• 한국환경과학회지
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• 제9권4호
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• pp.319-323
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• 2000

Nitrate-selective ion exchange resin which have bulky tertiary amine as functional group have been synthesized by the reaction of chloromethylated polystyrene-divinylbenzene copolymer and the corresponding tertiary amine [$NR_3=NE_{t3} 1, N{(C_2 H_4 H_3)}_32]$in ethanol, while commercial resin has $NMe_3$ as functional group. The fundamental properties such as bulk density, water content, appearance index, exchange capacity, effective size, uniformity coefficient of synthesized anion exchange resin (1) have been measured. The ion exchange resin (1) and (2) exhibited the better selectivity for nitrate than sulfate in both batch and continuous column experiments.

• 한국산학기술학회논문지
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• 제3권2호
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• pp.156-159
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• 2002

이온교환은 이온성 물질을 제거하는 가장 신뢰성 있는 단위공정일 뿐만 아니라 재사용의 측면에서 매우 경제적이다. 특히 이온교환은 토양화학 분야에서 지난 한 세기 동한 수많은 연구가 진행되어 왔으며, 여러 가지 수처리 공정에 널리 이용되고 있다. 이온의 선택도는 이온의 수화반경과 용액의 농도, 이온의 원자가에 따라 좌우된다. 본 연구는 양이온 평형실험과 칼럼실험을 통해 이온들의 선택도 순서와 바탕음이온에 따른 특성을 조사하였다. 양이온의 선택성은 농도가 낮을수록, 이온의 원자가가 높을수록 증가하였다. 평형실험의 양이온 선택도 순서는 $H^+$ < $K^+$ << $Cu^{2+}$ < $Co^{2+}$ < TEX>$Ca^{2+}$ << $Ce^{3+}$ 이며, 칼럼흡착에서도 선택도 순서는 동일하였다.

• 한국수소및신에너지학회논문집
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• 제19권2호
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• pp.124-131
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• 2008

Crude cytoplasmic fraction of phototrophic purple sulfur bacterium, Thiocapsa roseopersicina NCIB 8347, were initially prepared and purified by sonication, ultracentrifugation, ammonium sulfate fractionation and heat-treatment and it has been previously reported. Using various applications of chromatography far the purification of membrane-bound and soluble hydrogenases from heat-treated enzyme fraction were studied at present report. When the heat-treated enzyme preparation was applied to the anion column chromatography using Q-sepharose, Fraction I and II, which were extracted with the KCl 0-0.5 M gradient, showed the specific evolution hydrogenase activity 3.86 and 2.27 U/mg-protein respectively. Specific hydrogenase activitys of Fraction I and II were further increased to 4.35 and 7.46 U/mg-protein for Fraction I and to 2.49 and 4.41 U/mg-protein fur Fraction II respectively, when hydrophobic interaction column, Phenyl superose, and anion exchange column, Mono-Q, were applied. Size exclusion chromatography using superdex 200 concentrated the hydrogenase Fraction I and II to 9.19 and 7.84 U/mg-protein respectively at the final step of purification.

• 한국연초학회지
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• 제26권2호
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• pp.159-167
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• 2004

This work has been conducted to select appropriate filter materials for removing carbonyl compounds in mainstream tobacco smoke. To investigate of the usability of this filter materials, two types of bead ion exchangers were synthesized and their adsorption characteristics for carbonyl compounds were investigated. Sulfonic acid group-containing cation exchanger and ammonium group-containing anion exchanger were synthesized by the suspension polymerization of glycidylmethacrylate(GMA) and divinylbenzene(DVB) followed by the subsequent functionalization, respectively. The removal efficiency of carbonyl compounds by these two ion exchangers increased in the presence of moisture. However, the amount of carbonyl compounds adsorbed on the anion exchanger was larger than that on the cation exchanger under two levels of water contents tested. This phenomenon seems to arise from the electron delocalization in carbonyl group of the anion exchangers. There was not any significant relationship between the amount of carbonyl compounds adsorbed on ion exchangers and the length of adsorption column. From the large ion exchange capacity and rapid ion exchange reaction rate of the anion exchanger, it is suggested that the anion exchanger may be a good filter material for removing carbonyl compounds in the mainstream tobacco smoke.

• 한국잠사학회:학술대회논문집
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• 한국잠사학회 2003년도 제46회 춘계 학술연구 발표회
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• pp.80-80
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• 2003

The isolation and purification of ferritin from the cricket, Gryllus bimaculatus haemolymph were accomplished by anion exchange column chromatography using HiTrap Q column (1.6 $\times$ 4 cm, Amersham Phamacia Co.), 7$0^{\circ}C$ heat and acid treatment, and gel filtration column chromatography using G4000SW column (0.75 $\times$ 60cm, TOSOH Co.) by FPLC system. (omitted)

• Nuclear Engineering and Technology
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• 제21권4호
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• pp.277-286
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• 1989

PWR 핵연료의 연소도측정은 삼중스파이크(U-233. Pu-242, Nd-150)를 사용한 동위원소 희석 질량분석법으로 U, PU, Nd-148 및 Nd-(145+146)을 정량하여 수행하였다. 이 방법은 먼저 두개의 연속적 이온교환수지 분리과정을 거친다. Pu는 첫번째 음이온 교환수지 분리관(Dowex AG 1 X 8)으로부터 12 M HCl-0.1 M HI 혼합용액으로 분리하고 이어서 0.1 M HCl로 U을 분리하였다. Nd은 질산-메탄올 용리액으로 두번째 음이온 교환수지분리관(Dowex AG 1 X 4) 상에서 분리하였다. 각 부분을 열이온화질량분석법으로 각각의 동위원소비를 측정하였다. Nd-148과 Nd-(145+146) 방법 사이의 차이는 평균 2.07%로 나타났다. 이 결과를 U과 Pu동위원소를 이용한 무거운 원소방법 및 Cs-137의 파괴 감마분광측정법과 비교하였다. 연소도에 대한 U과 Pu의 동위원소 조성의존도와 동위원소사이의 상관관계를 그래프로서 설명하였다.

