• Korean Journal of Food Science and Technology
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• v.28 no.6
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• pp.1071-1077
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• 1996

Quality changes in citron (Citrus junos) during storage were studied to investigate the efficiency, cooling properties and the washing and storage effects of hydrocooling method. As a result of plotting the nondimensionalized citron temperature versus cooling time, its cooling rate coefficient was shown to be $-0.012\;min^4{\sim}\;-0.017\;min^4\;(R^2=0.97{\sim}0.99)$ at center, and to be $-0.033\;min^4{\sim}\;0.075\;min^4\;(R^2=0.89{\sim}0.93)$ at surface. During storage, weight loss was more affected by storage temperature than by pretreatment condition and in reached $22{\sim}23%$ after 7 weeks at $15^{\circ}C\;and\;10{\sim}11%$ after 8 weeks at $5^{\circ}C$ in all samples. However, changes in moisture contents of hydrocooled citron were shown to be about $1{\sim}2%$ after 7 weeks while that of non-treated citron was about 3% after 1 week of storage at $5^{\circ}C$. And the change of pH, acidity and soluble solid content were not significantly different between each treatments during storage $5^{\circ}C\;and\;15^{\circ}C$. Changes in Hunter L, a, and b values of hydrocooled citron were lower than those of non-treated one as the storage time increased. The respiration rate of hydrocooled citron during storage at $15^{\circ}C$ was $103.63\;mg{\cdot}CO_2/kg{\cdot}hr$, which is about 50% of that of non-treated citron.

• Food Science and Preservation
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• v.15 no.5
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• pp.635-641
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• 2008

This study was conducted to investigate the optimal sub-zero temperature for storage of two garlic cultivars, the northern ecotype 'Jaerae' and the southern ecotype 'Daeseo'. These cultivars of garlic bulbs were stored at different temperature (room temperature, $0^{\circ}C$, and $-4^{\circ}C$) conditions after predrying. Southern ecotype garlic showed higher weight loss than northern ecotype garlic. Northern ecotype garlic at $-4^{\circ}C$ exhibited less than 5% of weight loss during 10 month storage. Sprouting rate was higher in southern than in northern ecotype at room temperature storage. The value of injury by disease and insect was similar between southern ecotype and northern ecotype for 5 month storage, and then northern ecotype showed higher value of injury by disease and insect than southern ecotype. Hunter 'b' value of northern ecotype garlic was the lowest at $-4^{\circ}C$ storage. Northern ecotype garlic showed no cold injury at freezing point temperature storage. However, southern ecotype garlic had $0{\sim}5.3%$ cold injury occurrence at $-4^{\circ}C$ storage. Respiration and ethylene production exhibited the highest at room temperature storage, those had the slight increase at $0^{\circ}C$ and $-4^{\circ}C$ storages. Northern ecotype showed higher enzymatic pyruvic acid and fructan contents than those of southern ecotype. Enzymatic pyruvic acid content increased and fructan contents decreased during storage time.

• Journal of The Korean Society of Grassland and Forage Science
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• v.43 no.1
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• pp.22-27
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• 2023

This experiment was conducted to confirm the possibility of preparing Sorghum×sudangrass hybrid artificial hay using far-infrared rays in Korea. The machine used in this experiment is a drying device based on far-infrared rays, and is designed to control temperature, air flow rate, far-infrared radiation amount, and air flow speed. The Sorghum×sudangrass hybrids harvested in late September were wilted in the field for one day, and a drying test was performed on them. Conditions for drying were performed by selecting a total of 7 conditions, and each condition induced a change in radiation amount in a single condition (42%) and two steps (4 treatments) and three steps (2 treatments). The speed of the air flow in the device was fixed at 60 m/s, and the run time was changed to 30, 60, and 90 minutes. The average dry matter (DM) content was 82.84%. The DM content was 59.94 and 76.91%, respectively, in drying conditions 1 and 3, which were not suitable for hay. In terms of drying rate, it was significantly higher than 80% in the 5, 6 and 7 treatment, and power consumption was slightly high with an average of 5.7 kw/h. As for the feed value according to each drying condition, the crude protein (CP) content increased as the drying time increased, and there was no significant difference between treatments in ADF, NDF, IVDMD and TDN content. In terms of RFV, treatment 1, which is a single condition, was significantly lower than the complex condition. Through the above results, it was determined that the drying conditions 4 and 5 were the most advantageous when considering the drying speed, power consumption, and quality.