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  • Column liquid chromatography  (1,216)
  • Springer  (1,216)
  • Nature Publishing Group (NPG)
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  • 1
    Electronic Resource
    Electronic Resource
    Application of column liquid chromatography (HPLC) to special problems in food chemistry a laboratory note (1980)
    Springer
    Chromatographia 13 (1980), S. 421-427 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; HPLC ; Amino acids ; Sugars ; Biogenic amines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Liquid chromatography has been used for the determination of amino acids, sugars and biogenic amines in food. Some special problems, for example, determination of patuline in apple juice, hyoscyamine and scopolamine in french beans preserves, were also solved by HPLC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261523
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  • 2
    Electronic Resource
    Electronic Resource
    Chromatographic and mass spectrometric characterization of the structures of the polypeptide antibiotics samarosporin and stilbellin and identity with emerimicin (1983)
    Springer
    Chromatographia 17 (1983), S. 679-685 
    Details
    ISSN: 1612-1112
    Keywords: Samarosporin ; Stilbellin ; Emerimicin ; Peptide Antibiotics (peptaibols) ; Fast atom bombardment MS ; Column liquid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The structural identity of the polypeptide antibiotics, samarosporin I(II) and stilbellin I(II) with emerimicin IV(III) has been established by thin-layer chromatography, quantitative amino acid analysis by ion-exchange chromatography, gas-liquid chromatography of the N-pentafluoropropionyl amino acid n-propyl esters and N,O-bis-pentafluoropropionyl phenylalaninol with quartz capillaries coated with the chiral stationary phase N-propionyl-L-valine-tert-butylamide, and determination of the relative molecular masses and sequence-specific fragments by field desorption fast atom bombardment mass spectrometry. The separation of closely related sequence analogues of the above polypeptides could be achieved by reversed-phase high-performance liquid chromatography with spherical, fully porous octadecylsilyl bonded phases, and 86% aqueous methanol as eluent. The application of both chromatographic and mass spectrometric methods is demonstrated to be most valuable for the characterization of antibiotics with the unusual constituents α-aminoisobutyric acid, isovaline and phenylalaninol. The methology employed is regarded to be applicable to all polypeptide antibiotics of the peptaibol class.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259320
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  • 3
    Electronic Resource
    Electronic Resource
    A new caffeine bonded phase for separation of polyaromatic hydrocarbons and petroleum asphaltenes by high-performance liquid chromatography (1985)
    Springer
    Chromatographia 20 (1985), S. 155-160 
    Details
    ISSN: 1612-1112
    Keywords: Donor-acceptor complexes ; Column liquid chromatography ; Caffeine bonded phase ; 7(n-propyl)theophylline silica ; Petroleum residues and asphalts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The preparation of a new caffeine phase for HPLC is described. The capacity ratios (k′) of about ten polyaromatic hydrocarbons have been determined. It has been shown that the aromatics were eluted according the number of rings, only slightly influenced by the substituents. The performance of the stationary phase is demonstrated with separations of petroleum asphalts and residues and aromatic mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262704
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of nitro-PAHs in diesel exhaust particulate extracts with multicolumn HPLC (1985)
    Springer
    Chromatographia 20 (1985), S. 213-218 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Nitro-PAHs ; Diesel particulate extract ; Column switching-HPLC ; Pyrene-butyric acid stationary phase ; π-acceptor ligands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method is described for the determination of nitrated polynuclear aromatic hydrocarbons (nitro-PAHs), in particular 1-nitropyrene, in diesel particulate extracts. The method employs a multidimensional HPLC (column switching) technique with final on-line peak identification by UV-VIS spectral comparison with standards. To achieve exceptional chromatographic selectivity for nitro-PAHs, a new pyrene butyric acid amide phase has been prepared which is capable of forming donor-acceptor complexes with them. With this technique it is possible to confirm the presence of 1-nitropyrene in the range 3–100 ng/mg on filter-collected diesel soot. Its utility was demonstrated with diesel exhaust extracts spiked with varying levels of 1-nitropyrene and proved to be highly selective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259689
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  • 5
    Electronic Resource
    Electronic Resource
    Size-exclusion chromatographic behavior of bovine serum albumin in uni-uni valent ions solutions (1985)
    Springer
    Chromatographia 20 (1985), S. 303-307 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Size-exclusion ; Dynamic equilibrium ; Ion-pairing interaction ; Monomer-dimer separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Molecular interaction between uni-uni valent ions and bovine serum albumin was investigated by size-exclusion chromatography. Elution profiles are first presented for salt and protein solutions as samples with water as the mobile phase; then for water and protein as samples with salt solutions as the mobile phase. The results suggest the existence of a dynamic equilibrium between the salt ions and the protein ions as reactants and the ion-pair (salt-protein) complex as a product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310387
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  • 6
    Electronic Resource
    Electronic Resource
    Fast determination of tetracycline antibiotics in different media by high-performance liquid chromatography (1985)
    Springer
