• 한국약용작물학회:학술대회논문집
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• 2011.09a
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• pp.88-89
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• 2011

• Food Industry And Nutrition
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• v.12 no.2
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• pp.44-50
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• 2007

양파(노란색, 붉은색, 흰색)의 열수 추출물이 DNCB로 감작된 4주령 BALB/c mouse 암컷에 유도된 접촉성 피부염의 억제효과를 조사하였다. 림프절, 비장 및 흉선의 무게는 양파 투여군이 DNCB 대조군보다는 낮게 나타났다. 양파 추출물을 투여한 군에서 귀의 무게는 양파 추출물의 농도가 높을수록 감소하는 경향을 보였으며, 대조군과 비교하여 무게에 함량 변화가 있었다. 양파추출물을 1,000 mg/kg 농도로 투여하면 귀의 무게는 대조군과 유사한 수준까지 낮아졌으며, 귀의 두께는 양파추출물을 투여한 군에서 시간이 경과할수록 두께가 감소하는 경향을 나타내었다. MDA 함량은 DNCB대조군과 양파 투여군을 비교하였을 경우에, 간 조직에서 차이가 나타나지 않았으나, 염증이 발생한 귀 조직에서는 차이가 나타났으며, NO 함량은 모든 양파그룹에서 염증이 억제되어 대조군에 유사하게 측정되었다.

• 한국약용작물학회:학술대회논문집
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• 2012.05a
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• pp.195-196
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• 2012

• Food Science and Preservation
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• v.19 no.2
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• pp.229-234
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• 2012

The antioxidant substance in black onion was identified. The assays that used 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzthiazo line-6-sulphonic acid) ($ABTS^+$) radicals showed that the ethyl acetate fraction of black onion methanol extract had a higher level of radical-scavenging activity than the other fractions. Two antioxidative compounds were purified and isolated from the ethyl acetate fraction via column chromatographies of silica gel and Sephadex LH-20 using the guided DPPH radical-scavenging assay. The isolated compounds were identified as 3,4-dihydroxybenzoic acid (1) and quercetin (2) based on mass spectrometry and nuclear magnetic resonance. The isolated compounds showed a high level of DPPH and ABTS+ radical-scavenging activity. Compound 2 had a higher level of radical-scavenging activity than 1.

• Korean Journal of Plant Resources
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• v.8 no.3
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• pp.247-252
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• 1995

This study examines the effects of the planting time of mother bulb and mulching materials for the seed production of onion on the amount of seed production, and the following results are obtained : Growth, bolting rate, flowering rate, floret numbers per scape and fertilization rate are best in the case of the seed production under transparent vinyl mulching between Sept. 10 and Sept. 25, and seed yield per plant and seed yield per 10a are increased in the case of the seed production under transparent vinyl mulching between Sept. 10 and Sept. 25, so it is found that it is appropriate to plant the onion mother bulb under the transparent vinyl mulching between Sept. 10 and Sept. 25 in the southern areas of Korea.

• Food Science and Preservation
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• v.10 no.3
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• pp.267-271
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• 2003

This study was carried out to investigate the yield and storability of onions on top-dressing period. Top-dressing period was applied in February, March and March, April with liquid fertilizer and solid fertilizer of farmhouse practice during the onion growing season. The yields of onion in experimental station field and farmhouse field treated with conventional fertilization were 53.2 and 56.6MT, respectively. However, they were 58.2 and 60.8MT with application of liquid fertilizer in February and March, and 53.6 and 59.1MT with application of liquid fertilizer in March and April. Rotting rates until the end of August were lower with application of liquid fertilizer on February and March(15.8％, 28.9％), compared with application of solid fertilizer by farmhouse practice(23.6％, 41.0％), and were 20.7％ and 31.7％ by treatment of liquid fertilizer on March and April. In conclusion, treatment of liquid fertilizer on February and March decreased the rotting rate.

• Food Science and Preservation
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• v.18 no.6
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• pp.954-960
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• 2011

The antioxidant activities of the ethanol, methanol, and water extracts of black onion were investigated. The highest extraction yield (28.56%) and total polyphenol content (13.5 mg/g) were found in the water extract. The water extract also showed the highest protective effect on the RAW 264.7 cell anti-inflammatory activity, and the water and ethanol extracts showed the highest reducing power. The water extract showed higher DPPH and ABTS radical scavenging activities (65.98 and 89.69%, respectively) than the other solvent extracts (ethanol, 47.77%; methanol, 66.12%). Hence, black onion can be used as a potent natural antioxidative source.

