Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Flow-injection spectrophotometric determination of palladium with DCS-arsenazo
    Amsterdam : Elsevier
    Analytica Chimica Acta 256 (1992), S. 113-116 
    Details
    ISSN: 0003-2670
    Keywords: Flow system ; Palladium ; Spectrophotometry
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0003-2670(92)85335-4
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Influence of sample injection time of ions on migration time in capillary zone electrophoresis
    Amsterdam : Elsevier
    Journal of Chromatography A 677 (1994), S. 159-167 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9673(94)80555-5
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The use of β 2 H , α 2 H to measure hydrogen-bond terms in reserved phase liquid chromatography (1993)
    Springer
    Chromatographia 35 (1993), S. 111-113 
    Details
    ISSN: 1612-1112
    Keywords: Reversed-phase liquid chromatography ; Solvation energy relationships ; Capacity factors ; Hydrogen-bond terms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In the correlation of reversed phase liquid chromatography capacity factors through the equation $$Log k' = log k'_0 + mV_1 /100 + s\pi _2^ * + b\beta _2 + a\alpha _2 $$ the use of Abrahams β 2 H , α 2 H , which are Gibbs-energyrelated via equilibrium constants (log K b H , K a H ), is entirely equivalent to the use of Kamlet-Tafts β2, α2 for the hydrogen bond terms. It is shown that for most compounds, these two sets of basicity, (β 2 H and β2, are close.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02278567
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Stability of immobilized R. oryzae in repetitive batch productions of L(+)-lactic acid: effect of inorganic salts (1998)
    Springer
    Bioprocess engineering 19 (1998), S. 155-157 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Rhizopus oryzae was immobilized in polyurethane foam cubes by a natural attachment method. The effect of inorganic salts on the stability of the immobilized mycelium in repetitive batch productions of L(+)-lactic acid was studied. The amount of the inorganic salts necessary to maintain the activity of the immobilized R. oryzae in the repetitive batch fermentations strongly depended upon the initial glucose concentrations. For example, the amount of the inorganic salts should be doubled if the initial glucose concentration was twice increased. The minimum amounts of the inorganic salts were therefore determined for effective lactic acid productions in the repetitive batch fermentations with the immobilized R. oryzae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009005
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Characteristics of immobilized Rhizopus oryzae in polyurethane foam cubes (1996)
    Springer
    Biotechnology techniques 10 (1996), S. 809-814 
    Details
    ISSN: 1573-6784
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Rhizopus oryzae was immobilized in polyurethane foam cubes. The effects of the cube size on cell immobilization, cell growth and L(+)-lactic acid production were studied. By the natural attachment method, R. oryzae could be easily immobilized in the polyurethane foam cubes larger than 2.5 × 5 × 5 mm3. The use of small cubes for R. oryzae immobilization was very effective to increase the productivity of L(+)-lactic acid by the immobilized cells. Although it was difficult for smaller cubes to be completely full of the mycelia, increasing the inoculum size in immobilizations was effective to increase the immobilization ratio (a ratio of the number of the cubes containing cells to the total number of cubes).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154663
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Separation and determination of 10-hydroxy-2-decenoic acid in royal jelly by capillary electrophoresis (1995)
    Springer
    Chromatographia 41 (1995), S. 605-609 
    Details
    ISSN: 1612-1112
    Keywords: Capillary electrophoresis ; 10-Hydroxy-2-decenoic acid ; Royal jelly
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The application of capillary electrophoresis (CE) to the separation and determination of the active ingredient, 10-hydroxy-2-decenoic acid, in royal jelly with direct on-column UV detection at 214 nm is described. Using a cathodic injection and anodic detection scheme, 10-hydroxy-2-decenoic acid (10-HDA) was separated and detected in less than 10 min in a fused silica capillary column with a phosphate buffer at pH 7.3 with an applied voltage of 20 KV followed by direct UV detection. The use of cetyltrimethylammonium bromide (CTAB) as electroosmotic flow modifier allows the rapid separation of 10-HDA from other constituents in royal jelly by reversing the direction of electroosmotic flow. The influence of organic solvents in the electrolyte on separation selectivity is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02269727
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Rapid reversed-phase chromatographic separation and determination of selenum and tellurium (1989)
    Springer
    Chromatographia 27 (1989), S. 292-296 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Selenium(IV)-tellurium(IV) separation ; Flow-through coulometric detector
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The chromatographic behaviour of selenium and tellurium has been investigated with two different reversed-phase chromatographic methods, using P-350 (methyl-bi-isooctyl phosphate) and TBP (tributyl phosphate) as the stationary phases. HCl, HBr, NaCl and NaBr were employed as mobile phase components in both methods. The results suggested that the separation mechanism corresponds to the formation of TeCl (or TeBr) and P-350H (or TBPH) ion associate. A coulometric flow-through detector was applied to determine Se(IV) and Te(IV). Complete separation and quantitative determination of Se and Te could be achieved in 10 minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02321271
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Phenylalanine as eluent for indirect photometric detection (1990)
    Springer
    Chromatographia 29 (1990), S. 131-134 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Ion chromatography ; Indirect photometric detection ; Phenylalanine ; Alkali metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In this paper the use of phenylalanine as eluent for indirect photometric chromatography is reported. The effects of the mobile phase pH, phenylalanine concentration etc. on the eluent strength and the sensitivity of detection are discussed. Using 3 mM aqueous solution of phenylalanine at pH 3.0 containing 1% methanol as the mobile phase, a mixture of alkali metals was separated and sodium ion concentration in water was determined on a low-capacity cation-exchange column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02268698
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    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
    Keywords: Column liquid chromatography ; Substituted benzenes ; Solubility parameter ; Substituent constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02271054
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Relationship between retention behavior and molecular structure in HPLC. Correlation between solubility parameter and molecular properties (1994)
    Springer
    Chromatographia 38 (1994), S. 599-608 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Solubility parameters ; Structure parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The application and significance of the solubility parameter are detailed for chromatographic systems. A critical review of the general concept and several empirical and semi-empirical equations for the solubility parameter are reported. Using the basic theory and a systematic study of the main factors affecting total (or expanded) solubility parameters (δT) along with boiling points and molar volumes, we found correlations between four kinds of solubility parameter obtained by different methods, which unify their calculation and establish an equation for the calculation of δT, successfully applying it to retention prediction in GC and LC. The results show our approach is more accurate and simplifies to a two-parameter model involving fundamental physicol-chemical parameters. In addition, the variation of δT with the carbon number of homologous series was investigated, mathematical models were derived by multi-regression analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02277161
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...