Alginate/carboxymethyl cellulose/starch-based active coating with grapefruit seed extract to extend the shelf life of green chilli

Abstract

The present study investigates a functional packaging film made of alginate (SA), carboxymethyl cellulose (CMC), and starch from potato (PS) with grapefruit seed extract (GSE) by solvent casting method. The surface morphology of the prepared films was analysed by SEM, and results revealed that the GSE was homogeneously mixed with the polymer matrix and maintained uniformity in thickness, creating a continuous structure without any cracks or pores. Incorporating GSE enhanced the UV barrier properties (>99.9%) without compromising much of the transparency of the film. All the prepared films with grapefruit seed extract offered high antioxidant and antimicrobial (Escherichia coli and Staphylococcus aureus) properties. Also, the inclusion of GSE reduced the TS and water vapour permeability properties. In comparison, the inclusion of GSE enhanced the flexibility and thermal stability of the film. The prepared blend solution with 0.5 g of GSE effectively enhanced the shelf life of green chilli by 25 days.