• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.1
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• pp.227-230
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• 2004

As the organic acids were added in the slurry, zeta potential of alumina was changed to negative value and IEP value was shifted from alkaline to acidic pH. In citric acid based slurry, Cu surface continuously dissolved and etching depth linearly increased. On the contrary, passivation layer was grown on Cu surface in oxalic acid based slurry. As the platen rotation speed increased, Preston coefficient decreased in both slurries. With oxalic acid based slurry, at low velocity, removal rate is high value because of high friction force compared to citric acid based slurry. As platen velocity increased, removal of Cu in citric acid based slurry became higher value than oxalic acid based slurry. Typical lubrication behaviors were observed in both slurries. As Sommerfeld number increased, COF values gradually decreased and then re-increased. It indicated that lubrication was changed to direct contact or semi-direct contact mode to hydro-lubrication mode.

• 한국식품위생안전성학회지
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• 제2권4호
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• pp.197-200
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• 1987

Nutritive value of lipids was associated with composition of fatty acid. Unvalance diet may increase the incidence of diseases. Abundant of EPA and DHA, polyunsaturated fatty acid, were contained in fishes. Studies on 10 kinds of fishes, lipid components were determined. The results were as follows; 1. The content of crude fat 18.1% were high in eels, on the contrary the content of EPA 0.1% and DHA 0.1% were low. The content of crude fat were low in mackeral and sadrine, but the content of poly unsaturated fatty acid were high. 2. Iodine value 189 was high in sadrine, consequently, this results showed the interrelation between Iodine value and the content of polyunsaturated number. 3. The content of crude fat 1.3% in flounder(sole) were low and the content of cholesterol 20 mg% were lowest in present studies.

• 한국염색가공학회지
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• 제6권3호
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• pp.67-73
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• 1994

The adsorption behaviors of acid dye and disperse dye on silk and nylon fabrics were examined, in one bath dyeing system on silk/nylon blend fabric with disperse dyes and acid dyes. In the dyeing of nylon fabric with C. I. Disperse Red 19 (Red 19) and C. I. Disperse Red 60 (Red 60), dye uptake of Red 19 was higher than that of Red 60. When silk/nylon blend fabric was dyed with Red 19 and Red 0, the dye uptake on nylon was influenced by the ffinity of the dye to the silk fabric. In the dyeing of silk/nylon with C. I. Acid Blue 80 and C. I. Acid Yellow 121, solid shade could not be obtained with the conventional method but could be obtained with the dyeing resist agent for nylon. There was not any relationship between K/S value and Munsell value, but Munsell value tended to change with the K/S value.

• 한국약용작물학회지
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• 제28권6호
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• pp.421-427
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• 2020

Morus alba, Anti-obesity, C57BL/6 Mice, Expression, Flavonoid, Gene, Mulberry Background: The seed oil of Zanthoxylum schinifolium S. et Z. (sancho) is a traditional cooking oil that has long been sold at a very high price however, depending on the method of extraction and storage, this oil becomes rancid occurs very quickly. Therefore, this study aimed to find a material that prevents rancidity and improves the storage properties of sancho oil. Methods and Results: Sancho oil was extracted using an extraction press, and acid values were compared with commercially available vegetable oils, sancho oil had a higher acid value than other vegetable oils. A very high acid value was observed in sancho oil stored for 6 months, regardless of temperature, requiring an effective storage method. The high acid value and the decrease in turbidity of sancho oil are dependent on the days of sedimentation. Treatment with sodium bicarbonate by concentration resulted in minimal changes in acid value over time. However, minor differences were detected among the treatment concentrations. Ascorbic acid was added to maximize the effect of sodium bicarbonate, and it was observed that ascorbic acid did not improve the antioxidant effect. The sodium bicarbonate and ascorbic acid mixture resulted in minimal change in acid value at temperature up to 25℃. Conclusions: Sancho oil becomes rancid very quicky and requires efficient storage techniques. Sodium bicarbonate and ascorbic acid have been proven to be useful as safe anti-racidity agents without causing harm to humans.

