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  • Column liquid chromatography
  • Springer  (28)
  • Nature Publishing Group
  • Public Library of Science (PLoS)
  • 1980-1984  (28)
Collection
Keywords
Publisher
  • Springer  (28)
  • Nature Publishing Group
  • Public Library of Science (PLoS)
  • Wiley-Blackwell  (1)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Liquid chromatography of isomers of aromatic acids on microbore column packed with anion-exchange resin (1984)
    Springer
    Chromatographia 18 (1984), S. 633-636 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Aromatic acid isomers ; Low capacity ion-exchange resin ; Microbore packed columns
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A low-capacity, anion-exchange, porous-polymer resin was used as the packing material in a microbore column. Using a phosphate buffer containing various organic modifiers, retention behavior of substituted benzoic acid isomers with amino, chloro, methyl, nitro and carboxylic groups was investigated. The effect of ethanol, acetonitrile and sodium dodecylsulfate used as organic modifiers on the retention behavior at various eluent pH values was studies and optimum separations of the positional isomers reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02261979
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of pressure on sorption equilibrium: HPLC column packing-mixed eluent (1984)
    Springer
    Chromatographia 18 (1984), S. 668-672 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Mixed eluents ; Preferential sorption of eluents ; Pressure effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Pronounced base line perturbations were repeatably observed in LC both in alternating recycling and in backflushing experiments when binary eluents and refractometric detectors were used. The perturbations which we call eigenzones appeared immediately after operating the recycling or the backflushing valve, and their size and shape depended on the nature of both the column filling and the mixed mobile phase as well as on the pressure drop across the column. Experimental results presented confirm that the primary causes of the eigenzones were the pressure changes in the columns which influenced the sorption equilibrium of mixed eluent components within the column packing. Some practical consequences of this effect are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265811
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of stationary phase properties and solute molecular size on retention of PAHs in reversed-phase liquid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 677-679 
    Details
    ISSN: 1612-1112
    Keywords: Polycyclic aromatic hydrocarbons ; Column liquid chromatography ; Polyphenyl bonded phases ; Retention and carbon content
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The relationship between the retention of PAHs having various molecular sizes and the carbon contents (%) of bonded stationary phases with various types of ligands were investigated. The examined stationary phases were phenyl, diphenyl, triphenyl and benzyl-bonded silicas. The data indicated that sometimes it is not true that the retention of any solute relates linearly to the carbon content of the stationary phase. As the result, it is suggested that the pore size distribution of the silica support, the bulkiness of the ligand bonded to the silica and the molecular size of solute should also be considered before any precise statement can be made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265813
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  • 4
    Electronic Resource
    Electronic Resource
    Implications of on-line FTIR detection in the separation of coal-derived products via HPLC with polar modifiers (1984)
    Springer
    Chromatographia 18 (1984), S. 175-182 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Fourier transform IR ; Polar compounds ; Coal products
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Fourier-transform infrared spectrometry (FTIR) was utilized as a detection system for high-performance liquid chromatography of polar compounds on a normal bonded-phase system. In addition to FTIR, UV (254 nm) and refractive index detection were employed in the separation of model compounds containing oxygen and nitrogen atoms in their molecules (phenols, alcohols, neutral and weakly basic nitrogen compounds). A polar amino-cyano (PAC) bonded-phase column was employed with a binary mobile phase (98:2 CDCl3:CH3CN). The separations and the information gained from each detector is discussed, including interactions between sample material and mobile phase. A polar fraction of a coal-derived product is also chromatographed under identical conditions. The results based on FTIR detection and chromatographic retention behavior suggest the exclusive presence of hindered and unhindered phenols.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02276729
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  • 5
    Electronic Resource
    Electronic Resource
    Microcomputer-assisted retention prediction system in reversed-phase HPLC (1984)
    Springer
