scholarly journals Long-Lasting Photocatalytic and Antimicrobial Activity of Cotton Towels Modified with TiO2 and ZnO Nanoparticles

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 952
Author(s):  
Beata Gutarowska ◽  
Edyta Matyjas-Zgondek ◽  
Piotr Kulpiński ◽  
Marta Mroczyńska-Florczak ◽  
Eugeniusz Rutkowski
Keyword(s):  
Antimicrobial Activity ◽  
Zno Nanoparticles ◽  
Radiation Intensity ◽  
Antimicrobial Activities ◽  
Photocatalytic Efficiency ◽  
Light Bulb ◽  
E Coli ◽  
Self Cleaning ◽  
Fabric Surface ◽  
Zno And Tio2 Nanoparticles

This study aimed to evaluate the durability of the photocatalytic and antimicrobial activities of ZnO and TiO2 nanoparticles (NPs)-modified 100% cotton terry textiles. SEM-EDX confirmed the long-lasting durability of the washing materials, and TGA analysis revealed that ZnO and TiO2 NPs can be found on the terry fabric surface; however, the amount of NPs decreased 10 times after 15 washes and 1.6 times after the subsequent 15 washes. The efficiency of self-cleaning properties and antimicrobial activity against five microorganisms (Staphylococcus aureus ATCC 6538, Escherichia coli ATCC 10536, Candida albicans ATCC 10231, Aspergillus niger ATCC 16404, and Bacillus subtilis NCAIM 01644) depended on UVA/B radiation intensity. The increase in UVA/B radiation intensity from 400 to 1400 µW/cm2 significantly increases the effectiveness of photocatalysis. Long-lasting self-cleaning properties characterised the tested fabric; however, stronger photocatalytic efficiency was observed in light with a greater intensity of UVA/B radiation. At the UVA/B radiation intensity of 1400 µW/cm2, a biocidal effect (R = 100%) against all tested microorganisms (E. coli, S. aureus. B. subtilis, C. albicans, and A. niger) was observed on the surface of materials. The lower UVA/B radiation intensity (400 µW/cm2) and 30 wash cycles reduce the antimicrobial activity of the material (R = 65.4–99.4%) for B. subtilis, C. albicans, and A. niger. The antimicrobial activity of washed materials modified with TiO2/ZnO nanoparticles can be increased by irradiation with a light bulb (1400 µW/cm2).

scholarly journals Synergistic Antimicrobial Activities of Combinations of Vanillin and Essential Oils of Cinnamon Bark, Cinnamon Leaves and Cloves

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1406
Author(s):  
Rita Cava-Roda ◽  
Amaury Taboada-Rodríguez ◽  
Antonio López-Gómez ◽  
Ginés Benito Martínez-Hernández ◽  
Fulgencio Marín-Iniesta
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oils ◽  
Food Packaging ◽  
Antimicrobial Effect ◽  
Antimicrobial Activities ◽  
Inhibitory Effects ◽  
Cinnamon Bark ◽  
E Coli ◽  
Pure Compounds ◽  
Main Component

Plant bioactive compounds have antimicrobial and antioxidant activities that allow them to be used as a substitute for synthetic chemical additives in both food and food packaging. To improve its sensory and bactericidal effects, its use in the form of effective combinations has emerged as an interesting possibility in the food industry. In this study, the antimicrobial activities of essential oils (EOs) of cinnamon bark, cinnamon leaves, and clove and the pure compounds vanillin, eugenol, and cinnamaldehyde were investigated individually and in combination against Listeria monocytogenes and Escherichia coli O157:H7. The possible interactions of combinations of pure compounds and EOs were performed by the two-dimensional checkerboard assay and isobologram methods. Vanillin exhibited the lowest antimicrobial activity (MIC of 3002 ppm against L. monocytogenes and 2795 ppm against E. coli O157:H7), while clove and cinnamon bark EOs exhibited the highest antimicrobial activity (402–404 against L. monocytogenes and 778–721 against E. coli O157:H7). For L. monocytogenes, pure compound eugenol, the main component of cinnamon leaves and clove, showed lower antimicrobial activity than EOs, which was attributed to the influence of the minor components of the EOs. The same was observed with cinnamaldehyde, the main component of cinnamon bark EO. The combinations of vanillin/clove EO and vanillin/cinnamon bark EO showed the most synergistic antimicrobial effect. The combination of the EOs of cinnamon bark/clove and cinnamon bark/cinnamon leaves showed additive effect against L. monocytogenes but indifferent effect against E. coli O157:H7. For L. monocytogenes, the best inhibitory effects were achieved by cinnamon bark EO (85 ppm)/vanillin (910 ppm) and clove EO (121 ppm)/vanillin (691 ppm) combinations. For E. coli, the inhibitory effects of clove EO (104 ppm)/vanillin (1006 ppm) and cinnamon leaves EO (118 ppm)/vanillin (979 ppm) combinations were noteworthy. Some of the tested combinations increased the antimicrobial effect and would allow the effective doses to be reduced, thereby offering possible new applications for food and active food packaging.

