• Research in Plant Disease
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• v.20 no.2
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• pp.129-131
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• 2014

In February 2014, gray mold rotting symptoms were observed in carrots in cold storage at Gangneung, Gangwon province, Korea. The typical symptom of gray mold rot showed abundant blackish gray mycelia and conidia was observed on the infected root. The pathogen was isolated from infected root and cultured on PDA for further fungal morphological observation and confirming its pathogenicity according to Koch's postulates. Results of morphological data, pathogenicity test and rDNA internal transcribed spacer (ITS 1 and 4) sequence showed that the postharvest gray mold rot of carrot was caused by Botyrtis cinerea. This is the first report of postharvest gray mold rot on carrot in Korea.

• Korean Journal Plant Pathology
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• v.14 no.5
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• pp.531-535
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• 1998

This study was conducted to test the effect of chitosan, grape fruit seed extracts(GFSE) and sodium hypochloride gas on the control of mycotoxin producing pathogens occurred kin postharvest grains. Among the treatments, sodium hypochloride gas showed the highest control effect on wheat, soybean and corn see maintained in natural conditions after postharvest and GFSE had a little control effect, but chitosan treatment had no effect. Sodium hypochloride gas exhibited the strongest control effect on the major mycotoxin producing pathogens such as Penicillium spp. Aspergillus spp. and Fusarium spp., whereas GFSE had a little control effect. Sodium hypochloride gas appeared to be effective when the grains were treated with this gas more than 24 hours.

• Mycobiology
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• v.42 no.4
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• pp.409-411
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• 2014

In March 2014, a kohlrabi stem rot sample was collected from the cold storage room of Daegwallyong Horticultural Cooperative, Korea. White and fuzzy mycelial growth was observed on the stem, symptomatic of stem rot disease. The pathogen was isolated from the infected stem and cultured on potato dextrose agar for further fungal morphological observation and to confirm its pathogenicity, according to Koch's postulates. Morphological data, pathogenicity test results, and rDNA sequences of internal transcribed spacer regions (ITS 1 and 4) showed that the postharvest stem rot of kohlrabi was caused by Sclerotinia sclerotiorum. This is the first report of postharvest stem rot of kohlrabi in Korea.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2003.10a
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• pp.41-45
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• 2003

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.79-79
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• 2020

본 연구는 새싹인삼(Panax ginseng sprout) 재배용으로 이용하기 위한 묘삼(종삼)의 장기 저온저장 시 저장온도가 묘삼의 새싹인삼으로의 생장과 품질에 미치는 영향을 조사하여 묘삼의 저장에 적합한 온도를 구명하고자 수행하였다. 2년생 묘삼을 50 ㎛ LDPE 필름에 100g씩 넣어 포장하였고 온도 0, -2, -4℃에서 10개월 동안 저장하면서 2개월 마다 꺼내어 5℃ 저장고로 이동하여 5~7일 온도순화처리를 거친 후 실험을 실시하였다. 1차 육안조사로 묘삼의 부패율과 2차 생육조사로 묘삼을 재식 후 새싹인삼으로 재배 후 생장 상태와 품질을 조사한 결과 저장 4개월 이후 묘삼의 생육조사 시 새싹인삼의 생장과 품질이 묘삼의 저장온도에 따라 유의적인 차이를 보였다. 즉, 저장 4개월 된 묘삼의 건전한 새싹인삼으로의 생장은 0℃ 저장 묘삼에서 58.3%, -2℃ 저장 묘삼에서 72.1%, -4℃ 저장 묘삼에서 37.2%로 조사되었고, 저장 8개월 된 묘삼은 0℃ 저장 묘삼에서 9.7%, -2℃ 저장 묘삼에서 54.3%, -4℃ 저장 묘삼에서 6.9%로 조사되었다. 특히 0℃ 저장 묘삼은 저장 2개월에 출아가 진행되었고 저장기간이 지날수록 출아된 싹이 동해의 피해를 받는 것으로 조사되었다. 묘삼의 생육특성인 엽장, 엽폭, 경장, 근장을 측정한 결과 -2℃에 저장된 묘삼의 엽폭과 경장의 길이가 유의적으로 긴 것으로 조사되어 새싹인삼 재배를 위한 묘삼의 적정 저장온도는 -2℃로 설정하였다.

