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신선편이 파프리카의 미생물 생장에 있어서 이산화염소수와 푸마르산 병합처리의 효과
정승훈 ( Seung Hun Jung ),박승종 ( Seung Jong Park ),천호현 ( Ho Hyun Chun ),송경빈 ( Kyung Bin Song ) 한국응용생명화학회(구 한국농화학회) 2014 Journal of Applied Biological Chemistry (J. Appl. Vol.57 No.1
신선편이 파프리카의 이산화염소수와 푸마르산의 병합 살균 처리의 효과와 그에 따른 미생물의 생장 변화를 분석하였다. 병합처리를 통해 파프리카에서의 총 호기성 세균과 접종된 L.monocytogenes는 대조구에 비해 각각 0.82, 1.21 log CFU/g의감균 효과를 얻었다. 또한 저장 10일 후에는 미생물 수가 1.21,2.10 log CFU/g 감소하였다. 파프리카 시료를 10일간 저장하면서 미생물 수를 측정한 결과를 Gompertz model을 이용하여 최대성장속도와 유도기를 구함으로써 미생물의 생장 예측 모델에 적용하였다. 모델 식의 적합성 평가를 위해 R2, Af , Bf , 등의 값을 계산한 결과, 모두 1에 가까운 결과가 나와 측정값과 예측된 값 사이의 적합성이 뛰어났다. 따라서 본 연구결과는 이산화염소수와 푸마르산의 병합처리는 신선편이 파프리카에 오염된 미생물 수를 감소시킬 뿐 만 아니라, 미생물의 최대성장속도를 감소시키고 유도기를 증가시킴으로써 미생물 생육을 제어할 수 있음을 보여준다. The effects of combined treatment of aqueous chlorine dioxide (ClO2) and fumaric acid on the microbial growth in freshcut paprika were investigated. After the combined treatment, the populations of total aerobic bacteria and inoculated Listeria monocytogenes in the paprika sample were reduced by 0.82 and 1.21 log CFU/g, respectively, compared to those of the control. In addition, after 10 d of storage at 10℃, the populations were decreased by 1.21 and 2.10 log CFU/g, respectively. The predictive model for the populations of total aerobic bacteria and L. monocytogenes in the paprika was applied during storage. The prediction equation using Gompertz model was appropriate, based on the statistical analysis such as accuracy factor and bias factor. These results suggest that the combined treatment of aqueous ClO2 and fumaric acid can be an effective technology for microbial decontamination and it can improve microbial safety by decreasing maximum growth rate and increasing lag time of bacteria in the fresh-cut paprika.
기체투과도가 다른 포장재로 포장한 ‘엘리오트’ 블루베리와 ‘설향’ 딸기의 냉장 저장 중 품질 변화
정승훈(Seung Hun Jung),강지훈(Ji Hoon Kang),박승종(Seung Jong Park),성기현(Ki Hyun Seong),송경빈(Kyung Bin Song) 한국식품영양과학회 2014 한국식품영양과학회지 Vol.43 No.6
블루베리 및 딸기의 품질유지를 위한 MAP의 활용 가능성을 확인하고자 비가열 병합 처리 세척과정을 거친 ‘엘리오트’ 블루베리와 ‘설향’ 딸기 시료를 기체투과도가 다른 polyolefin film(6,000 mL O2/m2·24 hr·atm at 24°C)과 PA/PA/PE film(60 mL O2/m2·24 hr·atm at 24°C)에 각각 포장한 후 4°C에 저장하면서 품질 변화를 측정하였다. 수확 후 블루베리와 딸기에 병합 세척처리를 한 결과, 총 호기성균은 각각 2.50, 1.97 log CFU/g, 효모 및 곰팡이에서는 각각 1.95, 2.18 log CFU/g의 감균 효과를 얻어 우수한 살균 효과를 나타내었다. 또한 PA/PA/PE film 포장에 의한 낮은 기체투과도로 인한 높은 이산화탄소 농도 환경에서 미생물의 생육이 저장 중 억제되는 것을 확인하였고, 중량 감소율에 있어서도 높은 기체투과도를 갖는 polyolefin film으로 포장한 처리구보다 낮은 감소율을 보여, 소포장된 블루베리와 딸기의 경우 기체투과도가 낮은 포장재를 이용하는 것이 효율적인 것으로 나타났다. 따라서 본 연구 결과, 수확 후 블루베리 및 딸기의 적절한 기체 조성을 위한 포장재의 선택은 품질 유지 및 유통기한 증대에 도움을 줄 것으로 판단된다. Blueberries and strawberries are highly perishable and easily contaminated with microorganisms. To maintain the quality of these commodities during refrigerated storage, the effects of two packaging materials as well as passive modified atmosphere packaging on the quality of blueberries and strawberries were investigated. The harvested blueberries and strawberries were first treated with combined non-thermal treatment of aqueous chlorine dioxide and fumaric acid, followed by packaging with polyolefin film (6,000 mL O2/m2?24 hr?atm at 24°C) and polyamide/polyamide/ polyethylene film (PA/PA/PE, 60 mL O2/m2?24 hr?atm at 