Enhanced Photocatalytic Antibacterial Properties of TiO2 Nanospheres with Rutile/Anatase Heterophase Junctions and the Archival Paper Protection Application

TiO2 has been generally studied for photocatalytic sterilization, but its antibacterial activities are limited. Herein, TiO2 nanospheres with rutile/anatase heterophase junctions are prepared by a wet chemical/annealing method. The large BET surface area and pore size are beneficial for the absorption of bacteria. The rutile/anatase heterojunctions narrow the bandgap, which enhances light absorption. The rutile/anatase heterojunctions also efficiently promote the photogenerated carriers’ separation, finally producing a high yield of radical oxygen species, such as •O2– and •OH, to sterilize bacteria. As a consequence, the obtained TiO2 nanospheres with rutile/anatase heterojunctions present an improved antibacterial performance against E. coli (98%) within 3 h of simulated solar light irradiation, exceeding that of TiO2 nanospheres without annealing (amorphous) and TiO2 nanospheres annealing at 350 and 550 °C (pure anatase). Furthermore, we design a photocatalytic antibacterial spray to protect the file paper. Our study reveals that the TiO2 nanospheres with rutile/anatase heterojunctions are a potential candidate for maintaining the durability of paper in the process of archival protection.

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Green Synthesis and Incorporation of Sericin Silver Nanoclusters into Electrospun Ultrafine Cellulose Acetate Fibers for Anti-Bacterial Applications

Polymers ◽

10.3390/polym13091411 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1411

Author(s):

Mujahid Mehdi ◽

Huihui Qiu ◽

Bing Dai ◽

Raja Fahad Qureshi ◽

Sadam Hussain ◽

...

Keyword(s):

Electron Microscopy ◽

Green Synthesis ◽

Cellulose Acetate ◽

Antibacterial Properties ◽

Vital Role ◽

Silver Nanoclusters ◽

Composite Fibers ◽

E Coli ◽

Antibacterial Performance ◽

Field Emission Electron Microscopy

Fiber based antibacterial materials have gained an enormous attraction for the researchers in these days. In this study, a novel Sericin Encapsulated Silver Nanoclusters (sericin-AgNCs) were synthesized through single pot and green synthesis route. Subsequently these sericin-AgNCs were incorporated into ultrafine electrospun cellulose acetate (CA) fibers for assessing the antibacterial performance. The physicochemical properties of sericin-AgNCs/CA composite fibers were investigated by transmission electron microscopy (TEM), field emission electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR) and wide X-ray diffraction (XRD). The antibacterial properties of sericin-AgNCs/CA composite fibers against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were systematically evaluated. The results showed that sericin-AgNCs incorporated in ultrafine CA fibers have played a vital role for antibacterial activity. An amount of 0.17 mg/mL sericin-AgNCs to CA fibers showed more than 90% results and elevated upto >99.9% with 1.7 mg/mL of sericin-AgNCs against E. coli. The study indicated that sericin-AgNCs/CA composite confirms an enhanced antibacterial efficiency, which could be used as a promising antibacterial product.

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Antibacterial Properties of CdO Nano-Cubes Synthesized via Microwave Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.829.294 ◽

2013 ◽

Vol 829 ◽

pp. 294-298 ◽

Cited By ~ 3

Author(s):

Mehrdad Rashidzadeh

Keyword(s):

Structural Information ◽

Cadmium Oxide ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Raw Material ◽

X Ray Diffraction ◽

Gram Negative ◽

E Coli ◽

Oxidation Reduction ◽

Cdo Nanoparticles

High purity Cadmium (Cd) metal was used as raw material and placed in a microwave susceptor. an evaporation/oxidation process occurs under exposure to microwave in less than 2 minutes. Then, Evaporated cadmium reacted with oxygen and cadmium oxide was collected on the inner surface of a glassy container that was placed a few centimeters above the susceptor. Morphological and structural information of As-synthesized CdO nanopowder, were investigated via SEM and X-ray diffraction (XRD) spectroscopy. The antibacterial activities of different concentration of the CdO nanoparticles were tested by treating Escherichia coli (Gram negative) cultures with CdO nanoparticles. The Study indicates that cadmium oxide nanoparticles show effective antibacterial activity toward the gram-negative bacterium E. coli. Electrochemical properties of as-synthesized powder were investigated via linear and two vertex cyclic voltammetery in the presence of ethanol, a pair of Oxidation/reduction peaks were achieved.

