Nanomaterials

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3 pages, 175 KiB

Open AccessEditorial

Antibacterial Activity of Nanoparticles

by Vi Khanh Truong, Nghia Phuoc Truong and Scott A. Rice

Nanomaterials 2021, 11(6), 1391; https://doi.org/10.3390/nano11061391 - 25 May 2021

Cited by 5 | Viewed by 2719

Abstract

Antimicrobial resistance (AMR) is predicted to soon become one of the most serious threats to human and animal health [...] Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

Research

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23 pages, 4590 KiB

Open AccessArticle

In-Vitro Antibacterial and Anti-Inflammatory Effects of Surfactin-Loaded Nanoparticles for Periodontitis Treatment

by Athira Johnson, Fanbin Kong, Song Miao, Sabu Thomas, Sabah Ansar and Zwe-Ling Kong

Nanomaterials 2021, 11(2), 356; https://doi.org/10.3390/nano11020356 - 1 Feb 2021

Cited by 26 | Viewed by 4205

Abstract

Periodontitis is an inflammatory disease associated with biofilm formation and gingival recession. The practice of nanotechnology in the clinical field is increased overtime due to its potential advantages in drug delivery applications. Nanoparticles can deliver drugs into the targeted area with high efficiency [...] Read more.

Periodontitis is an inflammatory disease associated with biofilm formation and gingival recession. The practice of nanotechnology in the clinical field is increased overtime due to its potential advantages in drug delivery applications. Nanoparticles can deliver drugs into the targeted area with high efficiency and cause less damages to the tissues. In this study, we investigated the antibacterial and anti-inflammatory properties of surfactin-loaded κ-carrageenan oligosaccharides linked cellulose nanofibers (CO-CNF) nanoparticles. Three types of surfactin-loaded nanoparticles were prepared based on the increasing concentration of surfactin such as 50SNPs (50 mg surfactin-loaded CO-CNF nanoparticles), 100SNPs (100 mg surfactin-loaded CO-CNF nanoparticles), and 200SNPs (200 mg surfactin-loaded CO-CNF nanoparticles). The results showed that the nanoparticles inhibited the growth of Fusobacterium nucleatum and Pseudomonas aeruginosa. The reduction in biofilm formation and metabolic activity of the bacteria were confirmed by crystal violet and MTT assay, respectively. Besides, an increase in oxidative stress was also observed in bacteria. Furthermore, anti-inflammatory effects of surfactin-loaded CO-CNF nanoparticles was observed in lipopolysaccharide (LPS)-stimulated human gingival fibroblast (HGF) cells. A decrease in the production of reactive oxygen species (ROS), transcription factor, and cytokines were observed in the presence of nanoparticles. Collectively, these observations supported the use of surfactin-loaded CO-CNF as a potential candidate for periodontitis management. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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16 pages, 9713 KiB

Open AccessEditor’s ChoiceArticle

Antibacterial Activity of Green-Synthesized Silver Nanoparticles Using Areca catechu Extract against Antibiotic-Resistant Bacteria

by Jeong Su Choi, Hyon Chel Jung, Yeon Jae Baek, Bo Yong Kim, Min Woo Lee, Hyeong Dong Kim and Suhng Wook Kim

Nanomaterials 2021, 11(1), 205; https://doi.org/10.3390/nano11010205 - 14 Jan 2021

Cited by 47 | Viewed by 5206

Abstract

In this work, the antibacterial activity of silver nanoparticles (AgNPs) synthesized using Areca catechu extracts against three species of antibiotic-susceptible and three species of resistant bacteria was investigated. The effects of this plant were more promising when compared with other medicinal plants tested. [...] Read more.

