• Title/Summary/Keyword: 저온저장

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Mineral Composition and Physical Properties Change of Chicken Muscle (계육(鷄肉)의 무기물(無機物) 조성(組成)과 물리적(物理的) 성질(性質)의 변화(變化))

  • Chung, Byoung-Yeol;Yang, Cheul-Young
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.11 no.4
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    • pp.47-52
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    • 1982
  • This experiment was carried out to investigate the minerals content and post-mortem biochemical change of broiler leg and breast muscle during hot and cold storage period. The leg and breast muscle samples were stored at $2^{\circ}C$and $30^{\circ}C$ for 32 hours, and analyzed 0, 4, 8, 32 hours after slaughter, the results obtained as follows (1) Minerals composition were different between breast and leg muscle. (2) Total nitrogen content changed according to the storage period and temperature in the breast (P<0.005) and the leg (P<0.005) (3) The Content of phosphate (P<0.005), magnesium (P<0.005), sodium (P<0.025) in breast muscle was higher than in the leg mucle, and did not change according to the storage period and temperature. (4) Calcium and iron contents were not different between breast and leg muscle but significantly changed according to the storage period and temperature. (5) Sodium content was not different among the various factors, and pH was different between leg and breast (P<0.005) muscle, and ultimate pH was appeared at 8 hours of slaughter, but 20 hours of slaughter in hot stored breast muscle. (6) pH decline in cold stored breast muscle was faster than in the hot stored. (7) Penetration value was higher in the breast muscle than in the leg muscle (P<0.005) (8) Regormortis were not occurred in cold stored breast muscle and hot stored leg muscle, but occurred in cold stored leg muscle and hot stored breast muscle at 4 hours after slaughter.

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Causal Factors of Black Stain during Cold Storage of Pear(Pyrus pyrifolia cv.Niitaka) and Its Postharvest Control (신고' 배 저온 저장중 발생하는 얼룩과 원인 및 방지)

  • 홍윤표;정대성;이승구
    • Food Science and Preservation
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    • v.10 no.4
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    • pp.447-453
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    • 2003
  • Causal factors related to the skin disorder such as black stains during cold storage of 'Niitaka' pear fruit are of great importance to solve the postharvest disorder problems. The morphological and biochemical changes observe of pear skin affected by different harvest times and storage environments. Occurrence rate of black stain in 'Niitaka' pear fruit was the highest in newspaper bagging with 75% among various bagging materials at harvest time because of the high relative humidity within the double layer paper bags. During cold storage, the rate was 54~100% in 30 $\mu\textrm{m}$ polyethylene (PE) film packaging. As the harvest time was postponed, the rate increasedduring cold stoinge. The into was 1.5 to 2.4 times higher in pears harvested in late September than in those harvested in early and mid October. There was no significant difference in occurrence of black stain fruit between the 30 and 50 $\mu\textrm{m}$ PE film bags. The causal fungus of the black stain pear was assumed as Gloeodes pomigena (Schweintz, 1920). The treatment of 0.1~0.5 ppm ozone gas prevented the occurrence of the pear fruit black stain until 180 days after cold storage. The ozone treatment on the affected fruit was also effective in preventing the progress of the black stain.

Production of Vinegar Using Deteriorated Deastringent Persimmons during Low Temperature Storage (저온저장 중 품질이 저하된 단감을 이용한 식초의 제조)

  • 홍정화;이기민;허성호
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.25 no.1
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    • pp.123-128
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    • 1996
  • 저온저장 중 품질 열화가 일어난 단감의 산업적 이용성을 증진하기 위한 감식초의 가공조건을 조사한 결과, 연화된 단감을 폐쇄하여 종초 10%와 알코올 4%를 첨가한 후 발효온도 3$0^{\circ}C$에서 2주 이내에 산도 4%이 상인 감식초가 발효되었으며, 15$^{\circ}C$에서 3주간의 숙성 조건에서 식초 고유의 향미가 형성된 반면 포도당과 초산의 첨가는 최종 제춤의 품질을 저하시키는 결과를 얻었다. 연화된 단감의 열처리 효과는 잡균에 의한 오염 가능성을 제거시킬수 있었기 때문에 품질의 안정화를 위한 필수적인 공정으로 볼 수 있었다. 종초에서 분리된 산생성 균주의 생육과 산생성능을 조사한 결과, AH-1은 발효초기에 증식한 반면 AH-2는 발효 푸기에 증식하면서 산을 생성하였다. 따라서 이런 균주들이 서로 어우러져 최종적인 감식초의 품질을 결정하는 것으로 사료되었다. 감식초의 유기산 성분은 대부분이 acetic acid로 구성되어 있었고, 그 다음은 $\beta$-galac-turonic acid였다. 그리고 tanin 함량은 시판제품에 비하여 16~44mg% 정도 적게 나타났다.

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감귤저장시 부패균 증식억제를 위한 식물유래 천연항균제 탐색

  • Ha, Cheol-Gyu;Lee, Dong-Gyu;Gang, Seon-Cheol
    • 한국생물공학회:학술대회논문집
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    • 2000.04a
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    • pp.453-456
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    • 2000
  • Antifungal activities of domestic plants were examined to develope natural antimicrobial agents, able to protect citrus fruits from spoiling microorganism during their storage. A fungus was isolated from citrus fruits' storage and identified to Penicillium sp. CF-301, based on the morphological characteristics of conidiophore and conidia; flask shape of phialide, simple branching type of conidiophore, and columnar shape of conidial head, in malt extract agar and potato dextrose agar media. Chloroform extracts of Juniperus chinesis Linnaeus, J. chinesis var. horizontalis showed remarkable antifungal activities against Penicillium sp. CF-301.

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Growth and Flowering of Eustoma grandiflorum as affected by Duration of Seedling Storage at 1$0^{\circ}C$ (고온기 육묘에서 유묘의 저온처이기간이 꽃도라지의 생장과 개화에 미치는 영향)

  • 강종구;이범선;정순주
    • Journal of Bio-Environment Control
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    • v.7 no.2
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    • pp.109-115
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    • 1998
  • This study was conducted to evaluate the growth and flowering responses of Eustoma grandiflorum cv. Azmasul, Azmahoon and Azmazo influenced by duration of storage at 1$0^{\circ}C$ of seedlings raised in warm season. The plants after cold treatment were cultivated in a glasshouse under natural day length with the minimum temperature of 12$^{\circ}C$. The stem thickness and number of leaves of Azmasul and Azmahoon were not affected by duration of cold treatment However, plant height, internode length fresh and. dry weights were significantly increased in the four-week treatment. In addition, four-week treatment increased flower weight and width. Bays to flowering of Azmasul and Azmahoon in four-week treatment were shortened by 20 days compared to the control or two-week treatment. Shoot growth and flower Qualify of Azmazo under the four-week treatment were promoted. Four-week treatment reduced the days to flowering of Azmazo by 31 and 36 days compared to the control and two-week treatment. The results of this study show that optimum duration for storage at l$0^{\circ}C$ for seedlings of Ewtoma grandiflorum cv Azmasul. Azmahoon and Azmazo grown in warm season is four weeks.

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