• Food Science of Animal Resources
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• v.38 no.6
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• pp.1216-1225
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• 2018

Shelf-life is defined as the amount of time during which a food product retains its desired sensory, chemical, and physical characteristics while remaining safe for consumption. The food industry needs to rapidly obtain the necessary information for determining the shelf life of its products. Here we studied the approaches available for conducting accelerated shelf-life tests. Accelerated shelf-life testing is applied to a variety of products to rapidly estimate change in characteristics with time. The aim of this work was to use accelerated shelf-life testing to study the changes in pH, microbiology, and sensory characteristics of ice cream by the application of a kinetic approach and, based on the observations, to estimate its shelf life. As per the current law, there is no shelf life on ice cream. Our results suggest that the shelf life of an ice cream sample was 24.27 months at $-18^{\circ}C$, 2.29 months at $-6^{\circ}C$, 0.39 months at $-1^{\circ}C$, and 0.15 months at $4^{\circ}C$. Results of this study suggest that a set expiration date on ice cream might also contribute to effective management of ice cream characteristics in the retail chilled chain.

• Food Science and Preservation
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• v.14 no.6
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• pp.598-604
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• 2007

Process development and standardization are necessary in maintaining high hygienicquality of side dishes. Seasoned perilla leaves are a typical side dish needing process development. In this study the optimum condition for preparing seasoned perilla leaves was investigated experimentally. The best sensory quality was established by response surface methodology. The rinsing and washing method of preparing fresh perilla leaves was optimized to decontaminate the raw material and preserve the product in chilled storage. Washing and rising with 3% salt water reduced the aerobic bacterial count of perilla leaves to 0.55 (log CFU/g), while rinsing reduced the load from 8.08 to 4.27 (log CFU/g). The effect of rinsing method was maintained during subsequent storage of the prepared seasoned leaves at $10^{\circ}C$. There was no significant quality change in the product during chilled storage at $10^{\circ}C$. Soaking in 3% salt water for 1 min, followed by rinsing with tap water, contributed positively to the microbial quality, and is proposed as the optimal preparation method.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.20 no.1
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• pp.1-6
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• 2014

Properly designed plastic packages of fresh produce can preserve the quality by maintaining the optimal modified atmosphere (MA) at optimal low temperature conditions, but cannot do so at temperature abuse conditions in retail stage due to occurrence of injurious package atmosphere coming from imbalance between respiration and package gas permeation. Master packaging system consisting of a double-layered secondary package wrapping several individual (primary) packages has been proposed and applied recently to the commodities of sweet persimmon, king oyster mushroom, chestnut and strawberry. The master (secondary) pack is designed to be stored and distributed under chilled temperature, and then dismantled when moved to the retail display from the presale chilled storage. The master packaging system taking into consideration temperature dependence of produce respiration and package gas transfer was looked into with examination of its design variables to maintain the beneficial MA. Mathematical model was provided to help the design of master packaging system creating the desired MA. Its benefits of quality preservation and its limitations in practices of fresh produce marketing were discussed. Further research direction to extend the applicability of the produce master packaging system was presented.

• Korean journal of food and cookery science
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• v.16 no.6
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• pp.584-592
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• 2000

Standard recipes of various Korean soups for cook/chill system were developed to provide foodservice managers in kindergarten with more effective management system. Three kinds of soup, Miyuck-gook (Korean sea mustard soup), Soup of beef and radish and Chige of beef and soybean paste (Korean thick soup made of beef and soybean paste) were selected as menu items in this study, and the standard recipes for these soups were developed through sensory evaluation, and microbiological analyses were performed to assure the quality of soup. The microbial counts of the soups which were chilled at 0-3$^{\circ}C$ and stored for 10 days in refrigerator were as follows: Aerobic bacteria were not detected in Miyuck-gook; however, those in Soup of beef and radish were 0.00-1.32${\pm}$0.28 log CFU/g and those in Chige of beef and soybean paste were 3.36${\pm}$0.10- 4.67${\pm}$0.08 log CFU/g. Coliform bacteria were not detected in any soups. All the items of sensory evaluation showed no significant differences between the first and third day of storage, except the flavor, tenderness, chewiness, feeling after swallowing of Soup of Beef and Radish and color of Chige of Beef and Soybean Paste. Overall acceptability scores of chilled stored foods in the first and third day were 6.40:t0.83 and 6.07 :to.46 in Miyuck-gook, 6.93 ${\pm}$0.80 and 6.27${\pm}$1.16 in Soup of beef and radish, and 6.40${\pm}$1.40 and 6.07${\pm}$1.44 in Chige of beef and soybean paste, respectively.

