Comparison of the P(HO-co-HX) degradation products identified by HPLC-MS after 1 h of enzymatic hydrolysis of PhaZBd versus PhaZGK13. HO, hydroxyoctanoate monomer; HX-HO, dimer of hydroxyhexanoate and hydroxyoctanoate; HO-HO, dimer of hydroxyoctanoate; HO-HX-HO, trimer of hydroxyhexanoate and hydroxyoctanoate; HO-HO-HO, trimer of hydroxyoctanoate.