scholarly journals Chitosan/Thyme Oil Systems as Affected by Stabilizing Agent: Physical and Antimicrobial Properties

Coatings ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 165 ◽  
Author(s):  
Jana Sedlaříková ◽  
Magda Janalíková ◽  
Ondřej Rudolf ◽  
Jana Pavlačková ◽  
Pavlína Egner ◽  
...  
Keyword(s):  
Essential Oil ◽  
Antimicrobial Properties ◽  
Barrier Properties ◽  
Tween 20 ◽  
Stabilizing Agents ◽  
Chitosan Matrix ◽  
Thyme Essential Oil ◽  
Hydrophilic Lipophilic Balance ◽  
Film Forming ◽  
Chitosan Films

Antimicrobial biopolymer films and coatings are of great interest for many applications. Different chitosan systems were prepared and characterized to evaluate the effect of their composition on the physical and antimicrobial properties. Three types of emulsifiers (Tween 20, 80, and 85) were used as stabilizing agents, combined with thyme essential oil (from two producers) applied as an active substance. A predominant role of the applied stabilizer and its hydrophilic–lipophilic balance value was proven. The incorporation of thyme essential oil and surfactant into the chitosan matrix led to a significant decrease of particle size in film-forming solutions, as well as a thickness increase and the enhancement of the barrier properties in chitosan films. Antimicrobial effects were provided even at the lowest tested concentration of thyme essential oil. Hence, the prepared chitosan films represent promising candidates in antimicrobial packaging applications.

Evaluation of filter media covered with spun fibres and containing thyme essential oil with antimicrobial properties

2020 ◽  
pp. 1-10
Author(s):  
Ana Isabela Pianowski Salussoglia ◽  
Clovis Wesley Oliveira de Souza ◽  
Eduardo Hiromitsu Tanabe ◽  
Mônica Lopes Aguiar
Keyword(s):  
Essential Oil ◽  
Antimicrobial Properties ◽  
Filter Media ◽  
Thyme Essential Oil

scholarly journals Chitosan/Essential Oils Formulations for Potential Use as Wound Dressing: Physical and Antimicrobial Properties

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2223 ◽  
Author(s):  
Elaine Pereira dos Santos ◽  
Pedro Henrique Medeiros Nicácio ◽  
Francivandi Coêlho Barbosa ◽  
Henrique Nunes da Silva ◽  
André Luís Simões Andrade ◽  
...  
Keyword(s):  
Essential Oil ◽  
Antimicrobial Properties ◽  
Wound Dressings ◽  
Qualitative Assessment ◽  
Diffusion Method ◽  
Mechanical Resistance ◽  
Film Forming ◽  
Good Transparency ◽  
The Impact

Film-forming emulsions and films, prepared by incorporating different concentrations of clove essential oil (CEO) and melaleuca essential oil (MEO) into chitosan (CS) were obtained and their properties were evaluated. Film-forming emulsions were characterized in terms of qualitative assessment, hydrogen potential and in vitro antibacterial activity, that was carried by the agar diffusion method, and the growth inhibition effects were tested on the Gram-positive microorganism of Staphylococcus aureus, Gram-negative microorganisms of Escherichia coli, and against isolated fungi such as Candida albicans. In order to study the impact of the incorporation of CEO and MEO into the CS matrix, the appearance and thickness of the films were evaluated. Furthermore, Fourier transform infrared spectroscopy (FTIR), contact angle measurements, a swelling test, scanning electron microscopy and a tensile test were carried out. Results showed that the film-forming emulsions had translucent aspect with cloudy milky appearance and showed antimicrobial properties. The CEO had the highest inhibition against the three strains studied. As regards the films’ properties, the coloration of the films was affected by the type and concentration of bioactive used. The chitosan/CEO films showed an intense yellowish coloration while the chitosan/MEO films presented a slightly yellowish coloration, but in general, all chitosan/EOs films presented good transparency in visible light besides flexibility, mechanical resistance when touched, smaller thicknesses than the dermis and higher wettability than chitosan films, in both distilled water and phosphate-buffered saline (PBS). The interactions between the chitosan and EOs were confirmed by. The chitosan/EOs films presented morphologies with rough appearance and with EOs droplets in varying shapes and sizes, well distributed along the surface of the films, and the tensile properties were compatible to be applied as wound dressings. These results revealed that the CEO and MEO have a good potential to be incorporated into chitosan to make films for wound-healing applications.

Antimicrobial, Mechanical, and Barrier Properties of Cassava Starch−Chitosan Films Incorporated with Oregano Essential Oil

2009 ◽  
Vol 57 (16) ◽  
pp. 7499-7504 ◽  
Author(s):  
Franciele M. Pelissari ◽  
Maria V. E. Grossmann ◽  
Fabio Yamashita ◽  
Edgardo Alfonso G. Pineda
Keyword(s):  
Essential Oil ◽  
Barrier Properties ◽  
Cassava Starch ◽  
Oregano Essential Oil ◽  
Chitosan Films

The activity of thyme essential oil against Acinetobacter spp.

