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    Antioxidant enhancement of Cystoseira barbata extracts via nanoliposomal encapsulation
    (2025) Cafer, Melih; Tuney, Inci; Çağal, Münevver
    Seaweeds are well-known for their numerous health benefits, which include antioxidant, antimicrobial, antitumor, and anti-inflammatory properties. They produce secondary metabolites to withstand extreme conditions such as high temperatures, fluctuating salinity, intense sunlight, and varying oxygen levels. These compounds not only serve as protective mechanisms for the seaweeds but also hold potential for medicinal applications and other biologically active uses. In this study, we investigated the effects of nanoliposomal encapsulation on the antioxidant capacity of extracts from Cystoseira barbata, collected from the Bursa/Mudanya coast. The extract was obtained from dried algal samples using ethanol solvent at a ratio of 1:1. The total phenolic content of the extract was analyzed, revealing the highest phenol concentration of 2.66 mg GAE/g. The DPPH assay was conducted to assess the antioxidant capacity of both free extract (FE) and the nanoliposomal encapsulated extract (NE). Inhibition (%) values showed a positive correlation with concentration, yielding values of 19.41 for FE and 31.33 for NE. Nanoliposomal encapsulation enhanced DPPH scavenging capacity by 61% compared to FE. Thus, the nanoliposomal encapsulation technique appears to be a promising method for enhancing the effectiveness of C. barbata extracts as antioxidant agents.
  • Küçük Resim Yok
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    Targeted delivery of seaweed bioactives: liposomal encapsulation of Ulva lactuca and Codium fragile for antibacterial enhancement
    (Springer Heidelberg, 2025) Ak, Esra; Guven, Pelin; Tuney, Inci; Cagal, Munevver Muge
    Seaweeds are promising natural sources of antimicrobials and antioxidants; however, their direct use is often limited by the lack of effective targeted delivery systems. The main objective of this study was to investigate the effects of liposomal encapsulation on enhancing the antimicrobial action of seaweed bioactives. A liposomal formulation was developed to encapsulate extracts from the green seaweeds Ulva lactuca and Codium fragile subsp. fragile, sourced from the Aegean Sea and the Marmara Sea. Physicochemical characterizations of liposomal formulations (size, charge, polydispersity index) were evaluated by dynamic light scattering technique. The encapsulation efficiency (EE%) of liposomal U. lactuca Marmara (Lipo-ULM), liposomal U. lactuca Aegean (Lipo-ULA), liposomal C. fragile subsp. fragile Marmara (Lipo-CM), liposomal C. fragile subsp. fragile Aegean (Lipo-CA) were calculated as 61.63, 70.73, 67.56, and 76.92, respectively. FTIR analysis has confirmed the encapsulation. Antibacterial activities of the free extracts and the liposomal formulations were evaluated against Escherichia coli ATCC 25922 and Staphylococcus aureus ATCC 25923 using minimum inhibitory concentration (MIC) assays. Lipo-ULM and Lipo-ULA displayed MIC values of 1.25 mu g/mu L against both bacterial strains, compared to 2.5 mu g/mu L for their free extracts. Lipo-CM and Lipo-CA showed even more activity, with MIC values of 0.0025 mu g/mu L, while the free extracts of CM and CA presented 0.0050 mu g/mu L. Furthermore, free and liposomal encapsulated extracts revealed similar DPPH radical scavenging capacity. This study presents a novel liposomal encapsulation system that holds promise for enhancing the effectiveness of edible seaweed extracts as antibacterial agents for application in the pharmaceutical and food industries.