Table 2. Radiochemical yields (±standard deviation) for the reactions of ⁶⁸Ga³⁺ with DOTA, NOTA, NOTP, TRAP, HBED, DFO and THP. Experiments were undertaken in triplicate.

Chelator	Concentration (μM)	pH 3.5, 25 °C	pH 3.5, 90 °C	pH 6.5, 25 °C	pH 6.5, 90 °C
DOTA	500	98.3 ± 0.4		97.0 ± 0.7
	50	86.7 ± 5.0	95.3 ± 0.9	73.2 ± 6.4	97.2 ± 0.3
	5	20.7 ± 5.6	90.1 ± 1.5	9.6 ± 5.9	21.6 ± 2.5
	0.5	6.2 ± 2.8	16.5 ± 2.2	2.3 ± 0.7	2.8 ± 0.2
	0.05	3.5 ± 1.1	3.1 ± 0.7	1.7 ± 0.5	2.8 ± 0.5
NOTA	500	98.2 ± 0.6		96.6 ± 1.2
	50	96.2 ± 1.7	93.7 ± 0.3	97.5 ± 0.1	98.5 ± 0.1
	5	93.2 ± 2.0	57.3 ± 2.6	90.6 ± 4.5	94.4 ± 0.4
	0.5	25.4 ± 35.6	17.4 ± 2.1	3.8 ± 0.3	4.9 ± 0.4
	0.05	4.0 ± 2.2	2.2 ± 0.5	1.9 ± 0.7	2.8 ± 0.2
NOTP	500	97.0 ± 0.8		96.7 ± 1.8
	50	95.0 ± 1.8	54.3 ± 2.4	97.5 ± 0.1	97.3 ± 0.4
	5	68.7 ± 25.0	74.9 ± 3.4	96.6 ± 0.4	94.2 ± 0.9
	0.5	26.8 ± 33.0	20.0 ± 1.9	84.3 ± 0.9	93.5 ± 0.8
	0.05	5.2 ± 3.7	3.9 ± 0.7	4.8 ± 0.4	6.8 ± 1.2
TRAP	500	95.6 ± 0.7		96.5 ± 0.4
	50	95.0 ± 1.3	93.0 ± 0.6	96.6 ± 0.1	96.0 ± 1.4
	5	92.5 ± 2.4	92.0 ± 1.5	89.0 ± 1.4	95.2 ± 0.4
	0.5	23.0 ± 9.5	53.1 ± 4.8	5.1 ± 0.8	8.8 ± 2.0
	0.05	7.4 ± 1.5	5.5 ± 0.6	2.0 ± 0.5	2.8 ± 0.5
HBED	500	93.2 ± 3.8		92.2 ± 0.6
	50	90.4 ± 8.1	87.7 ± 0.5	93.3 ± 3.0	97.2 ± 0.4
	5	68.6 ± 23.5	75.2 ± 0.8	92.7 ± 2.2	95.4 ± 0.8
	0.5	11.6 ± 11.9	5.8 ± 0.4	86.0 ± 3.9	87.5 ± 4.4
	0.05	4.9 ± 2.2	2.5 ± 0.4	4.6 ± 0.7	5.1 ± 0.8
DFO	500	96.0 ± 0.8		96.4 ± 1.4
	50	24.5 ± 1.9		97.5 ± 0.7
	5	23.0 ± 12.9		97.0 ± 1.0
	0.5	10.5 ± 5.4		95.8 ± 1.5
	0.05	11.2 ± 5.0		3.6 ± 1.3
THP	500	96.7 ± 1.4	96.2 ± 0.8	95.8 ± 1.6	94.3 ± 0.7
	50	92.7 ± 4.2	95.9 ± 0.5	97.1 ± 1.1	94.2 ± 0.6
	5	77.8 ± 13.5	92.7 ± 1.1	97.1 ± 0.1	94.0 ± 0.3
	0.5	25.4 ± 6.8	83.4 ± 1.1	97.1 ± 0.6	10.7 ± 2.6
	0.05	14.0 ± 6.8	24.3 ± 3.4	3.8 ± 3.6	6.1 ± 1.1