MaterialsChitosan (degree of deacetylation = 98%) was purchased fromFluka (Switzerland) and Bombyx mori silk fiber was obtained froma local agricultural farm in Miaoli County, Taiwan. NaHCO3, CaCl2 CaCl2and ethanol were bought from Sigma-Aldrich (USA), Showa (Japan)and Echo (Taiwan), respectively. Trifluoroacetic acid (TFA) anddichloromethane (DCM) were procured, respectively, from AlfaAesar (UK) and J.T. Baker (USA). Dialysis membrane tubes (CelluSepH1) were purchased from Orange Scientific (USA). All chemicalsexcept B. mori silk fiber was used as received.