Screening of Antimicrobial Activity and Cytotoxic Effects of Two Cladonia Species

2013 ◽  
Vol 68 (5-6) ◽  
pp. 191-197 ◽  
Author(s):  
Birkan Açıkgöz ◽  
İskender Karaltı ◽  
Melike Ersöz ◽  
Zeynep M. Coşkun ◽  
Gülşah Çobanoğlu ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Activities ◽  
Chloroform Extract ◽  
Cytotoxic Effects ◽  
Minimal Inhibitory Concentrations ◽  
E Coli ◽  
Methanol Extracts ◽  
Gram Positive Bacteria

The present study explores the antimicrobial activity and cytotoxic effects in culture assays of two fruticose soil lichens, Cladonia rangiformis Hoffm. and Cladonia convoluta (Lamkey) Cout., to contribute to possible pharmacological uses of lichens. In vitro antimicrobial activities of methanol and chloroform extracts against two Gram-negative bacteria (Pseudomonas aeruginosa and Escherichia coli), two Gram-positive bacteria (Enterococcus faecalis and Staphylococcus aureus), and the yeast Candida albicans were examined using the paper disc method and through determination of minimal inhibitory concentrations (MICs). The data showed the presence of antibiotic substances in the chloroform and the methanol extracts of the lichen species. The chloroform extracts exhibited more signifi cant antimicrobial activity than the methanol extracts. However, a higher antifungal activity was noted in the methanol extract of C. rangiformis. The maximum antimicrobial activity was recorded for the chloroform extract of C. convoluta against E. coli. The cytotoxic effects of the lichen extracts on human breast cancer MCF-7 cells were evaluated by the trypan blue assay yielding IC50 values of ca. 173 and 167 μg/ml for the extracts from C. rangiformis and C. convoluta, respectively.

Trigona laeviceps Propolis from Thailand: Antimicrobial, Antiproliferative and Cytotoxic Activities

2009 ◽  
Vol 37 (05) ◽  
pp. 855-865 ◽  
Author(s):  
Supawadee Umthong ◽  
Songchan Puthong ◽  
Chanpen Chanchao
Keyword(s):  
Antimicrobial Activity ◽  
Methanolic Extract ◽  
Water Extract ◽  
Antimicrobial Activities ◽  
Diffusion Method ◽  
Cytotoxic Activities ◽  
E Coli ◽  
Anticancer Properties ◽  
Crude Extracts ◽  
Sw620 Cells

Propolis is one of the natural bee products which has long been used as a crude preventative and prophylactic medicine, and has been reported to possess antibacterial, antiviral, anti-inflammatory, antioxidative and anticancer properties. Propolis of the stingless bee, Trigona laeviceps, was extracted by water or methanol at 35% (w/v) yielding a crude water or a methanolic extract at 60 and 80 mg/ml, respectively, which is 17.1 and 22.9% (w/w) of the total propolis, respectively. The antimicrobial activity of both crude extracts was assayed on four selected pathogenic microbes by using the agar well diffusion method. The results suggested that both water and methanolic crude extracts have some antimicrobial activities, water extract has greater antimicrobial activity than methanolic extract. The relative order of sensitivity of the four microbes were, however, the same between the two extracts from the most to least sensitive, S. aureus > E. coli ≫ C. albicans ⋙ A. niger, with indeed no observed growth inhibition of A. niger at all. Antiproliferative and cytotoxic affects were tested on the colon carcinoma cell line, SW620, using the three parameters: (1) MTT assay; (2) cell morphology; and (3) the fragmentation of genomic DNA. The water extract of propolis showed a higher antiproliferative activity than that of methanolic extract to SW620 cells, additionally both appeared to cause cell death by necrosis.

