Evaluation of Biopolimeric Films of Cassava Starch with Incorporation of Clay Modified by Ionic Exchange and its Application as a Coating in a Fruit

Oliveira, Victor Rafael Leal; Xavier, Tálisson Davi Noberto; Araújo, Nicolas Oliveira; Almeida, José Gustavo Lima; Aroucha, Edna Maria Mendes; Santos, Francisco Klebson Gomes; Leite, Ricardo Henrique de Lima; Silva, Karyn Nathallye de Oliveira

doi:10.1590/1980-5373-MR-2016-0928

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Articles • Mat. Res. 20 (Suppl 2) • 2017 • https://doi.org/10.1590/1980-5373-MR-2016-0928 linkcopy

Evaluation of Biopolimeric Films of Cassava Starch with Incorporation of Clay Modified by Ionic Exchange and its Application as a Coating in a Fruit

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Coatings technologies with biopolymeric films are effective in maintaining the chemical and sensory characteristics of several fruits. Cassava starch is an attractive biopolymeric because of its renewable characteristics and low cost, but it has a high transfer rate of water vapor. Hydrophilic compounds of organically modified montmorillonite clay by ion exchange can be used to improve the limiting properties of starch in exchange for additives such as lipids. The solutions prepared with 5% m/v starch / 5% m/m cationic / anionic clay and uncoated were applied in caja fruit, harvested at physiological maturity, selected for absence of defects and color uniformity. The experimental design was performed with four storage times (0, 3, 6 and 9 days). For the maturation index, there was an isolated effect of the type of coating and storage time, showing the composite films of modified cationic clay with greater MI of the fruits in comparison to the control fruits.

Keywords:
Biopolymeric films; cassava starch; ion exchange; caja fruit; maturation index

Film	WVP (x10^-2 g.s^-1.m^-1.Pa^-1)	Solubility (%)	Opacity (%)	Tensile Ttrength (MPa)	Elongation at break (%)
Control	4.18±0.02^a	66.15±0.15^a	45.47±1.09^a	0.74±0.02^c	31.59±0.14^a
Cationic	2.52±0.01^c	42.10±0.24^b	46.16±1.06^a	0.88±0.02^b	20.76±0.12^b
Anionic	2.98±0.02^b	36.31±0.04^c	43.49±1.06^a	1.43±0.08^a	17.49±0.11^c

Treatment	Storage Days
Treatment	3	6	9
Control	6.50±0.06^a	6.94±0.03^a	7.45±0.02^a
Cationic	4.85±0.02^c	5.74±0.03^c	6.07±0.03^c
Anionic	5.14±0.01^b	6.63±0.02^b	7.01±0.01^b

Treatment	Days of Storage
	3			6			9
	a*	b*	c*	a*	b*	c*	a*	b*	c*
Control	-8.6^cA	48.9^bA	49.6^bcA	-0.2^bA	50.7^abA	50.7^bcA	6.0^aA	52.7^aA	53.0^aA
Cationic	-12.4^cC	44.0^bcBC	45.7^bcBC	-7.6^bB	44.2^bcBC	45.8^bcBC	-1.7^aBC	47.1^aBC	47.2^aBC
Anionic	-11.3^cBC	43.3^abBC	44.8^bcBC	-7.0^bBC	45.0^bcBC	45.6^bcBC	-1.5^aBC	48.4^aBC	48.4^aBC

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ABM, ABC, ABPol UFSCar - Dep. de Engenharia de Materiais, Rod. Washington Luiz, km 235, 13565-905 - São Carlos - SP- Brasil. Tel (55 16) 3351-9487 - São Carlos - SP - Brazil
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[TFN1] CAT: Clay with cationic treatment; ANI: Clay with anionic treatment. Different letters in each column indicate the statistical difference (p < 0.05) between treatments.