• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.22 no.3
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• pp.143-154
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• 2016

The purpose of this study was investigated the quality changes before and after harvesting, storage and, processing of onion. Experiments were carried out to compare the effect on the characteristics of the postharvest from preharvest factors using onion. This experiment had identified the characteristics of harvested onions after cultivating with several preharvest factors such as the light and water conditions. These tests were conducted in an onion growth in the field, storage, and processing of fresh-cut during a laboratory periods of 2 years. In first year, onion cultivars ('Kars' and 'Pop') were produced under stable or unstable environment conditions, these onions were stored at low temperature(0?). Measurement was evaluated by the growth amount after harvesting, and the fresh weight loss and respiration rate during storage. According to different culture conditions and storage temperatures, it was investigated the properties of the fresh-cut onion. Growth of onion was varied depending on the cultivars and culture conditions. The amount of growth on 'Kars' and 'Pop' onions were decreased by excessive soil water conditions with shading. These influences were found the morphological differences resulting for the cell tissue of onion being rough and large. Onion cultivated in excessive soil water with shading affected the degree of its respiration rate and fresh weight loss during storage. Ones in excessive soil water with shading were higher than the control in fresh weight loss and respiration rate, respectively. However fresh-cut onion could not investigated to clarify the difference due to effects of cultivation condition and storage temperature on some measure items such as electrolyte leakage and microbial number change. There was a change of only electrolyte leakage depending on the storage temperature, rather than cultivated conditions before harvesting factor. The results showed that the onion grown on in the good environment was represented to a good quality produce even after harvesting.

• Korean Journal of Food Science and Technology
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• v.48 no.5
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• pp.486-491
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• 2016

Efficacy of dielectric barrier discharge-cold plasma treatment (DBD-CPT) for microbial decontamination of onion powder was evaluated. Onion powder, inoculated with Escherichia coli O157:H7, Salmonella Enteritidis, or Listeria monocytogenes, was treated with helium DBD-CPT. DBD-CPT (9 kV, 20 min) inhibited E. coli O157:H7, S. Enteritidis, and L. monocytogenes by $1.4{\pm}0.5$, $2.3{\pm}0.3$, and $1.2{\pm}0.0log\;CFU/cm^2$, respectively. The inactivation levels of E. coli O157:H7, S. Enteritidis and L. monocytogenes increased by $2.2{\pm}0.1$, $2.5{\pm}0.1$ and $1.9{\pm}0.3log\;CFU/cm^2$, respectively, as water activity increased from 0.4 to 0.8, and increased by $2.3{\pm}0.4$, $2.1{\pm}0.1$ and $1.6{\pm}0.1log\;CFU/cm^2$, respectively, as the particle size increased from 0.3 to $1.0cm^2$. Neither the ascorbic acid and quercetin concentrations nor the color of onion powder was changed by DBD-CPT (p>0.05). These results demonstrate the potential for application of DBD-CPT in improving microbiological safety of onion powder while preserving the physicochemical properties.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.51 no.5
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• pp.401-407
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• 2006

This study was conducted to investigate the effect of onion cultivation under paddy and upland condition on the yield and storage of onion bulbs. In comparison of soil conditions, nitrogen, phosphate, potassium content and average temperature in upland condition were higher than those of paddy condition, but calcium, magnesium, sodium and water content in paddy condition were higher than those of upland condition. The growth of aerial part was better in upland cultivated condition. It showed that bulb formation in paddy cultivated condition was faster during in early growth stage, but was slower during in late growth stage. Average bulb size and weight were higher in upland cultivated condition, but dry weight per 100 g fresh weight and bulb hardness were higher in paddy cultivated condition. Sugar contents, inorganic compounds, nitrogen, phosphate and potassium content of onion were higher in upland cultivated condition, but calcium, magnesium and sodium content of onion were higher in paddy cultivated condition. In distribution of onion bulb size, most of large sized onions were produced in upland cultivated condition. Average bulb production for seed harvesting were $63{\sim}70%$ higher in paddy cultivated condition than that of upland cultivated condition. The rotted rate of onion was about $27.2{\sim}34.6%$ in paddy, $37.5{\sim}51.4%$ in upland cultivated condition respectively, showed favorable result as the difference of $8.7{\sim}24.2%$ in paddy cultivated condition.

