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  • 1
    Electronic Resource
    Electronic Resource
    Universal sample enrichment technique for organochlorine pesticides in environmental and biological samples using a redesigned simultaneous steam distillation-solvent extraction apparatus (1993)
    s.l. : American Chemical Society
    Analytical chemistry 65 (1993), S. 3677-3683 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00072a022
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  • 2
    Electronic Resource
    Electronic Resource
    Activity coefficient of n-heptane in 4,4'-dihexyloxyazoxybenzene liquid crystal (1972)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 76 (1972), S. 596-597 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100648a025
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  • 3
    Electronic Resource
    Electronic Resource
    Resolution of the optical isomers of dansyl amino acids by reversed phase liquid chromatography with optically active metal chelate additives (1979)
    s.l. : American Chemical Society
    Analytical chemistry 51 (1979), S. 433-435 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac50039a026
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  • 4
    Electronic Resource
    Electronic Resource
    Organochlorine pesticide analysis in oil seeds and vegetable oil: simplification of silica gel clean-up and elimination of chlorinated solvents (1996)
    Springer
    European food research and technology 202 (1996), S. 19-23 
    Details
    ISSN: 1438-2385
    Keywords: Organochlorine analysis ; Vegetable oil ; Sample clean-up
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract For the determination of organochlorine pesticides (OCPs) in vegetable oils and oil seed samples, a solid-phase extraction method is described, modified from that developed by Steinwandter, with silica gel columns activated with a 10% water content. In comparison to the method developed by Steinwandter, we reduced the amount of solvents and chemicals required for sample preparation and substituted dichloromethane by the much less toxictert-butylmethyl ether in the eluent mixture. In this manner the sample preparation technique becomes more convenient, cheaper and ecologically more justifiable. Under the specified sample preparation and elution conditions 1 g silica gel retained about 16 mg triglycerides whereas the OCPs were quantitatively eluted. The recoveries for hexachlorobenze, (HCB) α-HCH, Lindane (γ-HCH) γ-HCH, Heptachlor, Heptachlorepoxid,o,p′-DDE,p,p′-DDE, Dieldrin,o,p′-DDT,p,p′-DDT were between 75 and 90%. The reproducibility of the total method was excellent as well as its ruggedness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229678
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of chemically modified silica gels by DRIFT spectroscopy (1988)
    Springer
    Microchimica acta 95 (1988), S. 123-126 
    Details
    ISSN: 1436-5073
    Keywords: diffuse reflectance ; infrared spectroscopy ; quantitative analysis ; HPLC phase characterization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Chemically modified silica gels are investigated with respect to identity, purity and degree of surface coverage using diffuse reflectance FTIR (DRIFT) Spectroscopy. We report the results for two bonded HPLC phases, pyrene butyric acid propylamido- and octadecyl-groups grafted on irregular porous silica gel. For quantitative determination calibration standards are prepared by adsorbing structurally similar ligand compounds onto the surface of the silica gel; these coated materials give linear calibration curves up to a concentration of 1 mmol/g modified silica gel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01349735
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  • 6
    Electronic Resource
    Electronic Resource
    Enantioselective chromatography: Selection of chiral recognition models (1991)
    Springer
    Microchimica acta 104 (1991), S. 113-128 
    Details
    ISSN: 1436-5073
    Keywords: enantioseparation ; liquid chromatography ; chiral recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In this brief overview diverse chiral recognition models and chiral host-guest (selector-selectand, SO-SA) relationships which are used in enantioselective chromatography are discussed. In particular it is focussed on aspects of chiral interactions on (a) small molecular “brush type” chiral stationary phases (CSPs) and on (b) biopolymer and synthetic polymer type CSPs. The importance and the great variability of intermolecular SO-SA bindings via complementary contact sites, also in connection with molecule conformations, is stressed. Some representative and selected examples of chromatographic enantioseparations are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245502
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  • 7
    Electronic Resource
    Electronic Resource
    Heart rate and systolic time intervals in healthy newborn infants: Longitudinal study (1985)
    Springer
    Pediatric cardiology 6 (1985), S. 117-121 
    Details
    ISSN: 1432-1971
    Keywords: Normal neonates ; Right ventricular systolic time intervals ; Left ventricular systolic time intervals ; Heart rate ; Longitudinal study
