Table 7.

Degradation rate constant (K_obs), half-life (t_1/2), t₉₀ and R² values for gatifloxacin in solution.

Temperature (K)	Kobs (h−1) a	t1/2 (h)b	t90 (h)c	R2 for pseudo-first order plots
In 1 N HCl
313 (40 °C)	0.126	5.49	0.83	0.9917
323 (50 °C)	0.161	4.30	0.65	0.9989
333 (60 °C)	0.203	3.42	0.52	0.9930
343 (70 °C)	0.238	2.91	0.44	0.9986
353 (80 °C)	0.330	2.11	0.32	0.9964
In 1 N NaOH
313 (40 °C)	0.081	8.55	1.30	0.9927
323 (50 °C)	0.103	6.71	1.02	0.9921
333 (60 °C)	0.124	5.62	0.85	0.9938
343 (70 °C)	0.140	4.93	0.75	0.9987
353 (80 °C)	0.151	4.58	0.70	0.9971

^aDegradation rate constant.

^bHalf-life.

^cTime for 90% potency left.