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OfflineNeoSporen
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Biosynthesis of Silver Nanoparticles by Fungus Trichoderma Reesei (A Route for Large-Scale Productio * 2
    #16430646 - 06/24/12 12:36 PM (11 years, 7 months ago)

It's easier to just follow the link, allowing you to view pictures, graphs, and have the article in it's correct format.

Abstract:

    One of the requirements for advancement of nanotechnology are the development of reliable experimental protocols for the synthesis of nanomaterials over a range of biological compositions, sizes and high monodispersity. An attractive possibility of green nanotechnology is to use micro-organisms in the synthesis of nanoparticles. Recently, the utilization of biological systems, especially fungi, has emerged as a novel method for the
synthesis of nanoparticles. Nanoparticles are considered as fundamental molecular building blocks for nanotechnology. They are the starting points for preparing many nanostructured materials and devices. In this paper we report the extracellular biosynthesis of silver nanoparticles (AgNPs) by using a fungus named Trichoderma Reesei (also known as Hypocrea jecorina). In the biosynthesis of AgNPs by this fungus, the fungus mycelium is exposed to the silver nitrate solution. That prompts the fungus to produce enzymes and metabolites for its own survival. In this process the toxic Ag+ ions are reduced to the nonetoxic metallic AgNPs through the catalytic effect of the extracellular enzyme and metabolites of the fungus. Absorption UV-Visible light spectroscopy is used to follow up with the reaction process. Fluorescence emission spectroscopy is used to produce detailed information on the progress of reduction of silver nitrate (formation of silver nanoparticles)
on the nanosecond timescale. Fourier transform infrared spectroscopy is used for quantitative analyses of the reaction products. Our measurements indicate that extracellular
biosynthesis of AgNPs by Trichoderma reesei produces AgNPs with the diameters in the range of 5-50 nm. Trichoderma Reesei is an environmentally friendly fungus, and it is well known for its formation of extracellular enzyme and metabolites in very large amounts, much higher than other fungi. The present process is an excellent candidate for industrial scale production of silver nanoparticles.

http://journal.insciences.org/wp-content/files_mf/1664_171x_1_1_65.pdf


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OfflineHumility
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Re: Biosynthesis of Silver Nanoparticles by Fungus Trichoderma Reesei (A Route for Large-Scale Productio [Re: NeoSporen]
    #16432654 - 06/24/12 07:50 PM (11 years, 7 months ago)

Nanoparticles meaning they will be able to grow nano, micro or maybe milligrams of silver?


Or as in they'll be able to grow gram or possibly even kilogram quantities?

That'd change the whole game, for silver at least.


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Offlinefatrat
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Re: Biosynthesis of Silver Nanoparticles by Fungus Trichoderma Reesei (A Route for Large-Scale Productio [Re: Humility]
    #16433430 - 06/24/12 10:26 PM (11 years, 7 months ago)

I dont think they are growing silver. If I understood they are using the fungus as a means to convert silver into workable particles. The methods used to obtain these building blocks are fundamental to any work in nanotechnology, so a green way to make them is the starting point for green nanotechnology.


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Offlineindraclee
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Re: Biosynthesis of Silver Nanoparticles by Fungus Trichoderma Reesei (A Route for Large-Scale Productio [Re: fatrat]
    #16434836 - 06/25/12 09:04 AM (11 years, 7 months ago)

Silver nanoparticles are different than particles of silver. Macroscopic silver is the typical kind of shiny metal we think of.  Silver nanoparticles could be pretty much any color (because things absorb different frequencies of light at different size scales) and will be between 1 and 100 nm in size.  That means a billion of them would fit in a thin 3 foot line.  Particles have vastly different properties at different sizes and silver, although used mainly for aesthetic purposes at the macroscopic level, is useful for bone cements, surgical instruments, surgical masks, and wound dressings on the nanoscale.


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Offlineaperson444
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Registered: 10/12/10
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Re: Biosynthesis of Silver Nanoparticles by Fungus Trichoderma Reesei (A Route for Large-Scale Productio [Re: indraclee]
    #16437366 - 06/25/12 07:21 PM (11 years, 7 months ago)

Silver nanoparticles are really interesting materials. They can be used for various antimicrobial applications -- especially water purification. In addition, note that these fungi can immobilize soluble silver ions (Ag+), which could hint at potential uses in bioremediation.

This isn't all to new. Many microscopic/macroscopic organisms can reduce metal ions to insoluble metal particles. The fact that this is an easy method for producing silver NANO-particles makes it more exciting.


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