• 동아시아식생활학회지
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• 제10권4호
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• pp.274-280
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• 2000

The effect of heated oil on human nutrition has recently become of great interest to nutritionists and food chemists. However, the detrimental effect of heated oil has been hardly studied extensively and many problems have still remained unsolved. This study was carried out to investigate the storage stability of the heated oils at room temperature (25$\pm$5$^{\circ}C$), with the variation in storage conditions (addition of spices and herbs) for 7 weeks period. The rancidity of the oils according to storage time and condition was measured and compared with TBA, ferric thiocyanate, and DPPH method. For fresh oil, when stored for 7 weeks at room temperature, her was no significant change in the degree of oxidation. But for the heated oil with frying materials, the degree of oxidation significantly increased at 5 weeks(p<0.05). When stored with spices and herbs, the degree of oxidation significantly decreased with storage period(p<0.05). Antioxidative activity of herbs, especially sage group was higher than that of any other group.

• Bulletin of the Korean Chemical Society
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• 제25권7호
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• pp.1019-1024
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• 2004

The present paper is focused on simultaneous sorption concentration of gold (III) and silver (I) from thiocyanate solutions using high-selective anion exchanger AN-25 and subsequent separation of these ions at various concentrations of thiocarbamide (eluent). As a result, silver (I) ions are completely eluted from AN-25 and gold (III) ions remain in the resin phase and can be determined directly in the solid phase by diffuse reflection spectroscopy. It is proposed to use the sorption-spectroscopic method for Au(III) determination in aqueous solutions. The calibration curve is linear in the concentration range of 1-19 mg/L (sample volume is 10.0 mL) and the detection limit is 0.05 ${\mu}g/mL$. The presence of Cu(II), Co(II), Fe(II) do not hinder this determination. Au(III) was determined in industrial solutions.

• 한국환경농학회지
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• 제5권2호
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• pp.135-140
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• 1986

K-bentonite를 K포화용액에서 이온교환법에 의해 제조했다. 모래땅, 황토, 산흙에서 K-bentonite 완효성의 효과를 비교 시험했는데, 특히 모래땅에서 그 효과가 컸다. 알타리무우 및 상치를 이용한 모래땅 재배에서 KCl시용구. 보다 K-bentonite구는 상치의 지상부의 생육과 알타리무우의 근부신장을 월등히 촉진 시켰다. 그러나 적정량을 관수하면서 모래, 산흙, 황토를 이용한 온실내 pot시험에서는 생육차를 발견할 수 없었다. K-bentonite는 무우 및 상치의 Vitamin C, Nitrate, Thiocyanate, Dry wt 등의 함량변화에 영향을 미치지 않았다. K-bentonite 실제 생산에 있어 문제점에 대해 논의하였다.

• Preventive Nutrition and Food Science
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• 제11권1호
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• pp.6-9
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• 2006

This study was conducted to evaluate the antioxidant activity of each fraction from Sedum sarmentosum. Antioxidant activity of each fraction was measured using the DPPH radical assay, the ferric thiocyanate (FTC) method, and thiobarbituric acid (TBA) method. The antioxidant activities were then compared with that of BHT(synthetic antioxidant). The ethyl acetate and butanol fractions were found to have significant DPPH radical scavenging activity, with scavenging potencies showing 90.61 % and 87.02%, respectively. Total phenolic compound contents, determined according to the Folin-Denis method, were found to be in the order of ethyl acetate>butanol>ethanol>chloroform>aqueous fraction. From the results, we have been able to establish a positive correlation between the antioxidant activity and the total phenolic compound content of the sample. The antioxidant activity in a linoleic acid system was measured using the ferric thiocyanate (FTC) method and thiobarbituric acid (TBA) method. The ethyl acetate fraction had the highest antioxidant activity among the tested fractions. On the basis of these results, the ethyl acetate fraction provided equivalent or higher antioxidant activity as compared to BHT. These results suggest that Sedum sarmentosum is a potentially useful antioxidant for foods, cosmetics, and medicine.

• 한국식품과학회지
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• 제24권1호
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• pp.31-36
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• 1992

검은깨에 포함된 항산화활성물질의 검색을 횐깨와 병행하여 수행한 결과, 흰깨와 같이 검은깨에도 항산화 활성물질의 존재가 인정되었으며, 활성의 크기는 흰깨가 검은깨보다 약간 높았으며 볶음처리를 하면 항산화활성이 증가하였다. 이들 참깨에 함유된 활성획분의 chromatography상의 거동에 있어서 상당부분 유사성이 인정되었다. 또 볶은 깨의 기름과 박을 분리하여 활성을 검정한 결과 양자에 포함된 활성본체가 서로 유사하였으며 활성의 강도는 기름의 경우가 훨씬 강하였고, 박의 경우 항산화 활성이 기름에 비해 약하다고는 하나, 상당한 항산화 활성물질의 잔류가 인정되었다.

