Preparación de films a base de quitosano enriquecido con flavonoides totales de Ñachak (Bidens andicola).

Abstract

The objective of the research was to prepare active films based on chitosan incorporated a concentrated hydroalcoholic extract of Bidens andicola (BAHE) in different concentrations. The plant material was extracted with 70% ethanol v / v in a relation (1.4), it was concentrated under controlled conditions and the residue obtained constituted the BAHE, then, the determination of total phenols and the total content of flavonoids in BAHE was carried out to standardize it. While the characterization of the active films, attenuated total reflectance infrared spectrometry (FT / IR) was used, which in turn allowed to visualize the potential interactions between the chitosan and the phenolic and flavonoid compounds of BAHE in the films. Also, physical properties such as thickness, density, moisture content, opacity, water solubility, and water vapor permeability were measured. The antioxidant activity of the films was related to the content of total phenols and flavonoids of the films by the free radical scavenging activity of 2,2-diphenyl-1picrylhydrazyl. The results indicated that the incorporation of BAHE caused interactions between the chitosan and the polyphenols / flavonoids of BAHE resulting in darker-looking films. After the addition of BAHE, the films showed a decrease in both water solubility and water vapor permeability. While the incorporation of polyphenols and flavonoids from BAHE improved the total content of phenolic compounds and flavonoids in addition to their ability to capture free radicals of 2,2-diphenyle-1-picrylhydrazyl from the films in terms of antioxidant activity. However, the antioxidant activity of the incorporated polyphenols / flavonoids of the BAHE incorporated chitosan films decreased with ti me.