• 제목/요약/키워드: chilling storage

검색결과 95건 처리시간 0.018초

저온저장중 개갑인삼종자내의 생리활성물질 동정 및 변화 (Identification and Changes of Physiologically Active Substances During Chilling Storage of Dehisced Ginseng Seeds)

  • 권우생;백남인;이정명
    • Journal of Ginseng Research
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    • 제21권1호
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    • pp.13-18
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    • 1997
  • Identification and changes of physiologically active substances during chilling storage of dehisced ginseng (Panax ginseng C. A. Meyer) seeds were analyzed using various preparatory separation methods and purification columns; Dowex 50W and silica gel columns. Seven components with Rf values of 0.20, 0.40, 0.58, 0.66, and 0.70 In solvent system, $CHCl_3$:MeOH=3:1 (v/v), Rf values of 0. 63 and 0.74 in solvent system, $CHCl_3$:MeOH:$H_2O$:=7:3:1 (v/v) were obtained through Dowex 50W and silica gel column chromatographies. Two components with Rf values of 0.20 and 0.63 in the all chilling treatments were detected in the extract obtained through both chromatographies, and only the former component was gradually increased till 4 weeks of chilling storage and then rapidly decreased from 8 to 16 weeks. UV spectra of Rf values of 0.66 and 0.56 were similar to that of cytokinin, but their physiological activities were not found. Rf values of 0.20 showed activity by radish cotyledon expansion bioassay. The component with Rf value of 0.20 was revealed to have a naphthalene in the proposed chemical structure by various NMR techniques.

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자두 '대석조생'의 숙기 및 저온저장 온도에 따른 저온장해과 발생 및 품질특성 (The Chilling Injury Development and Quality Characteristics of 'Ooishiwase' Plums (Prunus salicina L.) according to Ripening Stages and Cold Storage Temperature)

  • 조미애;홍윤표;최선영;정대성;임병선;박수정;이승구
    • 한국식품저장유통학회지
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    • 제18권5호
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    • pp.651-660
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    • 2011
  • 자두 '대석조생'의 생육단계별 수확시기 및 저온저장 온도에 따른 저온장해과 발생 양상과 품질 특성을 구명하고자 하고자, 자두 '대석조생'을 60%, 80% 그리고 90% 이상의 착색율로 구분하여 수확한 후, 1, 4, 5, $6^{\circ}C$ 그리고 $20^{\circ}C$에 최대 48일간 그리고 $20^{\circ}C$에서 3일간 숙성시키면서 호흡 변화, 품질 특성 및 저온 장해과 발생 양상을 조사하였다. 60% 착색기에 수확한 자두를 보다 낮은 저온에 저장하였을때 경도, 색도, 중량감소율과 적정산도의 유지에 효과적이었으며, 이 조건에서 에틸렌 발생량과 호흡량도 보다 낮게 유지되었다. '대석조생' 자두의 저온장해 증상은 주로 내부 갈변을 동반한 gel breakdown과 과육투명화 현상이었는데, 이러한 저온장해과는 모든 숙기별 처리구 그리고 $6^{\circ}C$ 이하의 모든 저장 온도에서 발생하였다. 그러나 성숙이 진행되지 않은 과일일수록, 그리고 저장 온도가 낮을수록 저온장해과 발생율을 낮게 나타났다. 이 결과는 '대석조생' 자두의 저온장해과 발생이 저장기간 동안의 호흡 양상과 관련되어 있음을 의미한다.

Improvement of Shelf-life and Quality in Fresh-Cut Tomato Slices:

