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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 224 (1986), S. 419-422 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Lipid solubility is a major determinant of permeability across the blood-brain barrier, to which the blood-retinal barrier (BRB) has many similarities. Carboxyfluorescein is a dye with about 1/1000 the lipid solubility of fluorescein, but their molecular sizes and spectral characteristics are similar. We studied the importance of lipid solubility in BRB permeability by comparing the BRB permeabilities to these two dyes. Dye in the vitreous and plasma of four monkeys was measured by fluorophotometry. The estimated inward permeability coefficients (P in) were 11 ± 7.4 × 10−6) cm/min (mean and SD) for carboxyfluorescein and 21 ± 5.9 × 10−6 cm/min for fluorescein. The ratio of the means was 1/1.9, far from the expected 1/1000. This finding suggests that the BRB does not function as a continuous lipid membrane and that other factors are more important determinants of permeability for these dyes than lipid solubility.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 227 (1989), S. 114-117 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Systemically administered fluorescein (F) is rapidly transformed to the fluorescent metabolite fluorescein glucuronide (FG). Little is known about how diseases can influence the synthesis or disposition of FG. We studied F and FG in the plasma ultrafiltrate of 75 people who were normal or had diabetes, retinitis pigmentosa, or idiopathic rhegmatogenous retinal detachment. F and FG were determined by high-performance liquid chromatography. The concentration of FG was comparable to F 1 h after an intravenous injection of F, both in normal subjects and in patients with retinitis pigmentosa, which suggests that FG may not be an important contributor to the vitreous fluorescence at that time. At later times FG substantially exceeded F. The concentration of FG was significantly higher in diabetics than in the other groups 14 h after an oral dose of F. Accordingly, the possible effect of disease on plasma dye concentrations should be considered in studies measuring F by fluorescence hours after systemic F administration, since this could influence the intraocular fluorescence irrespective of any alteration in ocular function.
    Type of Medium: Electronic Resource
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