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  • Column liquid chromatography  (10)
  • Springer  (10)
  • 1995-1999  (10)
  • 1980-1984
  • 1996  (10)
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Verlag/Herausgeber
  • Springer  (10)
Erscheinungszeitraum
  • 1995-1999  (10)
  • 1980-1984
Jahr
  • 1
    Digitale Medien
    Digitale Medien
    Simultaneous determination of triprolidine, pseudoephedrine, paracetamol and dextromethorphan by HPLC (1996)
    Springer
    Chromatographia 43 (1996), S. 496-500 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Pharmaceutical formulations ; Triprolidine ; Pseudoephedrine ; Paracetamol ; Dextromethorphan
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A simple, rapid and specific HPLC method has been developed for the determination of triprolidine, pseudoephedrine, paracetamol and dextromethorphan, in combination, in different pharmaceutical dosage forms, using a reversed-phase C18 column, gradient elution, and UV detection at 254 and 280 nm. No preliminary extraction procedure is required for liquid formulations and a very simple extraction procedure is required for tablets and creams. The recovery of the drugs ranged from 96.0 to 98.7%. The assay results obtained for eight commercially available formulations were in agreement with the amounts declared. The linearity and precision of the method have been assessed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02293000
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  • 2
    Digitale Medien
    Digitale Medien
    HPLC determination of rhodamine B (C.I. 45170) in cosmetic products (1996)
    Springer
    Chromatographia 43 (1996), S. 76-78 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Rhodamine B in cosmetics
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A method is proposed for the extraction, separation, identification and quantitative measurement of rhodamine B in cosmetics samples The colour is extracted with a solution of orthophosphoric acid in either water or DMF (depending on the type of cosmetic) adsorbed on a polyamide column, and then eluted with water and methanol. Further clean-up of the extract is performed by means of a Bond Elut C-18 cartridge, from which rhodamine B is eluted with methanol-water (8∶2). The final eluate is examined by HPLC. Chromatography is performed on a C-18 column with a gradient elution from 50∶50 to 70∶30 of acetonitrile-water, containing 0.1 M sodium perchlorate, in 15 min. A diodearray detector enables peak purity analysis. The method gives recovery values of approximately 90%, or better, and the reproducibility is within 4%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02272825
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  • 3
    Digitale Medien
    Digitale Medien
    Study on the relationship between retention behavior and molecular structure parameters of substituted benzene derivatives in RPLC (1996)
    Springer
    Chromatographia 42 (1996), S. 43-48 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Substituted benzenes ; Solubility parameter ; Substituent constant
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A quantitative structure-retention model derived from the concept of hydrophobic substituent constant (π) and the total solubility parameter (δT) has been established. It has been used to predict successfully the retention behavior of a number of solutes on various columns in several different eluents. The experimental results indicate that the model can be employed for the prediction of retention of substituted benzenes in a large volume fraction range of mobile phase. In addition, the physical meaning of the sign and the influence of the coefficients of the model on the retention process had been discussed together with the dependence of these coefficients on the composition of mobile phase.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02271054
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  • 4
    Digitale Medien
    Digitale Medien
    Sample size and retention values in gradient liquid chromatography of synthetic polymers (1996)
    Springer
    Chromatographia 42 (1996), S. 185-190 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Gradient elution of synthetic polymers ; Polystyrene and various styrene copolymers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Retention times in gradient liquid chromatography of synthetic polymers are often dependent on sample size. They increase with column load if the separation mechanism is governed by a solution process but decrease with increasing load if the mechanism is governed by adsorption. Since retention times independent of sample size are a prerequisite for peak identification as well as for the correct measurement of elution bands of samples with a broad distribution, measures to counteract sample-size effects deserve attention. Usually both solubility and adsorption are effective in gradient liquid chromatography of synthetic polymers. An appropriate balance of both effects is suitable for diminishing the influence of sample size on retention time of synthetic polymers. Ternary gradients allowing independent control of solubility and adsorption are promising.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02269651
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  • 5
    Digitale Medien
    Digitale Medien
    High performance liquid chromatography of disaccharides on a porous graphitic carbon column applying post-column derivatization with benzamidine (1996)
    Springer
    Chromatographia 43 (1996), S. 254-260 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Carbohydrates ; Anomer separations ; Post-column derivatization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A sensitive post-column fluoresence method based on the reaction of reducing sugars with a fluorigenic reagent (benzamidine) under alkaline conditions and elevated temperature is described. Optimum reaction conditions suitable for the detection of fluorescent reaction products have been investigated. A porous graphitized carbon column (shandon Hypercarb) was employed as the chromatographic solid phase and elution was isocratic by an aqueous acetonitrile mixture. A special problem in sugar analysis is the tendendy of anomer formation giving doublet peaks. This tendency varies largely among the different sugars, and systematic studies on conditions that eliminate this problem were performed. Efficient and selective separations of a series of disaccharides were obtained using high temperatures and a low concentration of acetonitrile in the mobile phase. The detection limits (S/N=3) with an injection volume of 20 μL ranged from 10–60 picomoles. Linear calibration graphs were obtained in the 2–20 μM concentration range (r 2〉0.99). A relative standard deviation between 1–3% (n=6) demonstrated good precision of the developed system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02270990