  • Hong Ji Heun
    • 한국식품저장유통학회:학술대회논문집
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    • 한국식품저장유통학회 2004년도 총회및 심포지움
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    • pp.67-72
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    • 2004
  • Quality of fresh-cut tomato slices was compared during cold storage under various modified atmosphere packaging conditions. Chilling injury of slices in containers sealed with Film A was higher than with Film B; these films had oxygen transmission rates of 87.4 and 60.0 ml $h^{-1}\;m^{-2}\;atm^{-1}$ at $5^{\circ}C\;and\;99\%$ RH, respectively. While slices in containers with an initial atmospheric composition of air, $4\%\;CO_2+1\;or\;20\%\;O_2,\;8\%\;CO_2+1\;or\;20\%\;O_2,\;or\;12\%\;CO_2+20\%\;O_2$ showed fungal growth, slices in containers with $12\%\;CO_2+1\%\;O_2$ did not. Low ethylene in containers enhanced chilling injury. Modified atmosphere packaging provided good quality tomato slices with a shelf-life of 2 weeks or more at $5^{\circ}C$. Experiments were conducted to compare changes in quality of slices of red tomato (Lycopersicon esculentum Mill. 'Sunbeam') fruit from plants grown using black polyethylene or hairy vetch mulches under various foliar disease management systems including: no fungicide applications (NF), a disease forecasting model (Tom-Cast), and weekly fungicide applications (WF), during storage at $5^{\circ}C$ under a modified atmosphere. Slices were analyzed for firmness, soluble solids content (SSC), titratable acidity (TA), pH, electrolyte leakage, fungi, yeasts, and chilling injury. With both NF and Tom-Cast fungicide treatments, slices from tomato fruit grown with hairy vetch (Vicia villosa Roth) mulch were firmer than those from tomato fruit grown with black polyethylene mulch after 12 days storage. Ethylene production of slices from fruit grown using hairy vetch mulch under Tom-Cast was about 1.5- and 5-fold higher than that of slices from WF and NF fungicide treatments after 12 days, respectively. The percentage of water-soaked areas (chilling injury) for slices from tomato fruit grown using black polyethylene mulch under NF was over 7-fold that of slices from tomato fruit grown using hairy vetch under Tom-Cast. When stored at $20^{\circ}C$, slices from light-red tomato fruit grown with black polyethylene or hairy vetch mulches both showed a rapid increase in electrolyte leakage beginning 6 hours after slicing. However, slices from tomato fruit grown using the hairy vetch mulch tended to have lower electrolyte leakage than those grown with black polyethylene mulch. These results suggest that tomato fruit from plants grown using hairy vetch mulch may be more suitable for fresh-cut slices than those grown using black polyethylene mulch. Also, use of the disease forecasting model Tom-Cast, which can result in lower fungicide application than is currently used commercially, resulted in high quality fruit for fresh-cut processing. Experiments were conducted to determine if ethylene influences chilling injury, as measured by percentage of slices exhibiting water-soaked areas in fresh-cut tomato slices of 'Mountain Pride' and 'Sunbeam' tomato (Lycopersicon esculentum Mill.). Ethylene concentration in containers without ventilation significantly increased during storage at $5^{\circ}C$, whereas little or no accumulation of ethylene occurred in containers with one or six perforations. Chilling injury was greatest for slices in containers with six perforations, compared to slices in containers with one perforation, and was over 13-fold greater than that of slices in control containers with no perforations. An experiment was also performed to investigate the effectiveness of including an ethylene absorbent pad in containers on subsequent ethylene accumulation and chilling injury. While ethylene in the no-pad controls increased continually during storage of both 'Mountain Pride' and 'Sunbeam' tomatoes at $5^{\circ}C$ under modified atmosphere conditions, no increase in accumulation of ethylene was observed in containers containing ethylene absorbent pads throughout storage. The ethylene absorbent pad treatment resulted in a significantly higher percentage of chilling injury compared with the no-pad control. In studies aimed at inhibiting ethylene production using AVG during storage of slices, the concentration of ethylene in control containers (no AVG) remained at elevated levels throughout storage, compared to containers with slices treated with AVG. Chilling injury in slices treated with AVG was 5-fold greater than that of controls. Further, we tested the effect of ethylene pretreatment of slices on subsequent slice shelf-life and quality. In slices treated with ethylene (0, 0.1, 1, or $10\;{mu}L\;L^{-1}$) immediately after slicing, ethylene production in non-treated controls was greater than that of all other ethylene pre-treatments. However, pretreatment of slices 3 days after slicing resulted in a different pattern of ethylene production during storage. Ihe rate of ethylene production by slices treated with 1 L $L^{-1}$ ethylene 3 days after slicing was greater during storage than any of the other ethylene treatments. With slices pre-treated with ethylene, both immediately and 3 days after slicing, the rate of ethylene production tended to show an negative correlation with chilling injury. Chemical name used: 1-aminoethoxyvinylglycine (AVG).

