Afzelia quanzensis bark extract for green synthesis of silver nanoparticles and study of their antibacterial activity

Abstract

In the present study, Afzelia quanzensis bark extract was tested for the biosynthesis of silver nanoparticles (AgNPs). Based on UV-Vis spectrum analysis, the characteristic absorption band was observed at 427 nm. Furthermore, the size and shape of the nanoparticles ranged from 10 to 80 nm and were spherical in shape as observed through SEM analysis. In addition, the X-ray diffraction analysis showed that the silver nanoparticles are crystalline in nature and have a face-centred cubic structure. Based on FTIR analysis, the presence of phytochemical functional groups such as carboxyl (-C=O) and amine (N-H) in Afzelia quanzensis bark extract further confirmed the responsible reducing agents for nanoparticles formation. Interestingly, the synthesized silver nanoparticles at 50 mg/ L concentration showed significant antibacterial activity against Escherichia coli and Staphylococcus aureus.

Medicinal plants used by ‘root doctors’, local traditional healers in Bié province, Angola

“…Angola: vermifuge, alimentary complement (Urso et al, 2016), headache, yellow fever, respiratory diseases, epilepsy (Göhre et al, 2016); Cameroon: insect bite, skin disorders (Youmsi et al, 2017); Congo: blindness, headache, cough, fever, stomachache, hemorrhoids, stomachache (Makumberlo et al, 2008), Guinea-Bissau: stomachache (Frazão-Moreira, 2016), human nutrition, malaria, cough, contraindicated with pregnant women, milk stimulation for nursing women, fever and malaria, stomachache, fortify infants, dermatosis, yellow fever, hemorrhoids, anemia in children, sexual weakness, painful menstruation, against itching or insect bite, hipache, nausea in pregnant women, women infertility, absence of menstruation, strengthening bones, snake bite, stomachache, intestinal worms, tuberculosis, tooth decay, fever, wound healing, swelling and edema, miscarriage, vertigo, bad body smell, magico-religious (Kafoutchoni et al, 2018) Cytotoxicity, anticancer (Kuete et al, 2014), antibacterial (Djeussi et al, 2013 Afzelia quanzensis Anemia (Peter et al, 2014), bilharziasis, eye complaints, for general luck (Hutchings et al, 1996), aphrodisiac, eczema, restricted internal use (Orwa et al, 2009), gonorrhea, chest pains, kidney problems, bilharziasis, eye problems and snake bite (Hines and Eckman, 1993) Antibacterial (Moyo et al, 2015) Albizia adianthifolia Diabetes, eye problems, gastrointestinal problems, haemorrhoids, headache, neurodegenerative disorders, purgative, reproductive problems in women, respiratory problems (bronchitis), wounds and pain, skin disorders, sexually transmitted infections, lower respiratory infections, diarrheal diseases, ischaemic heart disease, cough, sinusitis, dysentery, stomachache, hypertension (Maroyi et al, 2018), enema (Cunningham, 1993 Acetylcholinesterase inhibitory, anthelmintic, antiamoebic, antibacterial, antimycobacterial, anti-sexually transmitted infections, antifungal, antiinflammatory, antioxidant, anxiolytic and antidepressant, cognitiveenhancing, haemolytic, hypoglycemic and antihyperglycemic, immunomodulatory cytotoxicity (Maroyi et al, 2018); antibacterial, antiinflammatory and anticholinesterase effects (Eldeen et al, 2005) Albizia antunesiana Mozambique: toothache (Bruschi et al, 2011); Zimbabwe: purgative, diarrhea, gonorrhea, aphrodisiac, women infertility, convulsions, blenhorragie (Maroyi, 2011) Non-cytotoxic in vitro (Chipiti et al, 2015), antioxidative (Chipiti et al, 2013) Aloe zebrina Angola: wounds, constipation, inflammation, urinary diseases, snake bite, back…”

Nano-Biotechnology: Developing Nano-silver coated cotton fabrics by means of biosynthesis of silver nanoparticles using Aspergillus terrues strain (MTCC9618) against staphylococcus aureus

“…Surface plasm on resonance (SPR) of the oscillation of free conduction electron was also detected through visible spectrumin the range of 300nm to 700nm absorbance in which there was the distinct peak at around 430nm to 450nm wave length (λ). The resultant was good scientific evidence that at around the peak of 450nm, the formation of small spherical silver nanoparticles were recorded without agglomeration in the aqueous solutions [15]. It also some was absorbance at around 300nm might be related to the presence of active extracellular bioorganic proteins, enzymes.…”

جسيمات الفضة متناهية الصغر من مستخلصات النبات

“…Recently, Silver nanoparticles have been biosynthesized by using leaf extracts of the plant such as Aloe vera leaf extract [144], Ricinus Communis leaves extract [145] leaf extracts of Piper nigrum [146] and Ocimum sanctum leaf extract [147]. Also, AgNPs have been biosynthesized by using root extracts of the plant such as Zingiber officinale root extract [148], And by using bark extracts such as Afzelia quanzensis bark extract [149]. AgNPs were prepared by biological reduction of AgNO 3 as a precursor using Mentha piperita (Lamiaceae) leaf extract in ambient conditions, most probably because of the presence of phytochemicals in the extract, thereby reducing Ag+ into Ag0 [150].…”