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  • Column liquid chromatography  (839)
  • Springer  (839)
  • American Meteorological Society
  • Springer Nature
  • 1995-1999  (344)
  • 1990-1994  (495)
  • 1960-1964
Collection
Keywords
Publisher
  • Springer  (839)
  • American Meteorological Society
  • Springer Nature
  • Wiley-Blackwell  (5)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    An optimized direct method for the determination of carboxylic acids in beverages by HPLC (1990)
    Springer
    Chromatographia 29 (1990), S. 54-58 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Carboxylic acids ; Fruit juices ; Wine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A direct method for the simultaneous determination of tartaric, malic, lactic, acetic, citric, shikimic, fumaric and succinic acids in fruit juices and wines by isocratic reversed phase HPLC is reported. The variables (pH, ionic strength, flow and temperature) have been optimized by a modification of the original simplex method. The separation factor (s) and calibrated resolution product (r*) have been used as criteria for selectivity optimization. After validation, the method has been applied to the determination of carboxylic acids in apple, orange and lemon juices, white and red wines and musts during the fermenation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261140
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  • 2
    Electronic Resource
    Electronic Resource
    HPLC method for the analysis of organic acids, sugars, and alcohol in extracts of fermenting cocoa beans (1990)
    Springer
    Chromatographia 29 (1990), S. 557-561 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Cation-exchange chromatography ; Organic acids, sugars and alcohol ; Cocoa beans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A cation-exchange HPLC column was evaluated for the analysis of sugars (sucrose, glucose, fructose), acids (citric, lactic and acetic) and ethanol in extracts of cocoa, preserved in a solution of benzoic acid (0,2 % w/v). Optimum sensitivity, precision and selectivity was achieved when the column was operated at a temperature of 25 °C and the combination of a refractive index detector and peak height measured peaks was employed. The limit of detection was 3.5 ng acetic acid, 5.5 ng sucrose, 6.3 ng fructose and lactic acid, 7.3 ng citric acid, 10.5 ng glucose and 12.4 ng ethanol. The extracts of cocoa were stable over a 10 week period, permitting the analysis of large numbers of samples without degradation of the analytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261222
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  • 3
    Electronic Resource
    Electronic Resource
    On the mechanism of solute retention in reversed-phase HPLC systems with methanol-water eluent (1990)
    Springer
    Chromatographia 29 (1990), S. 583-586 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Intermolecular interactions ; Retention mechanisms in RP systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In this paper we consider the possibility of gaining a better insight in the retetion mechanisms of solutes chromatographed in reversed-phase (RP) HPLC systems with the use of methanol-water binary mixtures as the mobile phase. This is done with help of the new retention model presented earlier as the relationship for the retardation coefficient (RF) of solute. The equation constants A, B and C were defined as proportional to the hypothetical retardation coefficients of the solute chromatographed separately in the three theoretically extracted moieties of the mobile phase (i.e. in pure methanol, pure water and the H-bonded associative methanol-water mixture); therefore the message imbedded in their numerical values can refer to the different and often opposite forces acting separately on the solute in a given RP-HPLC system from the side of each mobile phase moiety. An effort to decipher this message was undertaken upon the empirical results obtained for three groups of compounds, i.e., for dithia[3.3]phanes, and mono- and dihydroxyaromatics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261227
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  • 4
    Electronic Resource
    Electronic Resource
    Chiral separation of propranolol and its ester derivatives on an ovomucoid-bonded silica: Influence of pH, ionic strength and organic modifier on retention, enantioselectivity and enantiomeric elution order (1990)
    Springer
    Chromatographia 29 (1990), S. 587-592 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ovomucoid-bonded silica ; Chiral separation ; Propranolol ; Propranolol ester derivatives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The retention, enantioselectivity and enantiomeric elution order of racemic propranolol (PP) and its ester derivatives (O-acetyl,-propyl,-butyl and-valeryl PP) on an ovomucoid-bonded silica column have been investigated with respect to pH, ionic strength and organic modifier. For these cationic solutes, an increase in the organic modifier content and/or a decrease in the pH result in a decreased retention of both enantiomers. Enantioselectivity of the ester derivatives was higher than of underivated PP. The enantiomeric elution order was (S)/(R) for PP and (R)/(S) for the four ester derivatives, when ethanol or 2-propanol was used as the organic modifier. When methanol or acetonitrile was used as the organic modifier, inversion of the enantiomeric elution order was observed for O-valeryl PP with the use of methanol and for PP and O-propyl PP with acetonitrile. These results suggest that at least two chiral binding- or recognitionsites are present in a protein molecule and/or conformational changes occur in the chiral binding- or recognition-site(s) of the protein molecule bonded to a silica matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261228
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  • 5
    Electronic Resource
    Electronic Resource
    Semi-preparative high-performance liquid chromatographic separation of ceralure and related isomers (1990)
    Springer