24°C), respectively. After combined sanitizer treatment, the populations of total aerobic bacteria in blueberries and strawberries were reduced by 2.50 and 1.97 log CFU/g while those of yeast and molds were reduced by 1.95 and 2.18 log CFU/g, respectively, compared with the control. In particular, microbial growth in these samples packed with PA/PA/PE film was reduced during refrigerated storage. In addition, the blueberries and strawberries packed with PA/PA/PE film underwent lower weight loss than those packed with polyolefin film during storage. These results suggest that appropriate packaging with proper gas permeability is necessary to maintain the quality of blueberries and strawberries during refrigerated storage.
자동차용 연료전지 시스템의 가습모델과 열/물균형 유지방법
정승훈(Jung, Seung-Hun),윤석호(Yoon, Seok-Ho),김민수(Kim, Min-Soo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
A PEMFC system model for FCEV was constructed and simulated numerically to examine the heat/water flow of the system and air/fuel humidification process for various operation conditions (ambient pressure /temperature/humidity, operating temperature, power load). We modeled PEMFC stack which can generate maximum electricity of about 80 kW. This stack consists of 400 unit cells and each unit cell has 250cm² reacting area. Uniform current density and uniform operating voltage per each cell was assumed. The results show the flow characteristics of heat and water at each component of PEMFC system in macro-scale. The capacity shortage of the radiator occurred when the ambient was hot (over;40?C) and power level was high (over 50 kW). In spite of some heat release by evaporation of water in stack, heat unbalance reached to 20kW approximately in such a severe operating condition. This heat unbalance could be recovered by auxiliary radiators or high speed cooling fan with additional cost. In cold environment, the capacity of radiator exceeded the net heat generation to be released, which may cause a problem to drop the operating temperature of stack. We dealt with this problem by regulating mass flow rate of coolant and radiator fan speed. Finally, water balance was not easily broken when we retrieved condensed and/or unused water.
수확 후 블루베리, 복분자, 오디의 냉동 전처리를 위한 세척시스템 확립
박승종 ( Seung Jong Park ),정승훈 ( Seung Hun Jung ),박종태 ( Jong Tae Park ),김하윤 ( Ha Yun Kim ),송경빈 ( Kyung Bin Song ) 한국응용생명화학회(구 한국농화학회) 2014 Journal of Applied Biological Chemistry (J. Appl. Vol.57 No.2
To establish the pre-freezing treatment and to secure microbial safety of blueberry, Korean raspberry, and mulberry, the effects of chemical sanitizers on the populations of microorganisms in the berries were examined. Among the treatments, the combined treatment of 50 ppm aqueous chlorine dioxide and 0.1% fumaric acid reduced most the populations of total aerobic bacteria in the blueberry, Korean raspberry, and mulberry by 2.56, 2.26, and 2.56 log CFU/g, respectively, compared to the control. The populations of yeast and mold in the blueberry, Korean raspberry, and mulberry by the combined treatment were also reduced by 2.24, 2.08, and 1.49 log CFU/g, respectively. These results suggest that the combined treatment can be useful for reducing the microbial contamination and maintaining the quality of frozen berries.