• 제목/요약/키워드: storage time and temperature

검색결과 1,244건 처리시간 0.026초

Effects of Storage Temperature and Time on the Quality of Eggs from Laying Hens at Peak Production

  • Jin, Y.H.;Lee, K.T.;Lee, W.I.;Han, Y.K.
    • Asian-Australasian Journal of Animal Sciences
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    • 제24권2호
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    • pp.279-284
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    • 2011
  • The objective of this study was to evaluate the effects of storage temperature and time on the quality parameters of eggs from laying hens at peak production. A total of 576 eggs were obtained from Lohmann Light-Brown hens, which were collected 3 times when the hens were 26, 27, and 28 weeks old. The fresh eggs were collected and measured within 2 h of being laid. Samples of 48 eggs each were stored in chambers for 2, 5, or 10 d inside a refrigerator ($5^{\circ}C$), at room temperature ($21^{\circ}C$), and at a high temperature ($29^{\circ}C$). As the storage temperature and time increased, egg weight, percentage of albumen, Haugh unit (HU), and yolk color significantly (p<0.001) decreased. In addition, egg shell weight, shell percentage, and albumen weight significantly (p<0.001) decreased with storage time. Yolk weight, yolk percentage, and albumen pH significantly (p<0.001) increased with increasing storage temperature, and yolk pH significantly (p<0.001) increased with increasing storage time. When the storage temperature was increased to $29^{\circ}C$, egg weight loss dramatically increased from 1.74 to 3.67% at 5 and 10 d of storage time, respectively. With the exception of the $5^{\circ}C$ storage temperature, HU dramatically decreased according to storage time and temperature, decreasing from 91.3 to 72.63 at $21^{\circ}C$ and from 87.62 to 60.92 at $29^{\circ}C$ during 10 d of storage; however, this decline was not found at $5^{\circ}C$. A rapid increase in albumen alkalinity was observed even after just 2 d of storage regardless of the storage temperature. Interactions between storage time and temperature were significant (p<0.001) with respect to egg weight loss, egg shell weight and percentage, albumen weight and percentage, yolk weight and percentage, albumen and yolk pH, HU, and yolk color. The results of the current study indicated that eggs from laying hens at peak production had significant deterioration of internal quality with increasing storage temperature and time. The results suggest that egg weight loss, albumen pH, and HU are parameters that are greatly influenced by the storage temperature and time of eggs from hens at peak laying.

계란의 저장·보관 조건에 따른 위생적 품질 변화 (Effects of Storage Time and Temperature on the Hygienic Quality of Shell Eggs)

  • 김종규;박정영;김중순
    • 한국환경보건학회지
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    • 제41권6호
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    • pp.438-448
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    • 2015
  • Objectives: This study was performed to examine the effects of storage time and temperature and their interaction on the hygienic quality parameters of shell eggs. Methods: Eggs from 40-week-old Hy-Line Brown hens were sampled immediately after being laid and subjected to storage periods of four weeks at a refrigerated temperature ($4-5^{\circ}C$) or room temperature ($13.0-19.7^{\circ}C$). Interior/exterior qualities were examined every one week. Results: Weight loss was 2.4-3.1%. The initial specific gravity of the eggs was maintained until one week at both temperatures. Air cell size exceeded 4 mm when stored for one week at room temperature, and two weeks at refrigerated temperature. Albumen index and Haugh unit were significantly decreased at both temperatures after one week (p<0.001). Rapidly increased pH of the albumen with one week of storage was observed, regardless of temperature (p<0.001). Extension of the storage for up to four weeks at room temperature resulted in remarkable deterioration of eggshell quality and instrumental color as redness (a). Air cell size, albumen and yolk indices, Haugh unit, pH of albumen and yolk were found to be influenced by storage time and temperature (p<0.001). Interaction effects between storage time and temperature were also significant for air cell size, pH of albumen and yolk (p<0.001). Conclusion: The results suggest that air cell size and pH of albumen and yolk were important parameters influenced by storage time and temperature in shell eggs. Storage time was more influential for air cell size, and temperature for the pH of yolk. Both variables almost equally influenced the pH of albumen.