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Synthesis of quinoline attached-furan-2(3H)-ones having anti-inflammatory and antibacterial properties with reduced gastro-intestinal toxicity and lipid peroxidation

Journal of the Serbian Chemical Society ◽

10.2298/jsc110131142a ◽

2011 ◽

Vol 76 (12) ◽

pp. 1617-1626 ◽

Cited By ~ 6

Author(s):

Mohammad Alam ◽

Priya Sarkar ◽

Asif Husain ◽

Akranth Marella ◽

M.S. Zaman ◽

...

Keyword(s):

Lipid Peroxidation ◽

Phosphorus Oxychloride ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Dimethyl Formamide ◽

Significant Activity ◽

Acylation Reaction ◽

Reaction Conditions ◽

E Coli ◽

Anti Inflammatory

A series of 3-[2-chloroquinolin-3-yl)methylene]-5-aryl-furan-2(3H)-ones {3(a-p)} were synthesized. The required 3-(substitutedbenzoyl) propionic acids {2(a-d)} were prepared under Friedal Craft acylation reaction conditions. The substituted 2-chloroquinoline-3-carbaldehydes {1(a-d)} were synthesized by reaction of substitutedphenylethanone-oxime with phosphorus oxychloride in presence of dimethyl formamide using the Vilsmeir Haack reaction method. These compounds were screened for their anti-inflammatory and antibacterial activities along with their ulcerogenic and lipid peroxidation potentials. The compounds that showed significant anti-inflammatory activity were further screened for their analgesic activity. The compounds were less toxic in terms of ulcerogenicity as compared to a standard, which was also supported by lipid peroxidation studies. The antibacterial activities were performed against Staphylococcus aureus and Escherichia coli. Compounds 3f, 3n and 3o showed significant activity against both S. aureus and E. coli having an MIC value of 6.25?g mL-1.

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Antibacterial Activity of Endophytic Fungi from Sembukan (Paederia foetida L.) Leaves

Science & Technology Indonesia ◽

10.26554/sti.2021.6.3.189-195 ◽

2021 ◽

Vol 6 (3) ◽

pp. 189-195

Author(s):

Hary Widjajanti ◽

Christina Vivid Handayani ◽

Elisa Nurnawati

Keyword(s):

Antibacterial Activity ◽

Secondary Metabolites ◽

Endophytic Fungi ◽

Antimicrobial Agents ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

In Vitro Tests ◽

E Coli ◽

Paederia Foetida

The antibiotic resistance of phatogenic bacteria has become a serious health problem and has encouraged the search for novel and effective antimicrobial metabolites. Meanwhile, endophytic fungi have great potential as a natural source for antimicrobial agents. The endophytic fungi that live in plant tissue produces secondary metabolites which potentially act as an antibacterial compound. The isolation of fungi for antibacterial sources reduces the large amount of plant as a source of antibacterial agents. Hence, this study aims to obtain endophytic fungi isolates from Paederia foetida L. that are capable of producing secondary metabolites as antibacterial, carry out in vitro tests to verify the antibacterial properties of secondary metabolites of the Paederia foetida L. endophytic fungi, and identify the potential of Paederia foetida L. endophytic fungi in producing antibacterial compounds. The antibacterial activity was tested against Escherichia coli ATCC8739 and Staphylococcus aureus ATCC6538 while seven isolates of endophytic fungi that potentially produced antibacterial were obtained from Sembukan (P. foetida L.). The results showed that antibacterial activities of SL1, SL4 and SL6 secondary metabolites against S. aureus ATCC6538 and E. coli ATCC8739 were moderate to strong activities. Furthermore, the Minimum Inhibition Concentration (MIC) of secondary metabolites extract of SL1 against S. aureus ATCC6538 value was 250 ????g/mL while the values of MIC extract of SL4 against S. aureus ATCC6538 and E. coli ATCC8739 were 125 ????g/mL and 250 ????g/mL respectively and MIC extract of SL6 against E. coli ATCC8739 value was 125 ????g/mL. The secondary metabolites extract of SL1 isolate were alkaloid and tannin, SL4 were phenolic and alkaloid while SL6 isolate were alkaloid and terpenoid. Hence, endophytic fungi SL1 isolate was identified as Fusarium sp., SL4 as Dematophora sp., and SL6 isolate as Acremonium sp.

