Safety evaluation of green synthesized Cola nitida pod, seed and seed shell extract-mediated silver nanoparticles (AgNPs) using an Allium cepa assay

Publication date: Available online 27 June 2017 Source:Journal of Taibah University for Science Author(s): Taofeek A. Yekeen, Musibau A. Azeez, Akeem Akinboro, Agbaje Lateef, Tesleem B. Asafa, Iyabo C. Oladipo, Samuel O. Oladokun, Adewumi A. Ajibola The increase in the use of nanoparticles in various fields of human endeavours calls for the need to understand the toxic potential of green synthesized nanoparticles. Cytogenotoxic potentials of green synthesized Cola pod (Cp-AgNPs), seed (Cs-AgNPs) and seed shell (Css-AgNPs) silver nanoparticles and silver nitrate salts (Ags) were evaluated using an A. cepa assay. Twenty onion bulbs were exposed to 0.01, 0.10, 1.0, 10.0, and 100.0μg/ml AgNPs and Ags solutions. Microscopic evaluation was performed at 24, 48 and 72h with 5000 cells per concentration scored for chromosomal aberrations, while the effects on the root growth were evaluated at 72h. The observed dividing cells and mitotic inhibition were dose-dependent for the three AgNPs and Ags at 24, 48 and 72h. Mitotic index obtained for 1.0, 10 and 100μg/mL at all times of evaluation were less than half the value of the negative control, while cell arrest was only observed at 72h at a concentration of 100μg/mL for the three AgNPs. The chromosomal aberrations observed were c-mitosis, a chromosome bridge, a vagrant chromosome, and a sticky chromosome, which indicate the potential of AgNPs for genotoxicity. The mean root length of A. cepa treated with AgNPs showed a dose-...
Source: Journal of Taibah University for Science - Category: Science Source Type: research