Formular un bioplástico basado en quitosano con actividad antioxidante.

Abstract

The present research was carried out with objective for elaborating a bioplastic-based chitosan with antioxidant activity, enriched with the hydroalcoholic extract from Justicia chlorostachya Leonard at different concentrations. The bioplastics were made from a solution of 2% w/v chitosan (weight / volume) to which 30% as plasticizer, then different concentrations of extract were added (10%, 20%, 30% and 40%) glycerol was added. The bioplastic solutions were distributed in Petri boxes and dried them at 50°C and relative humidity RH (Relative Humid) 25%. The bioplastic solutions were kept in an airtight container 73% HR for 48 hours before their analysis. The contents of phenolic compounds and total flavonoids hydroalcoholic extract and of elaborated bioplastics were evaluated. The free radical scavenging activity was assayed by the method (DPPH). Through IR Spectroscopy, the interactions between chitosan and extract components were investigated. The physicochemical properties of bioplastics such as density, moisture content, opacity, water solubility and water vapor permeability were determined. Interactions between chitosan and phenolic compounds verified by changes in peaks of IR spectrum were detected. The bioplastic with the best properties was formulated with 40% concentration of extract, with the following properties contained was humidity 27,16 ± 0,695%, solubility in water WS= 16,62 ± 0,59% and permeability to water value WVP= 3,02 g mm/m2 kPa day, respectively. In addition, it presented a considerable amount of total pheols 274,15 ± 4,62 mg GAE / g of bioplastic and flavonoids 46,16 ± 1,76 mg QE /g of bioplastic. The antioxidant activity of bioplastics declined over time. The results suggest that the incorporation of extract in the bioplastics forming solution has a positive influence to consider them as a viable alternative to use them as packing materials. A microbiological study is recommended.