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    Cellulose fibers production from agricultural waste and use as functional cellulose additive in polylactic acid bioplastic films
    (Field Crops Central Research Institute, 2026) Boran, Filiz; Guzel, Nihal; Irmak, Emel Tamahkar; Yasan, Ömer Barışkan; Karaca, Selin; Erbay, Betul Turel
    This study explores a sustainable method for bioplastic production using agricultural waste. Polylactic acid (PLA)-based films were developed by incorporating cellulose extracted from rice husks (RH) and sunflower stalks (SS). The cellulose extraction process achieved an average efficiency of 85% based on total agricultural waste mass. Chemical structures of PLA and composite films were examined using FTIR spectroscopy. All films were flexible and transparent, with pure PLA films exhibiting higher transparency. Such properties make PLA films ideal for packaging, biomedical, and electronic applications due to their lightweight and adaptable nature. Films containing SS-derived cellulose showed slightly greater thickness (0.197–0.232 mm) compared to those with RH cellulose. FTIR analysis revealed interactions between PLA and cellulose, indicated by reduced intensity of the –OH stretching band at 3338 cm-1 and PLA characteristic peaks at 1452, 1748, and 1181 cm-1. These changes suggest hydrogen bonding and limited polymer chain mobility due to conformational adjustments. The spectra of composite films resembled those of PLA and cellulose, confirming enhanced crystallinity and molecular interactions. This is the first comparative study using cellulose from both RH and SS in PLA-based bioplastics, demonstrating their combined potential as sustainable reinforcements for biodegradable materials. © 2026 Field Crops Central Research Institute. All rights reserved.
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    Polyvinylalcohol/Polyethyleneimine Hydrogels: Evaluation of Swelling, Dehydration and Antibacterial Activity
    (2024) Tamahkar, Emel; Özkahraman, Bengi; Bayrak, Gülşen; Perçin, Işık; Ciğeroğlu, Zeynep; Boran, Filiz
    In the present study, Polyvinylalcohol/polyethyleneimine (PVA/PEI) hydrogels designed with different Glutaraldehyde (Glu) amount, PEI amount and PVA concentration were synthesized via solvent casting technique. The fabricated PVA/PEI hydrogels with different compositions were evaluated for swelling rate, dehydration properties and antibacterial activity to determine superior combination. The swelling tests were performed for 0-300 min at pH 7.4 and 37 °C. All of the prepared PVA/PEI hydrogels swelling ratio were observed in the range of 221-321%. The highest dehydration rate was found for the PVA/PEI hydrogel with the lowest PVA concentration and the lowest dehydration rate was found for the PVA/PEI hydrogel with the highest Glu amount. All the PVA/PEI hydrogels demonstrated high antibacterial activity against E.coli. PP5 (prepared with 5% PVA, 0.5 mL PEI and 30 µL Glu) was determined as the selected hydrogels with optimized characteristics in respect to swelling, dehydration and antibacterial activity data. This study highlights potential usage of the resultant PVA/PEI hydrogels as antibacterial wound dressings in wound care applications.