• FOCUS: LIFE SCIENCE
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• 제1호
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• pp.1.1-1.4
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• 2024

This article provides comprehensive guidance on the maintenance, cleaning, regeneration, and storage of silica-based HPLC (High-Performance Liquid Chromatography) columns. The general considerations emphasize the importance of using in-line filters and guard cartridges to protect columns from blockage and irreversible sample adsorption. While these measures help, contamination by strongly adsorbed sample components can still occur over time, leading to an increase in back pressure, loss of efficiency, and other issues. To maximize column lifetime, especially with UHPLC (Ultra-High Performance Liquid Chromatography) columns, it is advisable to use ultra-pure solvents, freshly prepared aqueous mobile phases, and to filter all samples, standards, and mobile phases. Additionally, an in-line filter system and sample clean-up on dirty samples are recommended. However, in cases of irreversible compound adsorption or column voiding, regeneration may not be possible. The document also provides specific recommendations for column cleaning procedures, including the flushing procedures for various types of columns such as reversed phase, unbonded silica, bonded normal phase, anion exchange, cation exchange, and size exclusion columns for proteins. The flushing procedures involve using specific solvents in a series to clean and regenerate the columns. It is emphasized that the flow rate during flushing should not exceed the specified limit for the particular column, and the last solvent used should be compatible with the mobile phase. Furthermore, the article outlines the storage conditions for silica based HPLC columns, highlighting the impact of storage conditions on the column's lifetime. It is recommended to flush all buffers, salts, and ion-pairing reagents from the column before storage. The storage solvent should ideally match the one used in the initial column test chromatogram provided by the manufacturer, and column end plugs should be fitted to prevent solvent evaporation and drying out of the packing bed.

• 대한화학회지
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• 제41권11호
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• pp.612-638
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• 1997

모나자이트광 속에 포함되어 있는 회토류 원소들을 이온교환수지를 이용하여 분리 회수 하는 방법에 관해 연구하였다. 이온교환수지로는 양이온교환수지와 음이온교환수지를 사용하고, 용리액으로는 EDTA, DTPA, IMDA, Ln-EDTA 용액을 사용하였으며, 양이온교환수지는 retaining 이온 곧 $H^+, Zn^{2+}, Fe^{3+}, Al^{3+}, Cu^{2+}, NH^+_4$으로 치환된 수지를 사용하였다. 음이온교환수지는 EDTA로 치환된 수지에 Ln-EDTA착물을 흡착시켜 분리하였다. 여러 가지 회토류 원소 중에서 선택적으로 한 원소만 분리하기 위해 용리액으로 Ln-EDTA를 사용하였으며, 수지통의 크기 변화와 여러 가지 용리형태의 메카니즘, 그리고 다량의 회토류 원소를 분리 회수하는 방법 등에 관해 연구하였다.

• 대한화학회지
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• 제34권6호
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• pp.606-615
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• 1990

음이온 교환수지를 이용하여 CeO$_2$, Sm$_2$O$_3$ 및 La$_2$O$_3$에 잔류물로 포함된 미량의 희토류원소들을 분리하였고, MTB(Methyl-Thymol Blue)를 가지고 분리된 원소들의 흡광도를 측정하여 순도를 측정하였다. Y$^{3+}$, Yb$^{3+}$, Eu$^{3+}$, Sm$^{3+}$, Nd$^{3+}$, Pr$^{3+}$, Ce$^{4+}$ 및 La$^{3+}$이 각각 1 mg/ml 들어있는 혼합시료 1ml를 수지 상단에 흡착시키고 여러 가지 조성의 메탄올과 질산의 혼합용액을 용리액으로 사용하여 분리하였다. 그 결과를 이용하여 순도의 CeO$_2$, Sm$_2$O$^{3+}$ 그리고 La$_2$O$^{3+}$에 불순물로 들어있는 미량의 다른 희토류원소를 정량하였다.

• 약학회지
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• 제41권5호
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• pp.638-646
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• 1997

The steroid 9${alpha}$-hydroxylase activity has been detected in cytosol fraction, $100,00{\times}g$ supernatant of cell free extract of Mycobacterium fortuitum. The activity was not linear with protein concentration in the assay suggesting 9${alpha}$-hydroxylase is a multicomponent enzyme. The 9${alpha}$-hydroxylase system was partially purified through fractional saturation of ammonium sulfate, strong anion exchange (Mono Q) column chromatography, gel filtration (Superose 12) column chromatography, and testosterone affinity gel chromatography. Ammonium sulfate 50~60% saturated fraction of the cytosol gave 9${alpha}$-hydroxylase activity. For further purification, the half-saturated ammonium sulfate fraction was applied to Mono Q, Superose 12, or affinity gel column. The purification factors of 9${alpha}$-hydroxylase containing fraction after Mono Q, Superose 12, and affinity gel chromatography was 13, 11, and 17 respectively.