• 한국식품위생안전성학회지
• /
• 제15권2호
• /
• pp.95-100
• /
• 2000

천연식물류인 차류(녹차, 두충), 약용식물(어성초, 백화사설초, 삼백초) 및 해조류(미역, 청각, 김) 추출물, 채소류(피망, 케일,오이, 양파) 및 과실류(토마토, 매실,자두,포도)쥬스 등을 이용하여 NDMA생성억제작용을 pH 1.2, 4.2 및 6.0의 반응용액을 이용하여 in vitro에서 확인하였다 차류 및 약용식물류에서는 NDMA생성을 촉진시키는 경향을 보였으나, 해조류 추출물은 차류 및 약용식물류 추출물과는 달리 NDMA의 생성을 다소간 억제시켰으며, 반응용액의 pH가 산성일수록, 추출물의 농도를 높일수록 NDMA생성에 대한 억제효과가 컸다. pH 1.2에서 채소류쥬스는 57.6∼99.7%, 과실류쥬스는 35.9∼99.7%, pH 4.2에서 채소류쥬스는 55.0∼97.5%, 과실류쥬스는 21.3∼96.8%의 억제효과를 보였다.

• The Plant Pathology Journal
• /
• 제17권3호
• /
• pp.141-148
• /
• 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.