Aromatic hydroxylation of phenylalanine as an assay for hydroxyl radicals. Measurement of hydroxyl radical formation from ozone and in blood from premature babies using improved HPLC methodology.
Highly reactive hydroxyl radicals (OH.) attack the amino acid phenylalanine to give ortho-, meta-, and para-tyrosines. An improved HPLC-based separation of these products is described. Both D- and L-phenylalanine are attacked by OH., although only the latter is a substrate for the enzyme phenylalanine hydroxylase. Use of this improved aromatic hydroxylation assay to detect OH. is illustrated by measuring OH. in ozonized aqueous solutions at pH 7.4, and by showing that blood from some premature babies appears to be capable of catalyzing OH. formation.
Kaur
H
H
Pharmacology Group, King's College, University of London, United Kingdom.
Halliwell
B
B
D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D005312:Fetal Blood / Q000502:physiology; D006801:Humans; D017665:Hydroxyl Radical / Q000032:analysis*; D006900:Hydroxylation; D007231:Infant, Newborn; D007234:Infant, Premature / Q000097:blood*; D015394:Molecular Structure; D010126:Ozone; D010649:Phenylalanine / Q000032:analysis*; D012996:Solutions; D013237:Stereoisomerism; D014867:Water / Q000737:chemistry
D012996:Solutions; D014867:Water; D017665:Hydroxyl Radical; D010649:Phenylalanine; D010126:Ozone