I get wood lovers paralysis. Below 2 grams there is usually none. Over 2.5 grams I loose ability to focus my eyes well after the peak. 4 grams or more the inability to focus is very pronounced. Can not focus my eyes at all. Quite strange. Also weakness in the quad muscles. It seems to become more pronounced every time; which seems to implicate upregulation of the receptors responsible.
In terms of extracting away from the compound; I would place bets that, if the compound is aeruginascin the Casale A/B extraction would not extract it because a weak acid should not remove the positive charge of a trimethyl amine. I could be completely mistaken. People here seem not to like the Casale procedure but reports indicate ascorbate works well to stabilize the extract.
Otherwise extracting to methanol, drying, and then recrystallizing seem like the best option; although would have no idea whether or not this would exclude aeruginascin. I would think aeruginascin would be soluble in methanol; because small charged compounds seem to be universally soluble in water and ethanol/methanol.