• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
• /
• v.29 no.3
• /
• pp.145-151
• /
• 2023

In order to extend shelf life for rockfish fillets by modified atmosphere packaging (MAP), different package atmospheres were compared in the product quality preservation. Firstly, CO₂ solubility was measured at 0, 5, 10, and 15℃ to be incorporated into the mathematical model to predict the volume and CO₂ concentration of the package at expected storage temperature. The CO₂ solubility given in Henry's constant decreased with temperature to be fitted with a linear equation. Then air packaging as control and four MAP conditions of 100 g fillets were prepared and stored for duration of 5 days at 10℃ to compare them in the quality preservation effect. Four MAP conditions employed were CO₂(60):O₂(30):N₂(10), CO₂(60):O₂(0):N₂(40), CO₂(30):O₂(30):N₂(40) andCO₂(30):O₂(0):N₂(70). MAP conditions with high CO₂ concentration inhibited total aerobic bacteria, and the conditions containing O₂ led to low TVB-N. MAP of CO₂(60):O₂(30):N₂(10) was found to be the best condition for rockfish fillet preservation considering total aerobic bacteria growth and nitrogenous volatiles production.

• 한국포장학회:학술대회논문집
• /
• 2006.11a
• /
• pp.95-101
• /
• 2006

거창사과원예협동조합에서 구입한 사과 600상자를 5% $CaCl_2$ 용액에 각각 15분간 침지하는 방법으로 전처리 후 24시간 건조시키고 무포장구, $25{\mu}m$ 두께의 기능성 MA 필름으로 포장한 포장구와 무처리 무포장구인 대조구로 나누어 $0^{\circ}C$의 저온저장고로 옮겨 7개월 동안 저장하면서 3주 간격으로 품질을 분석하였다. 저장 기간이 증가할수록 중량 감소율은 Control 구보다 $CaCl_2$구와 $CaCl_2+MA$구의 중량 감소율이 월등히 낮았다. 경도변화는 저장 기간이 증가할수록 감소하는 경향을 보였으며, 그 중 $CaCl_2$구는 초기치 0.97 $kg_f$에서 저장 18주에는 0.95 $kg_f$로 초기치에 비해 2%의 가장 적은 변화를 보였다. 산도는 대조구보다 처리구의 산도가 높게 나타났으나 큰 차이는 나타나지 않았다. 가용성 고형분 함량은 저장 기간 모든 실험구에 따른 큰 차이가 없었다. 비타민 C 함량은 저장기간이 지날수록 모든 실험구에서 감소하는 경향을 보였으며, 기호도 조사에서 $CaCl_2$구와 $CaCl_2+MA$구가 대조구보다 유의적으로 높게 나타났다.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
• /
• v.7 no.2
• /
• pp.1-5
• /
• 2001

This study was measured weight loss, total ascorbic acid, titratable acidity, and soluble solids content and overall appearances to investigate the effect of FC(corrugated fiberboard box laminated with functional MA film)box, LDPE film, CE(functional MA film)pouches and double wall corrugated fiberboard box during storage at $20^{\circ}C$. Weight loss of tomato packed with control, LDPE, CE and FC box at $25^{\circ}C$ after 7 days were 5.3%, 1.5%, 1.3%, and 1.5%, respectively. Weight loss of control was 3.8% higher than that of FC box. Total ascorbic acid content(TAA) of tomato after 7. days, control was 6.89 mg%, LDPE was 8.62 and CE was 8.53mg%, FC was 8.42mg%. TAA of LDPE, CE and FC was higher than that of control. Titratable acidity of tomato packed with LDPE, FC and CE was higher than that of control. Overall appearances of tomato packed with LDPE, CE and FC was better than that of control. Functional MA film laminated in corrugated paperboard box(FC) showed to be able to used as a packaging box of tomato.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.29 no.2
• /
• pp.248-251
• /
• 2000

To investigate the effects of packaging films (functional MA films/FC30, FC50, MA film/0.03 mm LDPE, corrugated paperboard box/control) weight loss, firmness, total ascorbic acid, chlorophill and overall appearence were evaluated. Weight loss of cucumbers packed with FC30 and FC50 at 2$0^{\circ}C$ after 7 days were 1.0 and 0.6%, that of the control was 2.9%, those of LDPE was 0.5%. The firmness of FC30 and FC50 at 2 $0^{\circ}C$ after 7 days were 1.0 and 0.6%, that of the control was 2.9%, those of LDPE was 0.5%. The firmness of FC30-, FC50 and LD was higher than that of the control. Total ascorbic acid contents (TAA) of cucumbers packed with control, LD, FC30 and FC50 box were 9.96, 10.86, 11.37 and 11.29 mg% after 7 days. TAA of FC box was 10% higher than that of the control. Chlorophill content of FC boxes wase 16% higher than of the control. Overall appearence of cucumber packed with FC boxes was better than that of the control.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
• /
• v.17 no.2
• /
• pp.39-42
• /
• 2011

The aim of this study was to develop the appropriate packaging method for minimally processed sliced onions. The films of different gas permeabilities (LDPE $30{\mu}m$, PD900 and PD941) were used for packaging 1300g of onion slices cut into octuplicate pieces. Perforated LDPE package was prepared as control for comparison. The package atmosphere and onion quality were measured through storage at $1^{\circ}C$ for 38 days. PD900 package of the lowest gas permeability was the best in keeping the fresh-cut onions by maintaining MA conditions of 1-3% $O_2$ and 4-11% $CO_2$ concentrations. The benefits were reduced discoloration, decay and soakness.

