• 분석과학
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• 제8권3호
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• pp.371-374
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• 1995

유기게르마늄 화합물인 Ge-132의 분석법을 확립하였다. 이온교환수지 컬럼을 사용하고 $Na_2B_4O_7$ buffer를 이동상으로 하여 Ge-132를 분리한 다음, 전기전도도 검출기를 사용하여 검출하는 방법을 이용한 결과 50pmol의 농도까지 분석할 수 있었다. 이 방법은 Ge-132의 원료와 제품의 품질 관리에 응용이 가능하였다.

• Bulletin of the Korean Chemical Society
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• 제28권4호
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• pp.601-606
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• 2007

The chromatographic behaviors of nucleotides (inosine 5'-monophosphate, uridine 5'-monophosphate, guanosine 5'-monophosphate, and thymine monophosphate disodium salts) on a C18 column were studied with different types of ionic liquids (ILs) as additives for the mobile phase in reversed-phase liquid chromatography (RPLC). Three ILs, 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][BF4]), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIm][BF4]), and 1-ethyl-3-methylimidazolium methylsulfate ([EMIm][MS]), were used. Eluents were composed of water and methanol (90/10%, vol) with the addition of 0.5-13.0 mM of ILs. The effects of the concentration of ILs on retention and separation were investigated and discussed. The results showed that the addition of ILs affects the retention and resolution of the tested compounds. Use of 13.0 mM of [BMIm][BF4] as the eluent modifier resulted in a baseline separation of nucleotides without requiring gradient elution. This study demonstrates that ILs can be potentially applied as a mobile phase modifier in RPLC.

• 한국축산식품학회지
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• 제18권1호
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• pp.9-18
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• 1998

This study was performed to obtain a large quantity of $\alpha$-lactalbumin ($\alpha$-LA) from milk by an improved separation and purification method. Functional properties-solubility viscosity, emulsifying activity, foamability surface hydrophobicity and gelation-of the purified $\alpha$-LA were investigated, $\alpha$-LA was purified in a large quantity by DEAE-Sephacel chromatography using 0.15M NaCl in 20mM Tris-HCl buffer(pH 7.2), as an eluent. The yield and purity of the purified $\alpha$-LA were 23.6%, 92.5%, respect-ively. The solubility viscosity and emulsifying activity of the purified $\alpha$-LA were 92.2$\pm$2% 3.46$\pm$0.19 cP and 345$\pm$5.0m^2$-/g respecively. The foamability of $\alpha$ -LA was 762 after 5min whipping which was lower than that of WPC and showed decreasing tendency with whipping time. The relative surface hydrophobicity of the $\alpha$-LA was formed when a 10% $\alpha$-LA solution containing 100mM NaCl and 20 mM $CaCl_2$ was heated at 92$^{\circ}C$for 40min. The $\alpha$-LA gel showed 31.5 as hardness and showed low springiness and cohesiveness.

• 대한화학회지
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• 제36권6호
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• pp.849-856
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• 1992

간단하고, 경제적이고, 다양한 응용이 가능한 시스템을 이용하여 거울상 이성질체를 분리 및 분취하였다. 소수성 아미노산 이성질체를 N-hexadecyl-L-proline이 코팅된 역상 원심 액체크로마토그래피로써 분리, 분취하였다. 아미노산 이성질체의 용리 및 분리에 영향을 주는 구리(Ⅱ) 농도, pH, 이동상의 유기용매 종류 및 농도, 원심 액체크로마토그래피의 원형 컬럼의 회전속도 등에 대하여 연구하였다. 수 mg의 소수성 아미노산을 분취하였다. 모든 다른 아미노산을 분리 및 분취하려면, 다양한 코팅 리간드에 대하여 연구하여야 한다.

• 동아시아식생활학회지
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• 제16권5호
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• pp.585-591
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• 2006

We report a novel HPLC method for analyzing the capsaicinoids and nonivamide. The following conditions were used: a total column and column temperature of $3^{\circ}C$, a detection wavelength of 280 nm, an eluent containing acetonitrile : 0.5% formic acid(31:69, v/v). The experimental data was compared with standard nonivamide and capsaicin. The results showed that nonivamide was eluted in 96.7 minutes with a recovery ratio of 96.5% after adding known nonivamide. In addition, the detection limit for nonivamide was 18.6 ng. The capsaicinoids from Korean pepper were extracted (after blooming 60th) from 3 breeds cultivated in Korea, Buchon, Chungyang and Hanbando. and crisis it analyzed sympathizes the nonivamide in the result nonivamide from the Buchon and the Chungyang which are not detected from the Hanbando $0.16{\sim}0.24{\mu}g/g$ it detects with very small amount it contains it confirmed the each capsaicinoid with the HPLC and the LC-MS. These results are expected contribute to the quality control of various product processes, which includes product delivery inspection as well as examining the capsaicinoids present in the product for possible medicine manufacture and various foodstuff, and the nonivamide content, which may be a feed for various manufacturing processes involving chemical synthesis.