2011 ◽  
Vol 6 (3) ◽  
pp. 405-413 ◽  
Author(s):  
Monika Łysakowska ◽  
Andrzej Denys ◽  
Monika Sienkiewicz
Keyword(s):  
Essential Oil ◽  
Antimicrobial Properties ◽  
Diffusion Method ◽  
Thymus Vulgaris ◽  
Bacterial Strains ◽  
Acinetobacter Baumanii ◽  
Strong Activity ◽  
Thyme Essential Oil ◽  
Acinetobacter Spp ◽  
Multiresistant Strains

AbstractThe aim of this work was to investigate the antimicrobial properties of thyme essential oil against clinical multiresistant strains of Acinetobacter spp. The antibacterial activity of oil was tested against standard and clinical bacterial strains of Acinetobacter genus. The agar diffusion method was used to check the inhibition of microbial growth at various concentrations of the oil from Thymus vulgaris. Susceptibility testing to antibiotics and chemotherapeutics was prepared using the disc-diffusion method. Identification of bacterial strains was carried out with the Vitek system and confirmed by PCR for Acinetobacter baumanii gyrB gene. The results of experiments showed that the oil from T. vulgaris exhibited an extremely strong activity against all of the clinical strains of Acinetobacter. Thyme oil demonstrated a very good efficacy against multiresistant strains of tested bacteria. Essential oils seems to be an excellent alternative for synthetic preparations and that is reason for an extensive assessment of their antimicrobial activity.

scholarly journals Review on Polysaccharides Used in Coatings for Food Packaging Papers

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 566 ◽  
Author(s):  
Petronela Nechita ◽  
Mirela Roman (Iana-Roman)
Keyword(s):  
Food Packaging ◽  
Negative Impact ◽  
Antimicrobial Properties ◽  
Barrier Properties ◽  
Extraction Methods ◽  
Packaging Materials ◽  
Paper Coatings ◽  
Marine Biomass ◽  
Film Forming ◽  
Packaging Paper

Paper and board show many advantages as packaging materials, but the current technologies employed to obtain adequate barrier properties for food packaging use synthetic polymers coating and lamination with plastic or aluminium foils—treatments which have a negative impact on packaging sustainability, poor recyclability and lack of biodegradability. Recently, biopolymers have attracted increased attention as paper coatings, which can provide new combinations in composite formulas to meet the requirements of food packaging. The number of studies on biopolymers for developing barrier properties of packaging materials is increasing, but only a few of them are addressed to food packaging paper. Polysaccharides are viewed as the main candidates to substitute oil-based polymers in food paper coating, due to their film forming ability, good affinity for paper substrate, appropriate barrier to gases and aroma, and positive effect on mechanical strength. Additionally, these biopolymers are biodegradable, non-toxic and act as a matrix for incorporation additives with specific functionalities for coated paper (i.e., active-antimicrobial properties). This paper presents an overview on the availability and application of polysaccharides from vegetal and marine biomass in coatings for foods packaging paper. The extraction methods, chemical modification and combination routes of these biopolymers in coatings for paper packaging are discussed.

Antioxidant and antimicrobial properties of thyme essential oil encapsulated in zein particles

2015 ◽  
Vol 30 (5) ◽  
pp. 392-398 ◽  
Author(s):  
Tugca Bilenler ◽  
Incilay Gokbulut ◽  
Kubra Sislioglu ◽  
Ihsan Karabulut
Keyword(s):  
Essential Oil ◽  
Antimicrobial Properties ◽  
Thyme Essential Oil

scholarly journals Antimicrobial Properties of Thyme Essential Oil on Salmonella Typhimurium

2021 ◽  
Vol 35 (S1) ◽  
Author(s):  
Katherine Gonzalez ◽  
Amanda Johnson ◽  
Vanessa Gonsalves ◽  
Anael Santos
Keyword(s):  
Essential Oil ◽  
Salmonella Typhimurium ◽  
Antimicrobial Properties ◽  
Thyme Essential Oil

Inhibitory Effect of Chitosan Films Incorporated with 1,8-Cineole on Salmonella Attached on Model Food Surface

2012 ◽  
Vol 506 ◽  
pp. 599-602 ◽  
Author(s):  
H. Thangvaravut ◽  
N. Chiewchan ◽  
S. Devahastin
Keyword(s):  
Essential Oil ◽  
Pathogenic Bacteria ◽  
Active Component ◽  
Fruits And Vegetables ◽  
Safety Margin ◽  
Inhibitory Effect ◽  
Film Forming ◽  
Model Food ◽  
Film Preparation ◽  
Chitosan Films

Antimicrobial packaging is a form of active packaging that has been developed to extend the shelf life of fresh fruits and vegetables by increasing the safety margin of such products via controlling the growth of pathogenic bacteria. A feasibility study of using chitosan-based films incorporated with 1,8-cineole, a representative active component in natural essential oil, for controlling the growth of Salmonella on a model food surface was conducted in this work. 1,8-cineole was added to the film forming solution at 2, 3, 4% (w/w). After drying at 40 °C and aging at 25 °C (75% RH) for 48 h, the concentrations of 1,8-cineole in the dried films were 37 - 121 ppm. The inhibitory effect of the prepared films was tested against Salmonella Anatum grown on Nutrient Agar (NA) at 30 °C. It was found that addition of 2 3% (w/w) 1,8-cineole during film preparation retarded the growth of Salmonella. In the case of film prepared by adding 4% (w/w) 1,8-cineole during film preparation, no growth was observed on the XLD agar after the first day of incubation.

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