Dynamic Rheological Invest igation of Hot Pepper-soybean Paste Mixed with Acetylated Starch: Effect of Storage Time and Temperature

  • Yoo, Byoung-Seung
    • Food Science and Biotechnology
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    • 제17권5호
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    • pp.1119-1121
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    • 2008
  • The effects of storage time (0, 1, and 2 month) and temperature (5, 15, and $25^{\circ}C$) on the dynamic rheological properties of hot pepper-soybean paste (HPSP) mixed with acetylated starches (AS) were studied by small-deformation oscillatory measurements. Dynamic moduli (G', G", and $\eta^*$) values of HPSP-AS mixtures increased with an increase in storage time and also decreased with increasing storage temperature. However, dynamic moduli values of the control (no added AS) were independent on storage time and temperature. Tan $\delta$ values (ratio of G"/G') in all HPSP samples did not change much with an increase in storage time and temperature. After 2 months of storage, the dynamic moduli of the HPSP-AS mixture samples were much lower than those of the control, indicating that the addition of AS can inhibit the retrogradation that developed over a long period of storage. Structural and rheological properties of HPSP samples seem to be stabilized by the presence of AS.

Rice Bagel Premix의 저장에 따른 이화학적 특성 및 제품 특성에 관한 연구 (Physicochemical and Bread Making Properties of Rice Bagel Premix during Storage)

  • 장현호;이명호;최영심;김선경
    • 동아시아식생활학회지
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    • 제22권1호
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    • pp.75-87
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    • 2012
  • We investigated the physicochemical properties, pasting characteristics on the rapid visco analyzer, dough characteristics on a mixograph, product characteristics, and attributes of color and hardness of products made from a wheat bagel premix and rice bagel premix according to storage period and temperature. The pH and moisture content of stored rice bagel premix and wheat bagel premix, significantly decreased, depending on the storage temperature and time. The average of water retention capacity, alkaline water retention capacity, sedimentation value, and pelshenke value all significantly decreased temperature increases and increasing storage time. he initial pasting temperature and breakdown depending on the storage temperature and time showed a significant difference, but peak viscosity and setback with increasing storage time and temperature were not significantly different. The initial pasting temperature did not significantly affect the rice bagel premix. The midline peak time and band at 8 min of mixing time of the wheat bagel premix and rice bagel premix did not differ significantly. In product attributes, the cost of wheat bagel premix rice bagel premix and the L, a, and b value in color of wheat bagel premix showed significant difference. The hardness of wheat bagel premix according to storage time and the hardness of rice bagel premix depending on storage temperature significant difference. Therefore, storage time and temperature of wheat bagel premix and rice bagel premix and does not show significant differences. merchant can get regular and consistent, it is expected to lead to the promotion of rice consumption. Futhermore, research on better method to improve it's characteristics instead of wheat bagel premix is expected to.

The Effect of Storage Period and Temperature on Egg Quality in Commercial Eggs

  • Lee, Min Hee;Cho, Eun Jung;Choi, Eun Sik;Sohn, Sea Hwan
    • 한국가금학회지
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    • 제43권1호
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    • pp.31-38
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    • 2016
  • Consumers demand fresh and high-quality eggs. Egg quality may be represented by shell color, shell weight, egg weight, shell thickness, shell density, albumen height, yolk color, albumen pH and viscosity. Various factors such as strain, age of hen, storage temperature, humidity, the presence of $CO_2$ and storage time affect egg quality. Therefore, we investigated the effects of storage time and temperature on egg quality to define the freshness of Korean market eggs. A total of 1,800 eggs were used for this experiment and were separated into 45 treatments with 40 eggs in each. The treatments were consisted of 15 storage periods (2 d to 30 d) and 3 storage temperatures ($2^{\circ}C$, $12^{\circ}C$, $25^{\circ}C$). Each egg was weighed and broken, and the height of the thick albumen, Haugh units (HU), egg shell color and yolk color were measured by a QCM+system. We also observed the physiochemical properties of eggs such as yolk pH, albumen pH and albumen viscosity. The egg weight, shell weight, albumen height, HU and albumen viscosity significantly decreased with increasing storage time and temperature. However, the albumen and yolk pH significantly increased with increasing storage period and temperature. The interaction effects between the storage period and temperature were significant for shell weight, shell density, egg weight, albumen height, HU, yolk color, yolk pH, albumen pH and albumen viscosity. In the analysis of the correlation with egg quality, the storage temperature exhibited a higher correlation coefficient than the storage period. In conclusion, storage time and temperature are the major factors affecting egg quality, but the storage temperature is a more sensitive determinant of egg quality deterioration compared with the storage period.

