scholarly journals Antimicrobial Air Filter Coating with Plant Extracts Against Airborne Microbes

2020 ◽  
Vol 10 (24) ◽  
pp. 9120
Author(s):  
Ha Ram Byun ◽  
Seon Young Park ◽  
Ee Taek Hwang ◽  
Byoung In Sang ◽  
Jiho Min ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Plant Extracts ◽  
Photoelectron Spectroscopy ◽  
Micrococcus Luteus ◽  
Polymeric Coating ◽  
Tea Tree Oil ◽  
Air Filters ◽  
Air Filter ◽  
Tea Tree ◽  
Airborne Microbes

Antimicrobial air filters are required to protect humans from the risk of secondary bioaerosol pollution as well as airborne particles. Three plant extracts (tea-tree oil, rosemary, and garlic) were selected to replace antimicrobial chemicals in air filters. The antimicrobial activity of plant extracts was investigated using Micrococcus luteus and Escherichia coli. Phytochemicals present in the three plant extracts were identified using a gas chromatograph coupled with a mass spectrometer. The extracts were spray-coated on polyethylene terephthalate filter surfaces using silicate polymeric coating and evaluated via X-ray photoelectron spectroscopy and a scanning electron microscope with energy dispersive spectroscopy. After coating, an increase of 9.1% in the pressure drop was observed. The strain Micrococcus luteus was used to evaluate the antimicrobial activity of the air filter. After bioaerosol exposure, the tea-tree oil-coated filters immediately induced M. luteus cell inactivation (40–55%), whereas the rosemary and garlic coated filters did not. However, 48 h after exposure, a significant M. luteus inactivation of 99.99%, 99.0%, and 99.9% was recorded for concentrations of 2.89, 6.73, and 11.51 mg/cm2 for the tea-tree, rosemary, and garlic extracts, respectively. The coated filters exhibited high antimicrobial activity, thereby indicating significant potential for application as self-cleaning air filters.

The dynamics and mechanism of the antimicrobial activity of tea tree oil against bacteria and fungi

2016 ◽  
Vol 100 (20) ◽  
pp. 8865-8875 ◽  
Author(s):  
Wen-Ru Li ◽  
Hai-Ling Li ◽  
Qing-Shan Shi ◽  
Ting-Li Sun ◽  
Xiao-Bao Xie ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Tea Tree Oil ◽  
Tea Tree ◽  
Bacteria And Fungi

scholarly journals Evaluation of the antimicrobial activity and compressive strength of a dental cement modified using plant extract mixture

2020 ◽  
Vol 31 (12) ◽  
Author(s):  
Lamia Singer ◽  
Gabriele Bierbaum ◽  
Katja Kehl ◽  
Christoph Bourauel
Keyword(s):  
Antimicrobial Activity ◽  
Compressive Strength ◽  
Plant Extract ◽  
Plant Extracts ◽  
Micrococcus Luteus ◽  
Testing Machine ◽  
Alcoholic Extract ◽  
Dental Cement ◽  
Freeze Dried ◽  
Significant Difference

AbstractLiterature lacks sufficient data regarding addition of natural antibacterial agents to glass ionomer cement (GICs). Hence, the aim of the study was to increase the antimicrobial properties of GICs through its modification with mixture of plant extracts to be evaluated along with an 0.5% chlorohexidine-modified GIC (CHX-GIC) with regard to biological and compressive strength properties. Conventional GIC (freeze-dried version) and CHX were used. Alcoholic extract of Salvadora persica, Olea europaea, and Ficus carcia leaves were prepared using a Soxhlet extractor for 12 h. The plant extract mixture (PE) was added in three different proportions to the water used for preparation of the dental cement (Group 1:1 PE, 2:1 PE, and 1:2 PE). Specimens were then prepared and tested against the unmodified GIC (control) and the 0.5% CHX-GIC. Chemical analysis of the extract mixture was performed using Gas chromatography–mass spectrometry. Antimicrobial activity was evaluated using agar diffusion assay against Micrococcus luteus and Streptoccocus mutans. Compressive strength was evaluated according to ISO 9917-1:2007 using a Zwick testing machine at a crosshead speed of 0.5 mm/min. Antimicrobial activity against Streptoccocus mutans was significantly increased for all the extract-modified materials compared to the unmodified cement, and the highest concentration was comparable to the CHX-GIC mixture. The activity against Micrococcus luteus was also significantly increased, but only for the material with the highest extract concentration, and here the CHX-GIC group showed statistically the highest antimicrobial activity. Compressive strength results revealed that there was no statistically significant difference between the different mixtures and the control except for the highest tested concentration that showed the highest mean values. The plant extracts (PEs) enhanced the antimicrobial activity against S. mutans and also against M. luteus in the higher concentration while compressive strength was improved by addition of the PE at higher concentrations.

The antimicrobial activity of tea tree oil

1994 ◽  
Vol 160 (4) ◽  
pp. 236-236 ◽  
Author(s):  
Christine F Carson ◽  
Thomas V Riley
Keyword(s):  
Antimicrobial Activity ◽  
Tea Tree Oil ◽  
Tea Tree

Antimicrobial activity of tea tree oil nanoparticles against American and European foulbrood diseases agents

2014 ◽  
Vol 17 (3) ◽  
pp. 343-347 ◽  
Author(s):  
Roberto Christ Vianna Santos ◽  
Leonardo Quintana Soares Lopes ◽  
Camilla Filippi dos Santos Alves ◽  
Viviane Pedroso Fausto ◽  
Kauana Pizzutti ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Tea Tree Oil ◽  
Tea Tree ◽  
European Foulbrood

scholarly journals COMPARISON OF ANTIMICROBIAL EFFECT OF VARIOUS OILS MIXED WITH ZINC OXIDE – AN EX VIVO, IN VITRO STUDY

2021 ◽  
Vol 24 (2) ◽  
pp. 87-93
Author(s):  
Faizal C. Peedikayil ◽  
◽  
Akhila Ansari ◽  
Chandru TP ◽  
Soni Kottayi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Zinc Oxide ◽  
Enterococcus Faecalis ◽  
Primary Teeth ◽  
Coconut Oil ◽  
Antimicrobial Effect ◽  
Tea Tree Oil ◽  
Cinnamon Oil ◽  
Tea Tree ◽  
Infected Root

Background. Success of endodontic treatment depends on complete elimination and various factors such as the antimicrobial activity of the obturating materials. Therefore a study was conducted to find the most prevalent species in the infected canals of primary teeth and to compare the antimicrobial effect of zinc oxide with various oils against most prevalent root canal pathogens. Materials and method. The study was conducted on 100 children in the age group of 3 to 12 years with infected root canal in primary teeth. The sample was subjected to various microbiological analysis to identify the colonies. Following identification, the most common organism was taken and antimicrobial activity of zinc oxide eugenol, zinc oxide with coconut oil, zinc oxide with peppermint oil, zinc oxide with cinnamon oil, zinc oxide with tea tree oil on plates were tested. The zone of inhibition was measured and datas were tested for statistical significance. Results. Enterococcus faecalis was the most prevalent organism. It was seen that zinc oxide with tea tree oil had shown maximum antimicrobial activity against Enterococcus faecalis followed by zinc oxide with coconut oil, zinc oxide with peppermint oil, zinc oxide with cinnamon oil and zinc oxide with eugenol. Conclusions. The study shows that Enterococcus faecalis was the most prevalent microbe in the infected root canals of primary molars. Zinc oxide with oil mixtures also has shown significant antimicrobial activity against Enterococcus faecalis when compared to zinc oxide eugenol.

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