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary To determine the influence of heart rate (HR) on systolic time intervals (STI) in neonates, serial measurements of right ventricular (RVSTI) and left ventricular systolic time intervals (LVSTI) were made on 30 healthy term newborn infants at age 4–8 h, 24–30 h, eight days, and four weeks. STI was related to HR and age. Age-related changes were similar to previously reported results. The preejection periods (RPEP and LPEP) significantly shortened with increasing age, whereas the right and left ventricular ejection times (RVET and LVET) were unrelated to age. RPEP was unrelated to HR, but tended to be prolonged in restless infants. With increasing HR, RVET decreased and RPEP/RVET increased in all age groups, but less at four weeks. A rise in HR of 50/min resulted in an increase of RPEP/RVET by 26% of the mean value at age 4–8 h and by 20% at four weeks. In 14 infants, RVSTI was recorded during a change in HR. In all these infants, RPEP and RPEP/RVET increased with increasing HR. We conclude that HR-related changes of RVSTI in neonates are different from those in older subjects. It should be considered that in neonates elevated values of RPEP/RVET, suggesting increased pulmonary vascular resistance, may be caused by high HR and unrest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02336549
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  • 8
    Electronic Resource
    Electronic Resource
    Stereoselective hemodynamic effects of (R)-and (S)-propranolol in man (1989)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 339 (1989), S. 474-478 
    Details
    ISSN: 1432-1912
    Keywords: (R)-Propranolol ; (S)-Propranolol ; Betaadrenoceptor antagonists ; Stereoselectivity ; Iodocyanopindolol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a randomized, double-blind, placebo-controlled, cross-over study 24 healthy volunteers were examined before and 2 h after oral administration of 80 mg (R,S)-, 40 mg (R)- and 40 mg (S)-propranolol · HCI; 8 of them received placebo in an additional run. During exercise on a bicycle ergometer and a rest period the rate pressure product was decreased by 80 mg (R,S)-propranolol · HCl (−32.8%p 〈 0.0001) and 40 mg (S)-propranolol · HCl (−32.3%;p 〈 0.0001), whera 40 mg (R)-propranolol · HCl as well as placebo showed no effect. corresponding binding inhibition experiments using (−)-(125I)iodocyanopindolol in a sarcolemma-enriched cardiac membrane preparation yielded a eudismic ratio of 179 for (S)- over (R)-propranolol. 2 h after oral application, stereospecific HPLC analysis revealed different individual concentrations in plasma of (R)-(22.3 ± 21.7 ng/ml) and (S)-propranolol (30.4 ± 26.9 ng/ml) when 80 mg of (R,S)-propranolol · Hcl was administered. The plasma levels were similar when 40 mg of the pure enantiomer of (R)- (22.7 ± 20.3 ng/ml) or (S)-propranolol · HCl (28.7 ± 22.5 ng/ml) was applied. (R)- and (S)-propranolol are two substances with different pharmacodynamic and pharmacokinetic properties. As there are methods available to produce the optically pure enantiomers, they should be used rather than the racemic mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00736064
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  • 9
    Electronic Resource
    Electronic Resource
    Tartaric Acid Chloralides: Isolation and X-ray Analysis of the Third Existing Stereoisomer. Force-Field and AM1 Calculation of all Six Possible Structures (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1203-1205 
    Details
    ISSN: 0009-2940
    Keywords: AM1 calculations ; Chloralide ; Dioxolane ; Force-field calculations ; Tartaric acid ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Isolation of a third diastereoisomer (1c) of (R,R)-tartaric acid chloralide is described. A comparison of structural data derived by X-ray analysis with calculated parameters is given. Structures are generated by the ALCHEMY force-field program as well as by AM1 calculations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220629
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  • 10
    Electronic Resource
    Electronic Resource
    Quantification of midodrine and its active metabolite in plasma using a high performance liquid chromatography column switching technique (1989)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 3 (1989), S. 153-156 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: An automated column-switching HPLC system is described for the simultaneous determination of midodrine, an alpha-adrenergic stimulating drug, and its active metabolite, ST-1059. Serum or plasma (850 μ L) is directly injected onto a RP 18 (30 μm particle size) pre-column (9 × 4 mm ID) which acts as an on-line liquid-solid extractor and analyte enrichment system. The injection is followed by washing steps. The fraction containing the analytes is transferred onto an analytical RP18 column via step gradient elution where the final analysis is performed. Fluorescence detection is used (λex 290 nm and λem 322 nm), and method detection limits of 0.8 ng/mL plasma were reached. These were sufficiently low to determine the plasma concentration-time profiles for both compounds following oral administration of 2.5 mg and 5 mg midodrine hydrochloride. The assay in serum or plasma was linear in the range of 1 to 15 ng analyte/mL, the recovery was 〉95%, and the reproducibility was sufficient. The assay was rugged and was maintained by routinely changing the home-made, dry packed pre-column every 20th serum injection.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130030403
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