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Amund Ringvold, Erlend Anderssen, Inge Kjønniksen; UV Absorption by Uric Acid in Diurnal Bird Aqueous Humor. Invest. Ophthalmol. Vis. Sci. 2000;41(8):2067-2069.
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purpose. To analyze the components responsible for the UV absorbance in diurnal
bird aqueous humor.
methods. The absorbance studies were carried out using a Hitachi
spectrophotometer (U 2000). Uric acid was determined by
high-performance liquid chromatography (LC-10 system; Shimadzu, Kyoto,
Japan). Chicken and turkey eyes were examined.
results. The UV absorbance in chicken aqueous was largely accounted for by the
presence of protein, tryptophan, tyrosine, ascorbic acid, and uric
acid. Ascorbic acid was low (23 μmol/l). Uric acid was, on the other
hand, remarkably high (151 μmol/l) compared with that in mammals
(cattle, 16 μmol/l). Principally the same results were obtained in
chicken and turkey.
conclusions. Uric acid is a significant UV-absorbing substance in the aqueous humor
of diurnal birds with its peak absorbance at 292 nm. The hypothesis
that the aqueous humor acts as a UV filter seems to be valid also for
the avian eye. However, in these eyes uric acid fulfills the role that
ascorbic acid does in mammals.
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