• 수산해양기술연구
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• 제47권1호
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• pp.10-17
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• 2011

Biodegradable octopus pot was developed to reduce plastic pollution problem in the sea and fishing trouble between fishermen. It can be expect to recycle other wasted biodegrade fishing gear. Experimental fishing was carried out to understand the difference in fishing efficiency between Polyethylene (PE) octopus pots and biodegradable (Polybutylene Succinate and Polybutylene adipate-co-terephthalate) octopus pots which was tried to make in this study in the sea. There were caught by 237 numbers of fishing during the experimental period. Among the 237 numbers of fishing, 160 or 67.5% were PE pots which were more than the biodegradable pots. A comparison of the monthly catches between the PE pots and biodegradable pots shows that the catches were overall higher in the PE pots than in the other pots. The result is very similar with the comparison of total catches by each type of the pots. In terms of bycatch, the number of species, amount of catches and the number of fishing with bycatch were more significant in the biodegradable pots than in the PE pots.

• Food Science and Biotechnology
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• 제16권5호
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• pp.691-709
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• 2007

Concerns on environmental waste problems caused by non-biodegradable petrochemical-based plastic packaging materials as well as consumer's demand for high quality food products has caused an increasing interest in developing biodegradable packaging materials using annually renewable natural biopolymers such as polysaccharides and proteins. However, inherent shortcomings of natural polymer-based packaging materials such as low mechanical properties and low water resistance are causing a major limitation for their industrial use. By the way, recent advent of nanocomposite technology rekindled interests on the use of natural biopolymers in the food packaging application. Polymer nanocomposites, especially natural biopolymer-layered silicate nanocomposites, exhibit markedly improved packaging properties due to their nanometer size dispersion. These improvements include increased mechanical strength, decreased gas permeability, and increased water resistance. Additionally, biologically active ingredients can be added to impart the desired functional properties to the resulting packaging materials. Consequently, natural biopolymer-based nanocomposite packaging materials with bio-functional properties have huge potential for application in the active food packaging industry. In this review, recent advances in the preparation and characterization of natural biopolymer-based nanocomposite films, and their potential use in food packaging applications are addressed.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XIII)
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• pp.451-451
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• 2003

• 대한약학회:학술대회논문집
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• 대한약학회 2000년도 춘계총회 및 학술대회
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• pp.216.2-216.2
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• 2000

• Mycobiology
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• 제49권3호
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• pp.285-293
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• 2021

Polylactic acid (PLA) and polycaprolactone (PCL) are commercially available bioplastics that are exploited worldwide, and both are biodegradable. The PLA and PCL polymer-degrading activity of 30 fungal strains that were isolated from terrestrial environments were screened based on the formation of a clear zone around fungal colonies on agar plates containing emulsified PLA or PCL. Among them, five strains yielded positive results of biodegradation. Strains Korean Agricultural Culture Collection (KACC) 83034BP and KNUF-20-PPH03 exhibited PCL degradation; two other strains, KACC 83035BP and KNUF-20-PDG05, degraded PLA; and the fifth strain, KACC 83036BP, biodegraded both tested plastics. Based on phylogenetic analyses using various combinations of the sequences of internal transcribed spacer (ITS) regions, RPB2, LSU, CAL, and b-TUB genes, the above-mentioned strains were identified as Apiotrichum porosum, Penicillium samsonianum, Talaromyces pinophilus, Purpureocillium lilacinum, and Fusicolla acetilerea, respectively. Based on our knowledge, this is the first report on (i) plastic biodegraders among Apiotrichum and Fusicolla species, (ii) the capability of T. pinophilus to degrade biodegradable plastics, (iii) the biodegradative activity of P. samsonianum against PCL, and (iv) the accurate identification of P. lilacinum as a PLA biodegrader. Further studies should be conducted to determine how the fungal species can be utilized in Korea.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제42권
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• pp.34.1-34.7
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• 2020

Purpose: The purpose of this study was to evaluate the influence of biodegradable polycaprolactone membrane on new bone formation and the biodegradation of biphasic alloplastic bone substitutes using animal models. Materials and methods: In this study, bony defect was formed at the canine mandible of 8 mm in diameter, and the defects were filled with Osteon II. The experimental groups were covered with Osteoguide as barrier membrane, and the control groups were closed without membrane coverage. The proportion of new bone and residual bone graft material was measured histologically and histomorphometrically at postoperative 4 and 8 weeks. Results: At 4 weeks, the new bone proportion was similar between the groups. The proportion of remaining graft volume was 27.58 ± 6.26 and 20.01 ± 4.68% on control and experimental groups, respectively (P < 0.05). There was no significant difference between the two groups in new bone formation and the amount of residual bone graft material at 8 weeks. Conclusion: The biopolymer membrane contributes to early biodegradation of biphasic bone substitutes in the jaw defect but it does not affect the bone formation capacity of the bone graft.

