Poly ε caprolactone pellets

The commercial AZ31 magnesium alloy (94 wt.% Mg, 3 wt.% Al and 1 wt.% Zn) used in this study was purchased from Sigma Aldrich as a foil of 10 × 10 cm. From sheets of 1 mm thick, samples of 1 × 10 cm were cut for the coating procedure. Each sample was sanded using SiC abrasive paper with an increasing granulation (400–1200 grain), followed by an immersion for 10 min in absolute ethanol for cleaning. Poly(ε-caprolactone) pellets (Mw = 80,000 g/mol), CM, ZnO nanoparticles with an average diameter of 20–30 nm dichloromethane (DCM), acetic acid (Acetic Ac.) and ethanol were purchased from Sigma Aldrich and used as received. For the electrochemical characterisation, PBS (pH 7.4) with the chemical composition presented in Table 4 was used as electrolyte [206 ].

Poly(ε-caprolactone) pellets (Mw = 80,000 Da) and hydroxyapatite (nanopowder < 200 nm particle size) were purchased from Sigma Aldrich (St. Louis, MO, USA). The Humulus lupulus L. extract containing mainly 83.2% of α-bitter acids (humulone) and 97.3% of β-bitter acids (lupulone), and 90% of xanthohumol was obtained from the Hopsteiner Company (New York, NY, USA). The hop extract was diluted in methanol to prepare the stock solution with a final concentration of 10 mg/mL. The extract was stored at 4 °C in the dark until used. Acetone and methanol were purchased from CTR Scientific S.A de C.V (Monterrey, NL, Mexico), and syringes were purchased from Becton Dickinson (Franklin Lakes, NJ, USA).