Study of the Nuclear Magnetic Resonance and Physical Properties of Iodine

Abstract

Dental caries is mostly caused by Streptocuccus mutans, and the pathogencity of this species is mainly due to the biofilm formation. Silver nanoparticles were produced using the cinnamon bark extract. It was noted that the potential for biosynthesizing silver nanoparticles occurred through color change, as the color of the mixture consisting of the extract of the cinnamon bark and silver nitrate changed from colorless to yellow within one hour, then after eight hours of incubation, to dark brown. The synthesized silver nanoparticles were characterized by the formation of a 431 nm wavelength absorption band, indicating the production of silver nanoparticles. The sizes of the silver nanoparticles were then determined through a scan electron microscope, where their average sizes ranged between 29.59-53.89 nm, while FTIR determined the functional groups for them and the proteins that can bind to silver nanoparticles have a ranged between   593.4 - 2978.4 cm^-1. Six (24%) isolates belonged to Streptococcus. mutans were obtained from the dental plaques of patients with tooth decay. S. mutans showed complete resistance to ampicillin, cefepime, and amoxicillin while demonstrated sensitivity to erythromycin, tetracycline, and to ciprofloxacin. Antibacterial activity of silver nanoparticle revealed that when the concentrations increase, the inhibition zone of multidrug resistant S. mutant isolates maximized until it reached a maximum inhibition of 200 µg/ml. when silver nanoparticle mixed with more resistant antibiotics, the antibacterial properties were strengthened by the presence of silver nanoparticles. of the majority of resistance antibiotics, such as ampicillin, gentamicin, cefepime, and amoxicillin against S. mutant.