What is Nano chitosan?
Nanochitosan is a natural material with excellent physicochemical properties, making it a superior environ- mentally friendly material, and it possesses bioactivity that does not harm humans. It is frequently used as a controlled- release drug carrier for gene transfer in artificial organs and for immune prophylaxis.
What is Nano gold used for?
Nanoscale gold nanoparticles are being used to connect resistors, conductors, and other elements of an electronic chip. Photodynamic Therapy – Near-IR absorbing gold nanoparticles (including gold nanoshells and nanorods) produce heat when excited by light at wavelengths from 700 to 800 nm.
Are gold nanoparticles safe?
Gold nanoparticles have a good safety profile and are often used as a non-toxic control in many studies. Bulk gold is well known to be safe and chemically inert, and gold-based compounds have been used in the clinic as anti-inflammatory agents to treat diseases such as rheumatoid arthritis.
Is nano gold real gold?
Nano gold is another name for gold nanoparticles. These nanoparticles are a fraction of the size of human hair and are less than 100 nm in diameter. Nano gold particles are so small that it they are generally found as a colloidal solution, which means that the gold nanoparticles are suspended in a liquid buffer.
Why is nano gold red?
The different colors of nano gold come from a phenomenon called surface plasmon resonance. Nanoparticles of gold resonate at frequencies within the visible spectrum of light. Smaller nano gold particles absorb and resonate with purple, blue, green, and yellow wavelengths of light, so they look red.
Is Nano gold toxic?
Citrate-capped gold nanoparticles (13 nm in diameter) were found to be toxic to a human carcinoma lung cell line but not to human liver carcinoma cell line at same dosage (Patra et al. 2007).
Can chitosan be used as a colloid in gold nanoparticles?
Chitosan is polycationic and can therefore be attached to the negatively charged gold nanoparticle surfaces through electrostatic interactions. Using chitosan provides enough steric hindrance to ensure colloid stability and functionalizing nanoparticles that can be used as sensors.
What is the surface profile of unmodified chitosan nanoparticles?
The unmodified chitosan nanoparticles composed of clusters of nanoparticles with sizes ranging from 10 nm to 80 nm. AFM provides a three-dimensional surface profile. The TEM image showed physical aggregation of the chitosan nanoparticles.
How is chitosan used in water treatment?
Chitosan’s chelating properties and gold nanoparticles’ optical properties have been used to detect low concentrations of heavy metal ions in water. Apart from medical applications, chitosan has also been used in water treatment.
What is the molecular weight of chitosan?
The elemental composition of the chitosan polymer is carbon (44.11%), hydrogen (6.84%) and nitrogen (7.97 %). The viscosity average molecular weight of chitosan is ~5.3 x 10 5 Daltons.