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GA3, 냉습저장, 무기염 처리가 동의나물 종자의 발아에 미치는 영향 (Effect of GA3, Moist Chilling Storage and Priming Treatment on Seed Germination of Caltha palustris var. membranacea Turcz)

  • 나영진;정정학
    • 화훼연구
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    • 제16권3호
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    • pp.174-178
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    • 2008
  • $GA_3$, 냉습저장 및 무기염 등의 처리가 동의나물의 종자발아에 미치는 영향을 살펴보았다. 동의 나물의 종자는 치상전에 $GA_3$를 처리하면 발아율이 현저히 높아졌다. 종자의 발이촉진을 위해서 $GA_3$를 처리할 경우, $100mg{\cdot}L^{-1}$ 용액에 1시간 정도 침지처리 하는 것이 가장 효과적인 것으로 나타났다. 동의나물의 종자발아에 있어서 냉습저장은 현저한 효과를 나타내었으며 저장기간 5주가 발아율이 60.3%로 가장 높았다. 또한 냉습저장의 효과는 $GA_3$ 처리효과에 비해서도 월등하게 좋았다. 그러나 $GA_3$나 냉습저장의 효과와는 달리 $Ca(NO_3)_2$$KNO_3$ priming처리는 동의나물의 종자발아촉진에 효과가 없었다.

침지냉각 조건에 따른 닭 도체의 수분 흡수 및 감량 비교 (Comparison of Water Retention and Loss of Chicken Carcasses by Different Water Chilling Condition)

  • 이재청;김병기;전진안;임찬혁;김효선;이경우
    • 한국가금학회지
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    • 제41권3호
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    • pp.159-164
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    • 2014
  • 본 실험은 닭고기 가공 공장별로 침지냉각에 따른 닭 도체의 수분 흡수율 및 감소율 그리고 신선도를 측정 비교하여 품질의 균일화 제고를 위하여 실시하였다. A도계장과 B도계장 닭고기 가공 공장에서 1회 각 40수씩 3회에 걸쳐 총 240수에 대하여 수분 흡수율 및 신선도를 측정하였으며, 수분 흡수율 실험이 완료된 도체에 대하여 개체 포장, 운송하여 실험실 냉장고($4{\pm}1^{\circ}C$)에 입고 후, 저장일별 수분 감소율 및 신선도를 측정하였다. 실험 결과, 수분 흡수율은 A도계장 4.8%, B도계장 4.2%로서 유의적인 차이는 발견되지 않았다. B도계장 실험 도체의 신선도가 냉각 전후 모두, A도계장 실험 도체보다 신선도가 유의적으로 높게 조사되었다. 저장일별 수분 감소율은 A도계장 실험 도체와 B도계장 실험 도체 사이에 유의적인 차이는 나타나지 않았다. 저장일별 신선도는 A도계장 실험 도체가 B도계장 실험 도체에 비해 낮게 조사되었다. 결론적으로 수분 흡수율은 chiller의 길이나 침지시간에 크게 영향을 받지 않으나, 수분 감소율은 침지 시간, 수온 및 심부 온도의 영향을 받는 것으로 예측되었다.

냉각방법과 포장방법에 따른 냉장계육의 이화학적 특성 변화 (Effects of Chilling and Packing Methods on Physico-chemical Properties of Cold-stored Chicken Breast and Thigh Meats)

