So my Peganum harmalas are fruiting out and I couldnt remember if, for ß-carboline alkaloid yield, they were best harvested ripe or unripe. I searched here and in my books and only got confused by contradictory quotes.
Some here give vague references to unripe seed being 'weaker', others say 'stronger'.
Ott references works stating...
Quote:The mature seeds of Peganum harmala show the highest concentration of the ß-
carboline alkaloids in this plant, the reported range being from 2-7%, while the
roots contain from 1.4-3.2% (Kutlu & Amal 1967; al-Shamma & Abdul-Ghany
1977).
That implies that immature seeds were tested but without quantitative data it could easily be a mistaken implication. I managed to translate the abstract of the turkish paper and it seemed to just have tested mature seeds.
"In this study, collected from the vicinity of Nigde-Bor P. harmala L. (Zygophyllaceae) mature seeds of plant active principles were examined." That is the one that reported the 7% and it was "total alkaloid" rather than total ß-carbolines.
K. Trout says that Degtyarev et al. 1984 Chemistry of Natural Compounds 20 (2): 240-241 states...
Quote:harmine and harmaline together to form only 25% of the total alkaloids present in the ripe fruit but 75% of the total alkaloid present in the green fruit (Collected in Yagnob Basin, Tadzhikistan during July)
Total alkaloid content was higher in ripe than unripe fruit but profiles were different so the actual total harmine yield was far higher in the unripe fruit.
Ripe seeds were found to contain 0.9% harmine and 0.6% harmaline.
Green seeds were found to contain 4.3% harmine and 0.28% harmaline.
Peganine was present as 40% of the total alkaloid in the ripe fruit (2.5% peganine) but only 5% of the total alkaloid in the green fruit (0.28% peganine).
Deoxyvascicinone was present as 15% of the total alkaloid in the ripe fruit (0.9%) and 5% in the green fruit (0.28%).
I'm tempted to go with Degtyarev.
I thought I had once read a thread here that tested the issue but I've searched to no avail.
Has anyone compared 'green' and ripe seed pods, either quantitatively or subjectively?
My yield this year will be too low to obtain a amount sufficient for extraction from both ripe and unripe fruits.