Heat Transfer Characteristics of the Spherical Capsule Storage System Using Paraffins

  • Cho, Keum-Nam;Choi, S. H.
    • International Journal of Air-Conditioning and Refrigeration
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    • 제6권
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    • pp.113-123
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    • 1998
  • The present study is to investigate the effect of experimental parameters on the heat transfer characteristics of a spherical capsule storage system using paraffins. N-Tetradecane and mixture of n-Tetradecane 40% and n-Hexadecane 60% were used as paraffins. Water with inorganic material was also tested for the comparison. The experimental parameters were varied for the Reynolds number from 8 to 16 and for the inlet temperature from -7 to 2$^{\circ}C$. Measured local temperatures of spherical capsules in the storage tank were utilized to calculate charging and discharging times, dimensionless thermal storage amount, and the average heat transfer coefficients in the tank. Local charging and discharging times in the storage tank were significantly different. The effect of inlet temperature on charging time was larger than that on discharging time, but the effect of Reynolds number on charging time was smaller than that on discharging time. Charging time of paraffins was faster by 11~72% than that of water with inorganic material, but little difference of discharging time was found among them. The effect of Reynolds number on the dimensionless thermal storage was less during charging process and more during discharging process than the effect of inlet temperature. The effect of the inlet temperature and the Reynolds number on the average heat transfer coefficient of the storage tank was stronger during discharging process than during charging process. The average heat transfer coefficients of the spherical capsule system using paraffins were larger by 40% than those using water.

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청국장 제품의 유통기한 설정을 위한 저장중의 색도변화 및 관능적 특성 monitoring (Monitoring of Color Changes and Organoleptics Properties of Chungkookjang Products during Storage for Shelf-life Establishment)

  • 김동명;김성호;이진만;;강선철
    • Applied Biological Chemistry
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    • 제48권2호
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    • pp.140-149
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    • 2005
  • 청국장 제품의 저장조건 및 유통기간 중에 상품성의 변화를 조사하기 위하여 살균온도, 저장온도 및 저장기간별로 관능적 특성과 색도의 변화를 측정하여 SAS program의 반응표면분석법으로 monitoring하였다. 진공 포장한 청국장의 명도(L)값은 살균온도, 저장기간 및 저장온도 모두 1% 이내에서 유의확률을 가지는 것으로 나타나 세 조건 모두가 명도에 영향성이 높은 것으로 나타났다. 적색도(a)값은 진공포장의 경우 살균온도와 저장온도가 높을수록 증가하며 각기 독립적으로 영향을 미치는 것으로 나타났다. 일반포장의 경우, 저장온도가 높을수록 유의적 값(10% 이내)이 영향을 미치는 것으로 나타났다. 황색도(b)값은 진공 포장한 경우, 저장기간과 저장온도는 1% 이내에서, 살균온도의 경우 5% 이내에서 유의확률을 가지는 것으로 나타났다. 또한 두 포장군 모두 정상점이 안장점의 형태로 나타났다. 관능적 평가 중 외관에 대한 적합성은 두 포장군 모두 저장온도가 1% 이내의 유의확률로 결정적인 영향을 주었고, 냄새에 대한 적합성은 진공포장의 경우 살균온도가 10% 이내의 유의확률로서 관련성이 있었으나, 일반포장은 저장기간이 1% 이내, 살균온도가 5% 이내 유의확률로서 영향성이 있는 것으로 나타났다. 맛에 대한 적합성에서는 진공포장한 경우 저장기간이 1% 이내의 높은 관련성이 있었고, 일반포장은 저장온도가 5% 이내의 유의확률로서 관련성이 있었다. 관능검사의 전체적인 평가에서는 진공포장의 경우 살균온도가 $61.92^{\circ}C$, 저장 온도 $6.79^{\circ}C$, 저장기간 56.48일에서 5.15로 최대 값을 나타내었다.

