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Saccharomyces cerevisiae와 Hanseniaspora uvarum 효모 혼합 발효가 증류식 소주의 휘발성 향기성분 및 관능적 품질에 미치는 영향
최규택(Kyu-Taek Choi),박춘우(Chun-Woo Park),이수현(Su-Hyun Lee),이예나(Ye-Na Lee),오지윤(Ji-Yun Oh),최준수(Jun-Su Choi),최덕영(Deokyeong Choe),이새벽(Sae-Byuk Lee) 한국식품영양과학회 2024 한국식품영양과학회지 Vol.53 No.6
본 연구는 기존에 과실주 발효 시, non-Saccharomyces 효모를 혼합 발효하여 향기성분을 증가시키는 기술을 확대하여 단독 및 혼합 발효로 제조한 탁주 술덧의 향기성분을 증가시킨 후 증류 과정을 통해 주질을 향상시킬 수 있다는 이론을 검증하고자 한 연구이다. 연구를 진행하기 전 예상한 것처럼 증류 전후로 비점이 낮은 휘발성 향기성분들의 함량이 크게 증가하였으며, 특히 혼합 발효 증류식 소주에서 과실 향을 나타내는 저분자 ester 계열의 휘발성 향기성분들의 함량이 증가하는 것이 확인되었다. 관능검사 결과, 휘발성 향기성분이 증가한 HU S6 혼합 발효구에서 SC NY21을 사용한 다른 증류식 소주들과 비교하여 유의적으로 큰 차이를 나타내지는 않았지만, 조금 더 높은 향미 점수를 얻은 것을 고려할 때, 향후 non-Saccharomyces 효모의 혼합 발효를 통한 증류식 소주의 품질을 향상시킬 수 있는 기초연구로써 중요한 의미를 가진다고 판단된다. 또한 H. uvarum 계열 효모의 경우에는 국내에서는 식품 원료로 등재되지 않았기 때문에, 향후 산업적 이용을 위한 안전성 검증 등의 연구가 추가되어야 할 것으로 사료된다. This study increased the volatile aromatic compounds in wine through the mixed fermentation of Saccharomyces cerevisiae and non-Saccharomyces yeasts to make distilled soju. The expectation was to induce changes in the metabolites, such as volatile aromatic compounds, before the distillation process, followed by concentrating these compounds through distillation to enhance the odor properties of distilled soju. When alcohol fermentation was conducted using S. cerevisiae NY-21, both single and co-fermentation showed slightly higher total acidity, and the reducing sugar began to deplete more quickly than when using S. cerevisiae 11215. When Hanseniaspora uvarum yeast was used, the content of low molecular weight volatile aroma compounds increased, particularly esters. The sensory evaluation results indicated a higher odor score in distilled soju co-fermented with S. cerevisiae and H. uvarum S6, suggesting that the mixed fermentation technology using H. uvarum could help improve the quality of distilled soju in the future.
스트랩캐스팅한 구상흑연주철 박판의 미세조직과 기계적 성질에 관한 연구
최규택(Kyu Taek Choi),박재영(Jae Young Park),나형용(Hyung Yong Ra) 한국주조공학회 1999 한국주조공학회지 Vol.19 No.1
N/A Strip casting process, a new casting technology which makes thin strip of 0.5∼5 ㎜ thickness directly from molten metal, has been dramatically developed for past 10 years and faced commercialization in the case of STS304 strip. In this study, ductile cast iron strip which is 1.1 ㎜ thick and 100 ㎜ wide is manufactured by the twin roll strip caster. Graphite and matrix structure of the strip can be controlled through heat treatments and the mechanical properties are examined. The microstructure of the as-cast strip consists of cementite and pearlite. Especially the equiaxed crystal zone of pearlite exists in the center region of the thickness due to the characteristics of the strip casting process. Matrix structure can be transformed into fully ferrite or ferrite/pearlite mixed structures by the different graphitization heat treatments. The heat-treated strip with ferrite/pearlite matrix structure showed higher hardness and tensile strength than that with full ferrite matrix structure. (Received December 14, 1998)
최규택(Kyu Taek Choi),전재규(Jae Kyu Jeon) 대한통증학회 1989 The Korean Journal of Pain Vol.2 No.1
N/A It has been standard practice in many institutions to use a combination of a light general anesthesia and an epidural block for lower abdominal and pelvic surgery. This combination of a balanced anesthesia can provide various benefits to the patient such as less bleeding in the surgical field, the use of a lower concentration of general anesthetics, less muscle relaxant, and post operative pain management. However there are several problems associated with hemodynamics such as bradycardia and hypotension etc. In order to block the pain of the high surgical area with a lumbar epidural puncture postoperatively, a large volume of local anesthetic is required and consequently an extensive blockade of sympathetic, sensory and motor functions can occur causing motor weakness, numbness and postural hypotension. Therefore, the patient is unable to have early ambulation postoperatively. In this study, thoracic epidural catheterization was undertaken to locate the tip of the catheter exactly