In this work, the antibacterial activity of silver nanoparticles (AgNPs) synthesized using Areca catechu extracts against three species of antibiotic-susceptible and three species of resistant bacteria was investigated. The effects of this plant were more promising when compared with other medicinal plants tested. The hydrothermal extract of Areca catechu was mixed with silver nitrate to synthesize AgNPs. The synthesized particle characteristics were analyzed by UV–Vis spectrophotometry, scanning electron microscopy (SEM), dynamic light scattering (DLS), and Fourier-transform infrared spectroscopy (FT-IR). Minimum inhibitory concentration and minimum bactericidal concentration tests were conducted to confirm antibacterial activity and the results showed that AgNPs synthesized using Areca catechu extracts effectively inhibited the growth of bacterial species. Moreover, the SEM images of the bacterial species treated with AgNPs synthesized with Areca catechu extracts showed that clusters of AgNPs were attached to the surface of the bacterial cell wall, which could induce destruction of the cell membranes. The results suggest that AgNPs synthesized with Areca catechu extracts have the potential to treat antibiotic-resistant bacteria known as the major cause of nosocomial infections. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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12 pages, 2135 KiB

Open AccessArticle

Development of a Bioactive Flowable Resin Composite Containing a Zinc-Doped Phosphate-Based Glass

by Myung-Jin Lee, Young-Bin Seo, Ji-Young Seo, Jeong-Hyun Ryu, Hyo-Ju Ahn, Kwang-Mahn Kim, Jae-Sung Kwon and Sung-Hwan Choi

Nanomaterials 2020, 10(11), 2311; https://doi.org/10.3390/nano10112311 - 22 Nov 2020

Cited by 22 | Viewed by 3472

Abstract

Flowable resins used for dental restoration are subject to biofilm formation. Zinc has antibacterial properties. Thus, we prepared a zinc-doped phosphate-based glass (Zn-PBG) to dope a flowable resin and evaluated the antibacterial activity of the composite against Streptococcus mutans (S. mutans) [...] Read more.

Flowable resins used for dental restoration are subject to biofilm formation. Zinc has antibacterial properties. Thus, we prepared a zinc-doped phosphate-based glass (Zn-PBG) to dope a flowable resin and evaluated the antibacterial activity of the composite against Streptococcus mutans (S. mutans) to extrapolate the preventative effect toward secondary caries. The composites were prepared having 0 (control), 1.9, 3.8, and 5.4 wt.% Zn-PBG. The flexural strength, elastic modulus, microhardness, depth of cure, ion release, inhibition zone size, and number of colony-forming units were evaluated and analyzed using ANOVA. The flexural strength of the control was significantly higher than those of Zn-PBG samples (p < 0.05). However, all samples meet the International Standard, ISO 4049. The microhardness was not significantly different for the control group and 1.9 and 3.8 wt.% groups, but the 5.4 wt.% Zn-PBG group had a significantly lower microhardness (p < 0.05). Further, the composite resins increasingly released P, Ca, Na, and Zn ions with an increase in Zn-PBG content (p < 0.05). The colony-forming unit count revealed a significant reduction in S. mutans viability (p < 0.05) with increase in Zn-PBG content. Therefore, the addition of Zn-PBG to flowable composite resins enhances antibacterial activity and could aid the prevention of secondary caries. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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13 pages, 2146 KiB

Open AccessArticle

Therapeutic Applications of Biostable Silver Nanoparticles Synthesized Using Peel Extract of Benincasa hispida: Antibacterial and Anticancer Activities

by Wafaa E. Soliman, Salman Khan, Syed Mohd Danish Rizvi, Afrasim Moin, Heba S. Elsewedy, Amr S. Abulila and Tamer M. Shehata

Nanomaterials 2020, 10(10), 1954; https://doi.org/10.3390/nano10101954 - 30 Sep 2020

Cited by 43 | Viewed by 4850

Abstract

The purpose of this study was to fabricate biostable inorganic silver nanoparticles (AgNPs) using fresh peel (aqueous) extract of Benincasa hispida. A fast, robust, and eco-friendly approach was used for the synthesis of AgNPs, where bioactive components of peel extract of B. [...] Read more.