    Chromatographia 18 (1984), S. 211-215 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Alkylbenzenes ; PAHs ; Retention prediction ; Microcomputer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The microcomputer-assisted retention prediction system in C18 reversed-phase HPLC is described. The system is based on the use of the hydrophobic parameter and the correlation factor of alkylbenzenes and polycyclic aromatic hydrocarbons (PAHs) which are highly correlated to their retention in reversed-phase HPLC. The system is evaluated by comparing the retention data between measured and predicted values. One of the typical examples applied for PAH analysis in the extracts of diesel particulate matter shows the high potential of the system investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02276735
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  • 6
    Electronic Resource
    Electronic Resource
    The synthesis and characterization of aliphatic sulfonic acid cation exchangers for HPLC (1984)
    Springer
    Chromatographia 18 (1984), S. 216-220 
    Details
    ISSN: 1612-1112
    Keywords: Cation exchangers ; Column liquid chromatography ; Exchange capacity, determination ; Organic peroxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Two oxidation procedures for the synthesis of silicabased aliphatic sulfonic acid cation-exchangers for HPLC are described. Several reaction conditions for oxidizing a terminal-bonded thiol with organic peroxides are provided along with their yields, capacities, reproducibility, and chromatographic behavior. Also, three methods for determining exchange capacity are discussed, and their relationship to the capacity factors of charged solutes is compared. The maximum capacity determined by the titration of the bonded silica was 0.34 meq/gram. The general problems of synthesizing cation-exchangers, measuring their efficiencies and exchange capacities, and evaluating their overall performances are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02276736
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  • 7
    Electronic Resource
    Electronic Resource
    Equilibria effects in the dynamic ion-exchange separation of metal ions (1984)
    Springer
    Chromatographia 18 (1984), S. 369-373 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion exchange ; dynamic ; Metal ions ; Equilibria effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Equilibria occurring during the dynamic ion exchange separation of metal ions were examined, and their effect on the chromatography of the metal ions was evaluated. Bonded reversed-phase silica, pure organic reversed phase, and silica columns were used to differentiate between the role of silica and the reverse phase. The results show that system peaks had the most important influence on the applicability of dynamic exchangers to quantitative metal ion determinations. The response of system peaks to sample composition (pH, ionic strength, matrix effects) was complicated and could not be predicted easily. Equilibria effects that can cause analytical errors were identified and recommendations for elimination of such errors are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262483
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  • 8
    Electronic Resource
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    Detectability of phenols and amines by normal phase microbore HPLC-FTIR employing hihgly IR transparent solvents (1984)
    Springer
    Chromatographia 18 (1984), S. 396-400 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Amines ; Phenols ; Fourier transform I.R.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Several chromatographic parameters have been examined as to their effect on detectability for microbore high-performance liquid chromatography coupled with Fourier-transform infrared spectrometry. Detection limits for several compound classes are presented as amount injected. Improvements in detectability for this technique are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262489
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of thiamine and thiamine phosphates as thiochrome derivatives by reversed-phase chromatography on polystyrene packing materials (1984)
    Springer
    Chromatographia 18 (1984), S. 424-426 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Polystyrene packings ; Pre-column derivatization ; Thiamine compounds ; UV and fluorescence detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The chromatography of thiochrome and related phosphate esters was studied on two different polystyrene packing materials. The adsorbents were compared with respect to capacity factors, plate heights and resolution factors measured with different mixtures of phosphate buffer (pH 8.5) and methanol. In contrast with derivatized silica, these phases were found to be stable using an alkaline mobile phase and sample. Fast separations were possible with good peak symmetry at all organic modifier concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262970
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  • 10
    Electronic Resource
    Electronic Resource
    HPLC-analyses of plant biomass hydrolysis and fermentation solutions (1984)
    Springer
