Enhanced Absorption Study of Ginsenoside Compound K (20-O-β-(D-Glucopyranosyl)-20(S)-protopanaxadiol) after Oral Administration of Fermented Red Ginseng Extract (HYFRG™) in Healthy Korean Volunteers and Rats

Table 4

Results of stability of compound K in human plasma and methanol.

Nominal concentration (ng/mL)	Compound K ()
	3	300	800
Working stock solution (%)
Room temperature, 6 h
Compound K in plasma (%)
Room temperature, 17 h
4°C, 17 h
−80°C, 17 h
Freeze-thaw stability (%)
Three cycles, −80°C
Stability of extracted (%)
Autosampler (4°C), 20 h