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김경탁,김성수,최희돈,홍희도,하상도,이영춘,Kim, Kyung-Tack,Kim, Sung-Soo,Choi, Hee-Don,Hong, Hee-Doo,Ha, Sang-Do,Lee, Young-Chun 한국식품과학회 1999 한국식품과학회지 Vol.31 No.2
식품공정에 있어서 비가열 살균 기술로 개발되고 있는 고전압 펄스 전기장(pulsed electric fields, PEF)을 과실주스의 품질 향상에 응용하고자 pilot-scale의 고전압 펄스 전기장 살균장치를 개발하였으며, 이것을 과실 주스의 모델로 선정한 사과주스의 대표적 오염지표균 또는 품질을 저하시키는 미생물 중 Escherichia coli, Bacillus subtilis, Rhodotorula minuta에 적용시켜 세포의 생리특성을 조사하였다. 내염성, 자외선 흡수 물질, 세포염색, 세포의 회복도, 세포의 표면구조 등을 조사함으로서 PEF의 미생물 생리특성에 대한 영향을 규명하고자 하였다. E. coli, B. subtilis, R. minuta를 40 kV/cm, 84 pulse, $10{\mu}s$ pulse duration의 PEF 조건에서 처리하여 내염성을 조사한 결과 1 log cycle 정도의 생존율 감소를 나타내었다. PEF 처리에 의한 세포 내부 성분의 유출 여부를 살펴본 자외선 흡수물질 측정결과 260 nm, 280 nm에서 모두 PEF 처리 세포가 무처리구에 비하여 현저하게 증가된 흡수물질 농도를 나타내었다. PEF 처리된 R. minuta를 세포 염색하여 관찰한 결과 세포막이 터져서 개열됨에 따라 염색시약이 세포 내, 외부로 고루 염색되어 세포 본래의 형태를 관찰할 수가 없었다. PEF 처리후 세포의 회복도는 무처리구에 비하여 E. coli와 B. subtilis가 약 5시간, R. minuta가 약 8시간 정도 지연된 lag time을 보였다. 그리고 PEF 처리후의 E. coli, B. subtilis, R. minuta는 정상적인 세포와는 달리 세포막이 상당한 손상을 입어 허물어진 상태를 관찰할 수 있었다. This study was designed to investigate effects of pulsed electric field (PEF) treatment on physiological changes of microbial cells, using domestically fabricated pilot scale PEF device. The effect of non-thermal PEF treatment on physiological characteristics of microorganisms was determined by salt resistance, the amount of UV absorbents, cell staining, recovery rate of defected cells, and changes in structure of cell membrane. Salt resistance of Escherichia coli, Bacillus subtilis and Rhodotorula minuta was examined after PEF treatment at 40 kV/cm, 84 pulse, $10{\mu}s$ pulse duration. Approximately $1\;log_{10}$ cell number of viable microorganisms was decreased by addition of salt. PEF treatment significantly increased the amount of UV absorbents at 260 and 280 nm because of leakage from damaged cell membrane by PEF treatment. Although three kinds of microorganisms treated by PEF were difficult to be observed due to their cell membrane damage, untreated cells were clearly observed by a microscope. PEF-treated R. minuta was not stained by methylene blue due to cell membrane defect. When E. coli, B. subtilis and R. minuta were cultured after PEF treatment, they showed 5, 4, and 8 hr longer lag phase, respectively, compared to control, but growth rates were not affected.
김경탁(Kyung-Tack Kim),홍희도(Hee-Do Hong),김성수(Sung-Soo Kim) 고려인삼학회 2009 Journal of Ginseng Research Vol.33 No.4
과열증기 건조처리 후 열풍 건조한 인삼의 건조율이 열풍건조만으로 건조한 인삼에 비하여 약 40%의 빠른 건조율을 나타내었다. 일반성분의 함량에 있어서 조지방, 조단백질, 조섬유 및 회분 함량의 경우 두처리구간 큰 차이가 없었다. 무기질 및 유리당 함량의 경우에 있어서도 두 처리구간 큰 차이를 나타내지 않았다. 조사포닌 함량의 경우 과열증기 처리후 열풍건조한 인삼분말의 조사포닌 함량은 5.43% 그리고 열풍건조만 한 인삼분말의 조사포닌 함량은 5.4%로 두시료간 큰 차이가 없었다. 색깔의 경우 적색도를 나타내는 a값에서 과열증기 건조 후 열풍건조 처리한 인삼분말이 열풍건조한 인삼분말에 비하여 약간 높은 결과를 나타내었다. 인삼분말의 미생물 수의 경우 과열증기 건조 후 열풍 건조한 인삼분말이 열풍건조한 인삼분말에 비하여 일반세균 및 효모곰팡이가 약 2 log 정도 감소하였고 대장균군의 경우는 약 1 log 정도 감소한 결과를 나타내었다. This research aims to develop a new drying technology using super-heated steam to reduce the time required for drying ginseng and to enhance its quality. The drying rate of ginseng powder treated with hot-air drying after drying with super-heated steam was about 40% faster than the drying rate of ginseng powder treated with hot-air drying. Minimal difference was found between hot-air drying and hot-air drying after drying with super-heated steam in the general composition of the ginseng powder, such as its crude lipid, crude protein, crude fiber, and ash. Moreover, no difference was found between hot-air drying and hot-air drying after drying with super-heated steam in terms of the ginseng powder’s mineral and free sugar contents. The crude saponin contents was 5.43% in the ginseng treated with hot-air drying and 5.4% in the ginseng treated with hot-air drying after drying with super-heated steam. The ginseng powder that was treated with hot-air drying after drying with super-heated steam had a slightly higher redness compared to the ginseng powder that was treated with hot-air drying alone. The number of microorganisms of the ginseng powder treated with hotair drying after drying with super-heated steam showed a reduction of one log cycle in the total bacteria and two log cycles in the yeast molds compared to the ginseng powder treated with hot-air drying alone.
김경탁(Kyung Tack Kim),석호문(Ho Moon Seog),김성수(Sung Soo Kim),홍희도(Hee Do Hong),이영택(Young Tack Lee),김정곤(Jung Gon Kim) 한국응용생명화학회 1995 Applied Biological Chemistry (Appl Biol Chem) Vol.38 No.5
Chemical composition of barley leaves of four varieties (Olbori, Suwon 298, Suwon 311 and Milyang 60) grown under the same environmental conditions at the same location was investigated. Barley leaf samples were collected on two weeks before heading period. The barley leaves contained 25∼29% crude protein, 9.3∼9.9% crude lipid, 9.3∼11.2% ash, 1.3∼1.8% β-glucan on dry matter basis. Chlorophyll contents of Olbori, Suwon 298, Suwon 311 and Milyang 60 were 951 ㎎%, 885 ㎎%, 866 ㎎%, 826 ㎎%, respectively. Mineral contents of barley leaves were not significantly different each other and potassium content was found to be the highest among all the minerals observed. Vitamin C contents of Olbori, Suwon 298, Suwon 311 and Milyang 60 were 328 ㎎%, 266 ㎎%. 278 ㎎% and 269 ㎎%, respectively. Free sugar contents of barley leaves were somewhat different and the glucose content was the highest among the free sugars, ranging from 5.70% to 8.35%. Besides glucose, fructose, sucrose and raffinose contents were also relatively higher than the other free sugars. In other oligosaccharides, 1-kestose(GF₂) content was between 0.26% and 0.39% and a slight amount of 1-nystose(GF₃) was also detected. Although aspartic acid, glutamic acid and serine were relatively higher content than the other free amino acids, the values were not consistent in different varieties.