The enrichment of magnesium isotopes by AM15C5 bonded ion exchanger

2002 ◽  
Vol 90 (1) ◽  
Author(s):  
D. W. Kim ◽  
B. M. Kang
Keyword(s):  
Ion Exchange ◽  
Elution Curve ◽  
Solution Phase ◽  
Ion Exchanger ◽  
The Novel ◽  
Isotope Enrichment ◽  
Magnesium Isotopes ◽  
Resin Phase ◽  
Separation Factors ◽  
Elution Chromatography

SummaryMagnesium isotope enrichment was investigated by chemical ion exchange with a synthesized 2′-aminomethyl-15-crown-5(AM15C5) bonded Merrifield peptide resin using elution chromatography. The capacity of the novel crown ion exchanger was found to be 2.3 meq/g dry resin. The heavier isotopes of magnesium were enriched in the solution phase, while the lighter isotopes were enriched in the resin phase. The separation factor was determined according to the method of Glueckauf from the elution curve and isotopic assays. The separation factors of

Magnesium Isotope Effects by Ion Exchange Using Monoazacrown Bonded Merrifield Peptide Resin

2002 ◽  
Vol 57 (9) ◽  
pp. 1072-1078 ◽  
Author(s):  
Dong Won Kim ◽  
Hai Il Ryu ◽  
Byeong Kwang Jeon
Keyword(s):  
Ion Exchange ◽  
Distribution Coefficient ◽  
Isotope Effects ◽  
Solution Phase ◽  
Magnesium Isotopes ◽  
Magnesium Isotope ◽  
Mass Effects ◽  
Resin Phase ◽  
Separation Factors

Magnesium isotope effects by ion exchange using monoazacrown (1-aza-18-crown-6) bonded Merrifield peptide resin were investigated. The capacity and distribution coefficient were determined. The separation factors, (24Mg2+/25Mg2+)Resin/(24Mg2+/25Mg2+)Solution, (24Mg2+/26Mg2+)Resin/(24Mg2+/26Mg2+)Solution, and (25Mg2+/26Mg2+)Resin/(25Mg2+/25Mg2+)Solution were 1.0071, 1.0132, and 1.0068, respectively. The heavier magnesium isotopes were enriched in the solution phase, while the lighter isotopes were enriched in the resin phase. It was found that the hydration and isotope mass effects are more significant than that of the complexation

Chromatographic separation of lithium and magnesium isotopes by manganese(IV) oxide

2002 ◽  
Vol 90 (3) ◽  
Author(s):  
D. W. Kim ◽  
C. S. Kim ◽  
N. S. Lee ◽  
H. I. Ryu
Keyword(s):  
Ion Exchange ◽  
Chromatographic Separation ◽  
Sodium Acetate ◽  
Solution Phase ◽  
Sodium Acetate Solution ◽  
Acetate Solution ◽  
Magnesium Isotopes ◽  
Elution Chromatography

SummarySeparation of lithium and magnesium isotopes was investigated by chemical ion exchange with a manganese(IV) oxide using an elution chromatography. The capacity of manganese(IV) oxide was 0.5 meq/g. Two molar sodium acetate solution was used as an eluent. The heavier isotopes of lithium and magnesium were enriched in the solution phase, while the lighter isotopes were enriched in the MnO

Synthesis of AM15C5 Bonded Merrifield Peptide Resin and its Separating Properties

2002 ◽  
Vol 57 (3) ◽  
pp. 355-359
Author(s):  
Dong Won Kim ◽  
Byung Moo Kang ◽  
Nam-Soo Lee ◽  
Chang Suk Kim ◽  
Haiil Ryu ◽  
...  
Keyword(s):  
Solution Phase ◽  
Ion Exchanger ◽  
Mass Effects ◽  
Resin Phase ◽  
Separation Factors

AbstractA 2-aminomethyl-15-crown-5 (AM15C5) bonded Merrifield peptide resin was synthesized. The capacity of this crown ion exchanger was 2.25 meq/g of dry resin. The heavier isotopes of magnesium were enriched in the solution phase, while the lighter isotopes were enriched in the resin phase. The hydration and isotope mass effects dominated over those of the complexation and properties of the exchanger. The separation factors of 24Mg2+/25Mg2+, 24Mg2+/26Mg2+, and 25Mg2+/26Mg2+ isotope pair fractionations were 1.0012, 1.0023, and 1.0011, respectively.

