Amaranthus dubius leaf extract ( Muthukumar et al.,2015), used to synthesis iron nanoparticles because it contains various photochemicals like amaranthine, isoamaranthine, phenols, flavonoids, and lysine that are used as reducing agents(Yizhong et al., 2003; Jannathul et al., 2014). 20 gm of leaves were heated with 100 mL distilled water at 50 °C for 45 min then filtered through a Whatmann filter paper and stored at 4 °C for further use. Solution of leaf extract 40 ml adds to 50 ml of 0.5 M FeCl3 solution. The leaf extract pH 6 adjusted using 0.1 N HCl and 0.1 N NaOH was added drop wise to the FeCl3 solution with continuously stirring for 90 minute. Precipitates were washed with absolute ethanol, then dried in an oven at 60 °C for 180 min and stored in sealed bottles under dry condition. The antioxidant activity increased from 34.2 to 94.9 by increase mass of leaves from 5 to 20 g per 100 ml of water. Also an antioxidant activity increases with temperature from 40 to 50 °C, temperature above 50 °C shows that decreased antioxidant activity from 94.9 to 52%. The heating time exceeded 45 min can degrade the antioxidant compound and less than 45 min was not enough for extraction. The zeta-potential value increased from −44 to −66 mV indicate stability of the particles. SEM studies confirmed that FeNps were roughly spherical in shape and size range from 60 to 300 nm. The PSA result showed leaf extract FeNps and sodium borohydride FeNps used as reducing agent size ranges varying from 58 to 530 nm and 105 to 2300 nm, respectively. And have less agglomeration even after 1 month than sodium borohydride FeNps.
Murraya koenigii (curry leaves) used to synthesis Iron Oxide Nanoparticles (Sundaresan et al., 2014). Four grams of powdered leaf obtained by washed Curry leaves with deionized water then dried at room temperature for 24 hours was mixed with 100 mL distilled water and boiling at 100 °C for 5 min.
The Whatman no. 1 filter paper used to filter leaf extract then was stored at 4 °C. 3 mL of extract was added to 7 mL of 1 mM FeSO4 solution and stirred on magnetic stirrer for 5 min. Centrifugate the result at (15,000 rpm, 20 °C) for 20 min, then washed several times with distilled water and dried at a hot air oven. The colour change from transparent yellow to black colour indicate synthesis of Nanoparticles.
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