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Cotton tree (Bombax ceiba L.) flower stamen extract: Turning a food ingredient into a reducing agent for the green synthesis of silver nanoparticles

Sakoolrud Raunmoon^a, Supakid Sachak^a, Waranya Thong-in^a, Boonyakorn Sonkhayan^a, Pitak Nasomjai^a, Phichaya Khamai^b, Arthid Thim-uam^b, Paideang Khwanchai^c, Chee O. Too^a, Widsanusan Chartarrayawadee^a,*

 
ABSTRACT:     Cotton tree (Bombax ceiba L.) flower stamen has been widely used as a northern Thai food ingredient. In this work, microwave extraction was applied to obtain the Bombax ceiba L. (BOMBAX) flower stamen extract for use as a reducing agent in the green synthesis of silver nanoparticles (AgNPs replica watches). The concentration of BOMBAX used was in the range of 0.05 to 0.25 wt%. Quasi-spherical and semi-rectangular shapes of AgNPs were obtained. The synthesized AgNPs showed a high mean zeta potential value of more than 30 mV, indicating the long-term stability and superior dispersity of AgNPs due to the repulsion of negative charges. Furthermore, the antibacterial potency of the synthesized AgNPs affords a good inhibition zone for both gram-negative and gram-positive bacteria, especially the gram-negative and antibiotic-resistant bacteria Pseudomonas aeruginosa, showing an inhibition zone diameter of 19.4-0.4 mm compared to chlophenicol (13.0-0.0 mm). This result suggests that the synthesized AgNPs present good colloidal stability and show good potential as an antibacterial agent for antibiotic-resistant bacteria, especially P. aeruginosa.

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* Corresponding author, E-mail: widsanusan.ch@up.ac.th

Received 7 Dec 2022, Accepted 28 Nov 2023