Green synthesis of capped gold nanoparticles and their effect on Gram-positive and Gram-negative bacteria.

ABSTRACT:

Aim

We report synthesis of capped gold nanoparticles (C-AuNPs) of ≈20-30 nm by reducing HAuCl₄ with flower and leaf extracts of Ocimum tenuiflorum, leaves of Azadirachta indica and Mentha spicata and peel of Citrus sinensis plants.

Methods

Atomic force microscopy (AFM) and transmission electron microscopy (TEM) determined their size, shape and topographical structures. The C-AuNPs with UV-Vis spectrophotometer produced a maximum absorption within 530-535 nm wavelengths. Their Fourier transform IR stretching frequencies, from 450 to 4000 cm^-1, have inferred HAuCl₄ reduction to Au.

Results

The 512 and 600 μgml^-1 C-AuNP MICs were expressed on antimicrobial strains Staphylococcus aureus, Pseudomona

SUBMITTER: Rao Y 

PROVIDER: S-EPMC5674245 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature