Fuente: WIPO "circular economy" A microbial cellulose material is provided comprising an acid, a metal ion, and microbial cellulose. The acid can be a polyphenol. The metal ion can be selected from a group consisting of iron ion (Fe2+), iron ion (Fe3+), copper ion (Cu2+), aluminum ion (Al3+), magnesium ion (Mg2+), zinc ion (Zn2+), nickel ion (Ni2+), germanium ion (Ge4+), titanium (Ti4+), molybdenum (Mo6+) and tungsten ion (W6+). The microbial cellulose can be a bioplasticized microbial cellulose.