Production of Edible Films Based on Mango Kernel Flour through Optimization of Thermoplastic Extrusion Process Variables
Keywords:
Mango kernel, Optimization, Films, WVP, CO2P, DesirabilityAbstract
Mango seed is a starch-rich by-product with limited utilization in the juice and canning industries, leading to increased organic waste generation; however, it can be exploited for the production of biopolymers. The objective of this study was to determine the optimal combination of glycerol concentration (%G) and screw speed (SS) to obtain a suitable thermoplastic material for the development of an edible film (EF) with favorable mechanical and barrier properties. Mango kernel flour was used as the raw material. A rotatable central composite design with two factors was applied: %G=15–25 % and SS=120–220 rpm, at five levels, resulting in 13 treatments for thermoplastic material production. The EF were produced by the casting method and evaluated for water absorption index (WAI), water solubility index (WSI), water vapor permeability (WVP), breaking strength (BS), and carbon dioxide permeability (CO₂P). The optimization was carried out using the numerical desirability method employing response surface methodology. Regression and analysis of variance indicated that the optimal processing conditions were %G=19 % and SS=150 rpm. Under these conditions, the predicted values were: WAI: 4.17 g gel/g sample, WSI: 17.99 %, WVP: 3.65 × 10⁻¹¹ g·m/Pa·s·m, BS: 14.13 N, and CO₂P: 4.89 × 10⁻⁶ mL·cm/h·cm²·cmHg. The resulting edible film shows potential for application on fruits, contributing to the maintenance of postharvest quality and the extension of shelf life.
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