• 한국식품조리과학회지
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• 제19권1호
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• pp.60-64
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• 2003

콩기름과 팜유로 튀긴 유과를 2$0^{\circ}C$와 5$0^{\circ}C$에 저장하면서 분석한 결과 콩기름으로 튀겨 5$0^{\circ}C$에 저장한 유과의 산가는 2주에는 0.78mg/g에서 4주에 9.35mg/g으로 급격한 증가를 하였으나 팜유로 튀긴 유과는 저장 6주까지 변화가 없다가 저장 8주에서 2.08mg/g을 나타내었다. 과산화물가의 경우 콩기름으로 튀긴 유과를 5$0^{\circ}C$에서 저장하였을 때 저장 4주까지 급격한 증가를 보이다 4주 이후 감소하였다. 저장 기간에 따른 지방산의 변화는 2$0^{\circ}C$ 저장의 경우 저장 전과 큰 차이를 보이지 않았지만 5$0^{\circ}C$ 저장의 경우 콩기름과 팜유 모두 palmitic acid, stearic acid 및 oleic acid는 저장기간이 경과함에 따라 증가하였고 linoleic acid와 linolenic acid는 감소하였다. 또한 관능검사 결과 콩기름으로 튀긴 유과는 4주 이후 이취미가 발생하기 시작하여, 7주가 지난 후에는 이취미가 보다 강하게 발생하였지만 팜유로 튀긴 유과는 4주째에 이취미가 약간 발생하였으나, 그정도가 미미하였고, 8주째에도 이취미가 강하게 발생하지 않았다. 따라서 유과 튀김시 콩기름을 팜유로 대체한다면 종래 방법으로 제조된 유과에 비해 저장 기간이 증가할 것으로 사료된다.

• Biomolecules & Therapeutics
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• 제31권1호
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• pp.82-88
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• 2023

Genomic analysis indicated that the genome of Drosophila melanogaster contains more than 80 cytochrome P450 genes. To date, the enzymatic activity of these P450s has not been extensively studied. Here, the biochemical properties of CYP6A8 were characterized. CYP6A8 was cloned into the pCW vector, and its recombinant enzyme was expressed in Escherichia coli and purified using Ni²⁺-nitrilotriacetate affinity chromatography. Its expression level was approximately 130 nmol per liter of culture. Purified CYP6A8 exhibited a low-spin state in the absolute spectra of the ferric forms. Binding titration analysis indicated that lauric acid and capric acid produced type I spectral changes, with K_d values 28 ± 4 and 144 ± 20 µM, respectively. Ultra-performance liquid chromatography-mass spectrometry analysis showed that the oxidation reaction of lauric acid produced (ω-1)-hydroxylated lauric acid as a major product and ω-hydroxy-lauric acid as a minor product. Steady-state kinetic analysis of lauric acid hydroxylation yielded a k_cat value of 0.038 ± 0.002 min^-1 and a K_m value of 10 ± 2 µM. In addition, capric acid hydroxylation of CYP6A8 yielded kinetic parameters with a k_cat value of 0.135 ± 0.007 min^-1 and a K_m value of 21 ± 4 µM. Because of the importance of various lipids as carbon sources, the metabolic analysis of fatty acids using CYP6A8 in this study can provide an understanding of the biochemical roles of P450 enzymes in many insects, including Drosophila melanogaster.

• 원예과학기술지
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• 제29권2호
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• pp.144-150
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• 2011

우리나라에서 널리 보급되고 있는 일반감자 '수미'와 일반감자의 단점을 보완하여 개발된 유색감자 6종의 영양성분 및 이화학적 특성을 분석하기 위해 일반성분 및 환원당, 유리당, 유리아미노산, 유기산, 무기질 그리고 색도를 측정하였다. '수미'는 유색감자에 비해 수분 함량이 높았으며, 탄수화물은 '레드'가 18.0%로 감자 중 가장 많았고, 조회분 함량은 모든 유색감자가 '수미'에 비해 높게 나타났다. 또한 조단백, 조지방 함량은 '자서'에서 가장 높게 나타났으며, 조섬유 함량은 '블루'가 1.6%로 가장 높았고, 그 함량은 '수미'의 2배였다. 환원당 함량은 유색감자 중 '로즈'와 '블루'가 '수미'의 3배 이상이었으며, fructose와 glucose가 대부분인 '수미'에 비해 유색감자는 sucrose의 함량이 높았다. 유리 아미노산은 glutamic acid와 arginine, ${\gamma}$-aminobutyric acid가 대부분을 차지하였으며, 유리당은 품종 간 그 함량과 조성이 매우 다양했다. 또한 유기산 함량은 '하령'이 $507.1mg{\cdot}100g^{-1}$으로 가장 높았으며, 무기질은 모든 감자에서 칼륨이 대부분을 차지했다. 색도를 측정한 결과, 명도를 나타내는 Hunter 'L' value는 '자서'에서, 적색도를 나타내는 Hunter 'a' value는 '블루'와 '자심'에서 높았으며, 황색도를 나타내는 Hunter 'b' value는 단면이 노란색을 띄는 '하령'에서 가장 높았다. 이상의 결과로 유색감자는 '수미'에 비해 많은 양의 영양성분을 함유하고 있고 우수한 품질 특성을 나타내어 기능성 식품소재로써의 이용성이 높을 것으로 기대된다.

