Abroma augusta Linn bark extract-mediated green synthesis of gold nanoparticles and its application in catalytic reduction

Abstract

The bark extract of Abroma augusta Linn is rich in medicinally important phytochemicals including antioxidants and polyphenols. First one step green synthesis of gold nanoparticles (AuNPs) has been described utilizing the bark extract of Abroma augusta L. and chloroauric acid under very mild reaction conditions. The phytochemicals present in the bark extract acted both as a reducing as well as a stabilizing agent, and no additional stabilizing and capping agents were needed. Detailed characterizations of the stabilized AuNPs were carried out by surface plasmon resonance spectroscopy, high resolution transmission electron microscopy, and X-ray diffraction studies. The catalytic activity of the freshly synthesized gold nanoparticles has been demonstrated for the sodium borohydride reduction of 4-nitrophenol to 4-aminophenol, and the kinetics of the reduction reaction have been studied spectrophotometrically.

Catalytic activity of Ni complexed aminoclay towards the reduction of Cr(V), p-nitrophenol and fluorescein dye

“…This proved that the present catalyst system is effective towards the catalytic reduction of single or bicomponent systems. In 2015, Das et al (2015) reported the k app value of 7 9 10 -3 s -1 for the catalytic reduction of NiP using plant extract decorated Au nanoparticles. When compared with the literature, the present system yielded somewhat higher k app value.…”

Green synthesis of Nerium oleander-conjugated gold nanoparticles and study of its in vitro anticancer activity on MCF-7 cell lines and catalytic activity

“…Additional advantage of this method is that the extract itself acts as a stabilizer and no additional stabilizers are required. The extracts of Aspergillus fischeri [ 19 ], Epicoccum nigrum [ 20 ], bark of Mimusops elengi [ 21 ], leaf of Chrysophyllum cainito (Star apple) [ 22 ], bark of Abroma augusta Linn, [ 23 ] Backhousia citriodora [ 24 ], Breynia rhamnoides [ 25 ], Piper betle [ 26 ], pear extract [ 27 ] etc. have been utilized for the synthesis of AuNPs.…”

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).…”