The purpose of this study was to fabricate biostable inorganic silver nanoparticles (AgNPs) using fresh peel (aqueous) extract of Benincasa hispida. A fast, robust, and eco-friendly approach was used for the synthesis of AgNPs, where bioactive components of peel extract of B. hispida acted as reducing and stabilizing agents. Synthesized AgNPs were characterized using a UV–Vis spectrophotometer, Fourier-transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), and electron microscopy. The synthesized nanoparticles exhibited maximum absorption at 418 nm under the typical AgNPs surface plasmon resonance band range. They depicted a mean size of 26 ± 2 nm with a spherical shape. Their therapeutic prospective was determined by evaluating their antimicrobial and anticancer potential. The bio-synthesized silver nanoparticles exhibited strong antimicrobial activity with minimum inhibitory concentration (MIC 50) values of 14.5, 8.6, 6.063, and 13.4 μg/mL against Staphylococcus aureus (ATCC 25923), Micrococcus luteus (ATCC 14593), Escherichia coli (ATCC 25922), and Klebsiella pneumonia (ATCC 13883), respectively. The biosynthesized AgNPs showed potent in vitro cytotoxicity against human cervical cancer cell line with a half maximal inhibitory concentration (IC₅₀) value of 0.066 μg/mL; however, no cytotoxic effect was observed on normal human primary osteoblasts cell line. This study explored B. hispida extract and confirmed its effectiveness as a promising source in producing AgNPs that could be employed for several therapeutic applications. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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15 pages, 2201 KiB

Open AccessArticle

Cerium Oxide Nanoparticles and Their Efficient Antibacterial Application In Vitro against Gram-Positive and Gram-Negative Pathogens

by Oana L. Pop, Amalia Mesaros, Dan C. Vodnar, Ramona Suharoschi, Flaviu Tăbăran, Lidia Magerușan, István Sz. Tódor, Zoriţa Diaconeasa, Adriana Balint, Lelia Ciontea and Carmen Socaciu

Nanomaterials 2020, 10(8), 1614; https://doi.org/10.3390/nano10081614 - 18 Aug 2020

Cited by 100 | Viewed by 5977

Abstract

In this study, the antibacterial activity of cerium oxide nanoparticles on two Gram-negative and three Gram-positive foodborne pathogens was investigated. CeO₂ nanoparticles (CeO₂ nps) were synthesized by a Wet Chemical Synthesis route, using the precipitation method and the Simultaneous Addition of [...] Read more.

In this study, the antibacterial activity of cerium oxide nanoparticles on two Gram-negative and three Gram-positive foodborne pathogens was investigated. CeO₂ nanoparticles (CeO₂ nps) were synthesized by a Wet Chemical Synthesis route, using the precipitation method and the Simultaneous Addition of reactants (WCS–SimAdd). The as-obtained precursor powders were investigated by thermal analysis (TG–DTA), to study their decomposition process and to understand the CeO₂ nps formation. The composition, structure, and morphology of the thermally treated sample were investigated by FTIR, Raman spectroscopy, X-ray diffraction, TEM, and DLS. The cubic structure and average particle size ranging between 5 and 15 nm were evidenced. Optical absorption measurements (UV–Vis) reveal that the band gap of CeO₂ is 2.61 eV, which is smaller than the band gap of bulk ceria. The antioxidant effect of CeO₂ nps was determined, and the antibacterial test was carried out both in liquid and on solid growth media against five pathogenic microorganisms, namely Escherichia coli, Salmonella typhimurium, Listeria monocytogenes, Staphylococcus aureus, and Bacillus cereus. Cerium oxide nanoparticles showed growth inhibition toward all five pathogens tested with notable results. This paper highlights the perspectives for the synthesis of CeO₂ nps with controlled structural and morphological characteristics and enhanced antibacterial properties, using a versatile and low-cost chemical solution method. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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12 pages, 2777 KiB

Open AccessArticle

The Antibacterial Effect of Silver Nanoparticles on Staphylococcus Epidermidis Strains with Different Biofilm-Forming Ability

by Denis Swolana, Małgorzata Kępa, Danuta Idzik, Arkadiusz Dziedzic, Agata Kabała-Dzik, Tomasz J. Wąsik and Robert D. Wojtyczka

Nanomaterials 2020, 10(5), 1010; https://doi.org/10.3390/nano10051010 - 25 May 2020

Cited by 23 | Viewed by 4081

Abstract

Among many infectious diseases, infections caused by pathogens of Staphylococcus species exert a substantial influence upon human health, mainly due to their continuous presence on human skin and mucous membranes. For that reason, an intensive search for new, effective anistaphyloccocal agents can currently [...] Read more.

