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

Abstract

The bark extract of Mimusops elengi is rich in different types of plant secondary metabolites such as flavonoids, tannins, triterpenoids and saponins. The present study shows the usefulness of the bark extract of Mimusops elengi for the green synthesis of gold nanoparticles in water at room temperature under very mild conditions. The synthesis of the gold nanoparticles was complete within a few minutes without any extra stabilizing or capping agents and the polyphenols present in the bark extract acted as both reducing as well as stabilizing agents. The synthesized colloidal 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 3-nitrophenol and 4-nitrophenol to their corresponding aminophenols in water at room temperature.

Green biosynthesis of gold nanoparticles using Chenopodium formosanum shell extract and analysis of the particles' antibacterial properties

“…The reason was probably due to the secondary Au reduction on the surface of preformed nuclei and additional interaction among surface capping molecules . This phenomenon was consistent with previous results for the synthesis of Au NPs using Mimusops elengi bark, Fagonia indica , and Sargentodoxa cuneata aqueous extract.…”

“…Various plants, including Annona squamosal , Swertia chirata , Momordica cochinchinensis , Gnidia glauca , Medicago sativa , Mussaenda glabrata , Acer pentapomicum , Mimusops elengi , and Hibiscus sabdariffa , have been proposed for Au NP synthesis. For plants containing betanin, the reducing power of Djulis ( Chenopodium formosanum ) with 69.93 µmol Fe 2+ /g for ferric reducing antioxidant power (FRAP) was higher than red‐fleshed Hylocereus polyrhizus (32.50 µmol Fe 2+ /g) for synthesis of NPs .…”

“…7 Green methods for synthesizing Au NPs involving the use of bacteria, yeast, fungi, and plant extracts have been investigated. 2 Among these methods, plant extract synthesis is relatively economical, sustainable, and easy to scale up, and thus serves as a simple and fast alternative to conventional chemical and physical 3694 www.soci.org M-N Chen et al 4 Gnidia glauca, 5 Medicago sativa, 6 Mussaenda glabrata, 8 Acer pentapomicum, 9 Mimusops elengi, 10 and Hibiscus sabdariffa, 11 have been proposed for Au NP synthesis. For plants containing betanin, the reducing power of Djulis (Chenopodium formosanum) with 69.93 μmol Fe 2+ /g for ferric reducing antioxidant power (FRAP) 12 was higher than red-fleshed Hylocereus polyrhizus (32.50 μmol Fe 2+ /g) for synthesis of NPs.…”

Catalytic and biological activities of green silver nanoparticles synthesized from Plumeria alba (frangipani) flower extract

“…The EB dye degradation assay was also performed in a similar way following the above procedure of MB. On the other hand reduction of 4-NP was carried out following the previously reported method [25]. In this analysis, 0.2 ml of FSNPs (50 μg/ml) was added to 0.2 ml of 4-NP (10 − 5 M) and 2.5 ml of freshly prepared NaBH 4 (0.150 M) and the absorbance of reaction mixture was measured by using a UV-visible spectrophotometer at different time intervals.…”

Mussel inspired green synthesis of silver nanoparticles-decorated halloysite nanotube using dopamine: characterization and evaluation of its catalytic activity

“…Such type of reaction catalyzed by novel metal particles has been comprehensively reported as this reaction can be easily monitored by UV-visible spectroscopy Hervés et al 2012;Hu et al 2015;Krishna et al 2016;Majumdar et al 2016). Figure S1 shows representative time-dependent UV-visible absorption spectra of reduction of 4-NP in the presence of NaBH 4 .…”