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SYNTHESIS, CHARACTERIZATION AND IN VITRO ANTIMICROBIAL EVALUATION OF SOME NOVEL BENZIMIDAZOLE DERIVATIVES BEARING HYDRAZONE MOIETY

Asian Journal of Pharmaceutical and Clinical Research ◽

10.22159/ajpcr.2017.v10s4.21328 ◽

2017 ◽

Vol 10 (16) ◽

pp. 1

Author(s):

Jayanta Sarma ◽

Gurvinder Singh ◽

Mukta Gupta ◽

Reena Gupta ◽

Bhupinder Kapoor

Keyword(s):

Antibacterial Properties ◽

Antimicrobial Properties ◽

Aromatic Aldehydes ◽

Antibacterial Activities ◽

Antimicrobial Activities ◽

Benzimidazole Derivatives ◽

E Coli ◽

Antimicrobial Evaluation ◽

Antibacterial Potential

Objective: The synthesis of novel benzimidazole-hydrazone derivatives has been carried out based on the previous findings that both these pharmacophores possess potent antimicrobial activities. The antibacterial properties of synthesized derivatives were screened against both Gram-positive and Gram-negative bacteria.Methods: O-phenylenediamine on condensation with substituted aromatic acids in polyphosphoric acid gave benzimidazole nucleus which on reaction with ethyl chloroacetate and hydrazine hydrate in two different steps resulted in the formation of substituted acetohydrazides. The targeted compounds 6a-l were synthesized by reaction of substituted acetohydrazides with aromatic aldehydes and screened for their antibacterial potential by cup-plate method.Results: The synthesized benzimidazole-hydrazones exhibited moderate to strong antibacterial activities against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Pseudomonas aeruginosa. The compounds 6a-6f were found to be most effective against S. aureus, E. coli, and P. aeruginosa. Among all the synthesized compounds, the zone of inhibition of 6f in highest concentration, i.e., 100 μg/ml were found to be >31 mm against all the stains of bacteria.Conclusion: The antibacterial results revealed that the synthetized derivatives have significant antimicrobial properties and further structure activity relationship studies may develop more potent and less toxic molecules.

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Antibacterial Properties of Nootkatone Against Gram-Positive Bacteria

Natural Product Communications ◽

10.1177/1934578x19859999 ◽

2019 ◽

Vol 14 (6) ◽

pp. 1934578X1985999 ◽

Cited By ~ 1

Author(s):

Takayoshi Yamaguchi

Keyword(s):

Staphylococcus Aureus ◽

Bactericidal Activity ◽

Antibacterial Effect ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Potential Candidate ◽