The Mechanism of the Sorption of Monovalent Cations on Cobalt(II)-hexacyanoferrate(II)

1978 ◽  
Vol 33 (10) ◽  
pp. 1099-1101 ◽  
Author(s):  
T. Ćeranić ◽  
D. Trifunović ◽  
R. Adamović
Keyword(s):  
Ion Exchange ◽  
Chemical Properties ◽  
Solution Phase ◽  
Ion Exchanger ◽  
Monovalent Cations ◽  
Dilute Solutions ◽  
Physico Chemical ◽  
The Given ◽  
Exchange Properties ◽  
Competing Ions

Abstract Cobalt(II)-M-hexacyanoferrate(II), M = K, NH4, Cs, as synthetic sorbents have ion exchange properties selective for monovalent cations. They show a higher selectivity for the ions with larger crystal radius if the sorption takes place in dilute solutions, whereas in concentrated sulutions the selectivity sequence is reversed. The phenomenon is attributed to the differences in physico-chemical properties of the given pair of competing ions in the solution phase and to steric limitations in the phase of ion exchanger.

Synthesis and Separating Properties of Tris(Merrifield Peptide Resin)

2002 ◽  
Vol 57 (1) ◽  
pp. 107-112 ◽  
Author(s):  
Dong Won Kim ◽  
Chang Suk Kim ◽  
Nam-Soo Lee ◽  
Haiil Ryu ◽  
Jong Seung Kim
Keyword(s):  
Column Chromatography ◽  
Separation Factor ◽  
Chromatographic Separation ◽  
Single Stage ◽  
Solution Phase ◽  
Ion Exchanger ◽  
Lithium Isotopes ◽  
Resin Phase ◽  
Stage Separation

A triazacrown ion exchanger, 1,13,16-trioxa-4,7,10-triazacyclooctadecane (TOTA)-4,7,10- tris(Merrifield peptide resin) was synthesized. This resin has a capacity of 0.1 meq/g dry resin. The resin was used for the elution chromatographic separation of lithium isotopes. Upon column chromatography [0.2 cm I. D. x 35 cm height] using 3.0 M NH4Cl solution as an eluent, the single stage separation factor of 1.027 was obtained. The heavier isotope, 7Li+, was enriched in the resin phase, while the lighter isotope, 6Li+, was enriched in the solution phase.

Maize Stalk as Natural Ion Exchanger for Hazardous Pollutants

2017 ◽  
Vol 68 (8) ◽  
pp. 1726-1731
Author(s):  
Nicoleta Mirela Marin ◽  
Luoana Florentina Pascu ◽  
Ioana Stanculescu ◽  
Ovidiu Iordache ◽  
Denisa Jianu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Kinetic Models ◽  
High Selectivity ◽  
Ion Exchanger ◽  
Exchange Equilibrium ◽  
Waste Waters ◽  
Cationic Species ◽  
Hazardous Pollutants ◽  
Tailing Ponds

This paper recommends maize stalk as a cheap natural ion exchanger. Ion exchange equilibrium was studied using thermodynamic and kinetic models. The results showed a high selectivity towards cationic species of antimony (III), molybdenum (VI), lead (II) and arsenium (III). Waste waters and sediments from tailing ponds samples were analysed.

scholarly journals Evaluation of a System to Screen for Stimulators of Non-Specific DNA Nicking by HIV-1 Integrase: Application to a Library of 50,000 Compounds

2011 ◽  
Vol 22 (2) ◽  
pp. 67-74 ◽  
Author(s):  
Malgorzata Sudol ◽  
Jennifer L Fritz ◽  
Melissa Tran ◽  
Gavin P Robertson ◽  
Julie B Ealy ◽  
...  
Keyword(s):  
High Throughput ◽  
High Throughput Screening ◽  
Solution Phase ◽  
The Novel ◽  
Endonuclease Activity ◽  
Viral Dna ◽  
Hit Rate ◽  
Dna Nicking ◽  
Hiv 1 ◽  
Stimulation Of

Background: In addition to activities needed to catalyse integration, retroviral integrases exhibit non-specific endonuclease activity that is enhanced by certain small compounds, suggesting that integrase could be stimulated to damage viral DNA before integration occurs. Methods: A non-radioactive, plate-based, solution phase, fluorescence assay was used to screen a library of 50,080 drug-like chemicals for stimulation of non-specific DNA nicking by HIV-1 integrase. Results: A semi-automated workflow was established and primary hits were readily identified from a graphic output. Overall, 0.6% of the chemicals caused a large increase in fluorescence (the primary hit rate) without also having visible colour that could have artifactually caused this result. None of the potential stimulators from this moderate-size library, however, passed a secondary test that included an inactive integrase mutant that assessed whether the increased fluorescence depended on the endonuclease activity of integrase. Conclusions: This first attempt at identifying integrase stimulator compounds establishes the necessary logistics and workflow required. The results from this study should encourage larger scale high-throughput screening to advance the novel antiviral strategy of stimulating integrase to damage retroviral DNA.

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