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Antibacterial effect of polylactic-co-glycolic acid/selenium nanocomposite against dental biofilm

Safaei Mohsen, Khaleseh Farnoosh, Ahmadi Saba, Mobarakeh Mohammad Salmani, Law Douglas, Wong Ling Shing, Ravinder D., Nhlapo Amos, Hashim Mohd, Parveen Azra

Polimery

2025

Vol. 70, nr 3

186--193

To determine the optimal conditions for obtaining poly(lactic-co-glycolic) acid with selenium (PLGA/selenium) nanocomposites the Taguchi method was used. FT-IR, Raman spectroscopy, XRD and FESEM analysis confirmed the nanocomposites’ structure. The nanocomposite containing 6 mg/mL of selenium obtained in the process where the mixing time was 75 min showed the highest antibacterial activity against Streptococcus mutans. The obtained nanocomposites are an innovative approach to im-proving oral health and can be used as antibacterial materials for medical and dental applications.

Metodą Taguchi określono optymalne warunki otrzymywania nanokompozytów poli(kwasu mlekowego-co-glikolowego) z selenem (PLGA/selen) i oceniono ich aktywność przeciwbakteryjną przeciwko Streptococcus mutans. Najwyższą aktywnością przeciwbakteryjną charakteryzował się nanokompozyt zawierający 6 mg/mL selenu (czas mieszania 75 min). Strukturę nanokompozytu potwierdzono metodą FT-IR, spektroskopii Ramana, XRD i FESEM. Nanokompozyty PLGA/selen stanowią nowe podejście do poprawy zdrowia jamy ustnej i mogą być stosowane jako materiały przeciwbakteryjne do zastosowań medycznych i stomatologicznych.

Solid state dye-sensitized solar cells based on barium strontium titanate nanorod film

Safaei Mohsen, Ali Thamir Hassen, Salman Odai N., Ismail Mukhlis M., Wong Ling Shing, Hashim Mohd., Ahmed Ateeq

Advances in Science and Technology. Research Journal

2025

Vol. 19, no. 7

328--337

Perovskite Barium strontium titanate (Ba0.7Sr0.3TiO3 (BST)) nanorod film has been effectively produced and characterized hydrothermal. Prepared TiO2 nanorods hydrothermally; after that, they were deposited on an FTO substrate for 150 °C at four h. X-ray diffraction (XRD) showed that the Ba0.7Sr0.3TiO3 film was polycrystalline with a low trace of peaks that belonged to TiO2, indicating that the BST films needed more reaction time. According to the optical properties, the band gap of the BST nanorod film was 3.16 eV, and strong photoluminescence centred at 367 nm. The data from the BST film can be used to calculate the energy gap (Eg). A DC conductivity measurement showed that it increases with increasing temperature up to the Curie temperature, and the behaviour was the opposite. Photoelectrode properties like open circuit voltage (Voc), short circuit photocurrent density (Jsc), fill factor FF, and efficiency have been measured. The efficiency was 0.071 when preparing Solid-state dye-sensitized solar cells (ss-DSSCs) based on BST film.