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11 pages, 1643 KiB

Open AccessArticle

Influence of Ulluco Starch Modified by Annealing on the Physicochemical Properties of Biodegradable Films

by Luis Daniel Daza, Daniela O. Parra, Carmen Rosselló, Walter Murillo Arango, Valeria Soledad Eim and Henry Alexander Váquiro

Polymers 2022, 14(20), 4251; https://doi.org/10.3390/polym14204251 - 11 Oct 2022

Cited by 6 | Viewed by 2308

Abstract

This work aimed to evaluate the use of annealing (ANN) ulluco starch in the preparation of biodegradable films and its impact on the physicochemical properties of the materials. Three film samples (FS1, FS2, and FS3) were prepared at a fixed starch concentration (2.6% w/v) using glycerol as a plasticizer and then compared to a control sample (FSC) prepared with native ulluco starch. The physical, mechanical, and thermal properties of the films were evaluated. The use of ANN starch decreased the solubility (from 21.8% to 19.5%) and the swelling power (from 299% to 153%) of the film samples. In addition, an increase in opacity and relative crystallinity (from 7.54% to 10.5%) were observed. Regarding the thermal properties, all the samples presented high stability to degradation, with degradation temperatures above 200 °C. However, the samples showed deficiencies in their morphology, which affected the barrier properties. The use of ANN starch has some advantages over native starch in preparing films. However, more analysis is needed to improve the barrier properties of the materials. This work reveals the potential of the ANN ulluco starch for biodegradable film preparation. In addition, the use of modified ulluco starch is an alternative to add value to the crop, as well as to replace non-biodegradable materials used in the preparation of packaging. Full article

(This article belongs to the Special Issue Progress in Polymer Membranes and Films)

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14 pages, 14517 KiB

Open AccessArticle

Influence of Ulluco Starch Concentration on the Physicochemical Properties of Starch–Chitosan Biocomposite Films

by Luis Daniel Daza, Valeria Soledad Eim and Henry Alexander Váquiro

Polymers 2021, 13(23), 4232; https://doi.org/10.3390/polym13234232 - 2 Dec 2021

Cited by 10 | Viewed by 3294

Abstract

This work aimed to prepare ulluco starch (US)/chitosan (Ch) edible films and evaluate the effect of the concentration of US on their physicochemical properties. The use of edible films is a means of adding value to the ulluco crop and evaluating the viability of using new sources to produce packaging materials. Different samples were prepared at different US concentrations (2%, 3%, 4%, and 5% w/v) and a fixed chitosan concentration (1.5% w/v); then, samples were analyzed, considering their physical, mechanical, and thermal properties. The US/Ch edible films showed an increase in solubility from 17.5% to 21.7%, swelling power (SP) from 38.9% to 267%, tensile strength (TS) from 3.69 MPa to 10.7 MPa, Young modulus (YM) from 18.0 Pa to 652 Pa, and thermal stability as the US concentration increased. However, samples with low US concentrations showed higher elongation at break (EB) (36.6%) and better barrier properties (WVP) (5.61 × 10⁻¹¹ g/m s Pa). The films evaluated in this work presented good physical, mechanical, and barrier properties, revealing their potential as packaging material ensuring food security, and demonstrating the technological potential of US. Full article

(This article belongs to the Section Biobased and Biodegradable Polymers)

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