scholarly journals Synthesis of Plant-Mediated Silver Nanoparticles UsingDioscorea batatasRhizome Extract and Evaluation of Their Antimicrobial Activities

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
P. C. Nagajyothi ◽  
K. D. Lee
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Room Temperature ◽  
Antimicrobial Activities ◽  
Gram Positive ◽  
Gram Negative ◽  
Synthesis Of Nanoparticles ◽  
E Coli ◽  
Synthesize Silver Nanoparticles ◽  
Dioscorea Batatas

The eco-friendly synthesis of nanoparticles through various biological means helps to explore various plants for their ability to synthesize silver nanoparticles (AgNPs). Here we have synthesized AgNPs by using rhizome extract ofDioscorea batatasat as well as room temperature (). AgNPs were characterized under UV-vis spectrophotometer, SEM, FTIR, XRD, and EDX. The antimicrobial activity of AgNPs was evaluated on gram positive (B. substilisandS. aureus), gram negative (E. coli), and fungi (S. cerivisaeandC. albicans). At room temperature,S. cerivisaeandC. albicanswere found to be more susceptible to AgNPs than at .

Antimicrobial activity of raw soybean, soybean flour and roasted soybean extracted by ethanol-hexane method

2017 ◽  
Vol 119 (10) ◽  
pp. 2277-2286 ◽  
Author(s):  
Sireerat Laodheerasiri ◽  
Nirasha Horana Pathirage
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Activities ◽  
Diffusion Method ◽  
Antimicrobial Compounds ◽  
Soybean Flour ◽  
Hexane Extraction ◽  
Disk Diffusion Method ◽  
Content Type ◽  
E Coli ◽  
Inhibitory Compounds

Purpose The purpose of this paper is to determine the antimicrobial compounds extracted from various types of soybean materials; raw soybean, soybean flour and roasted soybean. Bacteria growth inhibition was tested in E.coli and S. aureus by disk diffusion method. Efficiency of antimicrobial activities were compared among the extracted solution. Design/methodology/approach Soybean (Glycine max) isoflavones contain the ability to inhibit the growth of many strains of microorganisms. The solid-liquid extraction, ethanol-hexane extraction, was modified to isolate the inhibitory compounds from the three different types of soybean materials. All crude extracts at various concentrations performed under different extracted solutions (75, 50, 25, 12.5, 6.25 and 3.125 percent) were tested with E. coli. and S. aureus to determine the antimicrobial activities and the minimum inhibition concentration (MIC). Disk diffusion method was chosen to study the antimicrobial activity of isoflavones. Findings Soybean flour extract inhibited the growth of E. coli and S. aureus more effective than roasted soybean and raw soybean, respectively. The MIC of inhibitory compounds extracted from soybean flour was 6.25 percent (0.031 mg/ml), roasted soybean was 25 percent (0.125 mg/ml) and raw soybean was 50 percent (0.250 mg/ml). Crude extracts of soybean flour and roasted soybean showed better results than raw soybean. All the three of extracted soybeans inhibited the growth of E. coli better than S. aureus. Originality/value Ethanol-hexane extraction was successfully used to isolate the antimicrobial compounds from raw soybean, soybean flour and roasted soybean. Comparison of antimicrobial activity showed that soybean flour contained the highest inhibition activity.

Fabrication of cotton fabrics with durable antibacterial activities finishing by Ag nanoparticles

2018 ◽  
Vol 89 (5) ◽  
pp. 867-880 ◽  
Author(s):  
Yunping Wu ◽  
Yan Yang ◽  
Zhijie Zhang ◽  
Zhihua Wang ◽  
Yanbao Zhao ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Antibacterial Properties ◽  
Antimicrobial Activities ◽  
Cotton Fabrics ◽  
Synthesis Process ◽  
Ag Nps ◽  
X Ray ◽  
E Coli ◽  
Fabric Surface

