Table 3.

Fitting results of fluorescence decay spectra (λ_exc = 295 nm, λ_em = 330 ± 6 nm).

	Fractional contributions (%)		Individual fitted lifetimes (ns)		Average lifetime (ns)
	f1	f2	τ1	τ2	〈τ〉
pH 2
Initial	30.0 ± 0.01	70.0 ± 0.02	1.49 ± 0.049	4.62 ± 0.017	3.68 ± 0.012
Day 1	29.4 ± 0.02	70.6 ± 0.03	1.61 ± 0.063	4.74 ± 0.037	3.82 ± 0.013
Day 2	29.9 ± 0.01	70.1 ± 0.02	1.63 ± 0.070	4.75 ± 0.029	3.82 ± 0.013
Day 3	29.4 ± 0.01	70.6 ± 0.01	1.62 ± 0.024	4.80 ± 0.010	3.86 ± 0.012
Day 4	29.8 ± 0.03	70.2 ± 0.03	1.60 ± 0.030	4.74 ± 0.024	3.80 ± 0.008
Day 5	29.5 ± 0.05	70.5 ± 0.05	1.58 ± 0.012	4.72 ± 0.020	3.79 ± 0.011
Day 6	30.0 ± 0.02	70.0 ± 0.02	1.58 ± 0.011	4.73 ± 0.026	3.79 ± 0.011
pH 9
Initial	0.18 ± 0.01	0.82 ± 0.01	2.01 ±0.18	6.14 ± 0.10	5.42 ± 0.14
Week 1	0.18 ± 0.01	0.82 ± 0.01	1.76 ± 0.17	5.99 ± 0.13	5.26 ± 0.15
Week 2	0.19 ± 0.01	0.81 ± 0.01	1.77 ± 0.01	5.87 ± 0.15	5.10 ± 0.09
Week 3	0.20 ± 0.02	0.81 ± 0.02	1.83 ± 0.11	5.96 ±0.14	5.16 ± 0.17
Week 4	0.19 ± 0.01	0.81 ± 0.01	1.70 ± 0.10	5.87 ± 0.15	5.10 ± 0.18
Week 5	0.21 ± 0.02	0.80 ± 0.02	1.72 ± 0.13	5.85 ± 0.16	5.02 ± 0.20
Week 7	0.22 ± 0.02	0.78 ± 0.02	1.74 ± 0.13	5.88 ± 0.15	5.00 ± 0.20
Week 8	0.23 ± 0.03	0.77 ± 0.03	1.72 ± 0.13	5.83 ± 0.16	4.91 ± 0.20