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  • Analytical Chemistry and Spectroscopy  (1)
  • HPLC  (1)
  • Organic Chemistry  (1)
  • 2005-2009
  • 1985-1989  (2)
  • 1970-1974  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 33 (1987), S. 293-296 
    ISSN: 1432-1041
    Keywords: falciparum malaria ; quinine ; acute renal failure ; HPLC ; haemofiltration ; plasma levels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The monitoring of quinine by HPLC in 3 patients suffering from cerebral malaria with acute renal failure and treated by haemofiltration is reported. The recommended dose of quinine in this situation is reduced to 10 to 15 mg·kg−1·day−1. However, in the first patient, when given quinine 10 mg kg−1·day−1 the plasma concentration was mainly below the recommended therapeutic range of 5 to 15 mg/l. In consequence, the dose of quinine in the second patient was elevated to quinine dihydrochloride 15.1 mg·kg−1·day−1 which produced plasma concentrations in the low therapeutic range. In the third patient, an unreduced dose of quinine dihydrochloride 25.7 mg·kg−1·day−1 was employed, resulting in plasma concentrations above 15 mg/l, which is generally assumed to be toxic, although, no sign of acute quinine toxicity was seen. The antimalarial effect in all three patients was satisfactory. Quinine was estimated in the haemofiltrate in two patients and was found to be below the limit of sensitivity (0.25 mg/l). Plasma quinine did not change during or shortly after haemofiltration. It is concluded that in case of acute renal failure in cerebral malaria the dose of quinine should be reduced, but that the common recommendation of 10 to 15 mg·kg−1·day−1 may be too low, and that haemofiltration has no marked influence on the total body clearance of quinine.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 10 (1987), S. 548-552 
    ISSN: 0935-6304
    Keywords: Glass capillary gas chromatography ; Immobilization ; OV-240-OH cyanopropylpolysiloxane ; Isomer specificity ; Polychlorinated dibenzo-p-dioxins ; Polychlorinated dibenzofurans ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Glass capillaries were leached, dehydrated, persilylated with 1, 3-bis (3-cyanopropyl) tetramethyldisiloxane, and coated with OV-240-OH. After crosslinking and binding the phase to the glass surface the columns showed high separation efficiency, high temperature stability, and inertness comparable to persilylated apolar columns. Column performance is shown to be superior to liquid phase cyanopropyl columns such as SP 2330. The excellent separation capabilities together with the selectivity of the phase makes OV-240-OH coated columns a valuable tool for the determination of toxic isomers in complex mixtures of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs). The order of elution of individual TCDD isomers was found to be similar to that described for SP 2330 or Silar 10c. The detection of PCDDs and PCDFs in a fly ash extract further illustrates the utility of OV-240-OH coated columns. The high temperature limit of these columns opens the way for the analysis of high boiling compounds such as mixed brominated/chlorinated dibenzo-p-dioxins and dibenzofurans.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 964-973 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In a search for a new and efficient synthesis of the compound 7, the cyclization of 5 (obtained by a Michael-reaction from 3 and 4) was studied. Treatment of 5 with strong acid furnished the known dienedione 8. Mild acidic conditions gave the bridged alcohol 9 and other, unidentified products, rather than the desired enone 6. Under basic conditions, 5 did not cyclize to 6, but underwent retro-Michael reaction. Attempts were then made to convert the dienedione 8 to the 14α-enone 19. However, both catalytic hydrogenation and lithium-ammonia reduction of 8 yielded mainly 14β-products. In some hydrogenation experiments, isomerization of the dienedione 8 to the phenols 13 (major) and 14 (minor) occurred. The stereochemistry of the new isomeric des-A-androst-9-en-5, 17-diones (16, 17 and 20) was determined by chemical and spectroscopic methods.
    Type of Medium: Electronic Resource
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