• Food Science and Preservation
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• v.8 no.4
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• pp.356-361
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• 2001

This study was conducted to improve the storability of onion bulbs by assembly simple house storage and the reduce the rotteness caused by field open storage. Allium cepa cv. Changnyungdeago, late strain was used for the test at the storage condition of natural ventilation of levels 2, forced ventilation of levels 2, field open storage and 75mm, 100mm, and 125mm ventilating holes. Mean tamperature and relative humidity were not significantly different by ventilation conditions. Mean temperature was lower in forced ventilation than that of in natural ventilation and non-ventilation, and relative humidity was a little higher in ventilation treatment than those of the others. Weight loss of onion bulbs were 2.5%, 2.9%, 3%, 4.3% in field open storage, non ventilation, natural ventilation of levels 2 and forced ventilation of levels 2 respectively. Rotting rate in natural ventilation of levels 2 and farced ventilation of levels 2 were 27.7% and 25.4% respectively but 34.6% and 37.8% in non ventilation and field open storage. Therefore, the treatment of ventilation reduced the rotteness of storage onion bulbs. The smaller the size of a ventilating hole, the lower mean temperature was maintained. The relative humidity was some high in July, but didn’t showed significantly difference in August and September. With small size of a ventilating hole, the strong wind velocity was obtained, and wind velocity by position was weaker in the middle part than both ends. Rutting rates in 75㎜, 100㎜, and 125㎜ ventilating holes were 17.9%, 15.3% and 14.1% respectively.

• Korean Journal of Breeding Science
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• v.49 no.4
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• pp.414-419
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• 2017

Red onion cultivar 'Eumjinara' with mild taste and early maturation was developed in 2013 by the Allium vegetable crop research team, National Institute Crop Science, Rural development Administration (RDA). 'Eumjinara' was originally selected from red onion breeding line, 'IS1115', It was preliminarily selected and designated 'Mon21-31-3' and advanced yield trial was performed from 2008 to 2009. Regional yield trial test was conducted in six regions from 2010 to 2012. Foliage morphology and leaf color were similar to those of a check cultivar, 'Cheonjujeok', but its shape was comparatively broad ovate. Foliage of 'Eumjinara' lodged seven days earlier than check cultivar on May 31 and the average bulb weight ($234{\pm}49.1g/bulb$) was also higher than that of check cultivar. The new cultivar was relatively resistant to clod hardness and downy mildew infection in the field condition. Average yield of 'Eumjinara' in three-year the regional yield trials was 6,999 kg/10a. The total soluble solid contents and quercetin concentrations were $41.43{\mu}g/g$ FW and $556.11{\mu}g/g$ FW, respectively.

• The Plant Pathology Journal
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• v.17 no.3
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• pp.141-148
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• 2001

Postharvest decay of onion bulbs was examined by inspecting the commercial packages in the market or in storage. Bulb rot incidence was unexpectedly high, and onion bulbs with 1st quality grade were rotten most severely by 51%, followed by 32% for 2nd and 21% for 3rd grades. This indicates that larger bulbs had higher incidences of bulb rots. Major pathogens associated with basal and neck rots were Fusarium oxysporum and Aspergillus sp. or Botrytis allii, respectively, of which basal rot was most prevalent and damaging during storage. Among the epiphytic microorgani는 from onion plants, several Bacillus and Paenibacillus spp. and previously selected Pseudomonas putida and Trichoderma harzianum had inhibitory efficacy against bulb rot pathogens. Among these B. amyloliquefaciens BL-3, Paenibacillus polymyxa BL-4, and P. putida Cha 94 were highly inhibitory to conidial germination of F. oxysporum and B. allii. P. putida Cha 94, B. amyloliquefaciens BL-3, P. polymyxa BL-4, and T. harzianum TM were applied in the rhizoplane of onion at transplanting. Initially antagonist populations decreased rapidly during the first one month. However, among these antagonists, rhizoplane population densities of BL-3, Cha 94, and TM were consistently high thereafter, maintaining about 10$^4$-10$^{5}$ cells or spores per gram of onion root up to harvest time. The other bacterial antagonist BL-4 survived only for two months. TM was the most effective biocontrol agent against basal rot, with the number of rotten bulbs recorded at 4%, while that of the control was 16%. Cha 94 was effective for the first 20 days, but basal rot increased thereafter and had about the same control efficacy as that of BL-3 and BL-4. When the antagonists were applied to the topping areas of onion bulbs at harvest, TM was the most effective in protecting the stored onion bulbs from neck rotting. The second effective antagonist was BL-3. TM and BL-3 completely suppressed the neck rot in another test, suggesting that biocontrol of postharvest decay of onion using these microorganisms either at the time of transplanting or at harvesting may be promising.