Well I proceeded to experiment with this waste and was unable to recover anything of use, even after notable concentration. So I feel better about dumping it, now.
To my surprise I also isolated an untestable volume of volatile oil from my 4X mansked harmalas. It seems volatile plant oils may 'stick' to harmala•HCl.
Details:
13 grams of mixed harmala•HCl was dissolved in distilled water and based with 10% ammonia, after filtration the 425ml of liquid waste had a pH of 9,65 and glowed vividly under UV.
This solution was concentrated by distilling off 315ml of water, the ammonia went with it and a drop of an unknown steam volatile oil also distilled over. The remaining 110ml of liquid now had a pH of 3,61 presumably due to ammonium chloride. pH was brought to 9,30 with sodium carbonate.
60ml of 91% isopropanol was added and the mixture saturated with salt with stirring. Nearly all color migrated to the alcohol layer in room light and under UV. The alcohol extract [espresso colored] was isolated, a second alcohol pull was done getting most of the residual UV fluorescent material [the resulting alcohol pull was amber in color], and the pulls were combined.
150mg of citric acid was added. 50ml of distilled water was added. The alcohol was fractionally distilled off, leaving 50 ml of a red solution with a pH between 5 and 6 and containing some red-black solids. The small amount of solids were filtered out and 30ml of saturated salt water was added. The solution was chilled and left in an ice bath for many hours. Another small quantity of the red-black gunk precipitated from the now amber liquid but no alkaloid hydrochloride crystals formed. The solution still fluoresced under UV, but not as strongly as before.
The combined red-black solids were not measured but amounted to very little actual weight.
Experiment concluded.
I'm really starting to think that the red-black solids often encountered in work with rue alkaloids are an oxidation product of the alkaloids rather than residual plant gunk.
I'm looking forward to trying Jagubes method now, as a bonus I'll finally get to play with the accessory alkaloids without much extra effort at all.
I wonder if I'll find a practical use for vasicine.