at the surgical level for upper abdominal surgery, and was followed by general anesthesia. Twenty-one patients scheduled for upper abdominal surgery were selected. Fifteen of them had he-patobiliary operations and the remaining 6 had gastrectomies. Thoracic epidural punctures were performed mostly at T9 - T10 (57.1%) and TS- T9. Neuromuscular blocking agents were not used in half of the cases and the, mean doses of relaxant were 3.5±1.0mg in gastrectomies, and 2.7±0.9mg in cases of hepatobiliary operation. Epidural morphine was injected 1 hour before the end of the operation for postoperative pain control. Eight patients did not require additional analgesics and the mean dose of epidural morphine was 2.2±0.9mg, and 13 cases were given 0.125% epidural bupivacaine when patients complained of pain. Their initial doses of epidural morphine were 1.9+0.4mg and the mean duration of bupivacaine was 6 hours 20 minutes+40 minutes. In conclusion, thoracic epidural analgesia is valuable to reduce postoperative pain in patients with upper abdominal surgery, However, it is not easy to maintain this balanced anesthesia with high epidural analgesia and light general anesthesia for upper abdominal surgery because of marked hemodynamic changes. Therefore, further practice will be required.
임상연구 : 신선가스유량의 변화가 흡입마취제의 흡기가스농도에 대한 호기가스농도 비율에 미치는 영향
신원정 ( Won Jung Shin ),최규택 ( Kyu Taek Choi ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.50 No.6
Background: One way to make rapid increase in alveolar anesthetic concentration includes using high fresh gas flow rates. Fresh gas flow rates should be increased to compensate the amount of uptake either. This study was performed to elucidate optimal fresh gas flow rates for rapid induction by comparison of changes of ratio of expired to inspired concentration. Methods: The study population was composed of 107 patients undergoing thyroidectomy. Patients were randomly allocated to one of three groups who received desflurane or sevoflurane or isoflurane. Each group was randomly subdivided into three groups who received one of the fresh gas flow rate: 2, 5 or 10 L/min. Inspired anesthetic concentration (Fi) and expiratory anesthetic concentration (Fe), delivered concentration (FD) were recorded. Results: With same fresh gas flow rates, there were significant differences between Fe/Fi of desflurane, sevoflurane, isoflurane. With same anesthetics, Fe/Fi of desflurane and sevoflurane were not influenced by fresh gas flow rates. But Fe/Fi of isoflurane at 2 L/min was significantly lower than 5 L/min and 10 L/min. Fi/FD of desflurane at 10 L/min did not differ from sevoflurane. At 2 L/min and 5 L/min, Fi/FD of desflurane was highest and then sevofluane, isoflurane in that order. Conclusions: Because rates of Fe/Fi of desflurane and sevoflurane were not influenced by fresh gas flow rates, 2 L/min of fresh gas flow rates could be selected. However, considering the wash-in time in circuit, optimal choice of fresh gas flow rate for desflurane and sevoflurane could be 5 L/min, that of isoflurane be 10 L/min. (Korean J Anesthesiol 2006; 50: 629~36)
허인영 ( In Young Huh ),최규택 ( Kyu Taek Choi ),천무영 ( Moo Young Cheon ),박평환 ( Pyung Hwan Park ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.50 No.6
Cyanosis in children is most often caused by pulmonary disease, or cyanotic heart disease but is rarely caused by hematological problems such as methemoglobinemia and sulfhemoglobinemia. Abnormal hemoglobins with a reduced oxygen affinity are an exceptionally uncommon cause of cyanosis in children. Hemoglobin-M (Hb-M) is rapidly auto-oxidized into the met-form resulting in the loss of its O2-binding ability. This hemoglobinopathy is inherited in an autosomal dominant pattern and is characterized by marked cyanosis. Hb-M affects the anesthetic management because of the anomalous absorption spectrum of Hb-M in standard pulse oximetry. Sufficient O2 delivery should be maintained by keeping a high FiO2 and intermittently checking the O2 delivery state using arterial blood gas analysis. We reported our experience of the anesthetic management of a patient with hemoglobin M. (Korean J Anesthesiol 2006; 50: 723~6)