فهرست مطالب فهیمه نوجوکی

Nanosilver is a nanotechnology product with antimicrobial property. It can improve efficiency, reduce cost and increase antimicrobial durability and performance of wound dressing.

This research intended to introduce a dressing that accelerated and improved the wound healing process by keeping the wound area moist and simultaneously prevented colonization by microorganisms and wound infection.

Silver nanoparticles were trapped in the pores of calcium alginate sheets, and particle loading on films took place. When this dressing is put on a wound, the silver ions are released in the wound area. After loading the silver nanoparticles; their presence in the calcium alginate structure was confirmed by FE-SEM micrographs. Wounds (2 × 2 cm2) were made on rats’ bodies and images were taken of the wound healing process on the 1st, 7th, and 14th days to study the effect of the dressing on tissues of living organisms.

Characterization of silver nanoparticles was carried out by the DLS test and Zeta potential measurement, in which the values of 61.4 nm and -20.83 mV were obtained, respectively. Antibacterial properties were studied and cell toxicity tests were performed to determine the suitable concentration. Results indicate that the optimum concentration was 100μg/l (or 17.5μg per unit area of the alginate film). Using the ImageJ software, the surface areas of the wounds were calculated, and histological studies were also conducted on wound healing. Moreover, on the 7th and 14th days, samples were taken of them to carry out histopathological investigations, and changes in skin cell shape were studied.

The results of this study suggestthat the dressing accelerates simultaneously the process of wound healing and prevents wound infection and postponement of its repair.
Conflict of interest: non declared

Ganoderma lucidum is a main source of ganoderic acid. This metabolite has pharmaceutical effects such as cancer treatment. However, due to low yields and high prices, clinical application is difficult. Stimulants such as elicitor and mechanical shocks can be used to increase the produce of ganoderic acid effectively. This study aimed to investigate the effect of ultrasound on the production of this medicine.
In this study, a liquid culture of the fungus treated with the once and twice at 20 and 200 seconds of sound with a frequency of 50 kHz and constant output power in ultrasonic bath was investigated. After extraction of ganoderic acid and ensure of positive impact of shock, to optimize variables, response surface methodology was used. In this method, 17 experiments with three variables, the first time ultrasound (4, 5, 6 days), the second ultrasound (7, 8, 9 days) and time of ultrasound (60, 180, 300 seconds) by Design Expert software were designed and done.
The results showed that the effects of ultrasound stimulation with twice 274 seconds treatment on days 4 and 7 were established highest ganoderic acid production. By comparing samples with control (without sound) Increase in extracellular ganoderic acid to intracellular ratio was determined. In optimum conditions, 34% increase in GA production relative to the control sample was observed.
Ultrasound can be used as a non-chemical and cheap stimulus, increase ganoderic acid production.