• 대한안전경영과학회지
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• 제8권5호
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• pp.71-84
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• 2006

In order to apply job performance records to the master craftsman examination, which is an examination to screen the top-rated technician and task manager, the domestic industry has introduced job performance records to the written test of the master craftsman examination. Surveys on master craftsman's field capabilities and applicability are being conducted, and various qualification methods are being tested so as to give satisfaction to consumers in industrial fields. However, these methods have many problems in assessing task managers' qualifications. In order to solve these problems, this research intends to verify the appropriateness of introducing master craftsman's portfolios assessment and the suitability of application methods by conducting interviews and surveys. One big conglomerate and one mid-sized company that has more than 500 employees and covers from 주조(酒造:brewing) 또는 to providing various services to consumers were selected for this research.

• Mycobiology
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• 제38권2호
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• pp.122-127
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• 2010

Different strains of mold were screened for the production of high quality Korean traditional rice wine with anti-hypertension and good acceptability. We isolated 867 nuruk mold strains and selected 24 for further study based on measurement of amylase activity. Among them, mold No. 17 showed high ethanol production upon fermentation with Saccharomyces cerevisiae as well as anti-hypertensive properties. The No. 17 strain was therefore selected as the functional mold and later identified as Rhizopus stolonifer based on molecular biological characteristics. Optimal fermentation conditions for the brewing of anti-hypertensive traditional rice wine comprised the addition of R. stolonifer No. 17 koji at a concentration of 35 sp/g and a fermentation period of 10 days at $25^{\circ}C$ using S. cerevisiae.

• 한국식품영양학회지
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• 제22권1호
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• pp.86-91
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• 2009

To develop a new traditional Gugija tagju, various koji were prepared using several starch sources along with Aspergillus awamori var. kawachi, and then their effects on the quality of the tagju were investigated. Ethanol contents(11.1${\sim}$13.8%) were not significantly different among the Gugija tagju made from the various types of koji, whereas the tagju made using non-glutinous rice koji had the best total acceptability. The addition of 1% Gugija extracts into the mash increased its total acceptability and anti-hypertensive angiotensin I-converting inhibitory activity, and the optimal fermentation period for brewing the Gugija tagju was 10 days.

• 벤처혁신연구
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• 제1권2호
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• pp.123-139
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• 2018

본 연구와 실험은 막걸리의 양조 과정에서 1단계·2단계 담금으로 밑술을 만들고, 3단계 담금으로 막걸리를 만들고, 누룩의 물리·화학적 특성에 따른 막걸리의 최적 조건을 위하여 설정하였으며, 물리·화학적 특성의 변화를 확인하고 누룩 입력 시점을 기준으로 전통적 막걸리의 특성 검사를 시행하였다. 1단계·2단계 밑술의 물리·화학적 특성을 시험한 결과, pH와 산도는 step-1 담금으로 배양 한 날에 크게 감소하였고 배양 2 일까지는 추세가 지속되었다. 또한 아로마, 산도, 단맛 및 입안에서의 감촉 정도를 분석하기 위하여 관능검사를 실시하였으며, 그 결과로서 아로마는 M3단계에서 4.47로 가장 높았고, 산도는 M3단계에서 3.65로 가장 높았으며, 단맛은 M1단계에서 3.88, 입안에서의 감촉으로는 M1단계에서 3.59으로 가장 높았으며. 아로마와 맛을 포함한 전반적인 선호도는 M3에서 3.71로 가장 높게 나타났다.

• 동아시아식생활학회지
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• 제26권2호
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• pp.125-140
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• 2016

We analyzed the cultural characteristics of isolated brewing fungi for developing fermentation starters. In a previous study, we collected 87 domestic nuruk, from which 481 fungi strains were isolated and 11 were selected showing improved productivity. After culturing these 11 fungi strains in several types of media, temperatures, carbon and nitrogen sources, Rhizopus sp. grew well in MEA, ME20S, PDA medium while Aspergillus sp. grew well in ME20S and YES. Both Rhizopus sp. and Aspergillus sp. survived well at optimal growth temperatures of 30 and $37^{\circ}C$. Rhizopus sp. utilized lactose, glucose and peptone sources while Aspergillus sp. utilized glucose, mannose, fructose and yeast extract sources. ${\alpha}-Amylase$ activity was excellent in L. ramosa CN044, R. oryzae 82-7(MEB), R. oryzae CN174 and A. oryzae 58-11(WEB) culture extracts. This study suggests that R. delemar 26-4, 58-8 and A. oryzae 78-5, 37-7 might be appropriate fungi strains for fermentation starters based on development of large fungi bodies and their good enzyme activities.

