Walnut leaf extract-based green synthesis of selenium nanoparticles via microwave irradiation and their characteristics assessment

Abstract

<jats:title>Abstract</jats:title><jats:p>Selenium nanoparticles (Se NPs) have predominant characteristics compared to that in their bulk usage due to their high surface-to-volume ratio. The walnut (<jats:italic>Juglans regia</jats:italic> L.) leaf extract containing different bioactive compounds that act as reductant and stabilizing agents has been used for the green synthesis of the Se NPs. Influences of two synthetic variables, namely, the amount of selenium salt solution ranging from 15 to 25 mL and the amount of walnut leaf extract ranging from 1 to 5 mL, on broad emission peak (<jats:italic>λ</jats:italic><jats:sub>max</jats:sub>) and absorbance of colloidal solutions having Se NPs were evaluated via the response surface methodology. Obtained results indicated that using microwave radiation (800 W for 4 min) and 5 mL of walnut leaf extract and 15 mL of selenium salt solution, Se NPs with <jats:italic>λ</jats:italic><jats:sub>max</jats:sub>, absorbance, particle size, polydispersity index, and zeta potential values of 375 nm, 3.65% absorbance unit (a.u.), 208 nm, 0.206, and −24.7 mV were synthesized, which had high bactericidal activity toward <jats:italic>Escherichia coli</jats:italic> and <jats:italic>Staphylococcus aureus</jats:italic>. The transmission electron microscopy analysis also indicated that spherical and monodispersed Se NPs with a mean particle size of 150 nm were formed using the walnut leaf extract.</jats:p>

Green Biosynthesis of Selenium Nanoparticles Using Orange Peel Waste: Characterization, Antibacterial and Antibiofilm Activities against Multidrug-Resistant Bacteria

“…Figure 1 illustrates the UV analysis of OPWsynthesized Se-NPs, which reveals a significant peak at 295 nm. Due to the formation of the Se-NPs' surface-plasmon resonating (SPR) signal that may have been shown as a wide excitation wavelength (λ max) in the range of a wavelength of 270-400 nm, the creation of Se-NPs could be validated using the UV-Vis spectrophotometer [16,[37][38][39]. Se-NPs have a prominent peak in their UV-Vis spectrum of about 295 nm, which is indicated to spherical Se-NPs [16,37,38].…”

“…Due to the formation of the Se-NPs' surface-plasmon resonating (SPR) signal that may have been shown as a wide excitation wavelength (λ max) in the range of a wavelength of 270-400 nm, the creation of Se-NPs could be validated using the UV-Vis spectrophotometer [16,[37][38][39]. Se-NPs have a prominent peak in their UV-Vis spectrum of about 295 nm, which is indicated to spherical Se-NPs [16,37,38]. The resulting green synthesis of Se-NPs is easy, environmentally safe, and cost-effective, and the NPs produced are non-toxic and length of 270-400 nm, the creation of Se-NPs could be validated using the UV-Vis spectrophotometer [16,[37][38][39].…”

“…Se-NPs have a prominent peak in their UV-Vis spectrum of about 295 nm, which is indicated to spherical Se-NPs [16,37,38]. The resulting green synthesis of Se-NPs is easy, environmentally safe, and cost-effective, and the NPs produced are non-toxic and length of 270-400 nm, the creation of Se-NPs could be validated using the UV-Vis spectrophotometer [16,[37][38][39]. Se-NPs have a prominent peak in their UV-Vis spectrum of about 295 nm, which is indicated to spherical Se-NPs [16,37,38].…”

Effectiveness of six different methods in green synthesis of selenium nanoparticles using propolis extract: Screening and characterization

“…Achieved narrow and sharp picks for the most fabricated Se NPs using synthetic methods indicated the high homogeneity and uniformity of the prepared Se NPs. Sheikhlou et al had already provided Se NPs using walnut leaf extract and microwave heating, with PDI of 0.206 [32].…”

“…Numerous researches revealed that high values of zeta potential (>+30 and <−30) for the mixture solution containing made inorganic NPs show their high stability [19,21]. Sheikhlou et al made Se NPs using the walnut leaf extract and microwave heating, with a zeta potential value of −24.7 mV [32]. 4].…”