In this paper, we propose a facile and mild route to prepare size-tunable silver nanoparticles (Ag NPs) and their finishing application on fabrication of antibacterial cotton fabrics. The as-prepared Ag NPs, with an average particles size of 2.3 nm, show the minimal inhibitory concentration of 7.8 µg/mL and the minimum bactericidal concentration of 15.6 µg/mL, respectively. In this study, sodium citrate served as a stabilizing agent to prevent Ag NP agglomeration in the synthesis process, and citric acid acted as a binder to fix Ag NPs on the cotton fabrics through chemical bonds in the finishing process. The results of Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy (UV-vis), X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy demonstrate that Ag NPs have been fixed and well dispersed on the cotton fabric surface. Ag contents in the hybrid fabrics were measured by the techniques of inductively coupled plasma atomic emission spectroscopy and UV-vis, and the antibacterial properties of hybrid fabrics were tested by the shake flask and agar diffusion plate method. It is found that the Ag NP coated cotton fabrics exhibit excellent antimicrobial activities against both the Gram-negative bacterium of Escherichia coli (E. coli) and the Gram-positive bacterium of Staphylococcus aureus ( S. aureus). The percentages of reduction bacteria remain at 91.8% and 98.7% for S. aureus and E. coli, respectively, even after 50 cycles of consecutive laundering, which indicates that the antibiotic performance of the as-fabricated hybrid fabrics is also durable.

scholarly journals Efficiency of Basil Essential Oil Antimicrobial Agents under Different Shading Treatments and Harvest Times

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1574
Author(s):  
Zoran S. Ilić ◽  
Lidija Milenković ◽  
Ljubomir Šunić ◽  
Nadica Tmušić ◽  
Jasna Mastilović ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oil ◽  
Essential Oils ◽  
Antimicrobial Agents ◽  
Antimicrobial Activities ◽  
Plant Production ◽  
Exposure Control ◽  
Harvest Time ◽  
E Coli ◽  
Growing Conditions

The aim of this study was to determine the antimicrobial activity of essential oils obtained from sweet basil (Ocimum basilicum L. cv. ‘Genovese’) cultivated in the open field under different shading conditions (red, blue, and pearl nets with a shade index of 50% and full sunlight exposure (control plants)), harvested at different times. The antimicrobial activity of basil essential oils (BEOs) obtained from all samples was determined for four microorganisms, while determinations for an additional five microorganisms included samples from non-shaded plants, plants grown under red and pearl nets, and second harvest of plants grown under blue net. Basil essential oil exhibited antimicrobial activity surpassing the activity of relevant commercial antibiotics regardless of growing conditions in the case of B. cereus, K. pneumoniae and C. albicans, while superior antimicrobial activity was exhibited in the case of essential oils from plants grown under blue nets in the case of S. aureus, E. coli and P. vulgaris. The influence of the application of colored shading nets was highly significant (p < 0.01) in the cases of all analyzed microorganisms except C. albicans and P. aeruginosa, while the influence of harvest time was proven in the cases of all microorganisms except K. pneumoniae. ANOVA proved that antimicrobial activities are highly dependent on the methods of plant production, shading treatment, and harvest time. Obtained results are discussed in relation to previously determined composition and yield of essential oils from basil grown under shade nets and harvested in different periods.

Synthesis and Antimicrobial Activity of Some New N-(1H-benzimidazol-2- yl)-2-mercaptoacetamide Derivatives

2018 ◽  
Vol 15 (2) ◽  
pp. 154-159
Author(s):  
Asaf Evrim Evren ◽  
Sinem Tekinkoca ◽  
Leyla Yurttas
Keyword(s):  
Antimicrobial Activity ◽  
Antifungal Activity ◽  
Bacterial Resistance ◽  
Fungal Infections ◽  
Antimicrobial Activities ◽  
Benzimidazole Derivatives ◽  
Standard Drug ◽  
E Coli ◽  
Pharmacological Significance ◽  
Anti Fungal