    Chromatographia 18 (1984), S. 445-448 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Amino-bonded stationary phase ; Ion-exchange ; Fermentation solution ; Biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In this work the analytical separation of biomass hydrolysis and fermentation products is described. Aminobonded phase and ion exchange materials (HPX 87H, HPX 42A, μ Spherogel Carbohydrate) were used as HPLC stationary phases for the determination of monomeric and oligomeric carbohydrates, carbohydrate degradation and fermentation products. The HPX 42A and the amino-bonded phase columns are especially suitable for the analysis of the gluco oligomers. The HPX 87H column separates the monomeric sugars and their degradation and fermentation products (e.g. furfurals and ethanol) very well. Using the μ Spherogel Carbohydrate column the lower gluco-oligomers as well as the monomeric sugars and their degradation and fermentation products, can be determined within 35 minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262975
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  • 11
    Electronic Resource
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    High-performance liquid chromatographic resolution of enantiomers on chiral amine-bonded silica gel (1984)
    Springer
    Chromatographia 18 (1984), S. 459-461 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Chiral bonded phase ; Racemate resolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A chiral stationary phase with an immobilized, optically active diamine was prepared for the separation of enantiomers. The synthesis of the phase was carried out by bonding (−)trans-1,2-cyclohexanediamine to microparticulate silica gel through the coupling agent 3-glycidoxypropylsilane. The resolution of the racemic compounds catechin, 2,2′-dihydroxy-1,1′binaphthyl and trans-1,2-cyclohexandiol, is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262978
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  • 12
    Electronic Resource
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    Molecular-shape recognition of polycyclic aromatic hydrocarbons in reversed phase liquid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 495-498 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; PAHs ; Molecular shape recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The molecular-shape recognition of polycyclic aromatic hydrocarbons has been studied on various stationary phases in reversed-phase high-performance liquid chromatography. The examined stationary phases were phenyl-, diphenyl-, triphenyl- and benzyl-bonded silicas. The results of regression analysis inidcated that triphenylsilica is the best packing material to recognize the difference in the molecular-shape of structural isomers. This fact was confirmed by the separation of 4-ring isomers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267234
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  • 13
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    Effect of the chain length of chemically bonded phases on the retention of substituted benzene derivatives in reversed-phase liquid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 499-502 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Retention data ; Substituted benzene derivatives ; Correlations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The capacity factors of substituted benzene derivatives on bonded phases of various chain lengths in the reversed-phase mode have been measured and correlation of retention data between four stationary phases has been investigated by linear regression analysis. As a result, a difference in the retention mechanism between phases of shorter chain length and octadecylsilica was observed. In addition, it is also apparent that the multicombination treatment between retention data and descriptors such as π, HA, HD and σ promises the possibility of predicting the retention of substituted benzene derivatives on various reversed-phase stationary phases.
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    URL: http://dx.doi.org/10.1007/BF02267235
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  • 14
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    High-speed analysis of dansyl derivatives of polyamines (1984)
    Springer
    Chromatographia 18 (1984), S. 525-527 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Polyamines ; Dansyl derivatives ; Peak compression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Analytical conditions for the high-speed, reversed-phase, liquid chromatographic of a diamine (putrescine) and polyamines (spermine and spermidine) were determined. Various elution modes were employed using the same mobile phase constituents: 20mM sodium heptane sulfonate and 20mM acetic acid as solvent A and, pure acetonitrile as solvent B. Samples were derivatized with dansyl chloride before injection. Under isocratic conditions, the separation of the three polyamines was achieved in 7 min. The use of a linear elution gradient led to the same analytical time but with a better resolution of the putrescine peak from non-polyamine frontal peaks. For these measurements, the sample size was 5μl. This volume was increased to 20μl and the use of a steep gradient combined with the peak-compression technique allowed a fast analysis in 2–3 minutes, which may be compared with a 30 min run time necessary when a conventional column is used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02267240
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  • 15
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    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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  • 16