• 대한화학회지
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• 제34권1호
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• pp.98-101
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• 1990

스칸듐을 Methyl Thymol Blue(MTB)를 사용하여 가시선 흡수분광법으로 정량하는 새로운 방법을 확립하였고 주석슬러그에 스칸듐은 음이온교환수지와 용리액으로는 황산암모늄과 황산의 혼합용액을 사용하여 분리 회수하였다. 스칸듐과 MTB간의 착물의 결합비는 1:1이었고 최대흡수파장은 585nm이고 몰흡광계수는 $2.0 {\times} 10^4\;\iota{\cdot}mol^{-1}{\cdot}cm^{-1}$이다. 주석슬러그 용액을 음이온교환수지에 흡착시키고 위의 용리액으로 용리시키면 스칸듐 이외의 공존이온은 빨리 용출되고 늦게 용출되어 분리 회수된다.

• Bulletin of the Korean Chemical Society
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• 제25권9호
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• pp.1309-1313
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• 2004

A simple and reliable method has been developed to selectively separate and concentrate trace amounts of thallium ion from real samples for the subsequent measurement by flame atomic absorption spectrometry (FAAS). Thallium ions are absorbed quantitatively during passage of aqueous real samples through an octadecyl bonded silica membrane disk modified by 4-(4-Chloro-phenylazo)-2-[(4-hydroxy-phenylamino)-methyl]-phenol. The retained $Tl^+$ ions are then stripped from the disk quantitatively with a minimal amount of thiosulfate solution as eluent. The proposed method permitted large enrichment factors of about 130 and higher. The relative standard deviation for ten replicate extraction of thallium from 1 L samples containing 5 ${\mu}g$ thallium is 1.2%. The break through volume for 5 ${\mu}g$ thallium is 1000 mL. The limit of detection of the proposed method is 11.2 ng of $Tl^+$ per 1000 mL. The effects of various cationic interferences on the recovery of thallium in binary mixtures were studied. The method was applied to the recovery of $Tl^+$ ions from natural water and human hair samples.

• Macromolecular Research
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• 제14권3호
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• pp.383-386
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• 2006

High temperature size exclusion chromatography (SEC) has been used widely for the characterization of crystalline polymers, for which high temperature operation above the polymer melting temperature is required to dissolve the polymers. However, this high temperature operation has many advantages in SEC separation in addition to merely increasing polymer solubility. At high temperature the eluent viscosity decreases, which in turn decreases the column backpressure and increases the diffusivity of the analytes. Therefore, many reports on the high temperature operation of high performance liquid chromatography (HPLC) have focused on shortening the analysis time and enhancing the resolution. However, the application of high temperature SEC analysis to exploit the merits of high temperature operation is scarce. In this article, therefore, we report on a new apparatus design for high temperature SEC.

• KSBB Journal
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• 제21권3호
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• pp.220-223
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• 2006

이온교환 크로마토그래피에서 주요 변수로 샘플 투입량, 용출 NaCl 농도, 용출액 pH를 변화시켜 lysozyme 크로마토그라피 실험을 하였다. 그리고 Aspen Chromatography simulator를 이용하여 위의 변수 변화에 대한 모사된 크로마토그렘을 얻고 그 모사결과들을 실험 결과와 비교하였다. 용출 용액 NaCl의 농도가 높아질수록 단백질의 머무름 시간이 감소하며, 최대 피크의 높이가 높아졌다. pH가 증가함에 따라 최대 피크 높이가 증가하며, 분리 시간이 앞으로 이동하였다. 단백질의 주입량에 따라 분리 시간에 상관없이 최대 피크 높이만 비례적으로 증가하는 것을 확인하였다. 그리고 실험을 통해 얻어진 결과와 시뮬레이션 결과의 비교를 통해 같은 경향을 보임을 확인하였다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제11권6호
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• pp.477-483
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• 2006

Ionic liquids in the form of organic salts are being widely used as new solvent media. In this paper three positional isomers, o-amino benzoic acid, m-amino benzoic acid, and p-amino benzoic acids were separated with four different ionic liquids as mobile phase additives using high performance liquid chromatography (HPLC). The following ionic liquids were used: 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIm][$BF_{4}$]), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIm][$BF_{4}$]), 1-ethyl-3-methylimidazolium methylsulfate ([EMIm][MS]), and 1-octyl-3-methylimidazolium methylsulfate ([OMIm][MS]). The effects of the alkyl group length on the imidazolium ring and its counterion, and the concentrations of the ionic liquids on the retention factors and resolutions of amino benzoic acid isomers were tested. The results of the separations with ionic liquids as the eluents were better than those without ionic liquids. Excellent separations of the three isomers were achieved using 2.0-8.0 mM/L [OMIm][MS] and 1.0-8.0 mM/L [EMIm][MS] as the eluent modifiers.