• Food Science and Preservation
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• v.20 no.6
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• pp.766-774
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• 2013

The effect of storage temperatures ($0^{\circ}C$and $20^{\circ}C$) and packing functional film for fruit quality were examined in 'Fuyu' persimmon. The fresh weight loss was delay more effectively by the inhibition of transpiration when functional film was used. The firmness was effectively maintained in functional film packages at low temperature ($0^{\circ}C$), which might result from the beneficial combination of $CO_2$ and $O_2$. The soluble solid contents was higher with packing of functional film at $0^{\circ}C$ than at room temperature ($20^{\circ}C$). Highest $CO_2$ production in functional film bags was observed in room temperature storage after one week and thereafter declined sharply whereas lowest in 8 weeks. $CO_2$ concentration regardless of packing slowly increased to $5.2{\mu}L{\sim}10.2mL{\cdot}kg^{-1}{\cdot}h^{-1}$ until 8 weeks of low temperature due to persimmon respiration. Hunter 'b' value changed greatly yellowness according to temperature of storage but there were no significant differences among packaging treatments. Effects of functional film and low temperature in slower softening were consistent. This results suggested that the packing functional film at low temperature resulted in the best retention of quality market.

• Journal of Food Hygiene and Safety
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• v.35 no.1
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• pp.68-74
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• 2020

This study investigated the inactivation and synergistic efficacy of combined low-temperature heating (LT) and atmospheric plasma (AP) against Escherichia coli in red pepper powder. A cocktail of two strains of E. coli (ATCC 11229, KCCM 11234) was inoculated onto red pepper powder and then treated with LT (60℃ for 5-20 min) and AP (atmospheric plasma for 5-20 min). The counts of E. coli in the red pepper powder were significantly (P<0.05) reduced with the increase in treatment time using LT and AP. The reduction of E. coli levels in red pepper powder when treated with LT alone for 5, 10, 15, and 20-min were 0.25, 1.45, 2.54, and 2.85 log₁₀ CFU/g, respectively. Also, the reduced levels of E. coli on red pepper powder when treated with AP alone for 5, 10, 15, and 20 min were 0.19, 0.32, 0.54, and 0.96 log₁₀ CFU/g, respectively. The synergistic effects were not dependent on the treatment time with AP, but were dependent on the LT treatment time. Synergistic reduction values for combined LT and AP treatment against E. coli in red pepper powder were -0.13 to 2.91 log₁₀ CFU/mL, respectively. Especially, the largest synergistic values (2.91-2.82 log₁₀ CFU/mL) of E. coli in red pepper powder were revealed by the combination of a 20-min treatment with LT and a 15-20-min treatment with AP. All sensory parameters (color, off-odor, taste, texture, and overall acceptability) were not significantly (P>0.05) different between non-treated and all combination-treated samples. Therefore, these results suggest that the combination of LT and AP can be potentially utilized in the food industry to effectively inactivate E. coli without incurring quality deterioration in red pepper powder.

• Horticultural Science & Technology
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• v.19 no.4
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• pp.515-520
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• 2001

To observe the stimulating effect of low dose ${\gamma}$ radiation on the dormancy breaking and growth, microtubers of two potato cultivars (Solanum tuberosum L. cv. Dejima and cv. Superior) were irradiated at the dose of 0.5-30 Gy. Though it varied with cultivars and storage duration, sprouting rate, plant growth and tuber yield were promoted by 2-8 Gy irradiation in microtuber of 'Dejima' stored at low temperature. On the other hand, in microtuber of 'Superior', sprouting rate was promoted by 2 and 4 Gy irradiation, and the growth and tuber yield by 4 Gy irradiation. These results suggest that low dose of ${\gamma}$ radiation could have stimulating effects on the dormancy breaking of microtuber and potato growth.

• Korean Journal of Poultry Science
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• v.17 no.2
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• pp.115-122
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• 1990

Effects of 7.5% potassium sorbate and/or 1% ascorbic acid dip on she]f-life of chicken parts stored at $4^{\circ}C$ was investigated. There was no remarkable difference in the microbial growth between 1% ascorbic acid dipped chicken parts and untreated chicken parts. Off-odor developed after 8 days storage and bacterial spoilage was occurred after 12 days storage. 7.5% potassium sorbate dip significantly retarded mesophilic and psychrotrophic counts compared with untreated, markedly reduced growth rate of Enterobacteriaceae. Fecal coliforms were not detected and bacterial spoilage was not occurred until 21 days storage. off-odor developed after 19 days storage and color was not significantly deteriorated until 21 days storage. Additional effect of 7.5% potassium sorbate and 1% ascorbic acid dip was found on retarded mesophilic, psychrotrophic and Enterobacteriaceae counts compared with 7.5% potassium sorbate dip alone. Bacterial spoilage was not occurred until 21 days storage. off-odor developed after 21 days storage and color was not significantly deteriorated until 21 dayss storage.

