Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Irena Němcová"'
Autor:
Karel Nesměrák, Irena Němcová
Publikováno v:
Monatshefte für Chemie - Chemical Monthly.
Physicochemical properties of pharmacological interest were determined for ten 6H-pyrimido[2,1-a]isoindoles. The compounds studied were found to be weak bases with a pKa ranging from 2.38 to 3.46. Furthermore, the association constants of the studied
Autor:
Karel Nesměrák, Irena Němcová
Publikováno v:
Analytical Letters. 45:330-344
An overview is provided of spectrometric methods useful for age estimation of historical manuscripts (medieval ones in particular), in order to confirm their authenticity. Individual methods (infrared and Raman spectroscopy, mass spectrometry, atomic
Publikováno v:
Analytical Letters. 42:989-999
A new method for flow-injection analysis (FIA) for the determination of penicillins based on the extraction and spectrophotometric determination of ion associates with selected thiazine dyes (methylene blue, azure A, and azure B) is proposed. The rea
Publikováno v:
Analytical Letters. 42:646-658
A study of the effect of the anionic surfactant dodecyl sulfate, the cationic surfactant carbethoxypentadecyl trimethyl ammonium bromide (Septonex), nonionic surfactant p-octyl phenyl polyoxyethylene (Triton X-100), and a strong electrolyte (KBr) on
Publikováno v:
Analytical Letters. 40:1167-1175
A new method for the flow‐trough spectrophotometric determination of chondroitin sulfate in presence of Azure B was developed. A study was done under both static and flow‐trough conditions. Statistic factorial design was used to find the signific
Autor:
Karel Nesměrák, Irena Němcová
Publikováno v:
Analytical Letters. 39:1023-1040
Overview of electrochemical methods for critical micelle concentration (cmc) determination is given. The principles and examples of cmc determination by conductometry, potentiometry, tensammetry, polarography, voltammetry, electrophoresis, and isotac
Publikováno v:
Journal of Inclusion Phenomena and Macrocyclic Chemistry. 54:47-51
The formation of ternary complexes of lanthanide–calix[4]arene with sulphophthalein dyes was studied. The extraction of model system Gd(III)–calix[4]arene–bromothymol blue was characterized and the distribution, extraction, and stability consta
Publikováno v:
Collection of Czechoslovak Chemical Communications. 71:179-189
Acid-base properties and aggregations of 9-(alkylsulfanyl)- and 9-(arylsulfanyl)acridine derivatives were studied as a part of systematic study of physicochemical properties of these compounds synthesized as potential drugs. The effect of the (2-hydr
Publikováno v:
Analytical Letters. 37:263-272
Mass spectrometry combined with gas chromatography (GC‐MS) or capillary liquid chromatography (CLC‐MS) was successfully utilized for structural characterization and purity control of synthesized biologically active thioacridine derivatives. Obtai
Publikováno v:
Analytical Letters. 34:2457-2464
A new flow-through method (flow injection analysis, FIA) for the lidocaine assay, using extraction of ion – associate with bromocresol green, was proposed. The optimum reaction and flow-through conditions (reagent concentrations, pH, flow rates of