Arapey sweet potato peel waste as renewable source of antioxidant: extraction, nanoencapsulation and nanoadditive potential in films

BEATRIZ GUERRERO; GRACIELA CORBINO; ALAIN DUFRESNE; MARIA INES ERREA; NORMA B. D'ACCORSO; NANCY LIS GARCIA

JOURNAL OF POLYMER RESEARCH

SPRINGER

Lugar: Berlin; Año: 2020

1022-9760

In this work, the peel of Arapey Sweet Potato (Ipomoea batatas), a vegetable waste,was used as a source of phenolic compounds which are widely recognized asbeneficial antioxidants for human health. The extract obtained from Ipomoea batatasexhibited an antioxidant activity significantly higher than many antioxidant agentsreported in literature (476.96 mg of TROLOX mL-1), as well as good thermal stability.Nanocapsules of the extract coated with low molecular weight polylactic acid wereprepared by the emulsification-solvent evaporation method and the nanoparticlesobtained were characterized physical; thermal; and morphologically. An analysis of thevariables that were investigated to increase the encapsulation efficiency is presentedhere. Besides, PLA films prepared via the solution-casting method exhibited goodcompatibility with the nanoparticles loaded with the antioxidant extract, as wasevidenced by the uniform and stable dispersion of these particles in the films.Furthermore, an improvement of the mechanical properties of the PLA films due to thepresence of the nanoparticles were clearly observed. Results reported here are