  • 박구부;하정기;진상근;박태선;신택순;이정일
    • 한국가금학회지
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    • 제24권1호
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    • pp.17-28
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    • 1997
  • This experiment was carried out to investigate the effects of different chilling and packing methods on physico-chernical properties of cold-stored chicken breast and thigh meats. Dehoned chicken breast and thigh meats were chilled either air spray or ice-water immersion method. The chilled meats were either vacuum packed or atmosphere packed, and stored at -2˚C for 1, 3, 7, 11, 15, and 20 days. The pH of both immersion chilled meats and vacuum packed meats were higher than those of their counterparts(P<0.05). The pH of atmosphere packed meats increased as the storage period extended. The moisture contents of vacuum packed meats were remarkably higher than those of atmosphere packed meats. The pH of all treatments decreased as the storage period extended. The shear values of air spray chilled and vacuum packed breast meats were significantly higher than immersion chilled and vacuum packed ones. However, immersion chilled and atmosphere packed breast meats were significantly higher than those of air spray chilled and atmosphere packed breast meats. The shear values of immersion chilled and vacuum packed thigh meats were significantly higher than those of immersion chilled and vacuum packed thigh meats. In atmosphere packed thigh meats, air spray chilling method showed higher shear values than those of immersion chilled thigh meats. In thigh muscle, tenderness values tended to decrease as the storage period extended(P<0.05). Contents of water soluble proteins of vacuum packed and air spray chilled breast and thigh meats were higher than those of their counterparts as the storage period extended(P<0.05). The contents of water soluble proteins significantly decreased as the storage period extended. Salt soluble proteins of atmosphere packed breast and thigh meats were remarkably higher than those of vacuum packed ones(P<0.05). Total lipid contents of atmosphere packed and air spray chilled breast and thigh meats were higher than those of atmosphere packed and immersion chilled meats as the storage period extended. The vacuum packed meats were significantly higher in total lipid contents than those of atmosphere packed meats. The storage period decreased the total lipid contents of cold chicken, Major fatty acids in cold-stored chicken were oleic, palmitic, linoleic and stearic acids, regardless of chilling method. Unsaturated fatty acids of all treatments decreased, but saturated fatty acids increased as the storage period extended.

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CA 저장에 의한 청매실의 저온장해 발생 억제 및 품질 특성 유지 효과 (Suppression of Chilling Injury and Maintenance of Quality Characteristics in Prunus Mume Fruits Stored under Controlled Atmosphere)

  • 최선영;조미애;홍윤표;황인경;정대성;윤석규
    • 한국식품저장유통학회지
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    • 제18권2호
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    • pp.143-148
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    • 2011
  • 실용적인 CA 처리 방법을 이용하여 매실 '남고'의 저장성 향상 및 저온장해과 발생 억제에 관한 기초 자료를 얻고자 본 연구를 수행하였다. 매실 '남고'를 1, 5, $9^{\circ}C$에 저장하면서 최적 CA 조성으로4% $O_2$ +75% $CO_2$ 의 농도를 선정하여 사용하였다. 매실의 상온 저장시에는 황변현상과 조직의 연화가 빠르게 진행되어 수확 후 3~4일 이내에 상품성이 없어지는 문제점이 있다. 이산화탄소와 에틸렌 생성량은 CA 저장구에서 유의적으로 줄었다. 또한, Hue 값은 CA 저장으로 감소폭이 줄었으며, 특히 $9^{\circ}C$ 대조구에서 낮은 값을 나타내었고, 1, $5^{\circ}C$에서 저장 30일까지 녹색을 유지하였다. 중량감소율, 당도, 산도의 경우 대조구에 비해 CA 저장구에서 유의적으로 유지되었으며, 전해질 유출 정도도 CA 저 장구에서 낮은 값을 나타내었다. CA 처리를 한 매실의 경우 모든 저장 온도구에서 저온 저장 30일까지 과피갈변, surface pitring 등 저온장해과가 발생하지 않았고, 부패율 역시 CA 저장구에서 유의적으로 낮게 나타났다. 저장 30일경에 $5^{\circ}C$$9^{\circ}C$ 대조구에서 황변현상, 생리장해과, 부패과가 발생되었으나, CA 저장 시험구는 효과적으로 억제되었다. 따라서 매실 '남고'를 CA 저장 시$1^{\circ}C$가 가장 적합한 것으로 선정되었고, 매실 저장 시 주요한 문제점인 황변현상, 연화, 저온장해과, 부패율이 효과적으로 억제되었다.

