• Title/Summary/Keyword: MA storage

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Storage Quality of Sulhyang Strawberries as Affected by High O2 Atmosphere Packaging (고산소 환경기체조절 포장조건에 따른 설향 딸기의 저장 중 품질변화)

  • Lee, Hyun-Hee;Hong, Seok-In;Kim, Dongman
    • Korean Journal of Food Science and Technology
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    • v.45 no.2
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    • pp.191-198
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    • 2013
  • The storage quality of fresh Sulhyang strawberries packaged under modified atmospheres was investigated to examine the effect of high $O_2$ on the fruit. Fresh strawberries were packed into PP trays and top-sealed with PET/PP film. Initial gas compositions inside the packages were varied with air, 40% $O_2$/60% $N_2$, 60% $O_2$/40% $N_2$, and 80% $O_2$/20% $N_2$. Sealed packages in PE film bags with air and perforated PP trays were also used as another treatment and control, respectively. Quality attributes and viable cell counts of pathogenic bacteria were assessed during storage at $5^{\circ}C$ for 12 days. High $O_2$ concentration showed no significant effects on the physicochemical and microbial qualities of strawberries. Fruit packaged in PE film bags with 6-15% $O_2$ and 7-9% $CO_2$ during storage had the lowest viable cell counts of inherent microorganisms among the treatment samples. Growth of pathogenic bacteria was suppressed in perforated packages where molds occurred frequently. In an overall sensory aspect, the PE film packages exhibited higher scores than the others at the end of storage period. The experimental results suggested that gas-permeable film packaging with an appropriate combination of $O_2$ and $CO_2$ rather than gas-barrier tray packaging with an initially high $O_2$ concentration would be suitable for improving the storability of strawberries.

Effects of Chlorine Dioxide Treatment on Quality and Microbial Change of Agaricus bisporus Sing during Storage (이산화염소 처리가 저장 중 양송이버섯(Agaricus bisporus Sing)의 품질 및 미생물학적 변화에 미치는 영향)

  • Ku, Kyoung-Ju;Ma, Yu-Hyun;Shin, Hee-Young;Lee, Seung-Hwan;Park, Jae-Hyun;Kim, Lan-Hee;Song, Kyung-Bin
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.35 no.7
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    • pp.955-959
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    • 2006
  • Effects of chlorine dioxide ($ClO_2$) on weight loss, polyphenol oxidase activity, and microbial change of fresh mushrooms (Agricus bisporus Sing) were investigated. Mushrooms were treated with 5, 10, and 50 ppm of $ClO_2$ solution. Mushrooms were stored at room temperature and $4^{\circ}C$. Weight loss for $ClO_2$ treated mushrooms was smaller than that of the control group. Polyphenol oxidase activity of the $ClO_2-treated$ samples stored at room temperature increased until day 2 of storage and then decreased, and the activity of the samples stored bacteria, yeast and mold counts than the control during storage. Aerobic bacterial counts for 50 ppm of $ClO_2$ treatment at $4^{\circ}C$ increased from $1.62{\times}10^2\;CFU/g\;to\;1.66{\times}10^7\;CFU/g$ at day 10 of storage, while control groups were from $1.00{\times}10^3\;CFU/g\;to\;3.72{\times}10^8\;CFU/g$. These results indicate that $ClO_2$ treatment could be useful in improving the quality and microbial safety of mushrooms.

A Study on the Preparation of UPE Resins with Different Glycol Molar Ratios and Their Physical Properties : 3. Estimation of Viscoelastic and Critical Surface Tension of UPE Liquid Resins (글리콜 몰비가 다른 불포화 폴리에스테르 수지의 제조 및 물성에 관한 연구 : 3. UPE 액상 수지의 임계표면장력 및 점탄성 평가)

  • 이상효;안승국;이장우
    • Polymer(Korea)
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    • v.24 no.5
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    • pp.589-598
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    • 2000
  • In this study, various unsaturated polyester (UPE) resins were prepared from the condensation polymerization of mixtures of saturated (isophthalic acid : IPA) and unsaturated (maleic anhydride : MA) dibasic acids with propylene glycol (PG), neopentyl glycol (NPG). The critical surface tension (Υ$_{c}$) for the surface characteristics of a solid were estimated by Zisman plot, and the structure-property relationship was investigated by measuring the rheology of resins. The values of Υ$_{c}$ for glass of solid were 30.5 mNㆍm$^{-1}$ for UPE resin liquids. As the content of NPG in a PG/NPG glycol mixture increased, both the contact angle and the surface tension of the UPE resin liquids were found to decrease. The dynamic viscoelasticities of UPE resins with different glycol molar ratios were also measured. Shear rate dependence of viscosity and angular frequency dependence of storage, and loss modulus tended to decrease with increasing NPG content.

