• 원예과학기술지
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• 제35권3호
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• pp.314-322
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• 2017

The aim of this study was to determine suitable oxygen transmission rate (OTR) films for modified atmosphere (MA) storage of asparagus spears (Asparagus officinalis L.), and to examine the related changes in asparagus spear quality. Asparagus spears were packed with 10,000, 20,000, 40,000, 70,000, and $100,000cc/m^2{\cdot}day{\cdot}atm$ OTR film treatments for MA storage, and perforated film (conventional storage) was used as the control. The fresh weight loss rate was less than 1% in all OTR film treatments but not in the control. In all OTR film treatments, ethylene content rapidly increased on the first day of storage, and gradually decreased thereafter to $2.0{\mu}L{\cdot}L^{-1}$ by the final storage day. In the 10,000 cc and 20,000 cc OTR film treatments, carbon dioxide content was maintained within the permissible range for asparagus spears under recommended controlled atmosphere (CA) and MA conditions (5-12%). The oxygen content was maintained between 12% and 20% in all OTR film treatments. Hue angles and total chlorophyll content were highest in the 10,000 cc OTR film treatment in both tips and stems. Visual quality was maintained at a saleable level only in the 10,000 cc OTR film treatment until the final storage day (25 days). Based on sensory evaluation, the least off-odor was detected in the 10,000 cc OTR film treatment, and the most in the control treatment. While the soluble solids content decreased with all film treatments, it was maintained at the highest level in the 10,000 cc OTR film treatment. Vitamin C content decreased with all film treatments during storage, but was maintained at higher levels in the 10,000, 20,000, and 40,000 cc OTR film treatments. The firmness of tips and stems increased with storage duration in all film treatments, stems were firmer under the perforated film, 10,000, and 20,000 cc OTR film treatments. Given these results, the 10,000 cc OTR film treatment is considered the most appropriate for MA asparagus spear storage since visual quality and soluble solids content were maintained, and fresh weight loss, vitamin C content, off-odor, and yellowing were suppressed during storage.

• 생물환경조절학회지
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• 제27권2호
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• pp.180-184
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• 2018

본 연구는 큰다닥냉이 어린잎 채소의 MA저장 중 OTR 필름 종류가 품질에 미치는 영향을 알아보고자 수행하였다. 플라스틱하우스에서 2주간 재배한 초장 10cm 내외의 큰다닥냉이 어린잎를 산소투과도가 1,300cc, 10,000cc, 20,000cc, 40,000cc, 그리고 $80,000cc{\cdot}m^{-2}{\cdot}day^{-1}{\cdot}atm^{-1}$인 OTR필름과 대조구인 미세천공필름($\varnothing$ 0.06cm, $36ea/100cm^2$)을 사용하여 포장하여 $8^{\circ}C$에서 10일간 저장하였다. 저장 종료일 모든 OTR필름 처리구의 생체중 감소율은 0.5%를 보였고, 대조구인 미세천공 필름은 1.3%의 감소를 나타냈다. 포장 내 산소농도는 20,000cc, 40,000cc, 그리고 80,000cc OTR필름 처리구에서 저장중 18%이상의 농도을 유지하였고, 1,300cc OTR필름 처리구는 저장 종료일 11%의 농도로 가장 낮게 유지되었다. 이산화탄소 농도는 1,300cc와 10,000cc OTR필름 처리구에서 각각 4.5%와 3.4%의 수준으로 꾸준히 증가하였고, 다른 OTR필름 처리구는 1% 미만의 농도를 유지하였다. 포장 내 에틸렌 농도는 저장 기간 중 1,300cc OTR 필름 처리구에서 $3-5{\mu}L{\cdot}L^{-1}$로 가장 높게 유지되었다. 1,300cc OTR필름 처리구에서 가장 낮은 이취와 가장 높은 외관상 품질을 보였는데, 대조구를 포함한 다른 처리구들은 황화현상으로 인한 품질저하로 상품성을 상실하였다. 저장 종료일에 조사한 엽록소 함량과 Hue angle값은 1,300cc OTR필름 처리구에서 가장 높았으며, 황색도를 나타내는 $b^*$값은 1,300cc OTR필름 처리구에서 가장 낮았다. 따라서 MA저장 중 황화와 이취 억제효과가 우수한 1,300cc OTR필름이 큰다닥냉이 어린잎 채소의 포장에 적합하다고 판단된다.

