Abstract
The effect of hydroxylamine (NH 2 OH), p-aminobenzoic acid (PABA) and p-aminosalicylic acid (PASA) on the spectrum of the final product(s) formed when o-dihydroxy- and trihydroxyphenols were oxidized by tyrosinase was examined. New pigmented product(s), probably oximes, were formed by the interaction of NH 2 OH with the o-quinones of 4-methyl catechol, 3,4-dihydroxyphenylacetic acid (DOPAC) and 3, 4-dihydroxyphenylpropionic acid (3, 4-DPPA) but not with the o-quinones of catechol or protocatechuic acid. Interaction of PABA or PASA with the o-quinones of catechol, 4-methyl catechol, protocatechuic acid, DOPAC and 3,4-DPPA also yielded pigmented oximes. The interaction ofthe o-quinones of trihydroxyphenols with NH 2 OH, PABA or PASA had little effect on the spectrum of the final product(s), suggesting that oximes are not formed in these reactions.
Published Version
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