*2.4. Hydrolytic Degradation Tests of Bioactive (p-AA-CH2-PL)n Oligoester and [(p-AA-CH2-HP)x-co-(HB)y] (Co)oligoester With the p-AA Moiety*

Hydrolytic degradation tests were performed, according to our previously elaborated protocol [21,23], the specimens were inserted into a thermo-regulated incubator (Memmert GmbH, Schwabach, Germany) set at 37 ◦C in deionized water (pH = 7) in 15 mL screw-capped vials with an air-tight Polytetrafluoroethylene (PTFE)/silicone septum in a period of 14 days. Approximately 20 mg of (p-AA-CH2-HP)n or [(p-AA-CH2-HP)x-co-(HB)y] and 10 mL of aqua were mixed in glass vials. At different time intervals (24, 30, 48, 72 168, and 336 h), the aliquots were removed from the controlled environment and analyzed with the use of ESI-MS measurements accomplished in negative ion mode and by means of HPLC. The tests were carried out in triplicate.