High Concentration ◽

Gram Positive ◽

Gram Positive Bacteria ◽

Wall Structures

Nootkatone is one of the sesquiterpenes contained in citrus peels, especially in grapefruits. It is known that nootkatone has various physiological activities such as antioxidative and antifibrotic actions. This study showed that nootkatone, a natural sesquiterpene, exhibited antibacterial activities against Gram-positive bacteria such as Staphylococcus aureus, Enterococcus faecalis, Listeria monocytogenes, Corynebacterium diphtheriae, and Bacillus cereus, with the antibacterial effect against C. diphtheriae being most pronounced. However, no growth-inhibitory effects or bactericidal activity was observed against Gram-negative bacteria. In addition, the bactericidal activity of nootkatone at a high concentration was observed against Gram-positive bacilli. These results suggested that nootkatone may exert an antibacterial effect by targeting cell wall structures or a particular metabolite. Moreover, even at a low concentration (0.25 mM), nootkatone was capable of inhibiting biofilm formation by Staphylococcus aureus. Thus, this study demonstrated antibacterial efficacy for nootkatone against Gram-positive bacteria, indicating that nootkatone could be a potential candidate for the development of new antibacterial agents.

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Palygorskite-Based Organic–Inorganic Hybrid Nanocomposite for Enhanced Antibacterial Activities

Nanomaterials ◽

10.3390/nano11123230 ◽

2021 ◽

Vol 11 (12) ◽

pp. 3230

Author(s):

Aiping Hui ◽

Fangfang Yang ◽

Rui Yan ◽

Yuru Kang ◽

Aiqin Wang

Keyword(s):

Zno Nanoparticles ◽

Antibacterial Properties ◽

Stability Limit ◽

Antibacterial Activities ◽

Combined System ◽

Inorganic Hybrid ◽

Plant Essential Oils ◽

E Coli ◽

Antibacterial Material ◽

Inorganic Nanocomposites

A synergistic antibacterial strategy is effective in enhancing the antibacterial efficacy of a single antibacterial material. Plant essential oils (PEOs) are safe antibacterial agents. However, some of their characteristics such as intense aroma, volatility, and poor thermal stability limit their antibacterial activity and applications. In this paper, five kinds of PEOs were incorporated onto ZnO/palygorskite (ZnO/PAL) nanoparticles by a simple adsorption process to form organic–inorganic nanocomposites (PEOs/ZnO/PAL) with excellent antibacterial properties. TEM and SEM analyses demonstrated that ZnO nanoparticles uniformly anchored onto the surface of rod-like PAL, and that the structure of ZnO/PAL maintained after the incorporation of ZnO nanoparticles and PEOs. It was found that carvacrol/ZnO/palygorskite (CAR/ZnO/PAL) exhibited higher antibacterial activities than other PEOs/ZnO/PAL nanocomposites, with minimum inhibitory concentration (MIC) values of 0.5 mg/mL and 1.5 mg/mL against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), respectively. Moreover, the antibacterial efficiency of CAR/ZnO/PAL nanocomposites was superior to that of ZnO/PAL and pure CAR, demonstrating the synergistic effect that occurs in the combined system. PAL serving as a carrier for the combination of organic PEOs and ZnO nanoparticles is an effective strategy for enhanced, clay-based, organic–inorganic hybrid antibacterial nanocomposites.

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Uncatalyzed Synthesis of New Antibacterial Bisarylidene Meldrum's Acid Derivatives Functionalized with Ether Groups

Letters in Organic Chemistry ◽

10.2174/1570178616666181203145211 ◽

2019 ◽

Vol 16 (10) ◽

pp. 818-824

Author(s):

Elham Moosazadeh ◽

Enayatollah Sheikhhosseini ◽

Dadkhoda Ghazanfari ◽

Shahla Soltaninejad

Keyword(s):

Staphylococcus Aureus ◽

Mass Spectra ◽

Condensation Reaction ◽

Antibacterial Activities ◽

High Yield ◽

Meldrum's Acid ◽

Meldrum’S Acid ◽

E Coli ◽

Ft Ir ◽

Meldrum's Acid Derivatives

A series of new bisarylidene Meldrum’s acid derivatives (3a-i) were prepared in high yield by a condensation reaction between Meldrum's acid and ether functionalized dibenzaldehyde, without any catalyst. Regardless of the nature of the substitution, all the reactions were completed within 2-3 hours in ethanol at reflux condition. In the reactions, the column purification of the products was not needed. The FT-IR, 1H-NMR, 13C-NMR and mass spectra confirm the structure of the products. Furthermore, the antibacterial activities of some synthesized compounds were investigated. According to the results, these compounds showed good activities against Staphylococcus aureus, Bacillus cereus, E. coli and Pseudomonas aeruginosa.