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Effects on Quality of Strawberry Fruit by Dipping of Calcium Solution and MA Packaging (칼슘처리와 MA포장이 딸기의 품질에 미치는 영향)

  • Guan Junfeng;Park Hyung-Woo;Kim Yoon-Ho;Kim Sang-Hee;Park Hye-Ran
    • Food Science and Preservation
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    • v.13 no.1
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    • pp.13-17
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    • 2006
  • The strawberry was dipped into $1\%\;CaCl_2$ solution at $20^{\circ}C\;and\;45^{\circ}C$ for 15min. respectively, and then packaged with or without PE film (thickness: 0.011mm) before putting into the cold storage at $5^{\circ}C$. The results showed the lowest rate of rot incidence and the highest firmness with higher Vitamin C content and the best superficial appearance in the treatment of $CaCl_2$ dipping at $45^{\circ}C$ with packaging. It also showed lower pH and higher titratable acidity in the treatment However, no significant difference of SSC was found among various treatments. The results suggested that the combination of postharvest calcium dipping and packaging could result in more effective preservation for strawberry compared with the individual treatment.

Effects of α-, γ-, and δ-tocopherol on the oxidative stability of horse fat (마유(Horse Fat)의 산화안정성에 대한 α-, γ-, δ-토코페롤의 첨가 효과)

  • Park, Youn Hyung;Cho, Man Jae;Kim, Hyun Jung
    • Korean Journal of Food Science and Technology
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    • v.50 no.3
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    • pp.267-273
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    • 2018
  • Horse fat was extracted from fatty horse meat at $70^{\circ}C$ under vacuum conditions. The oxidative stability of horse fat was investigated by the addition of 0, 30, 60, and 150 mg/kg of ${\alpha}$-, ${\gamma}$-, or ${\delta}$-tocopherol during storage of 14 days at $65^{\circ}C$ in the dark. Changes of tocopherol concentration and fatty acid composition, peroxide value, and 2-thiobarbituric acid (TBA) value were analyzed during storage. The levels of the added tocopherols were found to decrease during storage. Unsaturated fatty acids contents of horse fat without tocopherol decreased from 60.87% to 57.22% after 14 days. The peroxide value and TBA value increased as storage time increased. The peroxide values of horse fat after addition of 0, 30, 60, and 150 mg/kg of ${\gamma}$-tocopherol were 43.75, 25.17, 20.87, and 15.41 meq/kg, respectively, and the TBA values were 7.87, 5.64, 4.43, and 4.23 mg malonaldehyde (MA)/kg, respectively, after 14 days. At the concentration of 150 mg/kg, both ${\gamma}$- and ${\delta}$-tocopherol impeded the oxidation of horse fat during storage.

Effects of modified atmosphere packaging (MAP) and vaporized ethyl pyruvate (EP) treatment for the shelf life of 'Seolhyang' strawberries (딸기 '설향' 품종의 MAP 및 ethyl pyruvate 처리의 유통기한 연장 효과 연구)

