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Showing 3 results for Chitosan
Investigation of anti-microbial properties of chitosan-Tio2 Nanocomposite and its use on sterile gauze pads
Saadatmand M M (msc), Yazdanshenas M E (phd), Rezaei-Zarchi S (phd), Yousefi-Telori B (bsc), Negahdary M (msc),
Volume 6, Issue 1 (4-2012)
Abstract
Abstract Background and objectives: In this research, the formation of chitosan-TiO2 nanocomposite and its antibacterial effect on Escherichia coli and staphylococcus aureus was investigated Material and Methods: to study the results, we used Scanning electron microscopy (SEM) and transition electron microscopy (TEM) images, infrared (IR) spectroscopy and ultraviolet-visible. Optical Density (OD) was also measured by spectrophotometer then the effect of this nano composite, in the vicinity of aforementioned bacteria, on the sterilized gauze in solid Muller Hinton Agar and TSB liquid mediums was assessed Results: The mentioned nanocomposite was formed with the composition of 4mg/ml Chitosan concentration and 2% titanium dioxide concentration. Finally, we observed that this nanocomposite near 100% could prevent bacterial growth and in the presence of this material did not grow any bacteria. Conclusion: chitosan-Tio2 Nanocomposite can be useful on culture medium and sterilized gauze to control pathologic bacteria. Key words: nanocomposite, nanochitosan, titanium dioxide, antibacterial, sterilized gauze
Effect of Chitosan, Aluminum Oxide and Silver Nanoparticles on Antibacterial, Deodorizing and Moisture Absorption Properties of Nonwoven Polyester Fabrics for Use in Medical Textiles
Mohammad Khajeh Mehrizi , Hasan Mashroteh, Narges Nabizadeh Moghadam Noghabi,
Volume 10, Issue 4 (7-2016)
Abstract

ABSTRACT

         Background and Objective: Hospital clothing and textiles have a great role in providing medical services to patients. Hospital services would not be possible without using these textiles. The aim of this study was to prepare non-woven polyester for use in medical textiles.

         Methods: In this study, most important expected properties of hospital clothing were created on polyester fabrics via various stages of finishing using chemicals such as calcium chloride, sodium alginate, chitosan and nanoparticles of silver nitrate and aluminum oxide. Antibacterial (activity against Staphylococcus aureus), deodorizing and wicking properties of samples were evaluated using nano-biomaterials via standard tests.

          Results: The water absorption rate of nonwoven samples that were finished with chitosan significantly improved. The results also showed favorable level of antimicrobial activity caused by silver nitrate and chitosan. In addition, deodorizing activity was observed in all samples. However, silver nitrate-finished samples had higher deodorizing activity. The capillary action of all samples reduced after completion of all finishing procedures.

          Conclusion: The results show that the use of chitosan and alginate along with nanoparticles of silver nitrate and aluminum oxide can be effective in achieving the desired properties of medical textiles.

        Keywords: Medical textiles, antibacterial substances, chitosan, silver nitrate.


Antimicrobial Effect of Gel-Type Nanoemulsion of Chitosan Coating Containing Essential Oils of Zataria multiflora and Bunium persicum on Pseudomonas Artificially Inoculated onto Salmon Fillets
Mehrdad Rezaeian, Saeid Khanzadi, Mohammad Hashemi, Mohammad Azizzadeh,
Volume 15, Issue 3 (5-2021)
Abstract
Background and objectives: Chitosan is a preservative that is commonly used in food packaging due to forming a film with antimicrobial activity. Many antimicrobial agents have been used to control the growth of different bacteria, fungi and yeasts in food products using chitosan coating. The present research was conducted to examine inhibitory effects of a coating incorporated with the essential oils of Zataria multiflora (ZEO) and Bunium persicum (BEO) on the growth of Pseudomonas artificially inoculated onto salmon fillets over a period of 12 days at 4 °C.
Methods: The antibacterial activity of BEO against P. aeruginosa was evaluated using the microdilution method via determining minimum inhibitory concentration and minimum bactericidal concentration. For the food model investigation, three P. aeruginosa strains were inoculated onto trout fillets as culture cocktail to assess their survival over 12 days of storage.
Results: The results indicated that ZEO and BEO had stronger inhibitory effect on P. aeruginosa in trout fillets when applied along with gel type nano-emulsion of chitosan solution. The separate use of each of these substances also significantly inhibited the growth of these pathogenic bacteria compared with the control. In addition, the use of chitosan coating without any antimicrobial agent affected the growth of P. aeruginosa.
Conclusion: The gel type nano-emulsion of chitosan coating containing ZEO and BEO can be applied on foodstuff, particularly fish and its products, as an antimicrobial agent.
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