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May 12, 2016 Design-Expert is a powerful statistical software that is specifically dedicated to performing Design of Experiments (DoE). It offers a comprehensive statistical tools, provides test matrices for screening, comparative tests, optimization, characterization, mixture designs, robust parameter design, and combined designs.
2053-1591/4/10/105402Abstract
The antibacterial activity of green synthesized calcium oxide nanoparticles was investigated using leaf extract of Mentha piperita in this study. The synthesized nanomaterial was subjected to characterization using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and energy dispersive x-ray spectroscopy (EDX). The SEM images showed agglomeration of disc shaped nanoparticles, and FTIR and EDX spectroscopy indicated intensive peaks for calcium ions and oxygen. Subsequently, the potential of nanoscale CaO was also evaluated for antimicrobial index against E. coli using the well diffusion method. A maximum zone of inhibition up to 42 mm was observed when 100 µg ml−1 material was loaded with inoculum size 50 µl of E. coli in sunlight exposure of 5 h. The experimental conditions were optimized using a central composite design using a response surface methodology. The maximum antimicrobial index of the CaO nanoparticle was 6 mm as a result of the optimized response. Furthermore, the minimum inhibitory concentration of the CaO nanoparticle showed 25 µg ml−1, an effective initial concentration for E.coli removal. The results revealed that the CaO nanocomposite synthesized via a green route was a promising candidate for the removal of E. coli present in drinking water, which is an important fecal indicator.
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