도계육 냉각공정 방식에 따른 보존성 비교 (Comparison of preservation in poultry carcasses processed by different chilling systems)

  • 김경택;김지현;박영민;명근식;박태욱
    • 한국동물위생학회지
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    • 제40권4호
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    • pp.245-251
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    • 2017
  • Cold air or ice water are used to chill poultry carcasses after slaughter. In order to compare the microbial reduction effect of two different chilling systems in poultry carcasses, Pre-and post-chilled carcass samples were tested for contamination agents such as aerobic bacteria counts, E. coli counts and Salmonella spp. counts. Water chilling system showed higher reduction ratio of bacteria than air chilling system during the three seasons. Also, aging of slaughter facility was related with bacterial contamination of pre-chilld carcasses. And additional volatile basic nitrogen (VBN) test were conducted in poultry packing meats and it increased steadily during 15 days. VBN at 8~9 days were over 13 mg% with putrid smell. Poultry packing meats by water chilling system were fresher than air chilling system during early storage time. But those decayed faster after 9 days.

수확 후 고온처리가 참외의 저온장해 완화와 저장성 향상에 미치는 영향 (Effects of Postharvest Heat Treatment on Alleviation Chilling Injury and Improvement Storability of Oriental Melon)

  • 강호민;박권우;김일섭
    • 생물환경조절학회지
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    • 제14권3호
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    • pp.137-143
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    • 2005
  • 저장전 고온처리($38^{\circ}$, 48시간)는 참외의 당도, 산도, 비타민 C의 함량과 ${\alpha}$-tocopherol 활성을 높였으며, $3^{\circ}C$의 MA저장중 생체중 감소 이산화탄소, 에틸렌그리고 아세트알데히드 발생량을 낮게 유지시켰다. 또한 저장후 외관상 품질, 경도, 당도, 산도, 비타민 C, ${\alpha}$-tocopherol 활성 등 내적품질이 고온처리한 참외에서 높은 수준을 유지하였는데 특히 저온장해정도를 알 수 있는 이온용 출량이 고온처리구에서 낮아 수확후 고온처리로 저온장해가 완화되었음을 알 수 있었다. 고온처리를 하지 않은 대조구는 저장 25일부터 Alternaria rot이 발견되었으나 고온처리구는 저장 종료일인 39일까지 부패가 발견되지 않았으며 외관상 품질에 대한 저장일수로 세운 회귀식에 의하면 저장수명이 고온처리구에서 8일 이상 연장되었다. 참외의 경우 저장전 $38^{\circ}C$의 낮은 고온에서 장시간 열처리를 함으로써 살균효과 저온장해 완화효과와 더불어 수명연장까지 얻을 수 있었다.

Breaker 단계 토마토의 착색불량과 호흡률간 상관관계 (The Correlation between Uneven Ripening and Respiration Rate of Tomato at Breaker Stages)

  • 강호민;김영식
    • 생물환경조절학회지
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    • 제19권2호
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    • pp.93-96
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    • 2010
  • Breaker 단계 토마토의 저온장해 증상은 착색불량과 호흡률 증가 등으로 알려져 있다. 본 실험은 이러한 저온 장해 증상과 맞물려 나타나는 이산화탄소 발생 증가와의 관계를 분석하고, 나아가 저장 중 원예산물 저온장해의 판단기준으로 이용할 수 있는 기초 자료를 만들고자 실시하였다. Breaker 단계로 선별된 토마토는 $2^{\circ}C$에서 1차로 0, 3, 6, 9일간 2차로 0, 1, 2, 3, 10일간 저장 후 상온으로 옮겨 3, 6, 9, 12, 24, 36, 48시간마다 호흡률을 측정하였다. 저온장해로 인한 토마토 과실의 호흡률은 1일 저장 처리구부터 증가하였으며 저온 저장기간이 길어질수록 발생량 증가폭도 커졌다. Breaker 단계 토마토의 과피색은 $a^*$ 값으로 나타내었는데 각 기간별로 저온저장 후 상온으로 옮겨 10일째에 측정하였는데 Breaker 단계 토마토는 2일 저장 처리구부터 $a^*$ 값이 증가가 둔화되면서 착색불량이 나타났다. 저온저장 기간에 증가함에 따라 증가한 호흡률과 반대로 감소한 $a^*$ 값의 상관계수(r)는 0.9716로 1%의 유의성을 나타내었다 이상의 결과로 보아 Breaker 단계 토마토의 경우 저온 저장후 상온으로 옮긴 직후 이산화탄소 발생 양상으로 저온장해를 미리 진단할 수 있었으며, 그 발생량 증가폭으로 저온장해 정도도 파악할 수 있을 것으로 생각된다.