• 동아시아식생활학회지
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• 제27권3호
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• pp.348-363
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• 2017

We analyzed the mixed culture characteristics of isolated brewing fungi obtained from Korean traditional nuruk for their development as fermentation starters. In a previous study, we selected appropriate fungi strains based on their large fungi bodies and strong enzyme activities. These fungi strains were mixed cultured under various combination of ratios, pHs and temperatures. As a result, total acidities of R. delemar mixed culture media were higher than those of A. oryzae cultured at $20^{\circ}C$ and $37^{\circ}C$. The pHs of A. luchuensis 34-1 and A. oryzae 37-7 as well as R. delemar 58-8 and A. oryzae 37-7 mixed culture media gradually increased with the culture period. On the contrary, total acidities of the mixed culture media gradually decreased. ${\alpha}-Amylase$ activities of R. delemar 26-4 and R. oryzae 82-7 mixed culture media were strong at $20^{\circ}C$ and pH 4, glucoamylase activities of R. delemar 58-8 and A. oryzae 37-7 were strong at $37^{\circ}C$, pH 3 and 1:2 ratio, and acidic protease activities of R. delemar 26-4 and A. oryzae 78-5 were strong at $20^{\circ}C$, pH 4 and 1:4 ratio. This study provides the optimal mixed culture conditions for fermentation starters based on changes in pH and total acidity, favorable enzyme activities, and fungi varieties.

• 한국미생물·생명공학회지
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• 제41권2호
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• pp.168-175
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• 2013

본 연구는 발효조건을 달리한 현미 막걸리의 술덧성분 변화를 조사하였다. 서로 다른 발효제와 발효온도에 따른 알코올의 차이는 $30^{\circ}C$ 발효가 $20^{\circ}C$보다 알코올 도수가 평균 2% 정도 높은 것으로 나타났다. 당화력 차이는 발효 초기부터 $20^{\circ}C$보다 $30^{\circ}C$ 발효액의 당도가 높게 나타난 것으로 보아 알코올 도수에도 영향을 미치며, pH는 발효 4일까지는 서서히 감소하였고 그 이후, 변화의 폭은 크지 않았다. 적정산도는 발효가 끝날 때까지 지속적으로 증가하였으며, $20^{\circ}C$ AK의 적정산도가 가장 높게(0.57%) 나타났고, $30^{\circ}C$ 발효 술덧에서는 0.66%로 산패 가능성은 없었다. 색도 중 L 값과 a 값은 발효초기의 모든 술덧에 비해 발효 종료시점에 조금 낮아지며, b 값은 발효가 진행됨에 따라 꾸준히 상승하였다. 발효 술덧의 유기산은 총 9종이 검출되었으며, 그 중 citric acid 함량이 가장 높게 나타났다. Lactic acid는 오히려 $20^{\circ}C$ 발효술덧에서 더 많이 검출된 것으로 보아 발효온도에 따라 생성된 유기산이 차이가 있었다. 유리아미노산 함량은 발효제 종류 및 발효온도에 따라 크게 차이가 있었고, 유리아미노산은 $20^{\circ}C$보다 $30^{\circ}C$ 발효 술덧에 많이 있었다. 이상의 결과를 살펴보면, $30^{\circ}C$에서 제조한 현미 막걸리가 더욱 우수한 품질을 가지며, 누룩 종류 및 발효온도에 따라서 현미 막걸리의 주질이 결정된다. 향후, 농가형 흑초 제조에 적합한 현미 막걸리의 술덧 제조가 가장 중요하다고 여겨진다.