    Chromatographia 20 (1985), S. 313-322 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Tetracyclines antibiotics ; Quantitation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The use of high-performance liquid chromatography (HPLC) for the identification and determination of tetracycline antibiotics is reviewed. HPLC chromatograms provide fast identification by retention time, tR, and precise quantitation by measurement of peak height or peak area. For separation of tetracycline compounds, most HPLC methods use reversed-phase C18 or C8 columns and UV detection. The HPLC solvent system should have a pH of about 6 to prevent steric changes in the tetracycline molecule. For accurate quantitation it is necessary to avoid tailing and this is accomplished by adding a zwitter ion to the solvent system. Methanol and acetonitrile are frequently used as organic modifiers in these solvent systems. In a single analysis, HPLC methods can be used to separate as many as nine or ten commercially used tetracycline compounds and to determine four to five tetracyclines in commercial tetracycline preparations or in biological fluids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310389
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  • 7
    Electronic Resource
    Electronic Resource
    Simultaneous quantitative determination of amiloride hydrochloride and hydrochlorothiazide in tablets by high-performance liquid chromatography (1985)
    Springer
    Chromatographia 20 (1985), S. 477-481 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Amiloride hydrochloride ; Hydrochlorothiazide ; Quantitative determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A procedure for the simultaneous quantitative determination of amiloride hydrochloride and hydrochlorothiazide by high-performance liquid chromatography is proposed. A reversed-phase LiChrosorb C8 stationary phase is used. The eluent consisted of an acetonitrile/0.1M phosphate buffer pH3 (15∶85) mixture, containing 50mM propylamine hydrochloride. In this system amiloride hydrochloride, a basic drug, eluted with a acceptable asymmetry factor (Asf=2.1). A simple extraction procedure with methanol is used. Relative standard deviations of 0.87% and 1.6% were obtained for amiloride hydrochloride and hydrochlorothiazide respectively. Chlorothiazide, a thiazide diuretic, is a suitable internal standard. Furthermore the method is also specific for other thiazide diuretics, potassium-sparing diuretics and loop diuretics and for the respective hydrolysis productes of both drugs. Analysis time is reduced to a minimum; the chromatographic separation is complete within 6 minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344789
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  • 8
    Electronic Resource
    Electronic Resource
    A study of the elution of macromolecules from columns of thermally-treated controlled-porosity glasses (1985)
    Springer
    Chromatographia 20 (1985), S. 487-494 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Size-exclusion chromatography ; Controlled-porosity glasses ; Boron-enriched glass surface ; Adsorptive properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Controlled-porosity glasses (CPG) are sieves for macromoleculars, very widely applied in chromatographic columns for the separation of polymers and biopolymers by means of size-exclusion chromatography (SEC) and affinity chromatography. This paper deals with the influence of the thermal treatment of CPG on the elution of polymers in SEC columns. The problem is examined for a few mobile phases and for glasses having different porosities. Additionally, the SEC results obtained are compared with the adsorption properties of the glases investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344791
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  • 9
    Electronic Resource
    Electronic Resource
    Separation of hordein proteins from european barley by high-performance liquid chromatography: Its application to the identification of barley cultivars (1986)
    Springer
    Chromatographia 21 (1986), S. 49-54 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Reversed phase ; Ion-exchange ; Barley proteins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary High-performance liquid chromatography using either reversed phase or anion-exchange techniques was used for the fractionation of hordein proteins extracted from European barley. A reversed phase method is presented which utilises an Ultrapore column packed with a wide pore (30 nm) C-3 alkylbonded silica support. Using this method up to 20 components may be separated in 54 min. Elution profiles were found to be reproducible. A further method using rapid anion-exchange chromatography indicated that up to 13 components may be separated, a number which is comparable to that found with electrophoresis. The separation of proteins extracted from different barley cultivars indicated that on the basis of elution profiles high-performance liquid chromatography using either reversed phase or anion-exchange offers considerable potential as a method for barley cultivar identification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310595
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of urinary 5-S-cysteinyldopamine by high-performance liquid chromatography with electrochemical detection (1986)
    Springer
    Chromatographia 21 (1986), S. 645-647 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Electrochemical detection ; Cysteinyldopamine ; Tyrosinase ; Autoxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary 5-S-Cysteinyldopamine, a new metabolite of dopamine, was determined in urine by high-performance liquid chromatography with electrochemical detection. The catechol was detected in 14 of 21 melanoma patients and 7 of 21 normal subjects; the highest values were 657 μg/day for melanoma patients and 44 μg/day for normal subjects. These results suggest that the cysteine conjugate may arise from autoxidation of dopamine but tyrosinase may also participate in the oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02311920
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