  • Kim, Jinse;Park, Jong Woo;Park, Seok Ho;Choi, Dong Soo;Kim, Yong Hoon;Lee, Soo Jang;Park, Chun Wan;Lee, Jung Soo;Cho, Byoung-Kwan
    • Food Science and Preservation
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    • v.24 no.3
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    • pp.351-360
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    • 2017
  • We have studied the technology to extend the storage period of 'Seolhyang' strawberries using modified atmosphere package (MAP) and ethyl pyruvate (EP) treatment for domestic distribution and export. The selected ripe strawberries harvested on December 28, 2016 at the Sancheong farmhouse were transported to the laboratory for 2 h and tested. After a day's precooling at $4^{\circ}C$, the strawberries were divided into seven experimental groups. These groups were control, active MAP using low density polyethylene (LDPE), active MAP using polyamide (PA), active MAP using PA with EP treatment, passive MAP using LDPE, passive MAP using PA and passive MAP using PA with EP treatment. Quality analysis was carried out every 4 days during the storage period of 16 days. During the storage period of 16 days, MAP decreased from 3.5% to less than 1.1% in weight loss ratio compared with control, and decreased from 36% to less than 7% in fungal incidence. In the case of fungi in the EP treatment group, hyphae did not grow on the outside of the strawberry but grew to the inside. This tendency was similar to that in the low oxygen and high carbon dioxide environment of the MAP, the mycelium of the fungus did not grow outside of the strawberry. Fungi are the biggest problem in the distribution and export of strawberries, and these results suggest that MAP alone could inhibit mold and increase shelf life.

Effect of Vitamin C Treatments on the Storability of Baby Vegetables in MA storage (저장전 비타민 C 처리가 베이비채소의 MA 저장중 저장성에 미치는 영향)

  • Kang, Ho-Min;Kim, Il-Seop
    • Journal of Bio-Environment Control
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    • v.16 no.4
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    • pp.420-425
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    • 2007
  • This study was conducted to find out the effect of vitamin C treatments on the storability of several baby vegetables; endive, green romaine lettuce, pak-choi, red romaine, lollo rosa, and ssamchoo. The vitamin C was treated by the foliar spray which was carried out 3 times before harvest or dipping in vitamin C solution for 5 minutes after harvest. The vitamin C contents of 6 different baby vegetables were higher in vitamin C treatments than control, whereas the difference of vitamin C content between treatments was disappeared after storage. The fresh weight of ssamchoo and lollo rosa lettuce treated by vitamin C was maintained higher than that of control. There was not significant difference in visual quality among treatments, though some of baby vegetables treated by washing with vitamin C showed better visual quality than the others. The contents of carbon dioxide, oxygen and ethylene in MAP with baby vegetables did not show any difference among treatments. As the result, high concentrated vitamin C treatment, such as the foliar spray and washing (dipping) had a role of increasing functionality, but the enhanced functionality, high vitamin C, did not affect storability in baby vegetables.

Antioxidant Activity of Black Garlic (Allium sativum L.) (흑마늘의 항산화 활성)

  • Shin, Jung-Hye;Choi, Duck-Joo;Lee, Soo-Jung;Cha, Ji-Young;Sung, Nak-Ju
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.37 no.8
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    • pp.965-971
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    • 2008
  • The antioxidant activities of hot water and ethanol extracts from fresh, steamed and black garlic were compared. The levels of phenolic compounds of extracts from fresh, steamed and black garlic were $0.81{\sim}0.99\;mg$/100 g and their contents were not significantly different. The contents of flavonoids in ethanol extracts, $0.96{\pm}0.05{\sim}1.06{\pm}0.09\;mg$/100 g, was higher than hot water extracts. DPPH radical scavenging activity was higher in ethanol extract. Although the highest level was $69.40{\pm}0.13%$ in concentration of 10 mg/mL from black garlic ethanol extract, ethanol extracts showed $50.55{\pm}1.40%$ in concentration of 15 mg/mL. Reducing power was significantly higher in black garlic extract and higher in the order of black garlic> fresh garlic> steamed garlic in ethanol extract. Hydroxyl radical scavenging activity was higher in ethanol extract, showing over 60% in concentration of 5 mg/mL. In oil emulsion, TBA value was significantly lower in hot water extracts from black garlic, however ethanol extracts were not significantly different. TBA value of ethanol extract were $1.49{\pm}0.08{\sim}2.11{\pm}0.16\;MA\;mg/kg$ and $1.33{\pm}0.18{\sim}1.62{\pm}0.19\;MA\;mg/kg$ from steamed and black garlic, respectively. Antioxidant activity to the linoleic acid was $72.71{\pm}2.17{\sim}88.74{\pm}3.70%$ in 1-day storage, but its level was increased at 4-day storage to $86.67{\pm}3.76{\sim}92.50{\pm}0.87%$.

