2,881 Result(s)
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Article
Reversed-phase high-performance liquid chromatographic separation of theα- andβ-isomers of aspartyl peptides
A high-performance liquid chromatography method is described for the separation of the α- and β-isomers of aspartyl-containing peptides such as N-benzyloxycarbonyl methyl aspartate, protected sweet dipeptide a...
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Bestimmung von Silber in Erzen mit Hilfe der Flammen-AAS
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Article
Equilibrium between α- and β-isomers of dihydroartemisinine and its multiple-peaks in high-performance liquid chromatography
The interconversion between the α- and β-isomers and the multiple-peaks of dihydroartemisinine (dihydroqinghaosu) were investigated in reversed-phase, highperformance liquid chromatography. A convenient method...
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Article
Influence of sample concentration on the elution of monocarboxylic acids in ion-exclusion chromatography
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Article
LC-MS of enzymatic peptic haemoglobin hydrolysate produced at the pilot-plant level
A method is described for the ready identification of any peptide isolated from a complex peptic haemoglobin hydrolysate produced on the pilot-plant scale. A combination of size exclusion and reversed-phase, h...
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On-Line Precolumn Derivatization Method for Determination of Amino Acids with o-Phthalaldehyde and 2-Mercaptoethanol
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Single-Sweep Polarography of Cadmium-3-Hydroxy-1-p-sulfonatophenyl-3-phenyl Triazene Complex
In a 0.3 M sodium hydroxide medium there is a well-defined single-sweep polarographic wave for a Cd(II)-3-hydroxy-1-p-sulfonatophenyl-3-phenyl triazene complex which can be used for the determination of trace amo...
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Article
Direct determination of lead in human blood and selenium, cadmium, copper, zinc in serum by electrothermal atomic absorption spectrophotometry using Zeeman effect background correction
The procedure for the direct determination of lead in human blood and selenium, cadmium, copper and zinc from human blood serum with micro quantities of the samples are described using electrothermal atomic ab...
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Article
Use of a nitrocellulose matrix in laser mass spectrometry
A simple method for obtaining laser mass spectra (LMS) of liquids is described using a nitrocellulose membrane or fibrous material as the sample substrate. Laser mass spectra of liquids are presented along wit...
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A preliminary study of non-EMG peaks
It is shown that part of non-EMG peaks are gamma peaks. The describing function of a gamma peak is derived. The peak area equation and the formation mechanism of a gamma peak are discussed.
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Article
Single Sweep Polarographic Determination of Trace Nitrite in Ferrous and Ascorbic Acid Medium
The (FeNO)2+ complex can be formed in a solution that contains ferrous ion (ammonium ferrous sulfate), nitrite (sodium nitrite) and ascorbic acid. With a drop** mercury electrode, this complex has a catalytic w...
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Article
Effect of adsorption on the retention values in glass capillary columns coated with OV-101
Effect of adsorption on the retention values for C5−C10 alkanes and C1−C8 n-alcohols in glass capillary columns coated with OV-101 is investigated. Adsorption parameters are evaluated from the retention data
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Article
Semi-preparative purification and characterization of peptides from complex haemoglobin hydrolysate by HPLC-mass spectrometry
An important goal of previous high-performance liquid chromatography (HPLC) studies was the development of a simple procedure for the purification of peptides from very complex haemoglobin enzymatic hydrolysat...
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Article
Effect of adsorption on the retention values in glass capillary columns coated with poly(ethylene glycol) 20M
Effect of adsorption on the retention values for some n-alkanes, n-alcohols and esters in glass capillary columns coated with PEG-20M was studied. Adsorption parameters for the used solutes were evaluated from...
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Article
Simultaneous Spectrophotometric Determination of Aluminum(III), Iron(III) and Beryllium(III) in Rainwater by a Matrix Method
A rapid and accurate method for the simultaneous determination of aluminum(III), iron(HI) and beryllium(III) is proposed. The method can be applied to the determination of aluminum(IH), iron(III) and beryllium...
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Article
Single Sweep Polarographic Determination of Nitrite by Conversion to Formamidine Disulfide
A sensitive single sweep polarographic peak, related to the nitrite concentration, appears in a slightly acidic solution containing nitrite and thiourea. The peak is ascribed to the reduction of formamidine di...
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Article
Voltammetric determination of traces of cobalt(II) with a chemically modified carbon paste electrode
A new preconcentration and voltammetric determination method for cobalt(II) in aqueous solution with a chemically modified electrode is proposed. The accumulation behaviour and voltammetry of cobalt(II) has be...
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Article
Determination of IO 3 − by flow injection analysis with 5-Br-PADAP and SCN−
This paper reports that a red-violet triatomic ion association is formed by protonated 2-(5-bromo-2-pridylazo)-5-diethylamino-o-phenol, IO 3 − and SCN− in 1.2 ...
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Article
A quantitative study of the adsorption effect on the retention of dicarboxylic acids in ion-exclusion chromatography
Retention values and distribution coefficients for C4−C9 dicarboxylic acids on a column packed with cation exchange resin in the H+ form were determined, using dilute HCl solution as eluent. Based on the Donnan m...
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Article
Fluorimetric determination of tetracycline and anhydrotetracycline
A rapid fluorimetric method employing the complexes of Al3+ with tetracycline (TC) and anhydrotetracycline (ATC) has been used for the measurement of the concentrations of TC and ATC in about 10−7–10−6 mol/l. The...
