Did Dr. Vincent Lebot ever identify the orange substance in the acetone test?

[kasa_balavu]

The colour in nobles come from one of the kavalactones (I have not isolated the exact one).

Does this pic shared by @Gourmet Hawaiian Kava help?

 

[dragonaut]

Very nice, I haven't seen that one before! DMY or Y is the obvious guess, but I don't really have time to confirm it (would require a column chromatography since the lactones are very similar in retention).

 

[dragonaut]

KLs and FKs are present in both noble and two day kava, but two day will have a larger percentage of FKs. Concerning the color, if the 1:3 (w:v) ratio of kava/acetone is maintained and the grind is anything that could reasonably used to make traditional kava, the extraction will be sufficient to make a determination. Acetone extraction is very efficient, how coarse a grind are you describing?



I'd be happy to test your method, please post or PM details.

The grind I got was extremely coarse, so that is probably the explanation. I sent you a PM, since I don't want to put the method up here if it's unreliable

 

[AndrewG]

Did you know Dr. Lebot is scientific coordinator of SPYN: The South Pacific Yam Network?

yes

 

[AndrewG]

He is working on a new color now