Happy New Year and best wishes for your health!
The following photos show two different results from same extraction - STB MHRB extraction. The difference in work steps was only the recrystall step. After water washing and freeze-precipitation I recrystallized half of the product with 100/140°C the other half with 40/65°C NPS
Final product #1 The petroleum ether 100/140 charged / used in the extraction bofre yielded the following very elongated crystals in the glass, however with a great deal of dark orange deposits. The crystals naturally cracked/broke when removed from the glass to be placed in the current container.
2) This half was recrystallized with rapidly evaporating naptha, which was uncharged and therefore unused. The result is completely different: small, compact crystals with almost no yellow-orange deposits, very whitish to transparent.
Both smell distinctly like a wonderful, fresh flower meadow, somehow pure and delightful. They are also practically identical except for the intensity. The 40/65 crystals are weak, and the 100/140 crystals smell extremely strong. Do you have any ideas or knowledge about what this could mean? Or is the intensity of the smell negligible?
My other questions
a) Was it a bad idea to use the charged naphtha, Was that a mistake?
b) What else could be the cause of the increased orange deposits compared to the other result? [No oil got into the glass during pipetting; it must somehow be related to the naphtha?]