퍼지논리를 이용한 저온저장고의 온도제어시스템 개발 (Development of Temperature Control System for Cold Storage Room Using Fuzzy Logic)

  • 양길모;고학균;조성인
    • Journal of Biosystems Engineering
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    • 제25권2호
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    • pp.107-114
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    • 2000
  • Low temperature storage method is to increase the value of agricultural products by reducing quality loss and regulate consignment time by controlling respiration rates of agricultural products. Respiration rate of agricultural products depends on several factors such as temperature, moisture, gas composition and a microbe inside the storage room. Temperature is the most important factor among these, which affects respiration rate and causes low or high temperature damage. Fuzzy logic was used to control the temperature of a storage room ,which uses information of uncertain facts and mathematical model for room temperature control . Room temperature was controlled better by using fuzzy logic control method rather than on-off control method. Refrigerant flow rates and temperature deviations were measured for on-off system using TEV(temperature expansion valve) and for fuzzy system using EEV(Electrical Expansion Valve) . Temperature of the Storage room was lowered faster by using fuzzy system than on -off system. Temperature deviation was -0.6~+0.9$^{\circ}C$ for on-off system and $\pm$0.2$^{\circ}C$ for fuzzy system developed. Temperature deviation and variation of temperature deviation were used as inout parameters for fuzzy system. The most suitable input and output value were found by experiment. Cooling rate of the storage room decreased while temperature deviation increased for the sampling time of 20 sec.

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양파의 저장 온도 및 습도에 따른 품질변화 (Quality Changes Based on Storage Temperature and Humidify of Onion)

  • 권중호;이기동;변명우
    • 한국식품저장유통학회지
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    • 제6권2호
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    • pp.143-147
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    • 1999
  • 양파의 저장조건을 저온(2-4$^{\circ}C$, 80% RH), 움식(3-15$^{\circ}C$, 75-85% RH), 실온방열(10-23$^{\circ}C$, 75-98% RH) 및 상온(2-$25^{\circ}C$, 62-72% RH)으로 구분하여 저장 중 물리적 및 화학적 변화를 조사하였다. 저장 중 양파의 발아율은 저온 저장된 양파를 제외하고는 모두 높게 나타났으며, 저온 저장된 양파에서는 저장 11개월까지 거의 발아되지 않았다. 양파의 부패율은 실온방열 저장된 양파를 제외하고는 7개월까지 낮았으나 7개월 이후에는 모두 급격히 부패되었다. 중량감소는 기간이 경과함에 따라 계속되었으며, 저온 저장된 양파에서 가장 적게 일어났다 수분함량은 저온 및 움식 저장된 양파에서 증가하였으나 실온방열 및 상온에서 저장된 양파에서는 감소하였다. 전당과 환원당의 함량은 시간의 경과와 함께 완만하게 감소하였다. Vitamin C는 저장 중 큰 변화가 없었으나 저온 저장된 양파의 경우에는 다소 증가하였다.

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Boundary Elements Heat Transfer Model of Temperature Distribution in Grain Storage Bins

  • T.Abe;C.E.Ofoche;Y.Hikida;Han, D.H.
    • 한국농업기계학회:학술대회논문집
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    • 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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    • pp.922-931
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    • 1993
  • Boundary element method was used to solve heat conduction problem for predicting temperature distribution in grain storage bin. Temperature of grain in storage is one of the three main abiotic factors, besides the intergranular gas composition and the grain moisture content, that determine the keeping quality and control measures used to protect grain from insects and damaging microflora. Collecting the temperature data at various points in the storage bins at different time of the day over a period of time is one way of finding the temperature distribution, this method requires a lot of time, cost and labour and less efficient. However data so collected serve useful purpose of being used to validate predicted temperature distribution using mathematical models. Mathematical models based on physical principles can potentially predict with accuracy the temperature distribution in a grain storage bin. Using the boundary element model the effect of bin wall material, ambient emperature, bin size etc. on temperature distribution can be studied. A knowledge of temperature distribution in stored grain not only helps in identifying active deterioration , but also gives an indication of potential for detection.

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