• 대한화학회지
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• 제12권4호
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• pp.139-141
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• 1968

液狀이온交換體 Amberite LAI을 chloroform에 10%로 묽혀서 鹽酸算性에서 Bi(III), As(III), Sb(III), Zn(II) 및 Fe(III)의 推出率을 試驗한 結果, Zn(II)는 2M에서 98%. As(III)는 7~14M에서 Sb(III)는 2~4M에서 , Fe(III)는 6~10M에서 蒼鉛과 定量的으로 分離되었다. 그리고 chloroform을 溶媒로 썼을 때는 xylene이나 hexane을 溶媒로 썼을때보다 더 急傾斜를 이루는 推出率曲線을 나타냈다. 各各의 不純物을 分離後 Zn(II)는 dithizone. As(III)는 Gutzeit method, Sb(III)는 brilliant green, Fe(III)는 thiocyanate에 依한 比色方法으로 定量하였다.

• 한국결정학회지
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• 제12권4호
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• pp.222-226
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• 2001

$Ni(L)_4(NCS)_2$(1) (L=2-ethylimidazole)착물의 합성하고 단결정 구조를 규명하였다. 이 착물은 정방정계, 공간군 P4nc a=10.587(2), $c=12.927(3){\AA}$, $V=1448.9(4){\AA}$, Z=2로 결정화되었으며 676개의독립적인 회절반점에 대한 최종 신뢰도 인자 $R_1$ 및$wR_₂$값은 각각 0.0581 및 0.1675이었다. 이 착물의 결정 구조는 Ni(II) 금속 원자에 4개의 2-ethylimidazole리간드의 질소 원자가 xy 평면에 배위되고 있고. 2개의 isothiocyanate 리간드의 질소원자 z축 방향에서 트란스 형태뢰 배위되어 균일한 팔면체 구조의 단핵 착물을 형성한다.

• 한국식품위생안전성학회지
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• 제13권1호
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• pp.1-5
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• 1998

본 연구는 E. coli O157:H7에 대한 LP system(lactoperoxidae/thiocyanate/hydrogen peroxide)의 항균효과를 측정하기 위해 수행되었다. 초기 접종수준($10^{2},\;10^{4},\;10^{7}cfu/ml$), LP의 농도 (10ppm, 20ppm, 30ppm), 배지종류 (TSB, UHT milk, raw milk), 배양온도 ($5^{\circ}C,\;10^{\circ}C,\;15^{\circ}C$) 등에 따라 E. coli O157:H7에 대한 항균효과를 측정, 비교한 결과, 초기 접종수준을 $10^2/ml$으로 하였을 때와 LP의 농도를 10ppm 및 $5^{\circ}C$ 배양에서 항균력이 가장 높게 나타났다.

• 한국안전학회지
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• 제10권4호
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• pp.47-59
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• 1995

The perchlorate, thiocyanate, and nitrate ion-selective PVC membrance electrode for measuring hazardous anion in waste water were developed by incorporating the quaternary ammonium salts as active material. Ion-selective characteristics in waste water were studied by the useful pH range, the selective coefficients to various interfering anions, and the stability of electrode potential. DBP was best as a plasticizer. The effect of the membrane thickness on the electrode characteristics was improved with decreasing the membrane thickness, but below the optimum membrane thickness the electrode exhibited an inverse trend. The electrode potential of perchlorate, thiocyanate, and nitrate electrode with TDDA, as active material, was stable within the pH range 4-11, 3-12, and 4-10 repectively. And the long-term potential stability of these electrodes were 3.0, 3.5, and 3.5 months respectively. The order of the selectivity coefficients was as shown below ; $ClO_4{^-}$ > $SCN^-$ > $I^-$ > $NO_3{^-}$ > $Br^-$ > $CN^-$ > $F^-$ > $Cl^-$ > $Ac^-$ > $H_2PO_4{^-}$, $SO_4{^-}$.

• Asian-Australasian Journal of Animal Sciences
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• 제5권1호
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• pp.7-11
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• 1992

Body water compartments in vivo were determined in Holstein cattle with age ranging from 5 to 521 days to obtain an equation to estimate volumes of body water. Live weight ranged from 47 to 480 kg. Compartments were determined as antipyrine space for total body water (TBW), thiocyanate space for extracellular water (ECW) and Evans blue dye space for plasma water (PW). Body water compartments expressed as a percentage of live weight decreased as age in days increased and significantly correlated with age in days. Regression analyses revealed that prediction equations had low accuracy. Regression equations of body water compartments on live weight (WT, kg) were useful for the prediction of body fluid with a high accuracy. Live weight significantly regressed on age in days (Day), which was inferred to be utilized for estimation of standardized live weight in case animals were emaciated by certain causes such as severe diarrhea or dehydration. In conclusion, following equations were presented to estimate body water compartments of cattle in vivo : TBW in liters = $0.556({\pm}0.007)WT+10$, r = 0.993, $SE{\pm}0.7$ ECW in liters = $0.321({\pm}0.008)WT+10$, r = 0.978, $SE{\pm}0.8$ PW in liters = $0.0502({\pm}0.0012)WT+1.6$, r = 0.0983, $SE{\pm}0.1$ WT (kg) = $0.772({\pm}0.018)Day+24$, r = 0.982, $SE{\pm}2.3$.