Background: Due to multi-drug, extended-drug, and pandrug resistance phenotypes, bacterial resistance to antibiotics and fungal infections are a general health issue. Particulary, increase of fungal infections due to secondary cause of human diseases have been observed. An extensive variety of benzimidazole derivatives have been characterized for their chemotherapeutic significance. Benzimidazole derivatives have received important attention because of pharmacological significance during current years, especially antimicrobial, anti-fungal, antitubercular, antioxidant, anti-Alzheimer's disease and antihypertension activities. Methods: Some N-(1H-benzimidazol-2-yl)-2-mercaptoacetamide derivatives (2a-h) were synthesised and evaluated for their antimicrobial activity. The title compounds were gained by reacting N-(1H-benzimidazol-2-yl)-2-chloroacetamide with some substituted 2-mercapto heterocyclic rings. The synthesised compounds were investigated for their antimicrobial activities against C. albicans (ATCC 24433), C. krusei (ATCC 6258), C. glabrata (ATCC90030), C. parapsilosis (ATCC 22019), E. coli (ATCC 25922), E. coli (ATCC 35218), E. feacalis (ATCC 51299), E. feacalis (ATCC 29212), S. aureus (ATCC 25923), K. pneumoniae (ATCC 700603), P. aeruginosa (ATCC 27853). Results: The compounds showed high antifungal activity when compared with standard drug ketoconazole. In addition, all compounds (MIC 100 µg/mL) showed inhibitor activity against P. aeruginosa at two fold concentration of chloramphenicol (MIC 50 µg/mL). Also, compounds 2a, 2c and 2e (MIC: 50 µg/mL) have equal effect against E. coli (ATCC 35218) and more effective than other compounds (MIC of chloramphenicol: 100 µg/mL). Conclusıon: All compounds showed notable activity. Compounds have determined to possess higher antifungal activity than antibacterial activity. Additionally, compounds 2a with 1-methyltetrazole, 2c with benzothiazole and 2e with 6-chlorobenzothiazole moieties were found as the most active compounds.

Preliminary phytochemical screening and antimicrobial activities of plant extract of Elaeocarpus ganitrus Roxb.

2016 ◽  
Vol 5 (09) ◽  
pp. 4885 ◽  
Author(s):  
Khushbu Pandey ◽  
Mahendra Singh* ◽  
Bharat Pandey ◽  
Anshulika Upadhyaya ◽  
Kamal K. Pande
Keyword(s):  
Antimicrobial Activity ◽  
Rhizopus Oryzae ◽  
Antimicrobial Activities ◽  
Diffusion Method ◽  
Phytochemical Analysis ◽  
Phytochemical Screening ◽  
Bacterial Strains ◽  
E Coli ◽  
Antibacterial And Antifungal ◽  
Anti Fungal

The present study was carried out for phytochemical screening of principle bioactive compounds and antimicrobial activity in Elaeocarpus ganitrus Roxb., Phytochemical analysis revealed the presence of saponin, terpenoid, steroid, saponin, flavonoid, tannin and alkaloid. The petroleum, ether, chloroform, methanol, acetone and aqueous extracts were subjected to antimicrobial activity against bacterial strains Staphylococcus aureus, Pseudomonas, E. coli and Bacillus subtilis against anti-fungal strains A.awamori, A.fumigatus, Rhizopus oryzae, Trichoderma viridae and C.oryzae. The antibacterial and antifungal activity was evaluated by disc-diffusion method.

Synthesis and Structures of Halo-Substituted Aroylhydrazones with Antimicrobial Activity

2012 ◽  
Vol 65 (4) ◽  
pp. 343 ◽  
Author(s):  
Mei Zhang ◽  
Dong-Mei Xian ◽  
Hai-Hua Li ◽  
Ji-Cai Zhang ◽  
Zhong-Lu You
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Bacillus Subtilis ◽  
Inhibitory Concentration ◽  
Antimicrobial Activities ◽  
X Ray Diffraction ◽  
X Ray ◽  
E Coli ◽  
Diphenyl Tetrazolium Bromide

A series of new halo-substituted aroylhydrazones have been prepared and structurally characterized by elemental analysis, 1H NMR, 13C NMR, and IR spectra, and single crystal X-ray diffraction. The compounds were evaluated for their antibacterial (Bacillus subtilis, Staphylococcus aureus, Escherichia coli, and Pseudomonas fluorescence) and antifungal (Candida albicans and Aspergillus niger) activities by the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) method. Among the tested compounds, N′-(2-chloro-5-nitrobenzylidene)-2-fluorobenzohydrazide showed the most effective antimicrobial activity with minimum inhibitory concentration values of 0.82, 2.5, 1.7, 15.2, and 37.5 μg mL–1 against B. subtilis, S. aureus, E. coli, P. fluorescence, and C. albicans, respectively. The biological assay indicated that the presence of the electron-withdrawing groups in the aroylhydrazones improved their antimicrobial activities.

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