, Jong-Bu;Hur, Hyung-Woo;Kang, Ho;Chang, Sung-Oun
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.8
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    • pp.649-654
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    • 2009
  • Respirometric analysis of domestic sewage by measuring oxygen uptake rate(OUR) was carried out for the experimental assessment of the organic and biomass fractions. The data of the organic and biomass fractions in sewage is essential for the activated sludge model to optimize the biological treatment plant. As a result of this study, the fractions of readily biodegradable substrate($S_S$), slowly biodegradable substrate($X_S$), inert soluble substrate($S_I$), inert particular substrate($X_I$) and heterotrophic biomass($X_{HAB}$) were about 26.6%, 41.5%, 8.5%, 14.7% and 8.7% on the basis of chemical oxygen demand($COD_{Cr}$), respectively. And the fractions of nitrogen were also studied. The fractions of soluble nitrate nitrogen($S_{NO}$), soluble ammonia nitrogen($S_{NH}$), soluble nonbiodegradable organic nitrogen($S_{NI}$), soluble biodegradable organic nitrogen($S_{ND}$) and slowly biodegradable organic nitrogen($X_{ND}$) were about 3.7%, 64.9%, 4.7%, 9.4% and 17.4%, respectively.

Mechanical Properties on Poly Lactic Acid based Graft Copolymer with Polyethylene Glycol Acrylate (Polyethylene Glycol Acrylate를 이식 공중합 기반의 Poly Lactic Acid에 관한 기계적 특성)

  • Kim, Ki-Jun;Sung, Wan-Mo;Kim, Joo-Han;Jung, Hyung-Hak
    • Journal of the Korean Applied Science and Technology
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    • v.34 no.3
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    • pp.643-649
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    • 2017
  • Biodegradable enzymes such as lipase and proteinase can hydrolyze not only fatty acid esters and triglycerides, but also aliphatic polyesters. We measured the biodegradability that biodegradable enzymes have an important role in the degradation of natural aliphatic poly material such as PLA, corn starch, and polyethylene glycol in the natural environment. However, we investigated on the biodegradability of PLA, PLA and Polyethylene acrylate blended, and PLAcoPolyethylene polymerized with PLA graft copolymer Polyethylene glycol acrylate. When prepared biodegradable polymers. the Mechanical properties of them were measured on Biodegradability, thermal properties, real time in-situ electrical monitoring of polymers resin. Therefore BOD and biodegradation of PLAcoPolyethylene was graft copolymerized with PLA and polyethylene acrylate were measured at a lower rate than the other samples.