Among many infectious diseases, infections caused by pathogens of Staphylococcus species exert a substantial influence upon human health, mainly due to their continuous presence on human skin and mucous membranes. For that reason, an intensive search for new, effective anistaphyloccocal agents can currently be observed worldwide. In recent years, there has been growing interest in nanoparticles, as compounds with potential antibacterial effect. The antibacterial activity of silver containing substances has been well recognized, but thoughtful studies focused on the effect of silver nanoparticles on bacterial biofilm are scarce. The aim of this study was to assess the influence of silver nanoparticles (AgNPs) with particle sizes in the range between 10 and 100 nm, and a concentration range from 1 to 10 µg/mL, upon Staphylococcus epidermidis strains with different biofilm-forming abilities (BFAs). The studies revealed the highest level of antimicrobial activity for AgNPs in relation to S. epidermidis strains with BFA, and what is more, the observed effect was proportional to the increasing particles’ size, and strains not forming biofilm were more susceptible to silver nanoparticles with the smallest examined size, which was 10 nm. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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18 pages, 3848 KiB

Open AccessArticle

A Novel Biocompatible Titanium–Gadolinium Quantum Dot as a Bacterial Detecting Agent with High Antibacterial Activity

by Vishma Pratap Sur, Aninda Mazumdar, Amirmansoor Ashrafi, Atripan Mukherjee, Vedran Milosavljevic, Hana Michalkova, Pavel Kopel, Lukáš Richtera and Amitava Moulick

Nanomaterials 2020, 10(4), 778; https://doi.org/10.3390/nano10040778 - 17 Apr 2020

Cited by 10 | Viewed by 4210

Abstract

In this study, the titanium–gadolinium quantum dots (TGQDs) were novel, first of its type to be synthesized, and fully characterized to date. Multiple physical characterization includes scanning electron microscopy (SEM), scanning electrochemical microscope (SCEM), x-ray fluorescence, spectrophotometry, and dynamic light scattering were carried [...] Read more.

In this study, the titanium–gadolinium quantum dots (TGQDs) were novel, first of its type to be synthesized, and fully characterized to date. Multiple physical characterization includes scanning electron microscopy (SEM), scanning electrochemical microscope (SCEM), x-ray fluorescence, spectrophotometry, and dynamic light scattering were carried out. The obtained results confirmed appropriate size and shape distributions in addition to processing optical features with high quantum yield. The synthesized TGQD was used as a fluorescent dye for bacterial detection and imaging by fluorescent microscopy and spectrophotometry, where TGQD stained only bacterial cells, but not human cells. The significant antibacterial activities of the TGQDs were found against a highly pathogenic bacterium (Staphylococcus aureus) and its antibiotic resistant strains (vancomycin and methicillin resistant Staphylococcus aureus) using growth curve analysis and determination of minimum inhibitory concentration (MIC) analysis. Live/dead cell imaging assay using phase-contrast microscope was performed for further confirmation of the antibacterial activity. Cell wall disruption and release of cell content was observed to be the prime mode of action with the reduction of cellular oxygen demand (OD). Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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13 pages, 2589 KiB

Open AccessArticle

Green Silver Nanoparticles Formed by Phyllanthus urinaria, Pouzolzia zeylanica, and Scoparia dulcis Leaf Extracts and the Antifungal Activity

by Dai Hai Nguyen, Jung Seok Lee, Ki Dong Park, Yern Chee Ching, Xuan Thi Nguyen, V.H. Giang Phan and Thai Thanh Hoang Thi

Nanomaterials 2020, 10(3), 542; https://doi.org/10.3390/nano10030542 - 17 Mar 2020

Cited by 71 | Viewed by 5827 | Correction

Abstract

Phytoconstituents presenting in herbal plant broths are the biocompatible, regenerative, and cost-effective sources that can be utilized for green synthesis of silver nanoparticles. Different plant extracts can form nanoparticles with specific sizes, shapes, and properties. In the study, we prepared silver nanoparticles (P.uri.AgNPs, [...] Read more.

