• 한국축산식품학회지
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• 제36권3호
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• pp.421-426
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• 2016

Polylactic acid (PLA) is a biodegradable and renewable polymer, which represents a valuable alternative to plastic packaging films, often associated with environmental problems. In this study, we tested the suitability of PLA as a biodegradable packaging film and assessed the antimicrobial activity of lemongrass oil (LO), incorporated into the PLA film in different concentrations. To obtain the optimal physical properties for PLA films, tensile strength, elongation at break, and water vapor permeability were measured under different preparation conditions. In addition, the antimicrobial activity of the LO contained in the PLA film against Listeria monocytogenes was investigated by disc diffusion and viable cell count. Among all concentrations tested, 2% LO was the most suitable in terms of antimicrobial activity and physical properties of the PLA film. Based on these results, we used the PLA film containing 2% LO to pack pork sausages; after 12 d of storage at 4℃, the population of inoculated L. monocytogenes in the sausage samples wrapped with the PLA film containing 2% LO was reduced by 1.47 Log CFU/g compared with the control samples. Our data indicate that PLA films containing 2% LO represent a valuable means for antimicrobial sausage packaging.

• 월간포장계
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• 통권220호
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• pp.94-98
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• 2011

• 한국식품저장유통학회지
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• 제5권2호
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• pp.138-143
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• 1998

The stowage effects of Satsuma mandarin(Citrus unshiu Marc. var. miyagawa) were investigated by selecting various pretreatmnents; non-tested, wax-coating, paper packaging, 0.02mm cryovac film packaging. Weight loss of film packaging was the lowest among that of others, but decay radio was increased highly at late stages of storage. Soluble solids, moisture content of peel and total sugar were maintained almost constant, but acid content, vitamin C and firmness were reduced gradually during storage at room temperature. For 100 days storage, losses from weight and decay of ton-treated, paper packaging, wax-coating and film packaging were 15.9%, 18.5%, 17.4% and 12.9%, respectively. Acid content was decreased loom 1.28% to 0.81∼0.91% after 100 days storage. Ethylene evolution was increased in a degree after 65 days storage, and the amount was increased repidly afer 115 days. it seemed to be derived from decayed fruits and physiological activities. CO2 content of inner part of fruits was increased between 40∼100 days after storage. Optimum storage period of early variety of Satuma mandarin was regarded for 100days on the basis of appeareance and taste.

• 한국식품저장유통학회지
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• 제14권5호
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• pp.457-461
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• 2007

영주산 '후지' 사과의 전처리 및 포장방법별 저장기간 동안 품질변호를 알아보기 위하여 사과를 5% $CaCl_2$ 용액에 15분 동안 침지한 후 완전히 건조시켜 $25\;{\mu}m$ 두께의 LDPE 필름으로 박스단위로 포장하여 $0^{\circ}C$의 농협 현지저온저장고에서 21주간 중량감소율, 경도, 적정산도, 가용성 고형분함량, 비타민 C함량, 부패율 조사하였다. 중량감모율, 경도변화, Vitamin C 변화, 부패율 등에서 칼슘처리과 필름포장을 병행한 처리구(Ca-MA)가 다른 처리구에 비해 저장 중 품질변화가 가정 적은 것으로 나타나 영주산 '후지' 사과 저장시 선도유지에 효과적인 것으로 사료된다.

• 한국식품저장유통학회지
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• 제14권1호
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• pp.105-108
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• 2007

거창과 서울에 거주하는 소비자로 20대부터 60대까지 남녀 280명을 대상으로 MA 필름으로 포장한 포장구 사과와 포장하지 않은 대조구 사과의 신선함, 단맛, 신맛, 향미, 아삭거림, 씹힘성, 구매의사에 대한 기호도를 조사한 결과 20대에서 신선함, 아삭거림, 씹힘성과 구매의사에서 대조구보다 포장구의 기호도가 유의적으로 높게 나타났다. 30대는 신선함, 신맛, 향미, 구매의사에서 40대는 향에서, 50대에서는 단맛과 향에서만 대조구보다 포장구의 기호도가 유의적으로 높게 나타났다. 그리고 60대에서 신선함, 향미, 구매의사에서는 대조구보다 포장구의 기호도가 유의적으로 높게 나타난 반면, 단맛, 신맛, 아삭거림에서는 포장구보다 대조구의 기호도가 유의적으로 높은 것으로 나타났다. 모든 연령에서의 대조구와 포장구 사과의 기호도는 맛의 특성 중 신선함(p=0.0011), 향미(p=0.0002), 구매의사(p=0.0018)에서 유의적으로 포장구가 높게 나타났고, 단맛, 신맛, 아삭거림, 씹힘성에서는 기호도 차이가 나타나지 않았다.