• Korean journal of food and cookery science
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• v.18 no.1
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• pp.20-29
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• 2002

Standard recipes of various fish dishes for cook/chill system were developed to provide foodservice managers in kindergarten with more effective management system. Three kinds of fish dishes, Broiled Mackerel, Flounder Stew and Squid Bulgogi were selected as menu items in this study, and the standard recipes for these fish dishes were developed through the sensory evaluation, and microbiological analyses were performed to assure the quality of fish dishes. The microbial counts of the fish dishes which were chilled at 0∼3$^{\circ}C$ and stored for 10 days in refrigerator were as follows : Aerobic bacteria were not detected in Broiled Mackerel; however, those in Flounder Stew were 2.92${\pm}$0.01∼3.84 ${\pm}$0.06 Log CFU/g and those in Squid Bulgogi were 3.16${\pm}$0.01∼4.80${\pm}$0.02 Log CFU/g. Coliform bacteria were not detected in any fish dishes. All the sensory characteristics showed no significant differences between the first and third day of storage, except the feeling after swallowing of Flounder Stew. Overall acceptability scores of chilled stored foods in the first and third day were 6.87${\pm}$0.99 and 6.40${\pm}$1.40 in Broiled Mackerel, 6.87${\pm}$0.35 and 6.73${\pm}$1.10 in Flounder Stew, 6.13${\pm}$0.99 and 6.07 ${\pm}$0.80 in Squid Bulgogi, respectively.

• Food Science of Animal Resources
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• v.18 no.4
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• pp.339-347
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• 1998

The effects of conjugated linoleic acid (CLA) in egg yolk on fatty acid composition and lipid oxidation during chilled storage (4$^{\circ}C$) were investigated. CLA was synthesized according to the method of alkali isomerization using safflower seed oil (SSO). A total of 250 hens (200 days of age) were fed control diet (commercial formula feed for han) or CLA-supplemented diet (1%, 2.5% and 5% CLA) or 5% SSO supplemented diet for 6 weeks, and eggs were collected for analysis of CLA, fatty acid compositons and lipid oxidation. Eggs from CLA-supplemented diets groups showed significantly (p＜0.05) higher CLA content compared to those of control group. The contents of linoleic, palmitic, and myristic acid were increased as well as CLA content by feeding a CLA-supplemented diet. However, the contents of oleic and arachidonic acids in egg yolks were decreased by dietary CLA supplementation. The pH of egg yolk increased by the levels of CLA during storage. The contents of CLA were not significantly (p＜0.05) changed during chilled storage for 28 days, whereas TBARS were significantly (p＜0.05) increased. It is suggested that lipid oxidation of egg yolk might be affected by the levels of CLA in egg yolk due to changes in fatty acid compositions.

• Food Science of Animal Resources
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• v.24 no.4
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• pp.342-348
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• 2004

To evaluate the sensory characteristics of domestic or imported chilled and frozen pork butts, six samples were purchased and investigated. Sixty panels of sensory evaluation were consisted of six groups by sex and age. In the appearance test, many panels preferred the domestic frozen butt A obtained good scores in fat color and fat attachment (p<0.001). In the age group, the 20's consumer preferred the domestic chilled pork butt of A company, whereas the 30's and 40's consumers preferred the imported frozen butt of A company. According to the results from the triangle test, the combinations of domestic frozen butt B and imported frozen butt A was the most significantly distinguished among the pairs of raw and cooked butts.