• 한국포장학회지
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• 제23권2호
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• pp.83-87
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• 2017

본 연구는 딸기(cv. 'Maehyang')의 모의 선박 수출 온도조건($2^{\circ}C$(10일${\sim}8^{\circ}C$(11일))에서 MA 저장에 적합한 고 산소투과율(OTR) 필름 종류 구명과 이에 따른 품질 변화를 알아보기 위해 실시하였다. MA 저장 처리는 산소투과율이 각각 1,300, 10,000, 20,000, 그리고 $30,000cc/m^2{\cdot}day{\cdot}atm$ OTR 필름으로 하였고, 관행 유통 처리는 유공 필름으로 포장한 대조구로 두었다. 저장 중 생체중 감소율은 유공 필름을 제외한 모든 MA 저장 처리에서 0.5% 미만이었다. 포장 내 이산화탄소와 산소 농도는 10,000 cc, 20,000 cc, 그리고 30,000 cc OTR 필름에서 딸기의 적정 CA/MA 조건(이산화탄소 15~20%, 산소 농도 5~10%)을 유지하였다. 에틸렌 농도는 처리간 차이를 보이지 않았다. 이취는 1,300 cc OTR 필름은 관능 평가를 통해 높은 이취와 가장 낮은 곰팡이 발생률을 보였다. 경도, 당도, 그리고 외관상 품질은 10,000 cc OTR 필름에서 가장 높게 유지되었다. 결론적으로, 10,000 cc OTR 필름은 가장 높은 품질과 관행 유통 조건보다 저장 수명을 13일 정도 연장할 수 있었다.

• 원예과학기술지
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• 제32권5호
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• pp.655-665
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• 2014

콜라비의 선도유지를 위한 적정 MA 포장재를 구명하기 위해 품질과 비타민 C 함량에 있어서의 MA 포장의 영향을 조사하였다. 콜라비의 저장수명을 연장하기 위한 MA 포장재는 $50{\mu}m$ PE와 OPP에 산소투과율(OTR) 3,000, 10,000, $15,000mL/m^2/day/atm$으로 조성된 필름을 사용하였다. 산소투과율을 조정한 포장재들이 콜라비의 중량 손실과 부패를 지연하고 저장 기간을 연장하는 효과가 있었다. 특히, OTR 3000 포장은 상온저장기간 동안 이상적인 가스 조성인 3.2-6.7kPa $O_2$ + 13.1-19.8kPa $CO_2$을 유지했으며, 이 포장재로 저장된 콜라비가 가장 낮은 중량감소율과 높은 외관지수를 보였다. $50{\mu}m$ PE 포장은 부패와 이취가 저장말기로 갈수록 급속히 발생하였다. 콜라비를 저온저장 할 경우에는 MA 포장간의 외관 품질에서의 유의적 차이는 나타나지 않았다. 콜라비의 비타민 C 함량은 상온 및 저온저장기간 동안 높은 투기율을 가진 OTR 15000 포장이 손실이 가장 컸고, $50{\mu}m$ PE와 OTR 3000 포장이 손실이 낮았다. 본 연구결과, OPP 필름에 OTR 3000으로 조성된 포장재를 사용하는 것이 콜라비의 품질과 비타민 C 함량 유지를 수반한 저장 수명 연장에 가장 효과적인 것으로 밝혀졌다.

• 식품과학과 산업
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• 제50권2호
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• pp.12-26
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• 2017

Processing steps such as washing and cutting, involved in preparing fresh-cut produce causes tissue damage, leading to rapid quality deterioration. Major defects of fresh-cut produce are discoloration, softening, off-odor development, and microbial growth. Packaging of fresh-cut produce has been changed to reduce these quality problems. Flexible packaging film is widely used to pack fresh-cut produce. Vacuum packaging was the popular packaging method in the beginning of fresh-cut industry in Korea. Vacuum packaging creates high $CO_2$ and low $O_2$ levels to control browning of fresh-cut produce. However, these conditions induce some visual defects and off-odor development. Discoloration problem was also found when fresh-cut produce was packaged with conventional packaging film or plastic tray. Modified atmosphere (MA) packaging is effective for prolonging shelf-life of fresh-cut produce by decreasing $O_2$ and increasing $CO_2$ concentration in the package. Retail MA packaging using different oxygen transmission rate (OTR) film and micro-perforated film has started to be applied to fresh-cut produce in Korea. Proper MA package design that provides optimum range of $O_2$ and $CO_2$ partial pressures is one of the major challenges in the industry. An initial package flushing with $N_2$ or an low $O_2$/high $CO_2$ atmosphere is also used to more rapidly establish steady-state MA condition. Film OTR and $O_2$ flushing affects the fermentative volatile production, off-odor development, electrolyte leakage, discoloration, $CO_2$ injury, microbial population of fresh-cut produce. There is also a demand for convenient packaging to attract consumers. Rigid fresh-cut produce container for retail market has increased since the packaging provides excellent protection from physical damage during transport. Rigid tray used as actual serving vessel for the consumer is increasing in Korea. The tray with flexible lid to wrap or seal fresh-cut produce is more and more gaining popularity. Further practical technology to control quality change and microbial growth for each fresh-cut product has been studied since various fresh-cut items were required. The fresh-cut industry also focuses on searching for more convenient and environmentally friendly packaging.