    Chromatographia 29 (1990), S. 135-138 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Preparative scale separation ; Ceralure ; Trimedlure-related isomers ; Ceratitis capitata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A semi-preparative high-performance liquid chromatographic procedure on 5-μm silica was developed for the isolation of gram quantities of ethyltrans-5-iodo-trans-2-methylcyclohexane-1-carboxylate (B1) and ethyltrans-4-iodo-trans-2-methylcyclohexane-1-carboxylate (B2) for comparative evaluation as male Mediterranean fruit fly,Ceratitis capitata, attractants and for NMR studies. This procedure can also be used analytically to determine the content of B1 (the attractive isomer) in ceralure, the ethyl 4- and 5-iodo-trans-2-methylcyclohexane-1-carboxylate mixture. 1,1-Dimethylethylcis-5-iodo-trans-2-methylcyclohexane-1-carboxylate (A) and 1,1-dimethylethylcis-4-iodo-trans-2-methylcyclohexane-1-carboxylate (C) were isolated and converted to their ethyl esters, thus supplying the fourtrans-isomers of ceralure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268699
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  • 6
    Electronic Resource
    Electronic Resource
    Utilisation of liquid chromatography in aquatic photodegradation studies of pesticides: A comparison between distilled water and seawater (1990)
    Springer
    Chromatographia 29 (1990), S. 120-124 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Diode array T/mass spectrometry detection ; Atrazine, Diuron and Fenitrothion ; Photodegradation studies in distilled water and seawater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The advantages of liquid chromatography with diode array and mass spectrometric detection are described for the direct characterization of the photodegradation products of Fenitrothion, Atrazine and Diuron in distilled water and artifical seawater samples. The photodegradation (UV λ〉290 nm) of the herbicides Atrazine and Diuron was examined in distilled water and in artificial seawater containing humic acids. Major photodegradation products were hydroxyatrazine and Monuron, respectively. The results showed a faster degradation in seawater as compared to distilled water for Atrazine whereas for Diuron a quenching effect was observed thus retarding photodegradation. The photodegradation of Fenitrothion was also investigated. For this pesticide, hydrolysis predominates in seawater and photolysis is very slow in distilled water, so that acetone was needed as photosensitizer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268696
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  • 7
    Electronic Resource
    Electronic Resource
    Improved HPLC determination of aliphatic amines in air by diffusion and derivatization techniques (1990)
    Springer
    Chromatographia 29 (1990), S. 151-154 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Aliphatic amines in air ; m-Toluoyl derivatives ; Annular denuder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Traces of C1−C4 aliphatic amines, sampled from ambient air on H3PO3-coated annular denuders, are derivatized with m-toluoyl chloride (MTC) in alkaline acetonitrile. The resulting derivatives are determined by reversed phase HPLC with ultraviolet detection at 230 nm. The detection limits of the individual amines are in the 1 to 5 picomole range corresponding to gasphase concentrations lower than 0.1 μg m−3 in air samples collected at 5 Lmin−1 for one hour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268702
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of amino acids in apple extracts by high performance liquid chromatography (1990)
    Springer
    Chromatographia 29 (1990), S. 155-160 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Amino acids ; O-phthaldialdehyde-2-mercaptoethanol ; Apples
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A rapid and sensitive method for the simultaneous determination of primary amino acids in apple is described. After sample preparation, amino acids were derivatized with o-phthaldialdehyde/2-mercaptoethanol and separated on a reversed phase column with a gradient of phosphate buffer-tetrahydrofuran-methanol as the mobile phase. Detection was carried out with a fluorescence detector at excitation and emission wavelengths of 340 nm and 425 nm respectively. Recovery studies showed good results for all substances (91–109%) (with coefficients of variation ranging, from 0.1 to 9.0%). This method was applied to the monitoring of amino acids during the ripening of apples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268703
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis and chromatographic properties of an HPLC chiral stationary phase based upon human serum albumin (1990)
    Springer
    Chromatographia 29 (1990), S. 170-176 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chiral separations ; Human serum albumin on silica ; Protein binding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new HPLC stationary phase was synthesized by thein situ covalent immobilization of human serum albumin (HSA). The protein was immobilized on a commerically available diol column which had been activated with 1,1-carbonyldiimidazole. Initial chromatographic studies show that this phase can be used for chiral separations of enantiomeric solutes and that these separations may reflectin vitro binding to the HSA. The effects of mobile phase composition and temperature on the stereochemical resolutions are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268706
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis of a mixed-functional silica support for direct injection analysis of drugs in serum by liquid chromatography (1990)
    Springer
    Chromatographia 29 (1990), S. 223-227 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Mixed-functional silica ; Direct serum injection ; Drug analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new mixed-functional silica material has been developed for direct injection analysis of drugs in serum. The mixed-functional material is synthesized from porous silica by three steps; introduction of 3-glycidoxypropyl groups, introduction of phenyl groups, and hydrolysis of the oxirane ring to diol groups. The prepared column packing can be used for direct injection analysis of hydrophobic and hydrophilic drugs in serum over the eluent pH range employed for ordinary siloxane-bonded silica. The recovery of drugs from serum was almost 100%, regardless of the difference in their protein bindings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02317908
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