• 문화기술의 융합
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• 제5권1호
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• pp.341-346
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• 2019

연구는 생분해성 PLA 시트의 확대적용에 있어, 중단기적인 도입 성과를 낼 수 있는 혼합비율 및 제조방법을 위하여 혼합비율을 연구하고 적용하는데 제공하고자 한다. 방담기능의 목적으로 사용되는 생분해성 PLA 시트로 방담 기능성을 가지면서 고 내열성, 내 충격성 및 투명성이 향상된 복합 기능성 다층 구조시트로서 복합기능성 다층 구조 시트를 제조하기 위해서 3 Layer 공정을 도입하였다. 내층, Core층, 외층을 구분하여 혼합 압출하였으며, 내층과 Core층은 내 충격성, 고 내열성을 가지며, 외층은 방담기능성을 부여하는 생분해성 PLA 다층 시트구조로 연구한다. 본 연구 결과를 적용함으로써, 일반 PLA 물성 및 내열온도를 향상시켜 플라스틱 대체 및 확대 적용이 가능하다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제32권3호
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• pp.207-217
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• 2010

The purpose of this study was to evaluate the effects of the stress distribution and displacement in mandible according to treatment modalities of mandibular angle fractures, using a three dimensional finite element analysis. A mechanical model of an edentulous mandible was generated from 3D scan. A 100-N axial load and four masticatory muscular supporting system were applied to this model. According to the number, location and materials of titanium and biodegradable polymer plates, the experimental groups were divided into five types. Type I had a single titanium plate in the superior border of mandibular angle, type II had two titanium plates in the superior tension border and in the inferior compression border of mandibular angle, type III had a single titanium plate in the ventral area of mandibular angle, type IV had a single biodegradable polymer plate in the superior border of mandibular angle, type V had a single biodegradable polymer plate in the ventral area of mandibular angle. The results obtained from this study were follows: 1. Stress was concentrated on the condylar neck of the fractured side except Type III. 2. The values of von-Mises stress of the screws were the highest in the just-posterior screw of the fracture line, and in the just-anterior screw of Type III. 3. The displacement of mandible in Type III was 0.04 mm, and in Type I, II, IV, and V were 0.10 mm. 4. The plates were the most stable in the ventral area of mandibular angle (Type III, V). In conclusion, the ventral area of mandibular angle is the most stable location in the fixation of mandibular angle fractures, and the just- posterior and/or the just-anterior screws of the fracture line must be longer than the other, and surgeons have to fix accurately these screws, and the biodegradable polymer plate also was suitable for the treatment of mandible angle fracture.

• 한국포장학회지
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• 제22권3호
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• pp.127-134
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• 2016

얇은 박막 형태로 제작된 기존의 바이오필름은 일반 필름과 비교하여 인장강도, 신장율 등의 물성이 감소되는 단점이 있어 실질적인 활용이 어려웠다. 본 연구에서는 바이오필름 초기 신장율 및 인장강도를 비롯한 물리적 성질 개선과 생분해 촉매제를 사용하여 생분해 기간을 단축시킬 수 있고 일반 고분자와 상용성이 뛰어나며 열, 빛, 수분, 효소 등에 의한 복합분해가 이루어지는 바이오필름을 개발하였다. 국가식품클러스터에서 ASTM D 882방법에 따라 생분해 촉매제 종류별로 선별된 생분해 촉매제 3종(알루미늄 이온염, 철 이온염, 니켈 이온염)이 각각 포함된 생분해 마스터배치(M/B)를 이용하여 HDPE와 LLDPE를 혼합해 바이오필름1-3을 제작하였다. 바이오필름1-3의 물성을 비교 평가하기 위하여 샘플링된 바이오필름과 대조구를 UV 노출법과 열처리하였다. 바이오필름과 대조구의 초기 물성은 유사한 수치를 나타냈다. 바이오필름1-3의 UV 노출 및 열처리 시험결과에 따라 판단하면 Al salt와 Fe salt가 포함된 바이오필름1,2의 인장강도 및 신장율의 감소율이 높은 것으로 확인되었다. 하지만 재료 원가와 산업적인 이용 가능성을 고려하였을 때 Fe salt가 포함된 바이오필름2를 선택하였으며 Fe salt 함량별 실험을 진행하였다. 추가적으로 농도별 효과를 알아보기 위하여 철 이온염의 농도를 0.5%, 1.0%, 1.5%, 2.0%의 함량으로 제조한 바이오필름 4-7과 대조구를 비교 평가하였다. 앞의 시험과 동일한 조건의 UV 처리를 하였으며 그 결과 0.5%에서 2.0%으로 철 이온염의 함량이 높아질수록 인장강도와 신장율이 모두 줄어들어 감소율이 높아졌다. 추가적인 바이오필름의 생분해도 측정 시험을 통해 생분해성 평가의 기준물질인 셀룰로오스에 대비하여 평균 생분해도는 39.2% 확인하고 UV처리를 통한 분자량 테스트 결과 대중적으로 사용되는 필름에 비해 분자량 감소가 훨씬 우수한 것으로 나타났다. 바이오필름4-7 모두 활용할 수 있지만 가격경쟁력과 생산성을 고려할 때 바이오필름5가 가장 우수한 것으로 판단되었다. 앞으로 Fe salt가 포함된 바이오필름은 기존의 필름 대비 우수한 물성을 가지고 생분해 촉매제를 통한 분해기간 단축과 같은 여러 특징을 포함하여 국내 포장 산업의 다양한 분야에 활용될 수 있을 것이다.

• 한국세라믹학회지
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• 제51권2호
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• pp.127-131
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• 2014

Precipitated calcium carbonate(PCC) inorganic fillers for plastic offera higher replacement ratio with improved mechanical properties than any other inorganic fillers. Due to its secure economic feasibility, its fields of application areexpanding. For optimized PCC grain size and polymer replacement ratio, it is good to maintain at least $0.035{\mu}m$ grains and keep double the grain size of distance between particles, depending on the molecular weight and volume replacement rate of the polymer. PCC has unique characteristics, ie, with smaller grain size, dispersibility decreases, and if grain size is not homogenous, polymer cracking occurs. The maximum replacement ratio of PCC is approximately 30%, but in the range of 10 - 15% it produces the highest mechanical strength. When mixed with a biodegradable plastic like starch, it also improves initial environmental degradability.