Comparative Quality Evaluation of King Oyster Mushroom as Affected by Unit Packaging Method during Simulated Export Shipment (큰느타리버섯의 모의 수출운송과정에서 소포장 적용에 따른 품질변화 비교)

  • Woo, Seong-Min;Park, Youn-Moon;Park, Se Won
    • Horticultural Science & Technology
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    • v.31 no.2
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    • pp.186-193
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    • 2013
  • Potential of consumer unit packaging was investigated for quality maintenance during export simulation in king oyster mushrooms (Pleurotus eryngii). Mushrooms were harvested in late May, precooled to $4^{\circ}C$ within 6 hours, and then packaged for shipping in two ways: 2 kg bulk packaging in a polyethylene (PE) bag or three types of unit packaging methods such as 400 g in polypropylene film bag (PPB), 200 g on styrofoam tray + PE shrinkage film wrapping (STW), and 200 g in polyethylene terephthalate (PET) containers (PETC). For local distribution of bulk-packaged commodity, mushrooms were sorted again and packaged into 3 consumer units in the same way as for the initial shipping packages. Simulation of refrigerated container shipping was performed in a walk-in type pilot storage at $0.5^{\circ}C$ for 5 weeks, while local marketing simulation was carried out on the shelf at $7^{\circ}C$ for 7 days. During the shipment simulation, creation of modified atmosphere (MA) was substantial in 2 kg bulk packages with low $O_2$ below 2% and high $CO_2$ over 15% whereas, in PPB and PETC unit packages, relatively higher $O_2$ concentrations were observed. On the shelf at $7^{\circ}C$, $CO_2$ concentrations rapidly increased in PPB and PETC packages despite the short marketing period. Overall marketability evaluated by off-flavor, browning, and texture rating was maintained at excellent level when 2 kg bulk packaging in PE or unit packaging in PPB and PETC were used for shipment. In contrast, establishment of MA was very slight in STW packages during shipment and local distribution resulting in poor quality after export simulation. The results suggested that shipment using adequate consumer unit packaging is more practical and economically beneficial than using bulk packaging in the export program consisting of 5-week shipment and 7-day local distribution.

Quality Characteristics of Low-fat Emulsified Sausage Containing Tomatoes during Cold Storage (토마토가 함유된 저지방 유화형 소시지의 냉장 저장 중 품질 특성)

  • Hoe, Soon-Ku;Park, Ki-Hoon;Yang, Mi-Ra;Jeong, Ki-Jong;Kim, Dong-Hoon;Choi, Jine-Shang;Jin, Sang-Keun;Kim, Il-Suk
    • Food Science of Animal Resources
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    • v.26 no.3
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    • pp.297-305
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    • 2006
  • This study was conducted to evaluate the quality characteristics of low-fat emulsion type sausages containing 0% tomato powder (C), 5.0% ground raw tomato paste (T1) and 0.5% freeze dried tomato powder (T2) during storage at $5{\pm}1^{\circ}C$ for 30 days. The crude protein content of T2 was significantly lower (p<0.05) than that of the other sausage types. Moisture, crude fat and crude ash contents of the sausages during storage were not affected by the addition of tomato. The pH and shear force ($kg/cm^2$) values of C were significantly higher (p<0.05) than those of T1 and T2. There was no significant difference among the different sausages in cooking loss, ranging from $13.00{\sim}14.98%$. The WHC values of T1 and T2 were significantly higher (p<0.05) than that of C. The values of TBARS were significantly (p<0.05) increased for ail sausages following storage. The TBARS value (mg MA/kg) of C was significantly higher (p<0.05) than those of T1 and T2 at 15 days of storage, however T1 was significantly higher (p<0.05) than the other sausages after 30 days of storage. The meat color values tended to decrease with increased storage time. Microorganism analysis revealed that all sausage types did not reach $4.4log_{10}CFU/g$ until 30 days of storage. The texture, brittleness, Hardness, and springiness of each sausage type were not significantly different after 1 day of storage, while the cohesiveness, gumminess and chewiness of T1 and T2 were significantly higher (p<0.05) than that of C. T1 and T2 sausages had a slightly higher score regarding color, aroma, tenderness and overall acceptability, however the sensory evaluation score among the different sausage types was not significantly different (p>0.05). In conclusion, low-fat sausage with added tomato showed higher lipid oxidative stability during storage than sausage to which no tomato was added.