what is the mechanism and how this mechanism differ according to the kind of plant?
Dear Raghad,
Please have a look at these links.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3431837/
http://www.sciencedirect.com/science/article/pii/S2090123215000314
http://www.sciencedirect.com/science/article/pii/S1687850715000734
Best of luck
Dear Raghad Zein
Plant differs in their content of antioxidant molecules, which act as reducing agents, The phytochemicals in the plant extract act as a reducing agent, so that silver nitrate is reduced into metallic silver, AgNO3 dissociate into Ag⁺ and NO3‾, and will be affected by Temperature and light... Also phenols can react with a free radical to form the phenoxyl radicals. Plant leaf contains high level of polyphenols (Flavonoids). Phenolic compound has hydroxyl and ketonic groups which are able to bind to metals and reduce the metal salt and provide stability against agglomeration. Plant extract give protein and enzyme to the AgNO3 solution in which Ag⁺ ions combine with the enzyme to form enzyme substrate complex. The enzyme released from the plant extract act on the silver ions and there is a release of silver nanoparticle from enzyme. That silver nanoparticle combine with the protein released from the plant extract and there is a formation of protein capped silver nanoparticles.
Pls. find the attached files, this long list may help in your research in mechanisms of metal ions uptake and bioreduction by plants, and to understand the possible mechanism of metal nanoparticle formation in plants
http://www.ugcfrp.ac.in/images/userfiles/33670-1a.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3716778/
Borodina V.G., Mirgorod Yu.A. Kinetics and Mechanism of the Interaction between HAuCl4 and Rutin. //Kinetics and Catalysis, 2014, Vol. 55, No. 6, pp. 683–687.
Mirgorod Yu. A., Borodina V.G. Preparation and Bactericidal Properties of Silver Nanoparticles in Aqueus Tea Leaf Extract. //Inorg. Mat. 2013. V.49. No.10. Р.980-983.
Mirgorod Yu. A., Borodina V.G., Borsch N.A. Investigation of Interaction Between Silver Ions and Rutin in Water by Physical Method.// Biophisics. 2013. V.58. N.6. 743-747.
https://www.researchgate.net/publication/215692774_Plant_extract_mediated_synthesis_of_silver_and_gold_nanoparticles_and_its_antibacterial_activity_against_clinically_isolated_pathogens
http://ijmcr.com/wp-content/uploads/2014/02/Paper28165-169.pdf
http://link.springer.com/article/10.1007/s13204-014-0372-8
http://pubs.rsc.org/en/content/articlelanding/2011/gc/c1gc15386b#!divAbstract
http://iopscience.iop.org/article/10.1088/1742-6596/687/1/012033/pdf
https://www.hindawi.com/journals/jnp/2014/963961/
https://pubpeer.com/publications/1A9D4450FF6594B7A71B5A182B228F
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3431837/
Hoping this will be helpful, Best of luck
Regards
Prof. Houda Kawas
Article Plant extract mediated synthesis of silver and gold nanopart...
Dear Raghad Zein
Please look at this link
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3716778/
prof. Houda Kawas thank you for clear and detailed explanation, and for valuable article you send it.
i hope meet you to get more benefit from your experience in plant field.
You most welcome
I'm most of the time, in plant protection department , Fac. of Agric.
Pls. do not hesitate to ask assistance
Regards
Houda KAWAS
Hello Zein,
Have a Look in the following articles, will helpful to understand mechanism behind reduction of AgNO3 into AgNPs.
I hope this may helpful to your research.
All the well wishes for your endeavor.
Article Eco-friendly Synthesis of Gold Nanoparticles and Evaluation ...
Article Green Synthesis of Silver Nanoparticles Using Water Extract ...
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