• 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.

• 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.

• 한국식품저장유통학회:학술대회논문집
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• 한국식품저장유통학회 1999년도 임시총회 및 제14차 학술발표회 진행표 및 발표논문 초록집
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• pp.11-22
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• 1999

The functional packaging film, that keeps the freshness of the fresh produce, has composed of the ferro fluid particles, chitin and chitosan. The film exhibited selectivity in permeability for carbon dioxide and ethylene gases. Antagonistic effect of the film for Fusarium, Botrysphania, Altanaria and E. coli was excellent. The film kept the favorable taste of Kimchi and Korean strawberry well.

• 한국식품저장유통학회지
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• 제6권1호
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• pp.43-47
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• 1999

To develop a wrapping film, which suppresses the microbial decay through the storage and distribute of greenhouse fresh produce, the antimicrobial packaging films were made and applied to the preservation of grapes(Campbell early). For the purpose the films were made by adding 1% grapefruit seed extract(GFSE) to LDPE film(Control). Graps were separately wrapped with packaging films in the state of closely-adhered packaging as well as modified atmosphere packaging(MAP). The wrapped grapes were stored at 5$^{\circ}C$ for 65 days and then the colony count of contaminated microorganims, decay ration of grapes, the gas component within the packages and chemical qualities were investigated. The antimicrobial film packaging showed the efficient results to suppress microbial growth as compared with control. The total number of containated microorganisms were decreased gradually through all the storage period. In the closely-adhered packaging and MAP the decay ratios of grapes was 31% and 19%, indivisually. After the storage period of 65 days, the interior gas components of MAP were 4.5% of O2 and 17.6% of CO2, which were efficient for the storage of grapes. In addition, no negative effects in sweetness and acidities occurred.

• 한국식품과학회지
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• 제31권5호
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• pp.1289-1294
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• 1999

마른 오징어를 실험실에서 직접 제조한 후 3종(투명, 흰색, 검정색)의 포장재에 포장하여 직사광선이 조사되는 상온조건(6월${\sim}$7월)에서 50일간 저장중 마른 오징어의 품질변화를 측정하였다. 저장 기간중 수분 함량 및 수분활성도의 변화는 극히 미미한 것으로 측정되었으며 총균수의 변화도 거의 변화가 없는 것으로 측정되어 수분 함량 및 미생물에 의한 마른 오징어의 품질변화가 거의 없는 것으로 생각되었다. 직시 색차계를 이용하여 저장중 마른 오징어의 색택 변화를 측정하였을 때 흰색, 검정색의 유색 포장재로 포장한 처리구의 경우 L값이 투명 포장재에 비하여 높게 측정되었으며 ${\Delta}E$값의 경우도 유사한 경향을 나타내었다. ${\Delta}E$ 값의 경우 저장 초기에 급속하게 증가하였으며 그 이후로는 완만하게 증가하는 경향이었다. TBA value를 측정하였을 경우 저장 초기에 급속하게 증가하였으며 그 이후로는 완만하게 감소하는 경향을 나타내어 마른 오징어의 갈색화는 저장 초기의 지질산화에 의해 진행되는 것으로 판단되었다. 또한 3종의 포장재에 대한 자외선 투과 실험 결과 흰색, 검정색의 포장재가 자외선 차단 효과가 있는 것으로 나타나 마른 오징어의 포장시 투명 포장재 보다는 유색포장재를 사용하는 것이 지질산화에 의한 갈변현상을 어느정도 억제할 수 있는 방법이라고 생각되었다.