• Korean journal of food and cookery science
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• v.17 no.3
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• pp.218-223
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• 2001

This study was conducted to evaluate the functional properties of onion, rosemary and thyme extracts which are the ingredients of onion Kimchi. Onion extract showed a significant difference in antioxidative effect based on peroxide value and thiocyanate method. Antioxidative activity of rosemary extract was similar to those of BHA and BHT. but thyme extract did not show any antioxidative effect.. Onion, rosemary, and thyme extracts showed antimicrobial activities against gram positive bacteria but onion and thyme extracts did not against E. coli, Candida, and molds. Rosemary extract demonstrated a strong activity against L. plantarum which is a major lactobacillus in Kimchi fermentation, and Micrococcus luteus. Onion, rosemary, and thyme extracts showed an effect or hangover relief effect by lowering the alcohol concentration of blood in rat. Blood pressure of the male spontaneous hypertensive rat was suppressed by onion extract after 3 days of feeding, but rosemary and thyme extracts were not effective for lowering blood pressure.

• Journal of Life Science
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• v.22 no.9
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• pp.1207-1213
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• 2012

Onion peels is a natural source of high-value functional ingredients produced in the onion industry without suitable processing. The objective of this study was to evaluate characteristics of onion peel extract (OPE), including its biological activities, obtained from solvent extraction in 3 times pilot scales (Lot A, B, and C). Mineral analysis showed that K was present in the largest amount (13,767.56-15,506.78 ppm), followed by Na and Ca at 8,602.44-9,796.00 ppm and 4,255.78-4,903.33 ppm, respectively. The amounts of total phenol, total flavonoid, and quercetin in the OPE were in the ranges of 598.57~626.73, 211.73~233.64, and 93.78~107.29 mg/g, respectively. The biological activities such as antioxidant and effects of fibrinolysis increased in parallel with the concentration of OPE. The $IC_{50}$ value of DPPH radical scavenging activity was in the range of 517.58~557.32 ppm in the OPE. The $IC_{50}$ value for superoxide dismutase (SOD)-like activity was in the range of 11,900.91~12,690.35 ppm. A clear zone of OPE (20,000 ppm) in fibrinolysis test was three times higher than the plasmin as a reference. In conclusion, OPE could be used as a good source of antioxidants and fibrinolytic activities.

• Food Science of Animal Resources
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• v.20 no.2
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• pp.93-100
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• 2000

Effects of onion peel (OP) components (quercetin and rutin) in press ham on TBARS, pH, redness (a*) and flavor (panel test) were investigated during cold storage. TBARS in OP samples of high concentration was significantly (P〈0.05) lower than control during cold storage. This result suggests that OP components have an antioxidant activity in press ham. Also, redness of OP samples was significantly (P〈0.05) higher than control after three weeks of cold storage. Cured ham redness could be improved through lower pH of OP samples compared to that of control. However, flavor score of OP samples was not significantly (P〉0.05) different with control during cold storage. It could be possible that OP components plays role as an antioxidant without any negative effects on plavor of press ham.

• Journal of Life Science
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• v.20 no.11
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• pp.1729-1737
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• 2010

This study was conducted to establish the optimal medium condition for the animal probiotic Lactobacillus plantarum by using onion juice. Cell yield and antioxidant activity increased in proportion to high additive levels of onion juice in medium. Onion juice, sucrose and yeast extract were selected as media ingredient factors and the effects of their mixed ratio in medium were evaluated. The full factorial design consisted of 24 experimental runs and was employed to estimate the main effects of the factors and their interactions. Significant positive effects on cell yield and antioxidant activity was shown with yeast extract and onion juice, respectively. Significant interaction was found only between sucrose and yeast extract in antioxidant activity. Finally, we selected an optimal medium that was composed of (g/l) onion juice, 600; sucrose, 15; yeast extract, 5. The efficiency of this optimum medium was estimated by using a 5 l jar fermenter. As a result, the maximum cell yield was $9.7\;{\log}_{10}$ (CFU/ml) at 12 hr. Cell yield at the end of incubation (20 hr) was $8.9\;{\log}_{10}$ (CFU/ml) and it was very similar with the predicted value, $9.0\;{\log}_{10}$ (CFU/ml). Antioxidant activity of culture was maintained at about 60~65% during all incubation time, resulting in a higher-than-predicted activity of 47.1%.