Phytoconstituents presenting in herbal plant broths are the biocompatible, regenerative, and cost-effective sources that can be utilized for green synthesis of silver nanoparticles. Different plant extracts can form nanoparticles with specific sizes, shapes, and properties. In the study, we prepared silver nanoparticles (P.uri.AgNPs, P.zey.AgNPs, and S.dul.AgNPs) based on three kinds of leaf extracts (Phyllanthus urinaria, Pouzolzia zeylanica, and Scoparia dulcis, respectively) and demonstrated the antifungal capacity. The silver nanoparticles were simply formed by adding silver nitrate to leaf extracts without using any reducing agents or stabilizers. Formation and physicochemical properties of these silver nanoparticles were characterized by UV-vis, Fourier transforms infrared spectroscopy, scanning electron microscope, transmission electron microscope, and energy dispersive X-ray spectroscopy. P.uri.AgNPs were 28.3 nm and spherical. P.zey.AgNPs were 26.7 nm with hexagon or triangle morphologies. Spherical S.dul.AgNPs were formed and they were relatively smaller than others. P.uri.AgNPs, P.zey.AgNPs and S.dul.AgNPs exhibited the antifungal ability effective against Aspergillus niger, Aspergillus flavus, and Fusarium oxysporum, demonstrating their potentials as fungicides in the biomedical and agricultural applications. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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19 pages, 4607 KiB

Open AccessArticle

Peptide-Carbon Quantum Dots conjugate, Derived from Human Retinoic Acid Receptor Responder Protein 2, against Antibiotic-Resistant Gram Positive and Gram Negative Pathogenic Bacteria

by Aninda Mazumdar, Yazan Haddad, Vedran Milosavljevic, Hana Michalkova, Roman Guran, Sukanya Bhowmick and Amitava Moulick

Nanomaterials 2020, 10(2), 325; https://doi.org/10.3390/nano10020325 - 14 Feb 2020

Cited by 38 | Viewed by 5453

Abstract

Antibiotic-resistant bacterial infections have become global issues for public health, which increases the utter need to develop alternatives to antibiotics. Here, the HSER (Homo sapiens retinoic acid receptor) peptide was designed from retinoic acid receptor responder protein 2 of Homo sapiens, and [...] Read more.

Antibiotic-resistant bacterial infections have become global issues for public health, which increases the utter need to develop alternatives to antibiotics. Here, the HSER (Homo sapiens retinoic acid receptor) peptide was designed from retinoic acid receptor responder protein 2 of Homo sapiens, and was conjugated with synthesized CQDs (carbon quantum dots) for enhanced antibacterial activity in combination, as individually they are not highly effective. The HSER–CQDs were characterized using spectrophotometer, HPLC coupled with electrospray-ionization quadrupole time-of-flight mass spectrometer (ESI–qTOF) mass spectrometer, zeta potential, zeta size, and FTIR. Thereafter, the antibacterial activity against Vancomycin-Resistant Staphylococcus aureus (VRSA) and Escherichia coli (carbapenem resistant) was studied using growth curve analysis, further supported by microscopic images showing the presence of cell debris and dead bacterial cells. The antibacterial mechanism of HSER–CQDs was observed to be via cell wall disruption and also interaction with gDNA (genomic DNA). Finally, toxicity test against normal human epithelial cells showed no toxicity, confirmed by microscopic analysis. Thus, the HSER–CQDs conjugate, having high stability and low toxicity with prominent antibacterial activity, can be used as a potential antibacterial agent. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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14 pages, 3192 KiB

Open AccessArticle

Synthesis and Antibacterial Properties of Novel ZnMn₂O₄–Chitosan Nanocomposites

by Rajiv Gandhi Packirisamy, Chandramohan Govindasamy, Anandhavelu Sanmugam, K. Karuppasamy, Hyun-Seok Kim and Dhanasekaran Vikraman

Nanomaterials 2019, 9(11), 1589; https://doi.org/10.3390/nano9111589 - 9 Nov 2019

Cited by 32 | Viewed by 3917

Abstract

The development of productive antibacterial agents from nontoxic materials via a simple methodology has been an immense research contribution in the medicinal chemistry field. Herein, a sol–gel one-pot reaction was used to synthesize hybrid composites of hausmannite–chitosan (Mn₃O₄–CS) and [...] Read more.

