Green synthesis of titanium dioxide nanoparticles with volatile oil ofEugenia caryophyllatafor enhanced antimicrobial activities

Abstract

Different chemo-physical methods are used to synthesise titanium oxide nanoparticles (TiO NPs), which are often expensive, unfriendly to the environment, toxic, not biocompatible, with a small yield. To resolve these problems, the researchers use green procedures to synthesise TiO-NPs by plant extracts of L. and (onion) and characterise using atomic force microscopy, scanning electron microscopy, transmission electronic microscopy, X-ray diffraction, ultraviolet (UV)-visible (Vis) spectra and Fourier transform infrared spectroscopy. The results indicate that most NPs synthesised by the first and second procedures of onion had an average diameter of 95.7 and 89.1 nm, while NPs synthesised by had an average diameter of 103.60 and 90.07 nm, respectively. In UV-Vis spectra, strong absorption was below 470 nm, and energy gap was 3.3 eV in each of the first procedure of and the second procedure of compared with 270 nm, 6.3 eV for each of the second procedure of and the first procedure of . The antimicrobial activities of NPs were evaluated and an attempt was made to enhance these activities by plant's oil in combination therapies. There were synergistic effects between NPs and plant's oil.

Breast Cancer Inhibition by Biosynthesized Titanium Dioxide Nanoparticles Is Comparable to Free Doxorubicin but Appeared Safer in BALB/c Mice

“…Unfortunately, studies using plant extracts as bioreductants to synthesize TiO 2 NPs are limited. To date, studies reported the synthesis of TiO 2 NPs from a range of (medicinal) plants (mostly aqueous leaf extracts) including Acacia nilotica (gum Arabic tree) [26], Citrus limon (lemon) [39], A. vera [40], Allium cepa (onion) [41], Trigonella foenum-graecum (fenugreek) [42], Curcuma longa (turmeric) [43], Azadirachta indica (neem) [44][45][46], Euphorbia prostrata (spurge spp.) [47], Psidium guajava (guava) [48], Eclipta prostrata (false daisy) [49], Nyctanthes arbor-tristis (night jasmine) [50], Catharanthus roseus (bright eyes) [51], but most of their applications have been focused on infectiology (as antimicrobials).…”

Evaluation of the antibacterial activities of face masks coated with titanium dioxide nanoparticles

“…TiO 2 nanoparticles were chosen because they act as a photocatalyst to kill microorganisms. In addition, TiO2 has a low cost, stability, low toxicity, high ultraviolet absorbance, and a high energy gap (i.e., 3.2–5.2 eV) 3 , 4 .…”

“…Titanium, copper, and silver nanoparticles are examples of metallic nanoparticles. Titanium dioxide (TiO2) has unique properties, such as a low cost, stability, low toxicity, high refractive index, high optical properties, high ultraviolet absorbance, strong redox ability, high energy gap (i.e., 3.2–5.2 eV), and has good electrical, optical and magnetic properties 3 , 4 . It is necessary to fully define the characteristics of nanoparticles, such as their size, shape, surface morphology, crystallinity, and light absorption, using appropriate characterization techniques 5 , such as microscopy techniques (electron microscopy or scanning probe microscopy).…”

Improvement of hydroxyapatite formation ability of titanium‐based alloys by combination of acid etching and apatite nuclei precipitation

“…In addition, titanium oxide has been commercially used especially as a white pigment in paints, colorants, plastics, coatings, cosmetics, and so on [1]. Recently, furthermore, it has been also reported that some kind of titanium oxide showed antimicrobial activity [2]. Thus, Ti‐based materials possess attractive possibilities to advance a wide range of clinical and industrial applications.…”