• Food Science and Preservation
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• v.30 no.5
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• pp.822-832
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• 2023

This study investigates the effectiveness of CA (controlled atmosphere) containers in maintaining the freshness of exported melons. The melons were harvested on June 5, 2023, in the Yeongam area of Jeollanam-do, Korea. The CA container was loaded with melon samples packed in an export box. The temperature inside the container was set at 4℃, while the gas composition was set at 5% oxygen, 12% carbon dioxide, and 83% nintrogen. Following two weeks of simulated transportation, quality analysis was conducted at 10℃. The melons were inoculated with spore suspensions, and the decay rate was determined to investigate the effect of the gas composition inside the CA container on suppressing the occurrence of Penicillium oxalicum in melons. The results were compared with a Reefer container set at the same temperature. The samples transported in the CA container exhibited lower weight loss. The melon pulp softening, respiration rate, and ethylene production were slower using the CA container. Moreover, the decay rate during the distribution period in the CA container was lower than in the Reefer container. In contrast, the firmness of melons transported in the Reefer container decreased significantly (from 9.03N to 5.18N) immediately after transportation. The soluble solid content (SSC) of melons transported in the Reefer container also decreased rapidly. The results suggested that the CA container is the optimal export container for maintaining the freshness of melons.

• Journal of Biosystems Engineering
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• v.41 no.2
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• pp.108-115
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• 2016

Purpose: Radio frequency (RF) heating is a promising thawing method, but it frequently causes undesirable problems such as non-uniform heating. This can occur because of the food shape, component distribution, and initial temperature differences between food parts. In this study, RF heating was applied to the thawing of cylindrically shaped pork sirloin by changing the shape of electrodes and the surrounding temperature. Methods: Curved electrodes were utilized to increase the thawing uniformity of cylindrically shaped frozen meat. Pork sirloin in the shape of a half-circle column was frozen in a deep freezer at $-70^{\circ}C$ and then thawed by RF heating with flat and curved electrodes. In order to prevent fast defrosting of the food surface by heat transfer from air to the food, the temperature of the thawing chamber was varied by -5, -10, and $-20^{\circ}C$. The temperature values of the frozen pork sirloin during RF thawing were measured using fiber-optic thermo sensors. Results: After multiple applications of curved electrodes resembling the food shape, and a cooled chamber at $-20^{\circ}C$ the half-cylindrically shaped meat was thawed without surface burning, and the temperature values of each point were similarly increased. However, with the parallel electrode, the frozen meat was partially burned by RF heating and the temperature values of center were overheated. The uniform heating rate and heat transfer prevention from air to the food were crucial factors for RF thawing. In this study, these crucial factors were accomplished by using a curved electrode and lowering the chamber temperature. Conclusions: The curved shape of the electrode and the equipotential surface calculated from the modeling of the parallel capacitor showed the effect of uniform heating of cylindrically shaped frozen food. Moreover, the low chamber temperature was effective on the prevention of the surface burning during RF thawing.

• Bulletin of Food Technology
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• v.8 no.2
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• pp.150-153
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• 1995

본 내용은 필자가 지난 4월 23일부터 5월 2일까지 호주와 뉴질랜드의 Postharvest technology관련 연구기관과 대학, 업체등을 방문하고 수집한 자료를 바탕으로 적은 것으로 여기서는 뉴질랜드 원예식품연구소, 호주의 New South Wales주의 Gosford원예 연구및 기술자문센터 그리고 NSW 대학의 식품공학부에 있는 수학후 관리팀에 대하여 소개하고자 한다.

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 2007.11a
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• pp.162.2-162.2
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• 2007

• Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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• 1995.06a
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• pp.27-27
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• 1995