Effect of Gamma Irradiation on Structural and Biological Properties of a PLGA-PEG-Hydroxyapatite Composite

Table 6

Detailed results of alkaline phosphatase activity test (percent of enzyme activity in comparison with control group) for hydroxyapatite, copolymer, and composite under 0, 25, and 50 KGy doses of gamma irradiation in days 3, 7, and 14.

Material	Nonirradiated; Percent of enzyme activity in comparison with control group		25 KGy irradiation; Percent of enzyme activity in comparison with control group		50 KGy irradiation; Percent of enzyme activity in comparison with control group
	Day 7	Day 14	Day 7	Day 14	Day 7	Day 14
Hydroxyapatite	99.22 ± 4.52	130.2 ± 19.88	87 ± 12.25	105.58 ± 8.54	77.77 ± 3.6	113.72 ± 1.7
Copolymer	60.22 ± 3.65	51.76 ± 2.61	76.88 ± 2.72	64.64 ± 5.67	69.44 ± 3	51.96 ± 6.62
Composite	82.88 ± 1.83	72.84 ± 2.52	81.11 ± 15.29	65.5 ± 1.8	81.88 ± 4.22	67.35 ± 13.7