scholarly journals Elution characteristics of cations in serial connection of a cation exchange column and an anion exchange column.

1994 ◽  
Vol 43 (2) ◽  
pp. 117-123 ◽  
Author(s):  
Mingyu DING ◽  
Yoshihito SUZUKI ◽  
Hitoshi KOIZUMI
Keyword(s):  
Cation Exchange ◽  
Anion Exchange ◽  
Anion Exchange Column ◽  
Exchange Column ◽  
Serial Connection ◽  
Cation Exchange Column

Excretion of L-Dopa and Its Metabolites in Urine of Parkinson's Disease Patients Receiving L-Dopa Therapy

1971 ◽  
Vol 17 (9) ◽  
pp. 867-871 ◽  
Author(s):  
J I Routh ◽  
R E Bannow ◽  
R W Fincham ◽  
J L Stoll
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Cation Exchange ◽  
Anion Exchange ◽  
Paper Electrophoresis ◽  
Colorimetric Determination ◽  
Anion Exchange Column ◽  
Exchange Column ◽  
Cation Exchange Column

Abstract L-Dopa and its major metabolites were separated from daily 24-h urines from patients with Parkinson’s disease, who were being treated with increasing doses of the drug, up to 4 g per day. An aliquot of each sample was passed through three different ion-exchange columns. Catecholamines (dopamine, epinephrine, norepinephrine, metanephrine, and normetanephrine) were retained on a cation-exchange column, eluted with boric acid, and quantitated by fluorometric analysis. Catechol acids, present in the effluent of the cation-exchange column, were retained on an anion-exchange column. An aliquot of the eluate of the anion-exchange column was used for colorimetric determination of 3,4-dihydroxyphenylacetic acid, while the effluent from this column was used for colorimetric determination of dopa. A second aliquot of the eluate from this column was passed over a column of alumina, which retained all the acidic metabolites except homovanillic acid, which was measured fluorometrically in the effluent from the alumina column. Vanilmandelic acid was determined in another aliquot of each urine sample by use of paper electrophoresis. The excretion pattern elicited suggests a major metabolic pathway for the L-dopa administered to patients with Parkinson's disease.

scholarly journals Ion Chromatographic Method for the Simultaneous Determination of Anions and Cations in Firecrackers and Matches Samples as Known Potential Explosives

2019 ◽  
Vol 15 (1) ◽  
pp. 138
Author(s):  
Muhammad Amin ◽  
Lee Wah Lim
Keyword(s):  
Cation Exchange ◽  
Anion Exchange ◽  
Mobile Phase ◽  
Limit Of Detection ◽  
Reference Method ◽  
Anion Exchange Column ◽  
Exchange Column ◽  
Relative Standard ◽  
Cation Exchange Column

<p class="Abstract">A reference ion chromatography method based on column switching has been presented for the simultaneous determining anions (Cl<sup>−</sup>, ClO<sub>3</sub><sup>−</sup>, NO<sub>2</sub><sup>−</sup>, SO<sub>4</sub><sup>2</sup><sup>−</sup>, and NO<sub>3</sub><sup>−</sup>) and/or cations (NH<sub>4</sub><sup>+</sup>, Na<sup>+</sup>, K<sup>+</sup>, Ca<sup>2+</sup>, and Mg<sup>2+</sup>) using one pump, one type of mobile phase, and one detector. The reference method performed anion-exchange column and cation-exchange column and arranged serially via one 10-port valve. The determination of either anions or cations in one determination system could be made by switching the valve. When the use of 1.25 mM trimellitic acid as a mobile phase and the instrument was operated at a flow rate of 0.6 mL/min, five anions and five cations were determined on the anion-exchange column and the cation-exchange column, respectively. All anions target could be determined completely within 55 minutes, whereas the cations target could be determined within 35 minutes. The calculation of limit of detection using S/N=3 was 3.85 − 14.10 µM for anions and 2.95 − 10.58 µM for cations. The relative standard deviations of all ions were less than 3.82%, 3.29%, and 3.21% for retention time, peak area, and peak height, respectively. The reference method was then applied for the simultaneous determining anions and/or cations contained in firecrackers and matches samples as known potentially explosives.</p>

scholarly journals MELACAK PELAKU TERORISME MELALUI PENENTUAN KANDUNGAN KATION DAN ANION DALAM SAMPEL HASIL PENCUCIAN TELAPAK TANGAN PELAKU DENGAN TEKNIK KROMATOGRAFI ION

