Table 3. Changes of N-acetyl-β-D-glucosaminidase by storage time and temperature.

	Storage period (U/L)
	0 hr	6 hr	24 hr	48 hr	144 hr
Refrigerated	17.56 ± 4.07a	17.56 ± 4.42	17.98 ± 4.21	17.71 ± 4.67	18.29 ± 4.19
Room temperature	17.56 ± 4.07	17.92 ± 4.02	18.28 ± 3.94	17.15 ± 4.25	12.01 ± 6.18
Deep freezer	17.56 ± 4.07	17.90 ± 4.26	17.79 ± 3.94	17.81 ± 3.96	17.81 ± 4.08

*, ** Significantly different from control (p<0.05, p < 0.01, respectively).

^aData represent mean ± S.D.