• 열처리공학회지
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• 제31권4호
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• pp.187-193
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• 2018

In this study, the electrical conductivity, transmittance and gas barrier properties of diamond-like carbon (DLC) thin films were studied. DLC is an insulator, and has transmittance and oxygen gas barrier properties varying depending on the thickness of the thin film. Recently, many researchers have been trying to apply DLC properties to specific industrial conditions. The DLC thin films were deposited by PECVD (Plasma Enhanced Chemical Vapor Deposition) process. The doping gas was used for the DLC film to have electrical conductivity, and the optimum conditions of transmittance and gas barrier properties were established by adjusting the gas ratio and DLC thickness. In order to improve the electrical conductivity of the DLC thin film, $N_2$ doping gas was used for $CH_4$ or $C_2H_2$ gas. Then, a heat treatment process was performed for 30 minutes in a box furnace set at $200^{\circ}C$. The lowest sheet resistance value of the DLC film was found to be $18.11k{\Omega}/cm^2$. On the other hand, the maximum transmittance of the DLC film deposited on the PET substrate was 98.8%, and the minimum oxygen transmission rate (OTR) of the DLC film of $C_2H_2$ gas was 0.83.

• 한국세라믹학회지
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• 제41권5호
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• pp.364-369
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• 2004

The barrier and optical properties of AlO$_{x}$ thin films on polycarbonate deposited by Reactive Ion Beam Sputtering (RIBS) were investigated at different oxygen partial pressure. We measured the deposition rate of AlO$_{x}$ thin films. As the oxygen partial pres-sure increased, the deposition rate increased then decreased. The changes of deposition rate are associated with the properties of deposited films. The properties of deposited AlO$_{x}$ thin films were studied using X-ray Photoelectron Spectroscopy (XPS), Scan-ning Electron Microscopy (SEM), and Atomic Force Microscopy (AFM). Optimum deposition parameters were found for fabricat-ing aluminum oxide thin films with high optical transparency for visible light and low Oxygen Transmission Rate (OTR). The optical transmittance of AlO$_{x}$ thin film deposited on polycarbonate (PC) showed the same value of bare PC.bare PC.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.806-809
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• 2009

Epoxy functionalized organic-inorganic hybrid materials (hybrimers) were synthesized by sol-gel reaction for application in OLED barrier coating. By using the calcium degradation method, the oxygen transition rate (OTR) and water vapor transition rate (WVTR) measured so far is $10^{-2}cc/m^2$-day for oxygen and $10^{-1}g/m^2$-day for water molecules with single hybrimer coating film, respectively. Encapsulated OLED devices have life time of 14hrs of a single hybrimer barrier coating and 29hrs of hybrimer/inorganic double barrier coatings at $25^{\circ}C$ and 60% relative humidity.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 춘계학술대회 논문집 디스플레이 광소자분야
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• pp.189-192
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• 2004

To improvement life-time of the organic light emitting diodes(OLEDs). We investigate the inorganic composite film based on MgO and $SiO_2$ to protect from the moisture and oxygen. The inorganic composite films are added the base materials to the co-operate materials using the mixed process and it is deposited on plastic substrate by e-beam evaporator. In order to analyze as kinds of inorganic materials, Water Vapor method of Transmission Rate (WVTR) and Oxygen Transmission Rate (OTR) are measured by Permatran equipment(MOCON Corp.). For comparison. an MgD- and $SiO_2$-based composite film has lower values of WVTR and OTR than inorganic composite/compound films of ones. The results obtained here shows that this film is suitable for passivation layer to extend the life-time of OLEDs.

• Journal of Applied Biological Chemistry
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• 제61권1호
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• pp.25-31
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• 2018

신선편의 양상추의 포장 시 산소투과율이 서로 다른 필름을 적용하여 저온저장 중 품질 변화를 조사하여 신선편의 식품의 제품설계 및 유통 중 품질 관리를 위한 기초 자료로 활용하고자 하였다. 신선편의 양상추는 산소투과율 각각 5,000, 8,000 및 $10,000cc/m^2{\cdot}day{\cdot}atm$인 OPP 필름을 리드로 하여 용기 포장하고 $10^{\circ}C$에서 7일간 저장하면서 품질변화를 조사하였다. 필름의 산소투과율에 따른 통계적 유의차는 나타나지 않았으나, 표면온도를 제외하고 모든 품질 항목이 저장일 경과에 따른 통계적 유의차를 나타내었다(p <0.05). 저장 중 신선편의 양상추의 표면 온도는 평균 $13^{\circ}C$ 내외로, 산소투과율이 높을수록 표면온도는 낮게 유지되고 있었다. 저장 7일경 중량감소율은 2.8~5.4% 수준으로 산소투과율 $5,000cc/m^2{\cdot}day{\cdot}atm$에서 가장 높았다. pH는 저장에 따라 유의적으로 증가하였으며(p <0.05), 산소투과율이 높을수록 pH의 변화는 작았다. 저장에 따라 포장 내부의 산소는 감소하고, 이산화탄소는 증가하고 있었는데, 필름의 산소 투과율이 높을수록 잔존산소 함량이 높고, 이산화탄소 함량이 낮게 나타났다. 저장에 따른 총페놀 함량 및 DPPH 라디칼 소거능은 감소하고 있었는데, 필름의 산소투과율이 높을수록 총페놀 및 항산화성도 높게 유지되고 있었다. 저장 7일경 일반세균은 5.48~6.59 log CFU/g 수준으로, 산소투과율이 높을수록 높게 나타났다. 전반기호도를 기준으로 저장 5일경까지 상업적 품질을 유지하고 있었다.