2014 ◽  
Vol 16 (1) ◽  
pp. 53-61
Author(s):  
Muhammad Amin
Keyword(s):  
Content Analysis ◽  
Initial Data ◽  
Cation Exchange ◽  
Ion Chromatography ◽  
Good Alternative ◽  
Analytical Instrument ◽  
Chromatography Method ◽  
Anion Exchange Column ◽  
Exchange Column ◽  
Cation Exchange Column

Telah dilakukan analisis kandungan kation (Na+, NH4+, K+, Mg2+ dan Ca2+) dan anion (NO2−,Cl−, ClO3−, NO3−, and SO42−)menggunakan instrumen kromatografi ion terhadap 80 sampel yang berasal dari hasil pencucian telapak tangan penjual petasan/kembang api dan hasil pencucian telapak tangan orang yang diketahui tidak memegang sampel petasan/kembang api sebelumnya. Petasan, kembang api dan korek api adalah 3 jenis bahan kimia yang berpotensi digunakan sebagai bahan peledak. sejumlah5 mM asam tartrate digunakan sebagai eluen untuk pemisahan kelima jenis kation menggunakan kolom penukar-ion kation dan 1 mM asam trimellitik digunakan sebagai eluen untuk pemisahan kelima jenis anion menggunakan kolom penukar-ion anion. Hasil analisis menunjukkan bahwa konsentrasi beberapa kation (Na+, NH4+ dan K+) pada sampel hasil pencucian telapak tangan penjual petasan/kembang api meningkat 2–3x lipat dari sampel hasil pencucian telapak tangan yang tidak memegang sampel. Ion K+ adalah kation penyusun utama dalam ketiga sampel. Ion NO3− adalah anion penyusun utama untuk sampel petasan dan kembang api, dan ion ClO3− adalah anion penyusun utama korek api. Terlihat bahwa instrumen analisis kromatografi ion dapat menjadi alternatif utama dalam membantu dan menyiapkan data analisis kandungan kation dan anion dalam 3 jenis sampel di atas untuk maksud melacak pelaku terorisme.Kata kunci : Kromatografi ion, Pelaku teroris, Telapak tangan, Kation, Anion The analysis of cations (Na+, NH4+, K+, Mg2+ and Ca2+) and anion (NO2–, Cl–, ClO3–, NO3– and SO42–) have been done using ion chromatography method for 80 samples from palm washing of the seller of firecrackers/fireworks, the palm washing known that the person did not touch/hold the sample previously and potentially explosive simulation sample. Firecracker, fireworks, and matches are 3 types of chemicals used as simulation that could potentially be used as explosives. When 5 mM tartaric acid and 1 mM trimellitic acid were used as the eluents, 5 cations and 5 anions could be separated on the cation-exchange column and anion-exchange column, respectively. The analysis results showed that the concentrations of Na+, NH4+, and K+ ions in samples of hands washing from the sellers increased 2-3x comparedto those did not hold the samples previously. K+ ion is the main cation contained in the three types of samples. NO3–ion is the main anion contained in firecracker and fireworks while ClO3− ion is the main anion contained in matches sample. It was concluded that ion chromatography method as an analytical instrument may be a good alternative to prepare the initial data and content analysis of cations and anions in the above three types of samples for counterterrorism purposes. Keywords: Ion chromatography, Terrorist, Palm washing, Cations, Anions

scholarly journals Structural similarity of chymopapain forms as indicated by circular dichroism

1989 ◽  
Vol 257 (1) ◽  
pp. 183-186 ◽  
Author(s):  
S Solis-Mendiola ◽  
R Zubillaga-Luna ◽  
A Rojo-Dominguez ◽  
A Hernandez-Arana
Keyword(s):  
Liquid Chromatography ◽  
High Resolution ◽  
Cation Exchange ◽  
Proteolytic Activity ◽  
Structural Similarity ◽  
Tertiary Structures ◽  
Exchange Column ◽  
Cation Exchange Column ◽  
Modified Proteins ◽  
Circular Dichroïsm

Four chymopapain forms were isolated by high-resolution liquid chromatography on a cation-exchange column. The three major forms possess nearly identical secondary and tertiary structures, as judged from their c.d. spectra; these components showed similar proteolytic activity and Mr values close to that of papain. The fourth isolated component seems to be a mixture of modified proteins.

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