• Journal of the Microelectronics and Packaging Society
• /
• v.10 no.4
• /
• pp.21-27
• /
• 2003

The copolymers with various composition of methyl methacrylate (MMA), ethyl methacrylate (EMA), methacrylic acid (MA) and hydroxyethyl methacrylate (HEMA) were synthesized for capacitive humidity sensitive materials. The capacitive humidity sensor consisted of a polymethacrylate film coated on both sides with gold electrode. Capacitance versus relative humidity increased with HEMA content in the copolymer. In the case of self-crosslinkable MMA/MA/HEHA= 40/10/10, the average capacitance at 30%RH, 60%RH and 90%RH are 102, 134 and 166 pF, respectively. And also, the hysteresis, temperature cycle and long-term stability were evaluated as a capacitance humidity sensor.

• Food Science and Preservation
• /
• v.14 no.1
• /
• pp.105-108
• /
• 2007

This study tested customer preferences for "Fuji" apples stored using functional modified atmosphere film (30m) for 16 weeks at $0^{\circ}C$. Customers were 20-60 years of age and lived in either Seoul or Geochang. The freshness, texture, chewiness, and purchase attractiveness of apples in film packaging were judged to be significantly higher than control apples by those aged 20-29 years. The freshness, sourness, flavor, and purchase attractiveness of apples in film packaging were judged to be significantly higher than control apples by those aged 30-39 years. The flavor and sweetness of apples in film packag ing were judged to be significantly higher than control apples by those aged either 40-49 or 50-59 years (${\alpha}=0.05$). In the overall preference tests, apple freshness (P=0.0011), apple flavor (P=0.0002), and apple purchase attractiveness (P=0.0018) of apples in film packaging were judged to be significantly better than control apples by all age groups (those aged 20-59 years).

• Asian-Australasian Journal of Animal Sciences
• /
• v.29 no.12
• /
• pp.1782-1789
• /
• 2016

This study evaluated the effect of vacuum and modified atmosphere (40% $CO_2+60%$ $N_2$, MA) packaging on the chemical composition, physicochemical properties and sensory attributes of chill-stored meat from 10 fallow deer (Dama dama) bucks at 17 to 18 months of age. The animals were hunter-harvested in the forests of north-eastern Poland. During carcass dressing (48 to 54 h post mortem), both musculus longissimus muscles were cut out. Each muscle was divided into seven sections which were allocated to three groups: 0, A, and B. Samples 0 were immediately subjected to laboratory analyses. Samples A were vacuum-packaged, and samples B were packaged in MA. Packaged samples were stored for 7, 14, and 21 days at $2^{\circ}C$. The results of the present study showed that the evaluated packaging systems had no significant effect on the quality of fallow deer meat during chilled storage. However, vacuum-packaged meat samples were characterised by greater drip loss. Vacuum and MA packaging contributed to preserving the desired physicochemical properties and sensory attributes of meat during 21 days of storage. Regardless of the packaging method used, undesirable changes in the colour, water-holding capacity and juiciness of meat, accompanied by tenderness improvement, were observed during chilled storage.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
• /
• v.19 no.2
• /
• pp.61-65
• /
• 2013

Modified atmosphere (MA) of reduced $O_2$ and elevated $CO_2$ concentrations has been used for keeping the quality of fresh produce and extending the shelf life. As a way to attain the beneficial MA package around the produce, a gas diffusion tube or perforation can be attached onto the container and controlled on real time in its opening/closing responding to $O_2$ and $CO_2$ concentrations measured by gas sensors. The timely-controlled opening of the gas diffusion tube can work in harmony with the produce respiration and help to create the desired MA. By use of the mathematical modeling, the effect of tube dimension on the controlled container atmosphere was figured out in this study. Spinach and king oyster mushroom were used as typical commodities for designing the model container system (0.35 and 0.9 kg in 13 L, respectively) because of their respiration characteristics and the optimal MA condition ($O_2$ 7~10%/$CO_2$ 5~10% for spinach; $O_2$ 2~5%/$CO_2$ 10~15% for mushroom). With a control logic for the gas composition to stay as close as possible to optimum MA window without invading injurious low $O_2$ and/or high $CO_2$ concentrations, the atmosphere of the sensor-controlled container could stay at its lower $O_2$ boundary or upper $CO_2$ limit under certain tube dimensional conditions. There were found to be the ranges of the tube diameter and length allowing the beneficial MA. The desired range of the tube dimension for spinach consisted of combinations of larger diameter and shorter length in the window of 0.3~2 cm diameter and 0.2~10 cm length. Similarly, that for king oyster mushroom was combinations of larger diameter and shorter length in the window of 0.9~2 cm diameter and 0.2~3 cm in length. Clear picture on generally affordable tube dimension range may be formulated by further study on a wide variety of commodity and pack conditions.

• Food Science and Preservation
• /
• v.5 no.4
• /
• pp.331-334
• /
• 1998

Weight loss of table Grape packed with control(Corrugated paperboard box), LDPE, CE(MA film masterbatched by ceramic powder treated cemical reagent) and FC box(laminated by CE film pouch) at 25 C after 10 days were 5.6%, 0.4%, 0.6%, and 0.7%, respectively. Weight loss of control was 7.29times higher than that of FC box. Total ascorbic acid content(TAA) of table grape after 10 days was 3.42 mg% for control, was 5.33 for LDPE and 5.14mg% for CE, 4.98mg% for FC. TAA of LDPE and CE showed to higher than that of control, especially TAA of FC was 33% higher than that of control. Titratable acid of LDPE and CE was high compare to control, and acidity of FC was 6% higher than that of control. References in overall appearance of LDPE, CE and FC were better than that of control. Corrugated paperboard box(FC) laminated with functional MA film showed to be able to used as packaging box of table grape.