• Journal of Microbiology and Biotechnology
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• 제23권6호
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• pp.794-801
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• 2013

This paper reports the production and characterization of crude xylanase from the newly isolated Humicola sp. Ly01. The highest (41.8 U/ml) production of the crude xylanase was obtained under the optimized conditions (w/v): 0.5% wheat bran, 0.2% $KH_2PO_4$, and 0.5% peptone; initial pH 7.0; incubation time 72 h; $30^{\circ}C$; and 150 rpm. A considerable amount of the crude xylanase was induced using hulless barley bran or soybean meal as the carbon source, but a small amount of the enzyme was produced when supplementary urea was used as the nitrogen source to wheat bran. The crude xylanase showed apparent optimal cellulase-free xylanase activity at $60^{\circ}C$ and pH 6.0, more than 71.8% of the maximum xylanase activity in 3.0-30.0% (v/v) ethanol and more than 82.3% of the initial xylanase activity after incubation in 3.0-30.0% (v/v) ethanol at $30^{\circ}C$ for 2 h. The crude xylanase was moderately resistant to both acid and neutral protease digestion, and released 7.9 and 10.9 ${\mu}mol/ml$ reducing sugar from xylan in the simulated gastric and intestinal fluids, respectively. The xylooligosaccharides were the main products of the hydrolysis of xylan by the crude xylanase. These properties suggested the potential of the crude enzyme for being applied in the animal feed industry, xylooligosaccharides production, and high-alcohol conditions such as ethanol production and brewing.

• Journal of Applied Biological Chemistry
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• 제65권4호
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• pp.421-427
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• 2022

본 연구에서는 제주 타타리메밀을 이용하여 침출 온도(60, 80, 100 ℃)에 따라 이화학적 특성 및 생리활성도를 비교하여 제주 타타리메밀의 최적의 침출조건을 설정하고자 하였다. 제주 타타리메밀의 침출 온도가 높을수록 갈변도가 증가함(60 ℃: 0.05, 80 ℃: 0.09, 100 ℃: 0.10)을 확인하였으나 pH에는 유의적 변화가 없었다. 총폴리페놀 함량은 60 ℃ 침출보다 80 ℃에서 그 함량이 높았으나, 오히려 100 ℃ 침출 온도에서는 유의적으로 감소하였다(60 ℃: 17.06 mg GA/g, 80 ℃: 20.09 mg GA/g, 100 ℃: 18.45 mg GA/g). 플라보노이드(60 ℃: 18.95 mg catechin/g, 80 ℃: 20.80 mg catechin/g, 100 ℃: 25.07 mg catechin/g) 및 Rutin(60 ℃: 0.08 mg/g, 80 ℃: 0.08 mg/g, 100 ℃: 0.09 mg/g)은 온도가 증가할수록 그 함량이 증가하였다. DPPH 라디칼 소거 활성(60 ℃: 41.88%, 80 ℃: 46.01%, 100 ℃: 46.80%) 및 tyrosinase 저해 활성(60 ℃: 9.38%, 80 ℃: 22.94%, 100 ℃: 28.17%) 또한 온도가 증가함에 따라 유의적으로 높게 나타났으나 DPPH 라디칼 소거활성의 경우 80와 100℃의 유의적인 차이는 없었다. 마우스 대식세포(Raw264.7)에 제주 타타리메밀 침출액을처치하여 세포 독성 실험을 수행한 결과 100 ℃ 추출물의 100, 200 ㎍/mL 처치는 생존율을 유의적으로 증가시켰고 그 외 조건에서는 유의적 차이가 없어 추후 항염증 효과를 측정하기 위한 기초데이터로 사용되어 질 것이다. 본 연구에서는 대부분의 생리활성물질과 항산화능, tyrosinase 저해정도가 온도가 높을수록 증가하는 것으로 나타났으나, 항산화능을 가진것으로 알려진 폴리페놀의 함량이 100 ℃ 침출 온도 에서는 유의적으로 감소하였던 점, 그리고 타 연구들에서 지나치게 높은 농도에서의 침출은 종합적 기호도가 낮아졌다는 점을 감안할 때 최적의 침출조건은 80 ℃인 것으로 예측되었다.