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Short Communication: Antioxidant and antibacterial properties of tree fern Cyathea contaminans

Biodiversitas Journal of Biological Diversity ◽

10.13057/biodiv/d210548 ◽

2020 ◽

Vol 21 (5) ◽

Author(s):

Ahmad Faizal ◽

Intan Taufik ◽

Anisah Firda Rachmani ◽

Alda Wydia Prihartini Azar

Keyword(s):

Short Communication ◽

Antioxidant Activities ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Herbal Remedies ◽

Gas Chromatography Mass Spectrometry ◽

Tree Fern ◽

Medicinal Uses ◽

E Coli ◽

Mature Leaves

Abstract. Faizal A, Taufik I, Rchman AF, Azar AWP. 2020. Short Communication: Antioxidant and antibacterial properties of tree fern Cyathea contaminans. Biodiversitas 21: 2201-2205. Cyathea contaminans (Wall. ex Hook) Copel is a tree fern used in traditional practices as herbal remedies to treat different kinds of diseases. To explore its further medicinal uses, we designed a study to determine the antioxidant and antibacterial activities of polar and non-polar extracts of this fern. The fern leaves (mature fronds), young fronds, and hairs were collected from Tangkuban Perahu Nature Park, West Java, Indonesia, and were extracted by methanol 80% or n-hexane. Antioxidant activity was evaluated by DPPH (1,1-diphenyl-2-picrylhydrazyl) assay, whereas antibacterial activity was measured by growth inhibition of Escherichia coli and Staphylococcus aureus. Results showed that methanol extract from mature leaves (fronds) exhibits weak to very strong antioxidant activities (IC50 37.13-225.19 µg/mL), whilst hairs and young fronds showed weak activities, i.e. IC50 179.50-255.49 µg/mL and IC50 544.27->2000 µg/mL, respectively. Hexane fraction from fronds was active against E. coli and S. aureus (43.92% and 46.8%), and from hairs against E. coli (48.1%) in concentration of 250 µg/mL. Gas Chromatography-Mass Spectrometry (GC-MS) analysis indicated that active compounds from fronds extract were dominated by 2H-tetrazole, 5-(thiophen-2yl) methyl (14,29 %), 2-thiophene acetic acid, 2-methyl phenyl ester (14,54%), and phenol, 2,6-bis(1,1-dimethyl ethyl)-4-methyl (10.54%). This study concluded that mature leaves (fronds) of C. contaminans is the potential to be used as antioxidant and antibacterial agents.

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WO3-Doped TiO2Coating on Charcoal Activated with Increase Photocatalytic and Antibacterial Properties Synthesized by Microwave-Assisted Sol-Gel Method

Journal of Nanotechnology ◽

10.1155/2017/7902930 ◽

2017 ◽

Vol 2017 ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

Weerachai Sangchay

Keyword(s):

Methylene Blue ◽

Antibacterial Activity ◽

Water Purification ◽

Sol Gel ◽

Antibacterial Properties ◽

Antibacterial Activities ◽

Gel Method ◽

Sol Gel Method ◽

E Coli ◽

Microwave Assisted

WO3-doped TiO2coating on charcoal activated (CA) was prepared by microwave-assisted sol-gel method. The samples calcined at the temperature of 500°C for 2 h with a heating rate of 10°C/min were characterized by XRD, EDS, and SEM. The photocatalytic and antibacterial activities of WO3-doped TiO2coating on CA were investigated by means of degradation of a methylene blue (MB) solution and against the bacteriaE. coli, respectively. The effects of WO3concentration were discussed. The 1% WO3-doped TiO2coated CA seems to exhibit the higher photocatalytic and antibacterial activity than other samples. The WO3-doped TiO2coated on CA are expected to be applied as a photocatalyst for water purification.

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