• The Korean Journal of Food And Nutrition
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• v.15 no.1
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• pp.1-6
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• 2002

This study was conducted to investigate the effects of vacuum packaging on lipid oxidation and meat color of chilled pork. During storage meats wert evaluated for TBA values, pH, blooming time and CIE L$\^$*/a$\^$*/b$\^$*/ values. The TBA values of wrapped meats increased rapidly after 7days and Those of vacuum packaged meats maintained at low level up to 30 days of storage. The pH of wrapped meats increased rapidly after 7days, while those of vacuum packaged meats increased slowly up to 30 days of storage. The bloom time of vacuum packaged meals was 30 min after opening. The CIF L$\^$*/ values of wrapped meats decreased rapidly on the 7th day, while those of vacuum packaged meats directly after opening decreased slightly up to 7days of storage and thereafter increased gradually. The CIE a$\^$*/ values of wrapped meats increased gradually up to 7days and thereafter decreased rapidly, while those of vacuum packaged meats directly after opening were lower than those of wrapped meats. The CIE a$\^$*/ values of vacuum packaged meats after 30 min in the air were higher than those of vacuum packaged meals directly after opening. The CIE b$\^$*/ values of wrapped meats increased rapidly on 4th day and thereafter decreased rapidly, while those of vacuum packaged meats directly after opening were lower than those of wrapped meats. The CIE b$\^$*/ values of vacuum packaged meats after 30 min in the air were higher than those of vacuum packaged meats directly after opening.

• Food Science and Preservation
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• v.11 no.2
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• pp.263-268
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• 2004

Two field cooling tests were conducted to evaluate the cooling characteristic of paddy with a prototype grain cooler. The first test was carried out during summer season in a steel bin with 180.3ton of paddy at Sunchon. And the second test was carried out during harvesting season in a steel bin with 272.2ton of paddy at Ulsan. At the first test, initial paddy temperature of 23.6$^{\circ}C$ was dropped to 14$^{\circ}C$, and initial moisture content of 19.9% was dropped to 19.3% after 52.5 hours of cooling. At the second test, initial paddy temperature of 16.1$^{\circ}C$ dropped to 5.5$^{\circ}C$ after 78.0 hours of cooling. And, at the first test, the average air flow rates of chilled air leaving the grain cooler and penetrating the grain layer were 77.5 ㎥/min and 42.5 ㎥/min, respectively. To prevent leakage of chilled air from plenum chamber of steel bin, which was about 45% of the average air flow rates of chilled air leaving the grain cooler, a proper method was required. The average total power consumption at the first test during summer was 22.1 ㎾ with control of fan damper. At the second test, it was 17.4 ㎾ due to controlling the capacity of compressor with unloading solenoid valve and changing the flow rates of hot refrigerant gas flowing into evaporator and reheater from compressor, resulting in 27% reduction of energy consumption.

• Journal of the Korean Society of Food Science and Nutrition
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• v.30 no.6
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• pp.1152-1157
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• 2001

Two kinds of samples were prepared from the loin in the carcass with grade B2 and D, which were chilled for 24 hour after slaughter. The fresh beef in this study were obtained by chilling the loin for 1 day after wrapping them. On the other hand, the chilled beef were obtained by cutting the loin by 500 g and chilling them for 30 day after vacuum packing. The experiment was carried out to compare the palatability related with characteristics of loin with grade B2 and D and to investigate the chilling effect of the loin with grade D. In the case of fresh beef, it was found that the loin with grade B2 has better meat color, but lower pH, lactic acid content, and myoglobin content, than them of the loin with grade D. Also, the loin with grade B2 has lower tenderness due to its low hardness and chewiness, and high myofibrillar fragmentation index (MFI). Furthermore, it has high monounsaturated fatty acid/saturated fatty acid (MUFA/SFA) and ATP content, and good raw meat aroma. It also shows an excellent palatability of cooked meat, although it has low cooking loss and heat shotening. On the other hand, the loin with grade D has higher chilling effect on hardness, chewiness, MFI and MUFA/SFA, than them of the loin with grade B2. However, in the case of chilled beef, the loin with grade D shows much worse tenderness, cooked meat aroma, and palatability than them of the loin with grade B2.