Acacia nilotica (Babool) leaf extract mediated size-controlled rapid synthesis of gold nanoparticles and study of its catalytic activity

Abstract

The leaf extract of Acacia nilotica (Babool) is rich in different types of plant secondary metabolites such as flavanoids, tannins, triterpenoids, saponines, etc. We have demonstrated the use of the leaf extract for the synthesis of gold nanoparticles in water at room temperature under very mild conditions. The synthesis of the gold nanoparticles was complete in several minutes, and no extra stabilizing or capping agents were necessary. The size of the nanoparticles could be controlled by varying the concentration of the leaf extract. The gold nanoparticles were characterized by HRTEM, surface plasmon resonance spectroscopy, and X-ray diffraction studies. The synthesized gold nanoparticles have been used as an efficient catalyst for the reduction of 4-nitrophenol to 4-aminophenol in water at room temperature.

Rapid Biosynthesis Method and Characterization of Silver Nanoparticles Using <i>Zizyphus spina christi</i> Leaf Extract and Their Antibacterial Efficacy in Therapeutic Application

“…There are many solvents used for extracting the plant components for nanoparticles synthesis like methanol [15] ethanol [16], diethyl ether, chloroform, ethyl acetate [17] and water [18] [19] [20]. As the research is focused on eco-friendly and low cost methods for synthesis of nanoparticles, it is always preferable to use water (aqueous solvent) for extraction procedures and preventing the use of toxic chemicals.…”

Mimusops elengi bark extract mediated green synthesis of gold nanoparticles and study of its catalytic activity

“…Moreover, since the plant extract itself acts as a stabilizer, it makes the method more advantageous over other synthetic methods. The extracts of Acacia nilotica leaf (Majumdar and Bag 2013), Lantana camara leaf (Dash et al 2014a), Abroma augusta Linn bark (Das et al 2014), Breynia rhamnoides (Gangula et al 2011), Saraca indica (Dash et al 2014b), Piper betle (Punuri et al 2012), green coconut shell (Paul et al 2014), etc., have been utilized for the synthesis of AuNPs. During our investigations on the utilization of triterpenoids (C30s) as renewable functional nano-entities Bag and Dash 2011;Bag and Paul 2012;Bag and Majumdar 2014), it occurred to us that the medicinally important bark extract of Mimusops elengi, rich in polyphenolic compounds, can be utilized for the synthesis AuNPs from HAuCl 4 (Baliga et al 2011;Kadam et al 2012).…”

Microwave-irradiated green synthesis of gold nanoparticles for catalytic and anti-bacterial activity

“…Ampicillin (10 μg/ml concentration), an antibiotic served as the standard for measuring the antibacterial activity. The plates were then incubated at 37°C for 24 h and the zones of inhibition were measured (Majumdar et al 2013).…”

“…Several biological systems such as fruit extract, fungi, plants and bacteria can actively reduce metal ions to form metal nanoparticles in environmentally friendly conditions. Recently, green syntheses of gold nanoparticles by using Zizyphus mauritiana extract, palm oil mill effluent, enzymes, garlic extract, gum kondagogu and acacia nilotica are reported (Gan et al 2012;WhiteII et al 2012;Adelere and Lateef 2016;Reddy et al 2015b;Majumdar et al 2013).…”