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  • 6
    Digitale Medien
    Digitale Medien
    Hexamethyldisiloxane as a mobile phase component for normal phase liquid chromatography (1996)
    Springer
    Chromatographia 43 (1996), S. 647-653 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Hexamethyldisiloxane ; Mobile phase component ; Silica column
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Hexamethyldisiloxane (HMDX) has been evaluated as a modifier solvent for the normal phase separation of substituted naphthalene componds as well as aromatics such as nitrobenzene, acetophenone, benzonitrile, and aniline. It is found to be a weaker eluting solvent than n-butyl ether and other commonly used normal phase solvents filling a niche in the eluotropic series. HMDX exhibited an unusual retention factor (k′) profile as a function of mobile phase composition in hexane. In a range from 0 to 40 %, thek′ values remained quite constant with increasing HMDX composition. As the concentration of HMDX progressed to 100 %, thek′ values actually increased in a generally linear fashion. This trend ink′ is due to longer solute retention not just a change in the retention time of the unretained component. Although slight silanization of the silica column may occur with initial use of HMDX, retention of these analytes on a commerical C-1 silica column is much lower with no positivek′ slope with increasing HMDX. The chromatographic data provide evidence that HMDX is likely adsorbed to the silica surface and a solute partitioning mechanism may be operative.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02292982
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  • 7
    Digitale Medien
    Digitale Medien
    Comparative study of the use of high-performance liquid chromatography and capillary electrophoresis for determination of phenolic compounds in water samples (1996)
    Springer
    Chromatographia 43 (1996), S. 619-624 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Capillary electrophoresis ; Phenolic compounds ; Water samples
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A comparative study of high-performance liquid chromatography (HPLC) and capillary zone electrophoresis (CZE) for determination of eleven EPA priority phenols in water samples is discussed. The repeatability, linearity and detection limits of both methods are compared. A solid-phase extraction method using a highly cross-linked styrene-divinylbenzene copolymer sorbent is used for the off-line preconcentration process in order to determine these compounds in water at low levels. Both methods are used to determine phenolic compounds in Ebro river and industrial waste water. Identification was achieved by comparison of the UV spectra corresponding to the different peaks, acquired with a diode-array detector, with those in a spectral library.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02292977
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  • 8
    Digitale Medien
    Digitale Medien
    Siliceous materials with the surface polymer layer composed of dextran-polyimine mixture as column packings for liquid chromatography (1996)
    Springer
    Chromatographia 42 (1996), S. 49-55 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Dextran-polyimine stationary phases ; Affinity ligands ; Ligand-exchange chromatography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Forming a polymer layer on the surface of siliceous materials is one of the methods for protecting the silica skeleton from dissolution in alkaline mobile phases as well as eliminating the negative influence of silanol groups on separated molecules e.g. proteins. Polysaccharides, especially their derivatives bearing amine groups, can play the role of the surface layer. This paper discusses the possibilities of preparing such a layer by cross-linking a dextran-polyimine mixture (rather than the traditionally used DEAE-dextran) deposited on the surface of the solid material. The results presented prove the utility of synthesized materials as supports for affinity ligands in high performance affinity chromatography or as supports for complexed metal ions in ligand-exchange chromatography. The properties of the sorbents with a polymer layer can be changed both by the composition of the cross-linked mixture and by chemical modification.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02271055
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  • 9
    Digitale Medien
    Digitale Medien
    Supercritical fluid extraction of carbamate pesticides from soils and cereals (1996)
    Springer
    Chromatographia 42 (1996), S. 206-212 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Supercritical fluid extraction ; Carbamate pesticides ; Soils ; Cereal
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A method for the supercritical fluid extraction of carbamate pesticides (propoxur, aminocarb, carbaryl and methiocarb) from soil and cereal samples using CO2 is proposed. Extractions were at 378 bar and 54 °C. Analytes were determined in the extracts by HPLC with fluorescence detection after post-column derivatization. Recoveries from spiked soil ranged between 39.6 and 91.7%, depending on analyte and soil components. Lowest recoveries were from sandy soils. Aminocarb could not be recovered from any soil using CO2. Recovery of aminocarb from diatomaceous earth was improved by adding methanol to the extraction cell prior to SFE, but the effect was not observed in soil samples. Recoveries for propoxur and aminocarb from spiked wheat were about 75%, and only between 30–50% for aminocarb from corn and oats, and carbaryl from wheat. Fat was coextracted using CO2 and retained in the trap together with the analytes, however, appropriate rinsing solvent allowed on-line clean-up of the extract.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02269654
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  • 10
    Digitale Medien
    Digitale Medien
    Influence of organic modifier and temperature on the enantiomeric separation of γ-lactams by HPLC (1996)
    Springer
    Chromatographia 43 (1996), S. 365-368 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Enantioseparation ; Chiralcel OD ; γ-Lactams
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A high-performance liquid chromatographic method is reported for the resolution of the enantiomers of a series of fused γ-lactams (2,7-diaza-3-oxo[3.3.0]octan-6-ones) with probable anti-HIV and anticancer activity. Resolution was achieved on a Chiralcel® OD column, cellulose tris-(3,5-dimethylphenyl carbamate) adsorbed on macroporous silica gel; mixtures ofn-hexane and isopropyl alcohol in different proportions were used as the mobile phase. The analysis was studied at different temperatures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02271012
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