• The Korean Journal of Applied Statistics
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• v.33 no.6
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• pp.763-776
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• 2020

Onions show severe volatility in production and price because crop conditions highly depend on the weather. The government has designated onions as a sensitive agricultural product, and prepared various measures to stabilize the supply and demand. First of all, preemptive and reliable information on predicting onion production is essential to implement appropriate and effective measures. This study aims to contribute to improving the accuracy of production forecasting by developing a model to estimate the final weight of onions bulb. For the analysis, multi-level model is used to reflect the hierarchical data characteristics consisting of above-ground growth data in individual units and meteorological data in parcel units. The result shows that as the number of leaf, stem diameter, and plant height in early May increase, the bulb weight increases. The amount of precipitation as well as the number of days beyond a certain temperature inhibiting carbon assimilation have negative effects on bulb weight, However, the daily range of temperature and more precipitation near the harvest season are statistically significant as positive effects. Also, it is confirmed that the fitness and explanatory power of the model is improved by considering the interaction terms between level-1 and level-2 variables.

• Journal of the Korean Society of Food Science and Nutrition
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• v.25 no.2
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• pp.267-273
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• 1996

열풍건조 전 전처리로서 $50^{\circ}C의$ 2%(w/v)가용성 전분용액에서 20분간 침지를 한 처리구와 건조 후 분말 입자크기가 $40^{\circ}C,$ 90%RH의 저장 중 분말양파의 물리적 성질에 미치는 영향을 조사하였다. 저장 중 수분흡수는 처리구와 대조구 모두 분말양파의 입자 크기에 관계없이 저장 초기에 빠르게 이루어진 후 저장시간이 지남에 따라서 둔화되었다. 처리구가 대조구에 비하여 저장중 수분흡수가 작게 나타났다. 처리구의 경우 분말입자가 큰 -24+60 mesh의 수분흡수는 저장 6시간 후 처리구와 대조구의 덩어리 형성 정도는 각각 12.26과 60.1%이었다. 입자 크기에 다른 덩어리 형성 정도는 처리구에서 저장 1시간 후 2.28%과 23.6%로 나타났다. 겉보기 밀도에서는 처리구가 대조구에 비하여 전반적으로 높은 값을 나타내었으며 처리구의 경우 수분흡수가 0.03에서 0.12g수분/g고형분으로 늘어남에 따라서 겉보기 밀도는 입자가 큰 분말은 0.49에서 0.38g/㎤이였으며 입자가 작은 분말은 0.31에서 0.29g/㎤로 나타났다. 압축성에서는 입자 크기가 크고, 수분흡수가 많이 이루어진 분말일수록 도한 대조구가 처리구 보다 응집성질을 가지게 되므로 높은 값을 나타내었다. 이완상수에서는 입자가 큰 처리구의 경우 수분흡수가 3.0과 12.1%이루어 진 것을 비교하면 각각 2.45와 2.01로 나타났다. 이는, 수분흡수가 높아짐에 따라서 고체 성질이 줄어들게 됨으로써 이완상수값이 낮아지기 때문이다.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2003.04a
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• pp.128-131
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• 2003

양파는 묘의 소질에 따라 품질 및 수량에 미치는 영향이 매우 큰 작물로서 정식시묘의 크기가 클수록 수량이 증가하나 지나치게 크면 추대나 분구의 발생이 많아지므로 상품수량이 오히려 적어진다(서와 이, 1987, 하 등, 1998). 그러나 plug tray에 육묘한 묘는 용적이 적은 cell에 장기간 육묘되기 때문에 근권의 제한을 받아 관행의 토양육묘에 비해 묘의 생육이 저조할 뿐 아니라 연약 도장하여 기계정식에 장애를 초래하고 있다(정목, 1993). (중략)