Facile green synthesis of variable metallic gold nanoparticle using Padina gymnospora, a brown marine macroalga

Abstract

The process of development of reliable and eco-friendly metallic nanoparticles is an important step in the field of nanotechnology. To achieve this, use of natural sources like biological systems becomes essential. In the present work, extracellular biosynthesis of gold nanoparticles using Padina gymnospora has been attempted and achieved rapid formation of gold nanoparticles in a short duration. The UV-vis spectrum of the aqueous medium containing gold ion showed peak at 527 nm corresponding to the plasmon absorbance of gold nanoparticles. Scanning electron microscopy showed the formation of welldispersed gold nanoparticles. FTIR spectra of brown alga confirmed that hydroxyl groups present in the algal polysaccharides were involved in the gold bioreduction. AFM analysis showed the results of particle sizes (53-67 nm) and average height of the particle roughness (60.0 nm). X-ray diffraction (XRD) spectrum of the gold nanoparticles exhibited Bragg reflections corresponding to gold nanoparticles. This environment-friendly method of biological gold nanoparticle synthesis can be applied potentially in various products that directly come in contact with the human body, such as cosmetics, and foods and consumer goods, besides medical applications.

Structural characterization, antioxidant and in vitro cytotoxic properties of seagrass, Cymodocea serrulata (R.Br.) Asch. & Magnus mediated silver nanoparticles

“…Therefore, the present study was aimed to synthesize AgNPs from C. serrulata. The C. serrulata mediated CS-AgNPs exhibited dark-brown color as reported by early researchers [17,20,21]. The formation of AgNPs by reduction of the aqueous Ag + ions during exposure to the CSAE has been evidenced by color change of the reaction mixture.…”

“…In CS-AgNPs, the SPR occurred as a band near 420 nm. When particles deviate from the spherical geometry, the aggregation of AgNPs in the solution will take place [20]. The XRD analysis of AgNPs showed strong and narrow diffraction peaks indicating the crystalline nature of the products (Fig.…”

Quorum quenching and antibacterial activity of silver nanoparticles synthesized from <i>Sargassum polyphyllum</i>

“…Biological synthesis of silver nanoparticles using bacteria, fungi, algae, enzymes and plant extracts is ecofriendly, time conception and able to synthesis different sizes and shapes of stable nanocolloids (Gnanadesigan et al, 2012). Moreover synthesis of AgNPs using marine brown algae shows more advantageous over other biological processes because it reduce the cell maintaining process, easy to harvest and also extremely suitable for large scale production of silver nanoparticles (Singh et al, 2013). The purpose of the present work was to determine the quorum quenching and antibacterial activity of AgNPs synthesized from marine seaweed Sargassum polyphyllum, thereby throwing light on the potential role of algae in increasing the effectiveness of antibiotics.…”

Gripe water-mediated green synthesis of silver nanoparticles and their applications in nonlinear optics and surface-enhanced Raman spectroscopy

“…The 'green' synthesis protocols are advantageous over the chemical reduction techniques as they are less toxic, eco-friendly and economical. Ag nanoparticles have been synthesized using microorganisms such as algae (Singh et al 2013), bacteria (Mohanpuria et al 2008), and fungi (Honary et al 2013). Various green synthesis procedures for the synthesis of gold and silver nanoparticles have evolved using plant extracts (Vankar and Shukla 2012;Augustine et al 2013;Swamy et al 2014;Majumdar and Bag 2013), fruit (Dauthal and Mukhopadhyay 2013) and flower extracts (Philip 2010).…”