Table 4.

Mitragynine stability in SGF and SIF (with enzymes).

Time (min)	SGF	RD (%)	SIF
	Concentration Found (µg/mL)		Concentration Found (µg/mL)	RD (%)
0	18.72 ± 0.05	-	6.70 ± 0.60	-
10	18.68 ± 0.23	−0.21	6.69 ± 0.63	−0.07
20	14.98 ± 0.88	−20.00	6.56 ± 0.67	2.06
30	14.54 ± 0.58	−22.5	6.99 ± 0.21	4.43
40	14.19 ± 0.37	−22.31	7.03 ± 0.13	4.94
50	14.11 ± 0.22	−24.19	6.93 ± 0.13	3.49
60	13.94 ± 0.20	−25.53	6.86 ± 0.01	2.49
120	-	-	6.78 ± 0.79	1.31
180	-	-	6.93 ± 0.77	3.46