The development of productive antibacterial agents from nontoxic materials via a simple methodology has been an immense research contribution in the medicinal chemistry field. Herein, a sol–gel one-pot reaction was used to synthesize hybrid composites of hausmannite–chitosan (Mn₃O₄–CS) and its innovative derivative zinc manganese oxide–chitosan (ZnMn₂O₄–CS). Fixed amounts of CS with different metal matrix w/v ratios of 0.5%, 1.0%, 1.5%, and 2.0% for Mn and Zn precursors were used to synthesize ZnMn₂O₄–CS hybrid composites. X-ray diffraction analysis indicated the formation of polycrystalline tetragonal-structured ZnMn₂O₄ with a CS matrix in the hybrids. Fourier-transform infrared spectroscopic analysis confirmed the formation of ZnMn₂O₄–CS hybrids. Detailed investigations of the surface modifications were conducted using scanning electron microscopy; micrographs at different magnifications revealed that the composites’ surface changed depending on the ratio of the source materials used to synthesize the ZnMn₂O₄–CS hybrids. The antibacterial activity of the Mn₃O₄–CS and ZnMn₂O₄–CS composites was tested against various bacterial species, including Bacillus subtilis, Escherichia coli, Salmonella typhi, and Pseudomonas aeruginosa. The zone of inhibition and minimum inhibitory concentration values were deduced to demonstrate the efficacy of the ZnMn₂O₄–CS nanocomposites as antibacterial agents. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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15 pages, 2312 KiB

Open AccessArticle

CdSe QD Biosynthesis in Yeast Using Tryptone-Enriched Media and Their Conjugation with a Peptide Hecate for Bacterial Detection and Killing

by Vishma Pratap Sur, Marketa Kominkova, Zaneta Buchtova, Kristyna Dolezelikova, Ondrej Zitka and Amitava Moulick

Nanomaterials 2019, 9(10), 1463; https://doi.org/10.3390/nano9101463 - 16 Oct 2019

Cited by 30 | Viewed by 3887

Abstract

The physical and chemical synthesis methods of quantum dots (QDs) are generally unfavorable for biological applications. To overcome this limitation, the development of a novel “green” route to produce highly-fluorescent CdSe QDs constitutes a promising substitute approach. In the present work, CdSe QDs [...] Read more.

The physical and chemical synthesis methods of quantum dots (QDs) are generally unfavorable for biological applications. To overcome this limitation, the development of a novel “green” route to produce highly-fluorescent CdSe QDs constitutes a promising substitute approach. In the present work, CdSe QDs were biosynthesized in yeast Saccharomyces cerevisiae using a novel method, where we showed for the first time that the concentration of tryptone highly affects the synthesis process. The optimum concentration of tryptone was found to be 25 g/L for the highest yield. Different methods were used to optimize the QD extraction from yeast, and the best method was found to be by denaturation at 80 °C along with an ultrasound needle. Multiple physical characterizations including transmission electron microscopy (TEM), dynamic light scattering (DLS), energy-dispersive X-ray spectroscopy (EDX), and spectrophotometry confirmed the optical features size and shape distribution of the QDs. We showed that the novel conjugate of the CdSe QDs and a cell-penetrating peptide (hecate) can detect bacterial cells very efficiently under a fluorescent microscope. The conjugate also showed strong antibacterial activity against vancomycin-resistant Staphylococcus aureus (VRSA), methicillin-resistant Staphylococcus aureus (MRSA), and Escherichia coli, which may help us to cope with the problem of rising antibiotic resistance. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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10 pages, 2716 KiB

