OLEA EUROPAEA L. YAPRAK EKSTRAKTLARINA DAYALI BAKTERİYEL SELÜLOZUN FİZİKOKİMYASAL ÖZELLİKLERİ VE ANTİOKSİDAN AKTİVİTESİ

Abstract

Bu çalışma, Olea europaea L. yaprak özütleri ile modifiye edilmiş bakteriyel selüloz (BC) biyokompozitlerinin ex situ yaklaşımıyla geliştirilmesini açıklamaktadır. Fenolik bileşikler açısından zengin bir tarımsal yan ürün olan zeytin yaprakları, ultrason destekli bir yöntem kullanılarak ekstrakte edilmiş ve farklı konsantrasyonlarda BC membranlarına dahil edilmiştir. Yapısal analizler (FT-IR, SEM), hidrojen bağı ve BC nanoliflerin morfolojik değişiklikleri ile kanıtlandığı üzere, özütlerin başarılı bir şekilde entegre edildiğini doğrulamıştır. Fonksiyonel analizler, düşük ila orta özüt konsantrasyonlarında su tutma kapasitesinde ve şişme oranında iyileşme gösterirken, daha yüksek konsantrasyonlarda doygunluk etkileri meydana gelmiştir. Antioksidan özelliklerin önemli ölçüde iyileştiği, DPPH inhibisyonu saf BC'de %6,8'den güçlendirilmiş numunelerde %65,5'e yükseldiği ve toplam fenolik içerik 20.000 μg GAE/g'nin üzerine çıktığı tespit edilmiştir. Bu çalışmanın özgünlüğü, daha önce bildirilmemiş olan zeytin yaprağı özütleri ile BC'nin ex situ modifikasyonunda yatmaktadır ve bulgular, tekstil, biyomedikal uygulamalar ve aktif ambalajlar için sürdürülebilir ve biyoaktif malzemelerin geliştirilmesine rehberlik etmek için değerli bir referans sağlamaktadır.

Keywords

• Bakteriyel Selüloz
• Olea europaea L.
• Antioksidan Aktivite
• Biyokompozit

PHYSICOCHEMICAL PROPERTIES AND ANTIOXIDANT ACTIVITY OF BACTERIAL CELLULOSE BASED ON OLEA EUROPAEA L. LEAF EXTRACTS

Abstract

This study describes the development of biocomposites of bacterial cellulose (BC) modified with leaf extracts of Olea europaea L. by an ex situ approach. Olive leaves, an agricultural by-product rich in phenolic compounds, were extracted using an ultrasound-assisted method and incorporated into BC membranes at different concentrations. Structural analyses (FT-IR, SEM) confirmed the successful integration of the extracts as evidenced by hydrogen bonding and morphological changes of the BC nanofibres. Functional analyses showed an improved water holding capacity and swelling ratio at low to medium extract concentrations, while saturation effects occurred at higher concentrations. Antioxidant properties were significantly improved, with DPPH inhibition increasing from 6.8% in pure BC to 65.5% in the fortified samples and total phenolic content reaching over 20,000 µg GAE/g. The originality of this study lies in the ex situ modification of BC with olive leaf extracts, which has not been previously reported, and the findings provide a valuable reference for guiding the development of sustainable and bioactive materials for textiles, biomedical applications, and active packaging.

Keywords

• Bacterial Cellulose
• Olea europaea L.
• Antioxidant Activity
• Bio-composite.

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