I've measured dopaquinone consumption with the addition of cysteine (presumable forming cysteinyldopa), and cystenyldopaquinone formation both with MBTH (to halt the reaction at cysteinyldopaquinone - although I'm not sure if it worked properly) and without to allow cysteinyldopaquinone to convert to pheomelanin through its benzothiazine intermediates but am not sure if there's an easier way...?
No way, Anything you can get concerning that will be totally new. On the other hand, cysteine and MBTH compete for dopaquinone. In my hands, cysteine reacts faster than MBTH, although the reaction rates could change with pH. Provided that you get to trap o-dopaquinone with MBTH, I do not think that you get pheomelanin and Cysteine addition, but the system is quite complex.
God luck.
Brilliant, thanks for that Francisco! It's good to know I'm working along the right lines!
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