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    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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  • 17
    Electronic Resource
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    Microbore columns in quantitative column liquid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 574-578 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Microbore column ; Flow rate stability ; Performance ; Quantitative analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Some quantitative implications of the use of microbore columns in column liquid chromatography are investigated. Although for several pumps the flow rate stability at 50 μl min−1 is slightly worse than that of pumps operating at 1 ml min−1, the quantitative performance with respect to repeatability and reproducibility of response factors equals that of conventional liquid chromatography. Thermostatting is strongly recommended for microbore column operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265697
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  • 18
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    High-speed assay of amino acids using reversed-phase liquid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 62-64 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Reversed phase ; Microparticulate packing ; Amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A procedure is described by which 20 commonly occurring amino acids may be separated by reversed-phase liquid chromatography at room temperature in a total time, including derivatisation with o-phthalaldehyde/2-mercaptoethanol reagent, of approximately 15 minutes. Further, an increase in column temperature enables increased resolution of certain amino acids to be obtained with small but acceptable losses in fluorescence intensity. The only major drawback to the method is that the derivatisation reagent does not react with proline or hydroxyproline.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268457
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  • 19
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    Ion pair chromatography: A new approach to dynamic equilibrium (1984)
    Springer
    Chromatographia 18 (1984), S. 15-17 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion-pair ; Dynamic equillibrium ; Aqueous and aqueous alcohol eluents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This work describes the dynamic equilibrium of an ionpair, reverse-phase liquid chromatography system. A given adsorbed quantity of an anionic surfactant can lead to different capacity factors and selectivity for anionic solutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279456
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  • 20
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    Correlation of the retention data of polyaromatic hydrocarbons obtained on various stationary phases used in normal- and reversed-phase liquid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 44-46 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Retention correlation ; Silica ; Normal and reversed phase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The correlation between the retention data of polyaromatic hydrocarbons (PAH) obtained in normal-and reversed-phase liquid chromatography is investigated in order to determine the dominant factors controlling the retention. It is clear that the separation of PAHs on various chemically-bonded packing materials in normal- and/or reversed-phase modes is primarily controlled by the molecular structure and shape. The π-electron interaction between the solute and the stationary phase also contributes to the retention, although pure silica shows a somewhat different behavior.
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    URL: http://dx.doi.org/10.1007/BF02279465
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  • 21
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    High-performance liquid chromatography of sugars on copper (II) modified silica gel (1984)
    Springer
    Chromatographia 18 (1984), S. 600-602 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Sugars ; Copper (II) complex ; UV detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A sensitive method of sugar analysis by HPLC is described in which a copper (II) modified silica gel as stationary phase is used. Detection is based on UV absorption of a complex formed between the sugar, copper, and ammonia.
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    URL: http://dx.doi.org/10.1007/BF02261971
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  • 22
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    An investigation into the use of semi-microbore reverse-phase 3 μm columns in HPLC (1984)
    Springer
    Chromatographia 18 (1984), S. 695-697 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Semi-microbore columns ; Reverse-phase ; 3 μm packing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The preparation and use of semi-microbore (2mm i.d.), reverse-phase columns in HPLC has been investigated and they have been compared with 5 mm bore analytical columns. Injection valve design, detector cell volume, column loading and column linking are considered for both semi-microbore and analytical systems. Mobile phase flow-rate, detector time constant and column lifetime are also evaluated for small-bore systems.
