Optimization of Physical, Optical and Barrier Properties of Films Made from Cassava Starch and Rosemary Oil

Abstract

In this study, films from cassava starch and rosemary oil were prepared by using the casting method. Glycerol was used as plasticizer and tween 80 as surfactant. The influence of Cassava starch (Cs), Rosemary oil (Ro), Surfactant (Sf) concentrations and Thickness of film (Tf) on the mechanical, optical, and barrier properties of cassava starch films was studied applying the Response Surface Methodology. The response variables were optimized by using second order polynomial models with satisfactory fit and coefficient of determination (R 2 ) values (> 81%). The optimized conditions with the goal of maximizing mechanical properties and minimizing barrier and optical properties and desirability function (0.9796) were Cs = 3 g/100 g solution, Ro = 4 g/100 g Cs, Sf = 69 g/100 g Ro and Tf = 0.05 ± 0.001 mm. The films produced under these conditions displayed high mechanical strength (16.7 MPa), young´s modulus (2911.4 MPa), low elongation at break (0.2%), low water vapor transmission (0.8 × 10 −14 g/Pa s m), low solubility (33.24%), and low opacity (16%). These results provided good mechanical, barrier, and optical properties, compared to films based on other starch resources.

Recent advances in starch‐based films toward food packaging applications: Physicochemical, mechanical, and functional properties

“…Computational techniques like principal component analysis (PCA) or central composite design and response surface methodology have been implemented to rapidly deduce the impact of multiple independent variables. The predictive power of these techniques has been quite promising and will likely continue to see widespread use in this field for developing models that allow for the determination of formulations producing target film properties (Luchese, Benelli, et al., 2018; Navia Porras, Gordillo Suarez, Hernandez Umana, & Poveda Perdomo, 2019; Silva et al., 2019). Delving into the fundamental physical phenomena that give rise to differences in mechanical properties (Table 2, entry 56) also offers valuable insight and has been the subject of numerous recent works (Dai et al., 2019; Domene‐Lopez et al., 2019; Gutierrez et al., 2019; Luchese, Benelli, et al., 2018; Maniglia et al., 2019).…”

“…The optimized conditions produced a film that was, within standard deviation, identical to the predicted results for TS, EAB, and EM. Surface optimization was also successfully performed to determine the optimal starch, rosemary oil, and emulsifier concentration in the FFS while also considering optimal film thickness of the resultant cassava starch‐based film (Navia Porras et al., 2019). The film that was produced was quite close to the predicted values for TS, EM, EAB, and water vapor transmission although some values were slightly outside of the standard deviation.…”

Synthesis, Characterization, and Histological Evaluation of Chitosan-Ruta Graveolens Essential Oil Films

“…The water vapor transmission was determined gravimetrically by following the method E96-05 (ASTM, 2005) [100]. A glass permeation cell filled with silica gel (0% RH) was employed for test.…”

Physicochemical properties of enzymatically prepared resistant starch from maize flour and its use in cookies formulation

“…[42] Moreover, protease pre-treatment during enzymatic synthesis leads to the removal of hydrophobic protein hence decrease oil absorption. The native starch showed increased oil uptake due to the varietal differences in the ratio of amylose and amylopectin, chain length distribution [43] , larger surface area, particles porosity, and presence of greater hydrophobic proteins [44] which assist oil absorption.…”