Table 2.

The minimum absorbance and rate of depolymerization were calculated following the temperature reduction to 4 °C. Both depolymerization assay kinetics changed significantly. Data were obtained from three repetitions.

	Control group	5 mg/kg morphine	10 mg/ kg morphine
Minimum absorbance	0.3960 ± 0.002636	0.5996 ± 0.0023***	0.8918 ± 0.0079***
Rate of depolymerization	0.01984 ± 0.0015	0.0141 ± 0.0011*	0.0081 ± 0.0003*

(One way ANOVA, *P < 0.05, *** P < 0.001, Values are shown as means ± SEM (n = 10/group).