Open AccessArticle

Bacterial Compatibility/Toxicity of Biogenic Silica (b-SiO₂) Nanoparticles Synthesized from Biomass Rice Husk Ash

by Sanjeev K. Sharma, Ashish R. Sharma, Sudheer D. V. N. Pamidimarri, Jyotshana Gaur, Beer Pal Singh, Sankar Sekar, Deuk Young Kim and Sang Soo Lee

Nanomaterials 2019, 9(10), 1440; https://doi.org/10.3390/nano9101440 - 11 Oct 2019

Cited by 29 | Viewed by 4012

Abstract

Biogenic silica (b-SiO₂) nanopowders from rice husk ash (RHA) were prepared by chemical method and their bacterial compatibility/toxicity was analyzed. The X-ray diffractometry (XRD) patterns of the b-SiO₂ nanopowders indicated an amorphous feature due to the absence of any sharp [...] Read more.

Biogenic silica (b-SiO₂) nanopowders from rice husk ash (RHA) were prepared by chemical method and their bacterial compatibility/toxicity was analyzed. The X-ray diffractometry (XRD) patterns of the b-SiO₂ nanopowders indicated an amorphous feature due to the absence of any sharp peaks. Micrographs of the b-SiO₂ revealed that sticky RHA synthesized SiO₂ nanopowder (S1) had clustered spherical nanoparticles (70 nm diameter), while b-SiO₂ nanopowder synthesized from red RHA (S2) and b-SiO₂ nanopowder synthesized from brown RHA (S3) were purely spherical (20 nm and 10 nm diameter, respectively). Compared to the S1 (11.36 m²g⁻¹) and S2 (234.93 m²g⁻¹) nanopowders, the S3 nanopowders showed the highest surface area (280.16 m²g⁻¹) due to the small particle size and high porosity. The core level of the X-ray photoelectron spectroscopy (XPS) spectra showed that Si was constituted by two components, Si 2p (102.2 eV) and Si 2s (153.8 eV), while Oxygen 1s was observed at 531.8 eV, confirming the formation of SiO₂. The anti-bacterial activity of the b-SiO₂ nanopowders was investigated using both gram-positive (Escherichia coli) and gram-negative (Staphylococcus aureus) microorganisms. Compared to S2 and S3 silica nanopowders, S1 demonstrated enhanced antibacterial activity. This study signifies the medical, biomedical, clinical, and biological importance and application of RHA-mediated synthesized b-SiO₂. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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Review

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35 pages, 1987 KiB

Open AccessReview

Antimicrobial Activity of Zinc Oxide Nano/Microparticles and Their Combinations against Pathogenic Microorganisms for Biomedical Applications: From Physicochemical Characteristics to Pharmacological Aspects

by Su-Eon Jin and Hyo-Eon Jin

Nanomaterials 2021, 11(2), 263; https://doi.org/10.3390/nano11020263 - 20 Jan 2021

Cited by 118 | Viewed by 8405

Abstract

Zinc oxide (ZnO) nano/microparticles (NPs/MPs) have been studied as antibiotics to enhance antimicrobial activity against pathogenic bacteria and viruses with or without antibiotic resistance. They have unique physicochemical characteristics that can affect biological and toxicological responses in microorganisms. Metal ion release, particle adsorption, [...] Read more.

Zinc oxide (ZnO) nano/microparticles (NPs/MPs) have been studied as antibiotics to enhance antimicrobial activity against pathogenic bacteria and viruses with or without antibiotic resistance. They have unique physicochemical characteristics that can affect biological and toxicological responses in microorganisms. Metal ion release, particle adsorption, and reactive oxygen species generation are the main mechanisms underlying their antimicrobial action. In this review, we describe the physicochemical characteristics of ZnO NPs/MPs related to biological and toxicological effects and discuss the recent findings of the antimicrobial activity of ZnO NPs/MPs and their combinations with other materials against pathogenic microorganisms. Current biomedical applications of ZnO NPs/MPs and combinations with other materials are also presented. This review will provide the better understanding of ZnO NPs/MPs as antibiotic alternatives and aid in further development of antibiotic agents for industrial and clinical applications. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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20 pages, 2278 KiB