• 대한의생명과학회지
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• 제23권2호
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• pp.118-127
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• 2017

Elevated serum uric acid and resting heart rate are risk factors and predictors of metabolic syndrome. However, few studies have examined the optimal cutoff value for serum uric acid and resting heart rate to predict metabolic syndrome in Korean adults. Subjects for this study were 22,302 adults (average age 45 years old), who underwent health screening examination from January 2010 to December 2012 at the Health Promotion Center of one hospital in Gyeonggi-do for general health check-up. The uric acid and resting heart rate cutoff values were calculated by ROC analysis for metabolic syndrome. Elevated serum uric acid and resting heart rate were associated with an increased prevalence of metabolic syndrome in Korean adults. The optimal cutoff value for uric acid level to predict metabolic syndrome in adults was 4.95 mg/dL (male 6.35, female 4.55) and optimal cutoff value for resting heart rate to predict metabolic syndrome was 68 beats per minute (male 66, female 68). However, serum uric acid and resting heart rate were found to have limitations for the diagnosis of metabolic syndrome.

• 한국식품저장유통학회지
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• 제4권3호
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• pp.287-293
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• 1997

This study was investigated to viscosity, color, chemical properties, and lipid and fatty acid composition for examination of physical and chemical characteristics of sesame oils. Yield of sesame oil was higher in Ansan sesame than that of Chinese and Dambaek sesame. Viscosity of sesame oils was higher than that of shame oils from Dambaek and Chinese sesame, but turbidity and sedimentation rate were higher in Dambaek's sesame oil than those of Ansan's and Chinese sesame oils. In the acid value, saponification value and iodine value of sesame oils, and chemical characteristics of Dambaek's sesame oil were better than those of the others. The neutral, glycolipid and phosholipid contents of sesame oils were 91.1∼92.1, 2.5∼3.5 and 5.5∼6.4%, respectively. The major fatty acids of sesame oils were oleic, linoleic palmitic and stearic acid. The content of oleic acid was higher in Dambaek's and Ansan's sesame oil than that of Chinese sesame oil, and the content of linoleic acid was higher in Chinese sesame oil than the others. The fatty acid composition of neutral lipid, glycolipid and phospholipid were similar to those of total lipid. The ratio of unsaturated fatty acid and saturated fatty acid was higher in Korean sesame oils than those in Chinese sesame oil. The mineral(Mg, Cu, Fe, In, Al, Mn) content of Korean sesame oils was higher than that of Chinese sesame oil. and heavy metals(Cu, Ag, Pb, Cd, As) were not detected.

• 농업과학연구
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• 제37권2호
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• pp.261-266
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• 2010

In this study, we determined lipid content, total fatty acid composition, trans fatty acid(tFA) content, and acid value of twenty black-bean-sauce noodles collected in Seoul city area. Total lipid contents of twenty samples were determined to be 3.33~9.23% on wet base. Total unsaturated fatty acids were from 47.83% to 83.18%(mainly oleic and linoleic acid). Total saturated fatty acids ranged from 16.06% to 51.48%. Besides, tFA contents in total lipid of samples were ranged from 0.38% to 1.39%, equivalent to 20 to 80mg per 100g of black-bean-sauce noodles. Acid values of lipids extracted from samples ranged from 0.56 to 2.88.