Hydrothermal syntheses and characterization of bio-modified TiO2 nanoparticles with Aqua Rosa and Protein powder for their biological applications

Maheswari, Palanisamy Uma; Ponnusamy, S.; Harish, S.; Muthamizhchelvan, C.; Munuswamy-Ramanujam, Ganesh; Hayakawa, Y.

doi:10.1016/j.apsusc.2019.07.123

Cited by 6 publications

(2 citation statements)

References 64 publications

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“…Ultraviolet–visible (UV–vis) absorption spectra exhibited that there was a peak at 294 nm for S-NSs (Figure d), and a 9 nm blue shift was observed for d -His-S-NSs and l -His-S-NSs, which may be attributed to the quantum size effects or surface effects of nanosheets. − The inset in Figure d depicts the light blue color of S-NSs. Raman spectra showed that the peaks of S-NSs had a slight red shift compared to those of bulk S, indicating the ultrathin structure of S-NSs (Figure e). , Furthermore, the characteristic Raman peaks of d -/ l -His are shown in Figure S6, confirming that d -/ l -His is successfully modified on the surface of S-NSs.…”

Section: Resultsmentioning

confidence: 99%

Chiral Sulfur Nanosheets for Dual-Selective Inhibition of Gram-Positive Bacteria

Huang

Zhang

et al. 2023

ACS Nano

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Elemental sulfur is the oldest known antimicrobial agent. However, conventional sulfur in the clinic suffers from poor aqueous solubility and limited antibacterial activity, greatly hindering its practical use. Herein, we report a reform strategy coupling dimension engineering with chirality transfer to convert conventional 3D sulfur particles into chiral 2D sulfur nanosheets (S-NSs), which exhibit 50-fold improvement of antibacterial capability and dualselective inhibition against Gram-positive bacteria. Benefiting from the inherent selectivity of S-NSs and chirality selectivity from decorated Dhistidine, the obtained chiral S-NSs are proven to precisely kill Gram-positive drug-resistant bacteria, while no obvious bacterial inhibition is observed for Gram-negative bacteria. Mechanism studies reveal that S-NSs produce numerous reactive oxygen specipoes and hydrogen sulfide after incubation with bacteria, thus causing bacterial membrane destruction, respiratory chain damage, and ATP production inhibition. Upon spraying chiral S-NSs dispersions onto MRSA-infected wounds, the skin healing process was greatly accelerated in 8 days due to metabolism inhibition and oxidative damage of bacteria, indicating the excellent treatment efficiency of MRSA-infected wounds. This work converts the traditional well-known sulfur into modern antibacterial agents with a superior Gram-selectivity bactericidal capability.

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Section: Resultsmentioning

confidence: 99%

Chiral Sulfur Nanosheets for Dual-Selective Inhibition of Gram-Positive Bacteria

Huang

Zhang

et al. 2023

ACS Nano

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“…These patterns showed that both forms of TiO 2 NPs were polycrystalline with well-defined peaks indicating a high degree of crystallinity. The XRD pattern exhibited diffraction peaks at 27.26°, 36.14°, 41.16°, 43.79°, 54.23°, 56.30°, 62.92°, and 68.67°, which belongs to the anatase and tetragonal rutile form of TiO 2 NPs [ 42 , 43 ] (Fig. 2 ).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of TiO2 nanoparticles combined with geraniol and their synergistic antibacterial activity

Younis,

Milosavljevic,

Fialova

et al. 2023

BMC Microbiol

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Background The emergence of antibiotic resistance in pathogenic bacteria has become a global threat, encouraging the adoption of efficient and effective alternatives to conventional antibiotics and promoting their use as replacements. Titanium dioxide nanoparticles (TiO2 NPs) have been reported to exhibit antibacterial properties. In this study, we synthesized and characterized TiO2 NPs in anatase and rutile forms with surface modification by geraniol (GER). Results The crystallinity and morphology of modified TiO2 NPs were analyzed by UV/Vis spectrophotometry, X-ray powder diffraction (XRD), and scanning electron microscopy (SEM) with elemental mapping (EDS). The antimicrobial activity of TiO2 NPs with geraniol was assessed against Staphylococcus aureus, methicillin-resistant Staphylococcus aureus (MRSA), and Escherichia coli. The minimum inhibitory concentration (MIC) values of modified NPs ranged from 0.25 to 1.0 mg/ml against all bacterial strains, and the live dead assay and fractional inhibitory concentration (FIC) supported the antibacterial properties of TiO2 NPs with GER. Moreover, TiO2 NPs with GER also showed a significant decrease in the biofilm thickness of MRSA. Conclusions Our results suggest that TiO2 NPs with GER offer a promising alternative to antibiotics, particularly for controlling antibiotic-resistant strains. The surface modification of TiO2 NPs by geraniol resulted in enhanced antibacterial properties against multiple bacterial strains, including antibiotic-resistant MRSA. The potential applications of modified TiO2 NPs in the biomedical and environmental fields warrant further investigation.

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Bio-modified TiO2 nanoparticles with Withania somnifera, Eclipta prostrata and Glycyrrhiza glabra for anticancer and antibacterial applications

Maheswari

Harish

Navaneethan

et al. 2020

Materials Science and Engineering: C

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Hydrothermal syntheses and characterization of bio-modified TiO2 nanoparticles with Aqua Rosa and Protein powder for their biological applications

Cited by 6 publications

References 64 publications

Chiral Sulfur Nanosheets for Dual-Selective Inhibition of Gram-Positive Bacteria

Chiral Sulfur Nanosheets for Dual-Selective Inhibition of Gram-Positive Bacteria

Synthesis and characterization of TiO2 nanoparticles combined with geraniol and their synergistic antibacterial activity

Bio-modified TiO2 nanoparticles with Withania somnifera, Eclipta prostrata and Glycyrrhiza glabra for anticancer and antibacterial applications

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