Table 2:

Instability of [¹⁸F]FTHA at different radioactivity concentration and growth of unknown side product over time.

SN	Fatty acid	Radioactivity Concentration (GBq/mL or mCi/mL)		Time of Post synthesis analysis	Peak I (Unknown)		Peak II (Product)
					Retention Time (min)	Relative Percentage	Retention Time	Relative Percentage
1	[18F]FTHA	High conc. (2.37 GBq/mL or 64.0 mCi/mL at time zero)	2.2 GBq/mL (60.1 mCi/mL)	10 min	4.08	10.2%	6.38	89.8%
			1.6 GBq/mL (43.8 mCi/mL)	60 min	-	-	-	-
			1.1 GBq/mL (30.0 mCi/mL)	120 min	4.08	28.3%	6.33	71.7%
			0.76 GBq/mL (20.5 mCi/mL)	180 min	4.07	34.3%	6.34	65.7%
			0.52 GBq/mL (14.0 mCi/mL)	240 min	4.11	37.2%	6.76	62.8%
		Low conc. (0.89 GBq/mL or 24.0 mCi/mL at time zero)	0.74 GBq/mL (19.9 mCi/mL)	30 min	4.22	11.5%	6.41	88.5%
			0.60 GBq/mL (16.4 mCi/mL)	60 min	4.04	10.0%	6.35	90.0%
			0.41 GBq/mL (11.2 mCi/mL)	120 min	4.02	14.2%	6.20	85.8%
			0.29 GBq/mL (7.7 mCi/mL)	180 min	4.08	13.8%	6.34	86.2%
			0.20 GBq/mL (5.27 mCi/mL)	240 min	4.16	13.3%	6.79	86.7%
2	[18F]FTHA	High conc. (1.25 GBq/mL or 33.9 mCi/mL at time zero)	1.2 GBq/mL (31.8 mCi/mL)	10 min	4.05	6.0%	6.15	94.0%
			0.86 GBq/mL (23.2 mCi/mL)	60 min	4.05	9.1%	6.12	90.9%
			0.59 GBq/mL (15.9 mCi/mL)	120 min	4.08	9.4%	6.12	90.6%
			0.40 GBq/mL (10.9 mCi/mL)	180 min	4.13	11.9%	6.20	88.1%
			0.28 GBq/mL (7.5 mCi/mL)	240 min	4.03	12.8%	6.14	87.2%
		Low conc. (0.52 GBq/mL or 14.0 mCi/mL at time zero)	0.43 GBq/mL (11.6 mCi/mL)	30 min	3.57	5.4%	5.62	94.6%
			0.36 GBq/mL or 9.6 mCi/mL	60 min	4.05	8.8%	6.14	91.2%
			0.24 GBq/mL (6.5 mCi/mL)	120 min	4.03	8.3%	6.18	91.7%
			0.17 GBq/mL (4.5 mCi/mL)	180 min	-	-	-	-
			0.11 GBq/mL (3.0 mCi/mL)	240 min	4.09	9.8%	6.12	90.2%