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    URL: http://dx.doi.org/10.1007/BF02265817
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  • 23
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    Quantitative determination of trace amounts of L-alanine in triglycine sulphate crystals by HPLC (1984)
    Springer
    Chromatographia 18 (1984), S. 701-703 
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    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Quantitative determination of L-alanine ; DABS-Cl ; Tryglycine sulphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method for the quantitative determination of L-alanine in triglycine sulphate crystals, in the presence of excess amounts of glycine, is described. L-alanine is determined after derivatization with 4-N,N-dimethyl-aminoazobenzene-4′-sulfonyl chloride (DABS-Cl) and in the presence of DABS-valine used as the internal standard. The results obtained indicate that the method permits the determination of alanine in triglycine sulphate crystals at concentrations of about 1%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265819
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  • 24
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    Packing and performance of microbore columns for adsorption and partition chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 73-80 
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    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Microbore columns ; Performance ; High-speed separation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Microbore columns of 1 mm i.d. have turned out to be very suitable for the achievement of efficient columns. The packing procedure for stainless steel 1 mm i.d. columns from 5 to 100 cm in length was studied. Stationary phases used were: pure silica gel, octyl, octadecyl and amino bonded silicas. The main parameters (slurry composition, packing system, choice of materials) are discussed. Short columns packed with 3 or 5μm particles allow high speed separations. A separation in 18 seconds is described. Very high plate numbers can be obtained with long columns. With 7–8μm particles, a 1 m column can produce 50,000 plates (h=3). Columns can be joined without loss of efficiency. 270 000 theoretical plates were obtained on a 6 m adsorption column with a test mixture. In reversed-phase chromatography, bile acid sodium salts can be separated on a 1 m column. In adsorption chromatography, details are given of the separation of a polystyrene oligomer sample, as well as a light and a heavy petroleum distillate samples on a 2 m column with refractive index detection in the last-case.
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    URL: http://dx.doi.org/10.1007/BF02268460
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  • 25
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    The evaluation of “reversed phase” high-performance liquid chromatography packing materials (1984)
    Springer
    Chromatographia 18 (1984), S. 84-86 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Reversed phase ; Stationary phase evaluation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary For the evaluation of reversed phase packing materials a mixture of acetylacetone, I-nitronaphthalene and naphthalene is proposed. This will reveal the usual optimum kinetic chromatographic parameters (the naphthalene peak), the degree of activity or endcapping status of the column (the ratio of the I-nitronaphthalene and naphthalene retention times) and trace metal activity (the shape and intensity of the acetylacetone peak).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268462
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  • 26
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    A simple test to characterise C8/C18-bonded phases, particularly for toxicological screening (1984)
    Springer
    Chromatographia 18 (1984), S. 81-83 
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    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Bonded phases ; Characterisation ; Toxicological screening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This paper describes a test (“DMD-test”) to determine chromatographic properties of C8- or C18-bonded phases. The test was developed to select HPLC columns, for clinical and forensic toxicological screening in particular. The three compounds for the DMD-test are: diphenhydramine, 5-(p-methylphenyl)-5-phenylhydantoin (=MPPH) and diazepam. The isocratic mobile phase (acetonitrile/buffer pH2.3) is suitable for analysis of biological samples. 24 commercially available columns were tested. From our work this test enables the selection of commercial HPLC columns with reproducible properties. In this way a reference LC retention list can be developed to identify analytical results on an inter- or intralaboratory basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268461
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  • 27
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    Retention prediction of substituted benzenes in reversed-phase HPLC (1984)
    Springer
    Chromatographia 18 (1984), S. 90-95 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Reversed phase ; Retention prediction ; Substituted benzenes ; Molecular parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The separation of substituted benzene derivaties on a reversed-phase C-18 column has been examined. The correlations between the logarithm of the capacity factor and several descriptors indicating the molecular size, shape and the physical properties of a solute were determined. The results indicated that hydrophobicity is the dominant factor to control the retention of substituted benzenes. Their retention in reversed-phase HPLC can be predicted with help of the equations derived by multicombination of the parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268464
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  • 28
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    Electronic Resource
    Air-sampling of aldehydes—Application to chromatographic determination of formaldehyde and acetaldehyde (1984)
    Springer
    Chromatographia 18 (1984), S. 137-144 
    Details
    ISSN: 1612-1112
    Keywords: Aldehydes and ketones ; 2,4-dinitrophenylhydrazine-coated silica gel ; Gas chromatography ; Column liquid chromatography ; Pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary After a brief review of several methods described in the literature this paper discusses air-sampling on 2,4-dinitrophenylhydrazine-coated silica gel and identification requirements for aldehydes and ketones most commonly found in industrial pollution. Quantitative analysis of formaldehyde and acetaldehyde either by GC or by HPLC techniques is established using a dynamic system producing test atmospheres and compared with the usual colorimetric determinations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02258770
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