• Journal of the Korean Society of International Agriculture
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• v.23 no.5
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• pp.520-530
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• 2011

This study was carried out to evaluate the possibility of rice double cropping in Korea by assessing the growth and yield performance of rice cultivars transplanted at the extremely-early date. When the transplanted rice seedling was exposed to low temperature below 0℃, the survival rate decreased drastically. However, short exposure to below 0℃ one or two times did not damage transplanted rice seedling so severely. Thus, the earliest transplanting in spring would be possible when minimum temperature rises above 0℃. Compared with the conventional seedling nursery tray (CSNT), seedling rearing with the potted nursery tray was more effective for increasing leaf age and seedling dry weight during nursery period. In the first rice cropping, rice cultivation with seedlings reared in PSNT showed shorter growth duration and cumulative temperature from transplanting to heading than that with seedlings reared in CSNT. The earliest heading date on July 4 in Jinbuolbyeo was earlier by two to three days than that of Dunaebyeo. If rice has not exposed to cold damage, the earliest heading date of Jinbujolbyeo can advance to June 30 or July 1. In this case, rice harvest would be possible on August 5, enabling the rice transplanting of the second rice cropping before August 10. At transplanting time with low temperature damage rice yield were less than 400 kg/10a while rice yield exceeded 400 kg/10a at transplanting time without low temperature damage.

• Korean Journal of Food Science and Technology
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• v.31 no.5
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• pp.1392-1396
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• 1999

This work was to apply the microwave energy to HTST pasteurization of milk in order to prevent undesirable quality changes due to the fouling and overheating on the surface of heat exchanger. A continuous tubulartype microwave pasteurization system was designed using a domestic microwave oven(800w and 2,450MHz). Raw milk was HTST pasteurized$(at\;72^{circ}C\;for\;15\;sec)$ by three methods; by heating in a stainless steel tube immersed in a hot water bath(MP0), by heating in a microwave cavity to a desired temperature and then holding in a hot water bath(MP1) and by both heating and holding in a microwave cavity(MP2). The microbial quality based on the total plate count and Psychotrophic bacterial count was in the order MP0, MP2 and MP1 ; however, the quality difference was not significant(p<0.05) when the initial microbial numbers were involved in the statistical analysis. In addition, the three samples pasteurized by different methods showed the similar microbial quality based on the coliform count and phosphatase activity. The similar microbial quality of the three samples supports the potential use of microwave energy for the pasteurization of milk and other fluid food products.

• Current Research on Agriculture and Life Sciences
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• v.3
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• pp.92-98
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• 1985

The experiments were conducted to investigate the activity changes of peroxidase, existence of isoenzyme and the changes of reserved substances in tomato under subatmospheric pressure storage condition. The results obtained were as follows: 1. Soluble fraction showed the highest peroxidase activity and followed by cell wall fraction, mitochondria fraction and ribosome fraction in that order. 2. Peroxidase activity was decreased during the ripening and senescence period in tomato. Especially, peroxidase activity in tomato was higher at a room temperature ($25^{\circ}C$) than at a low temperature ($15^{\circ}C$). The decreasing inclination was similar in both treatment. The peroxidase activity was higher in 380 Torr, than in 570 Torr. 3. At least, two isoperoxidases(Soluble or solubilized) were identified from different extraction procedures. Three of four isoenzymes were recognized from a vertical slab of polyacrylamide gel electrophoresis. 4. The changes of components in tomato under SAP were generally affected by temperature and pressure. Especially, quality of tomato stored at a low temperature ($15^{\circ}C$) and SAP (380 Torr.) was best during storage.

• Food Science and Preservation
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• v.6 no.4
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• pp.380-385
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• 1999

Four cultivar of astringent persimmon(Diospyros kaki L. Cheongdobansi, Sagkoksi, Gojongsi, and Hachiya) were evaluated for quality during 160 days storage in condition of air, 12%CO$_2$+3%CO$_2$, and 16%CO$_2$+ 3%CO$_2$at 0∼2$^{\circ}C$. In the fruits of Cheongdobansi, Sagkoksi, and Gojongsi cultivar, the soluble solids content did not change significantly during storage among treatment, but in the fruits of Hachiya cultivar it decreased during storage in the codition of high CO$_2$concentration. Fruits of Cheongdobansi and Sagkoksi, which were stored in higher CO$_2$concentration, had firmer hardness, less weight loss and decay, showed greater rentention of initial peel color, maintained best qulity than air-stored fruit, but had high tannin contents. And it was necessory to remove astringency for edible fruits.

• Food Science and Preservation
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• v.13 no.2
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• pp.138-143
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• 2006

Clarified apple juice was prepared using different clarification methods including centrifugation, ultrafiltration (UF), and combined treatment (CT). Effects of clarification methods as well as other qualify parameters were investigated Clarification was clearly improved with an increase in centrifugation speed and towering temperature. Especially, lowering the temperature led to a decrease in turbidity values at 5,000 rpm. The optimum condition for centrifugation process was $5^{\circ}C$ and 10,000 rpm, respectively. UF and CT were very effective to produce clarified apple juice. The optimum condition of UF process was $45^{\circ}C$ and 150 kPa considering flux and turbidity. L*-values were increased while a*-values were decreased significantly after clarification regardless of methods (P<0.05). Vitamin C was most retained in the clarified samples using CT.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.57 no.4
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• pp.353-358
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• 2012

This study was carried out to evaluate antioxidant and anticancer activity of crudes extracts from colored corn (Zea mays. L.) among particle size with different pulverizing methods (pin mill and ultra fine pulverizer). In cytotoxicity test using extracts from the flours grounded by pin mill and ultra fine pulverizer respectively, it showed that A-549 was the highest anticancer activity among in vitro using 4 cancer cell line types (Hep-G2, A-549, HCT-116 and MCF-7). Assessing the antioxidant activities of crude extracted from different pulverizing methods was measured by trolox equivalent antioxidant capacity (TEAC) and ferric reducing antioxidant power (FRAP). Higher scanvening activity against free radical was observed in the crude extracted from small particle size flours of colored corn than in those of the big particle size.