A study on the antimicrobial efficacy of RF oxygen plasma and neem extract treated cotton fabrics

Purpose The dyeing of cellulosic and proteinous fibers with natural and synthetic colorants usually needs large amounts of metal salts to promote the dyeing procedure. To get rid of the necessity to use metal salts, plasma treatment and subsequent attachment of chitosan biopolymer were considered as green processes for surface functionalization of wool and cotton. The purpose of this paper is to investigate the effect of oxygen plasma treatment and attachment of chitosan on the dyeability of wool and cotton fabrics using walnut and weld as model natural dyes, as well as C.I. reactive blue 50 and C.I. acid blue 92 as model synthetic dyes. Design/methodology/approach Wool and cotton fabrics were modified with oxygen plasma and coated with chitosan solution. The un-modified and modified samples were dyed with the above-mentioned dyes under constant conditions. The color strength, color coordinates and fastness properties of the dyed samples were determined and compared. Findings The results showed that oxygen plasma treatment could improve the dyeability and fastness properties of wool and cotton fibers when dyed with all of the above-mentioned dyes. Attachment of chitosan to the plasma-treated samples significantly improved the dyeability of wool and cotton fibers with walnut, acid and reactive dyes. The fastness properties of the dyed samples were enhanced by plasma treatment and chitosan coating. Originality/value This study uses plasma treatment as an environmentally friendly pre-treatment for attachment of chitosan on wool and cotton. This process improved the dyeing properties of both fibers. The use of metal salts in not needed for dyeing of wool and cotton according to the investigated process.

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Fabrication of thermoresponsive cotton fabrics using oxygen plasma graft polymerisation of N-isopropylacrylamide

Materials Research Innovations ◽

10.1179/1432891714z.000000000460 ◽

2014 ◽

Vol 18 (sup2) ◽

pp. S2-488-S2-493

Author(s):

Y. Q. Li ◽

J. Q. Liu

Keyword(s):

Oxygen Plasma ◽

Cotton Fabrics

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Nano-Biotechnology: Developing Nano-silver coated cotton fabrics by means of biosynthesis of silver nanoparticles using Aspergillus terrues strain (MTCC9618) against staphylococcus aureus

International Journal of Nanotechnology and Nanomedicine ◽

10.33140/ijnn.04.02.01 ◽

2019 ◽

Vol 4 (2) ◽

Keyword(s):

Staphylococcus Aureus ◽

Silver Nanoparticles ◽

Cost Effective ◽

Cotton Fabrics ◽

Disk Diffusion ◽

Antimicrobial Efficacy ◽

Disk Diffusion Assay ◽

Pharmaceutical Industries ◽

Diffusion Assay ◽

Coated Cotton

Biosynthesis of silver nanoparticles, especially fungal mediated method is given attention in the development of new drugs for resistance pathogens, molecular diagnosis, drug delivery therapy and in catalytic sensor due to its cost effective, none toxicity and eco-friendly. The present study focused on the fungal mediated biosynthesis of silver nanoparticles using Aspergillus terrues strain (MTCC 9618). The synthesized nanoparticles was monitored by spectrophotometer SEM, XRD and its band gap was determined by Tuac equation. After while the fungal crude cells was exposed to 5mM silver nitrate the reduction reaction was recorded according to red shift colorchange. Based on ultra violet spectrophotometeran absorbance was recorded in a distinct pick around 430nm - 450nm and also the band gab was determined using Tuac equationsuch that 2.08eV, 2.02eV, 2.0eV and 1.96eV at about 10min, 30min, 12h and 24h respectively. The AgNPs coated cotton fabrics was developed through direct exposed to extracellular metabolites and 100ppm colloidal solution of AgNPs. The antimicrobial efficacy of the synthesized AgNPs coted cotton fabrics against gram positive Hospital staphylococcus aureus pathogenstrains was conducted by disk diffusion assay. In which the antimicrobial efficacy of coated cotton-Ag against human pathogens was proofed how the staphylococcus aureus had susceptible too and (16mm) zone of inhibition was recorded. Based on disk diffusion assay at 10ug/mL minimum inhibition concentration (MIC)10.5 mm inhibition zone was noted consequently, this study accomplished that Aspergillus terreus strain mediated biosynthesis of silver nanoparticles is cost effective, time saving, eco-friendly and small spherical (<10nm) had produced against to Physio-chemical means. The bio-synthesized silver nanoparticles cotton fabrics publicized that a higher efficacy of antimicrobial activity against staphylococcus aureus and the result was considerable suggested in widely range used in textile and pharmaceutical industries to enrich durability, strength, quality of products against a clinical pathogens application as well bad odor and spoilage of dusts from fabrics.

