Abstract
Polymers of natural origin and their derivatives are currently used as biomaterials because they are easily available and their properties can be tailored to meet specific requirements. The essential oils are widely used as antimicrobials. The objective of this study was to evaluate the in-vitro antimicrobial efficiency of cellulose acetate (CA) films incorporated with the essential oils of garlic (GR) and oregano (OR) on the microorganisms Staphylococcus aureus, Escherichia coli, Listeria monocytogenes, Salmonella choleraesuis and Pseudomonas aeruginosa and characterize the films as to their mechanical, optical and structural properties. Four treatments were evaluated, Control, Film 1 (50 ml OR.100 g-1 CA) Film 2 (50 ml OR + 30 ml GR.100 g-1 CA) and Film 3 (50 ml OR + 50 ml GR.100 g-1 CA). The concentration of oils influenced the mechanical parameters of maximum load, relative deformation at maximum load and elastic modulus, resulting in weaker, less rigid and more flexible films. There was an increase in L* and b* in films incorporated with garlic and oregano essential oil. The films incorporated with a mixture of oregano and garlic essential oils exhibited inhibition against all organisms tested.
Highlights
Polymers of natural origin and their derivatives are currently widely used as biomaterials because they are available in a variety of compositions and their properties can be tailored to meet specific requirements (Abdel-Naby & Aboubshait, 2013)
Scanning electron microscopy (SEM) In general, cellulose acetate films incorporated with the essential oils of oregano and garlic presented insoluble points of dispersion (Figure 1)
The presence of agglomerates can be due to partial solubilization of cellulose acetate and the essential oils (Moreira Gonçalves et al, 2020) since they were solubilized in acetone, a hydrophilic solvent with low solubility for lipidic compounds
Summary
Polymers of natural origin and their derivatives are currently widely used as biomaterials because they are available in a variety of compositions and their properties can be tailored to meet specific requirements (Abdel-Naby & Aboubshait, 2013). There is a growing use of these biopolymers in the development of packaging biodegradable as an alternative to the use of polymers from non-renewable sources for application in food packaging. The most widely studied polymers for this purpose are chitosan, pectin, starch, polylactic acid, whey protein isolate and cellulose (Assis et al, 2020; Carvalho et al, 2019; Cerqueira et a., 2011; de Castro e Silva et al, 2019; de Oliveira et al, 2018; de Oliveira et al, 2019; Porta et al, 2011; Silva et al, 2015). Cellulose acetate (CA) is a semi-synthetic polymer, being one of the first cellulose derivatives studied and commercialized.
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