Open AccessReview

The Potential of Silver Nanoparticles for Antiviral and Antibacterial Applications: A Mechanism of Action

by Atiqah Salleh, Ruth Naomi, Nike Dewi Utami, Abdul Wahab Mohammad, Ebrahim Mahmoudi, Norlaila Mustafa and Mh Busra Fauzi

Nanomaterials 2020, 10(8), 1566; https://doi.org/10.3390/nano10081566 - 9 Aug 2020

Cited by 384 | Viewed by 22879

Abstract

Rapid development of nanotechnology has been in high demand, especially for silver nanoparticles (AgNPs) since they have been proven to be useful in various fields such as medicine, textiles, and household appliances. AgNPs are very important because of their unique physicochemical and antimicrobial [...] Read more.

Rapid development of nanotechnology has been in high demand, especially for silver nanoparticles (AgNPs) since they have been proven to be useful in various fields such as medicine, textiles, and household appliances. AgNPs are very important because of their unique physicochemical and antimicrobial properties, with a myriad of activities that are applicable in various fields, including wound care management. This review aimed to elucidate the underlying mechanisms of AgNPs that are responsible for their antiviral properties and their antibacterial activity towards the microorganisms. AgNPs can be synthesized through three different methods—physical, chemical, and biological synthesis—as indicated in this review. The applications and limitations of the AgNPs such as their cytotoxicity towards humans and the environment, will be discussed. Based on the literature search obtained, the properties of AgNPs scrutinizing the antibacterial or antiviral effect shown different interaction towards bacteria which dependent on the synthesis processes followed by the morphological structure of AgNPs. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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22 pages, 1134 KiB

Open AccessReview

Limitations of Recent Studies Dealing with the Antibacterial Properties of Silver Nanoparticles: Fact and Opinion

by Raphaël E. Duval, Jimmy Gouyau and Emmanuel Lamouroux

Nanomaterials 2019, 9(12), 1775; https://doi.org/10.3390/nano9121775 - 13 Dec 2019

Cited by 51 | Viewed by 5619

Abstract

Due to the constant increase in the number of infectious diseases and the concomitant lack of treatment available, metallic nanoparticles (e.g., silver nanoparticles) have been of particular interest in the last decades. Indeed, several studies suggest that silver nanoparticles have valuable antimicrobial activities, [...] Read more.

Due to the constant increase in the number of infectious diseases and the concomitant lack of treatment available, metallic nanoparticles (e.g., silver nanoparticles) have been of particular interest in the last decades. Indeed, several studies suggest that silver nanoparticles have valuable antimicrobial activities, especially against bacteria, which may lead us to think that these nanoparticles may one day be an attractive therapeutic option for the treatment of bacterial infections. Unfortunately, when we look a little closer to these studies, we can see a very great heterogeneity (e.g., in the study design, in the synthetic process of nanoparticles, in the methods that explore the antibacterial properties of nanoparticles and in the bacteria chosen) making cross-interpretation between these studies impossible, and significantly limiting the interest of silver nanoparticles as promising antibacterial agents. We have selected forty-nine international publications published since 2015, and propose to discuss, not the results obtained, but precisely the different methodologies developed in these publications. Through this discussion, we highlighted the aspects to improve, or at least to homogenize, in order to definitively establish the interest of silver nanoparticles as valuable antibacterial agents. Full article

(This article belongs to the Special Issue Antibacterial Activity of Nanoparticles)

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2 pages, 525 KiB

Open AccessCorrection

Correction: Nguyen et al. Green Silver Nanoparticles Formed by Phyllanthus urinaria, Pouzolzia zeylanica, and Scoparia dulcis Leaf Extracts and the Antifungal Activity. Nanomaterials 2020, 10, 542

by Dai Hai Nguyen, Jung Seok Lee, Ki Dong Park, Yern Chee Ching, Xuan Thi Nguyen, V.H. Giang Phan and Thai Thanh Hoang Thi

Nanomaterials 2024, 14(5), 475; https://doi.org/10.3390/nano14050475 - 6 Mar 2024

Cited by 1 | Viewed by 996

Abstract

In the original publication [...] Full article

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