So far, the only yeast laccase purified was from the human pathogen Cryptococcus (Filobasidiella) neoformans; a true laccase capable of oxidation of phenols and aminophenols
but not tyrosine  (Williamson, 1994).
They can catalyze the oxidation of ortho and para diphenols, aminophenols
, polyphenols, polyamines, lignin, dyes, and aryl diamines.
Oxyphenolate complexes of niobium are insoluble in chloroform, while mixed-ligand complexes with hydrophobic amines and aminophenols
easily dissolve in various organic solvents [10, 11].
Damages caused by aminophenols
are related to fast oxidation of these compounds in physiological conditions to benzosemiquinoimines that are finally transformed to p-benzoquinoimines.
are interesting electrochemical materials (6-11) since, unlike aniline (12) and other substituted anilines (13), they present two oxidizable groups (N[H.
Gas chromatography has been used to identify oxidation dyes, including aminophenols
, on human hair .
most phenols including phenol, chlorophenols, nitrophenols and aminophenols
are characterized by toxic activity.
The method is based on the Schiff's base formation of aminophenols
with 1,2-naphoquinone sulphonate (NQS) as a chromogenic reagent in the presence of micellar cityltrimethyl ammonium bromide (CTAB) and sodium carbonate.
By the electroreduction  of nitrophenol isomer using stationary and rotating Cu electrodes and Ti(S04)2 as additional agent, aminophenols
were obtained in good yield.
One, referred to as the "primary," is exemplified by the phenylenediamines, and the other, often an aminophenol
, is known as the "coupler.