Su rface Plasmon Resonance of Silver Nan oparticles for dete rmination of ascorbic acid in food and Phar maceutical Samples

Ascorbic acid (V itamin C), a water-soluble vitamin, is impor tant in for ming collagen, a protein that gives structure to bones, muscles an d blood vessels. Fruit s and vegetables constitute the principle source of vitamin in most hum an [۱].Metal nanoparticles such as silver nanoparticles (AgNPs) have been found wide applic ations for an alytical purposes due to the uniq ue optical and electric properties. These properties contain the collective oscillation of conductive electr ons under the excitation of a light beam know n as localized surface pl asmon reson ance (LSPR ). This phen omenon depends on the size, shape and dielectric environ ment of nanoparticles, metal nanoparticles exhibit a strong UV-Vis absorption band [۲]. T herefore, the geometry of metal nanoparticles would provide important control over linear and nonlin ear optical properties. T he primary consequenc es of LSPR excitation are selective photon abso rption, and local electro magnetic field enhance ment.

کلیدواژه ها:

Silver nanoparticles ، Ascorbi c acid ، Spe ctrophotometeric determ ination ، .Plasmon resona nce