Evaluation of Ibuprofen Prolonged Release of Biomedical PLA-PEG-PLA Hydrogel via Degradation Mechanism

Table 1

Change in pH value of the copolymer solution in time.

	Initial time	1 week	2 weeks	3 weeks	4 weeks
pH	7.40	3.66 ± 0.06	3.34 ± 0.04	3.24 ± 0.04	3.20 ± 0.03