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  • 1990-1994  (5)
  • 1955-1959
  • 1920-1924
  • Analytical Chemistry and Spectroscopy  (3)
  • Rheumatoid Arthritis  (2)
  • 1
    ISSN: 1434-9949
    Keywords: Rheumatoid Arthritis ; Alpha-1-Acid-Glycoprotein ; Synovial Fluid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Microheterogeneity of alpha-1-acid glycoprotein was studied using affinity immunoelectrophoresis with concanavalin A as a ligand in the samples of serum and synovial fluid obtained at the same time from 22 patients with rheumatoid arthritis. Individuals with intercurrent infection or other illnesses were excluded from the study. The results were expressed as reactivity coefficient (RC). Disease activity was evaluated by Mallya-Mace Activity Score, Lansbury Joint Index and laboratory tests. In most of the studied samples the glycosylation pattern was similar, composed of a nonreactive variant and 2 reactive (the first and the second) with Con A variants. In seven samples of synovial fluid an extra third peak representative of the strongly reactive one with Con A fraction was observed. It was the cause of the remarkable elevation of AGP-RC. Moreover, the level of IgM and IgA RF was higher in the synovial fluid derived from these patients — with the presence of the third peak in AFF-EP with Con A — than in those without the considered fraction.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-9949
    Keywords: Auranofin ; Gold Sodium Thiomalate ; Rheumatoid Arthritis ; Treatment ; Long-term Treatment ; Gold Salts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary One hundred twenty-one patients with active RA were randomly assigned to receive 6 mg auranofin (AF)/day (60 patients) or 50 mg gold sodium thiomamate (GST)/week (62 patients) in a double-blind fashion. There were no intergroup differences with respect to sex, age, duration (median 2 years), stage and activity of the disease. In the case of “striking improvement” after 24 weeks a dose reduction to 50 mg GST/month or 4 mg AF/day was allowed and carried out in all GST patients and no AF patient. The serum gold levels were 5 times higher with weekly GST, they approached those of the AF group with monthly GST injections. The clinical parameters — number of swollen joints, activity index, articular index, grip strength, ESR — improved significantly in both groups, but grip strength, articular index and ESR improved more pronounced in the GST group. The X-ray progression (hands and forefeet) was significantly greater in the AF group. Fourthy eight AF patients (80%) and 39 GST patients (36%) completed the first year. Thereafter the study was continued as an open study but the patients were allowed to switch from GST to AF. After the first and second year 14/7 GST patients switched to AF. The second/third year was completed by 37/22 AF pat. (62%/37%) and by 15/8 GST pat. (24%/13%). Skin reactions were more common with GST (41.9%/26.7%), diarrhoea was more common with AF (36.7%/19.4%), proteinuria occurred in 10% in both groups, leucopenia and thrombocytopenia were rare in both groups (1.7%). The withdrawal rate due to adverse events was 10%/26% in the AF/GST group during the first year (p〈0.05) and 25%/32% over the three year period (n.s.). Conclusion Both AF and GST are effective in the long-term treatment of RA, but GST is more so in radiological progression and ESR.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 692-694 
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Electrospray mass spectrometry has been applied to ionic inorganic systems such as heteropolyacids in methanol + water (1/1) or acetonitrile + water (1/1) solutions. Negative-ion mass spectra were obtained on four different heteropolyacids. Heteropolymolybdates H3PMo12O40 and H4PMo11VO40 and heteropolytungstates H3PW12O40 and H4SiW12O40 gave ions with different charges. H3PMo12O40 gave ions of m/z 1822, 912 and 608 which correspond respectively to [PMo12O403- + 2H+], [PMo12O403- + H+]2- and [PMo12O40]3- ions. Resolution of 1:2200 has demonstrated the charge of each ion acquired. Furthermore, the isotope distribution of the observed ions was in good agreement with theory. Thus, electrospray mass spectrometry has become a powerful soft ionization technique for the analysis of such ionic compounds, provided they are soluble and stable in the solvent system used.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Until the present, analysis of aqueous solutions of atrazine has been conducted using a combination of liquid chromatography or gas chromatography with mass spectrometry, after a preconcentration step. We explore herein a new approach for studying support-phase-extracted atrazine and hydroxyatrazine samples. Solid-phase extraction membranes are inserted directly into the cell of a Fourier-transform mass spectrometer for analysis after laser ionization. It appears that atrazine and its metabolite have very different ionization processes. In the case of hydroxyatrazine, the [M + H]+ ion signal can be correlated to the concentration of the extracted solution. These encouraging results might open the route to a quantification method.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0749-1581
    Keywords: 27 Al MAS NMR ; Quadruopolar interaction parameters ; Isotropic chemical shfits ; Spectral simulation ; Al2Ge2O7 ; LaAlGe2O7 ; Pentacoordinated aluminium environment ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Characterization by 27Al MAS NMR of two pentacoordinated environments of aluminium has been carried out in different fields and at different spinning speeds for Al2Ge2O7 and LaAlGe2O7. Complete simulations of the spectra have been performed, including computation of the individual shape and intensity of each spinning side band, which lead to the determination of both the quadrupolar interaction parameters and isotropic chemical shifts, and enable the detection of impurities in the material. The parameters determined are: .
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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