Tesis
Películas biodegradables activas a base de almidón termoplástico y poli (ε-Caprolactona): Aplicación tecnológica de extractos antioxidantes provenientes de cascarilla de arroz
Autor
Piñeros Guerrero, Nicolás David
Sierra Barahona, Franklyn David
Institución
Resumen
Films of a polymeric material based on cassava starch and poly ε--caprolactone (PCL) were
made, with antioxidant properties. The influence of PCL and the antioxidant extract were
evaluated, over the mechanical, optical, morphological, thermal, barrier and chemical
properties of the films. These were elaborated with, and without the antioxidant extract,
which is rich in polyphenolic compounds. The films were conditioned at 20°C and 53% RH.
The antioxidant extract was obtained from rice husk, by the hot water methodology in a high
pressure reactor, at 160°C and 10 bar. The total phenolic content of the extract was 12,27
(mEAG/100g dry matter) and the antioxidant activity had a value of 6691,95(mETRX/100g
dry matter). The extract was incorporated into a thermoplastic starch and poly Ecaprolactone
matrix, and films by compression molding were obtained.
The films were also characterized on their biodegradability, and it was found that at the end
of 24 days, percentages higher than 60% of biodegradation were reached. The antioxidant
capacity was evaluated by DPPH method, where the lesser value was 1,54 (kg film/g DPHH)
from EC50, it was found that the addition of PCL and antioxidant improved the general
properties of the films.