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Physico-chemical Analysis of Oxygen Plasma and Enzyme Treated Cotton Fabrics

International Journal of Innovative Research in Science Engineering and Technology ◽

10.15680/ijirset.2015.0402014 ◽

2015 ◽

Vol 04 (02) ◽

pp. 94-102

Author(s):

E.Nithya, R.Radhai,S.r Prasanna, K.Vaideki, R.Rajendran, S.Jayakuma

Keyword(s):

Chemical Analysis ◽

Oxygen Plasma ◽

Cotton Fabrics ◽

Physico Chemical

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Comparative Evaluation of Antimicrobial Efficacy, Depth of Penetration into Dentinal Tubules and Effect on Microhardness of Root Dentin by Sodium Hypochlorite, Neem Extract and Gau Ark as Root Canal Irrigants: An In-vitro Study

JOURNAL FOR CLINICAL AND DIAGNOSTIC RESEARCH ◽

10.7860/jcdr/2020/44988.14147 ◽

2020 ◽

Author(s):

Dhanshri Shashikant Khade ◽

ND Shashikiran ◽

Sachin Gugawad ◽

Namrata Gaonkar ◽

Swapnil Taur ◽

...

Keyword(s):

Penetration Depth ◽

Sodium Hypochlorite ◽

Normal Saline ◽

In Vitro Study ◽

Antimicrobial Efficacy ◽

Depth Of Penetration ◽

Neem Extract ◽

Dentinal Tubules ◽

Root Dentin

Introduction: Disinfection of root canals can be done using intracanal irrigants. Sodium hypochlorite or NaOCL is amongst the most commonly used endodontic irrigants. Due to disadvantages of NaOCl, there is a need to identify a more biocompatible irrigant. Aim: To evaluate the antibacterial efficacy, depth of penetration into dentinal tubules and effect on microhardness of root dentin when NaOCl, Neem extract, Gau ark and Normal saline used as an irrigant against Enterococcus faecalis. Materials and Methods: Prepared Neem leaf extract, 3% NaOCl, Gau ark, Normal saline, Brain Heart Infusion (BHI) broth and BHI Agar were used in the present in-vitro study conducted from August-October 2019. Antimicrobial efficacy was measured by agar well diffusion method on 10 petriplates. After access opening and biomechanical preparation, each tooth sample was irrigated with 5 mL of irrigant. Samples were decoronated and roots were split along the longitudinal axis to check penetration depth of irrigants under stereomicroscope for 40 teeth samples. After preparation of 40 teeth sample, 2 mm dentin discs prepared were embedded in acrylic resin. Microhardness was checked under Vickers Microhardness (VHN) tester after samples were irrigated. Statistical Analysis of Variance and Tukey post-hoc test were used. Results: Zones of inhibition were highest with NaOCl (7.66 mm). Irrigants penetration depth into dentinal tubules was significant with NaOCl with average value 0.35 mm. Microhardness of root dentin of saline was 145.90 VHN, followed by Neem 136.59 VHN which was then followed by Gau ark 123.05 VHN hence, Neem has lesser effect on microhardness value as compared to NaOCl and Gau ark. There was statistically significant difference among four groups regarding antimicrobial efficacy, depth of penetration into dentinal tubules and microhardness of root dentin. Conclusion: Neem extract showed significant antimicrobial property as compared to Gau ark and normal saline, good penetration depth and less effect on microhardness of root dentin. Herbal irrigant like Neem extract can be used as a root canal irrigant.

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Etching of Polymers by Oxygen Plasma

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100101797 ◽

1968 ◽

Vol 26 ◽

pp. 408-409

Author(s):

Virgil Peck ◽

W. L. Carter

Keyword(s):

Molecular Weight ◽

Oxygen Plasma ◽

Flow Time ◽

Microscopical Study ◽

Surface Layers ◽

Organic Vapors ◽

Sample Position ◽

Accuracy Of Measurement ◽

Bulk Polymers ◽

Electron Microscopical

Any electron microscopical study of the morphology of bulk polymers has throughout the years been hampered by the lack of any real ability to produce meaningful surface variations for replication. True etching of polymers should show crystalline and amorphous regions in some form of relief. The use of solvents, acids, organic vapors, and inert ion bombardment to etch samples has proved to be useful only in limited applications. Certainly many interpretations of these results are subject to question.The recent use of a radiofrequency (R. F.) plasma of oxygen to degrade and remove organic material with only minor heating has opened a new possibility for etching polymers. However, rigid control of oxygen flow, time, current, and sample position are necessary in order to obtain reproducible results. The action is confined to surface layers; the molecular weight of the polymer residue after heavy etching is the same as the molecular weight of the polymer before attack, within the accuracy of measurement.

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