Table 3.

Stability of papain powder tablet alone and in combination with different excipients under accelerated storage conditions (40 ± 2°C/75 ± 5% RH).

Formulation	% activity remaining				K (days−1)
	0 M	1.5 M	3 M	6 M
PP	100.00 ± 3.12	94.07 ± 2.75	83.56 ± 3.18	75.84 ± 2.87	1.54 × 10−3
PM	100.00 ± 2.61	97.54 ± 2.13	94.53 ± 1.66	88.69 ± 2.19	6.67 × 10−4
PD	100.00 ± 3.48	96.21 ± 2.67	93.50 ± 3.61	87.14 ± 4.62	7.65 × 10−4
PC	100.00 ± 2.24	96.18 ± 4.51	92.45 ± 3.81	83.62 ± 3.26	9.94 × 10−4
PA	100.00 ± 3.28	94.41 ± 1.94	90.32 ± 4.45	82.96 ± 5.14	1.04 × 10−3
PT	100.00 ± 3.09	95.04 ± 1.93	91.74 ± 4.19	83.06 ± 4.11	1.03 × 10−3

^*Values are mean ± SE (n = 3); M: months; K _cal: calculated first-order degradation rate constant.