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Uroporphyrin
uroporphyrin[¦yu̇r·ə′pȯr·fə·rən] (biochemistry) Any of several isomeric, metal-free porphyrins, occurring in small quantities in normal urine and feces; molecule has four acetic acid (‒CH2COOH) and four propionic acid (‒CH2CH2COOH) groups. Uroporphyrin any of the pigments of the porphyrin group that are similar in structure and that occur primarily in urine and feces. In a number of pathological states (porphyria, certain types of poisoning), the content of one uroporphyrin in human urine sharply increases (to several hundred mg). Uroporphyrins have been found in the shells of pearl oysters and in planarians. uroporphyrin
uroporphyrin [u″ro-por´fĭ-rin] any of several porphyrins produced by oxidation of uroporphyrinogen; one or more are excreted in excess in the urine in several of the porphyrias.ur·o·por·phy·rin (yūr'ō-pōr'fi-rin), 1. Porphyrin excreted in the urine in porphyrinuria; for example, urobilin.
See also: porphyrinogens. 2. Class name for all porphyrins containing 4 acetic acid groups and 4 propionic acid groups in positions 1 through 8.
See also: porphyrinogens. ur·o·por·phy·rin (yūr'ō-pōr'fi-rin) 1. Porphyrin excreted in the urine in porphyrinuria. 2. Class name for all porphyrins containing four acetic acid groups and four propionic acid groups in positions 1 through 8.
See also: porphyrinogens |