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Öğe Enhanced drug carrier capacity after post modification process for amino acid substitute phosphazene based microspheres with anticancer activity(Elsevier, 2023) Özsoy, Fatma; Özay, ÖzgürIn this study, drug carrier HCCP-PP-LEEMP microspheres were synthesized by using Hexachlorocyclotriphosphazene (HCCP), Phenolphthalein (PP) and L-Lysine Ethyl Ester Dihydrochloride (LEE) by polycondensation reaction. The synthesized spheres were modified in an acidic environment, and a cationic charge was formed on their surfaces. Synthesized and quaternized microspheres were characterized using FT-IR, SEM, TEM, TGA and Zeta (& zeta;) potentials analyzes. HCCP-PP-LEE-ATA-QMP microspheres with increased anionic drug carrying capacity as a result of quaternization were used as carriers for Sodium Diclofenac (NaDc) and Cimetidine drugs. While the unmodified HCCP-PP-LEEMP microspheres did not retain the NaDc drug, the NaDc drug retention capacity of the quaternized HCCP-PP-LEE-ATA-QMP microspheres was calculated as 99.6677 mg/ g. Thus, it was determined that the drug holding capacity of the microspheres could be increased tens of times compared to their initial state, thanks to the positive charges formed on the surface of the drug carrier micro spheres as a result of quaternization. At the same time, Cimetidine, a type of chemotherapeutic drug, was loaded into the microsphere using as drug delivery system. In vitro drug release behaviors of the developed phosphazene and amino acid-based delivery system were investigated and drug release kinetic models were determined. In addition, the antibacterial and antifungal effects of the microspheres were investigated with the effect of LEE in the structure of the microspheres. Then, the anticancer behavior of the cimetidine-loaded microspheres was tested on HT-29 colon cancer cell lines. Thus, a potential carrier system that can carry drugs for the treatment of a selective disease or chemotherapeutics for the treatment of cancer has been synthesized.Öğe Phosphazene-based nanostructures modified with gold nanoparticles as drug and gene carrier materials with antibacterial and antifungal properties(Taylor and Francis Ltd., 2023) Özsoy, Fatma; Özay, ÖzgürIn this study, monodisperse spherical particles were synthesized by using hexachlorocyclotriphosphazene (HCCP) and 1-(2-Aminoethyl) piperazine (AEP) by the polycondensation reaction. Then, the surfaces of the synthesized nanospheres were functionalized with gold nanoparticles. Phz-AEP nanospheres and phz-AEP@Au nanocomposite were characterized by various methods. Drug release studies for the synthesized phz-AEP and phz-AEP@Au nanospheres were performed using a ribonucleic acid (RNA) and sodium diclofenac (NaDc). As a result of the release studies, the drug release kinetics of the nanospheres were investigated. Additionally, the antibacterial and antifungal effects of the synthesized phz-AEP and phz-AEP@Au nanocomposite spheres were tested.Öğe RNA veya ilaç taşıyıcı olarak fosfazen nanokompozitlerinin sentezi ve karakterizasyonu(Çanakkale Onsekiz Mart Üniversitesi, 2023) Özsoy, Fatma; Özay, ÖzgürBiyomedikal alanındaki hızlı gelişmelerle birlikte mikro/nanopartiküller, polimerik sistemler, miseller ve hidrojel sistemleri gibi birçok ilaç dağıtım sistemi, özellikle kanser tedavisi ve doku mühendisliği olmak üzere birçok hastalığın klinik tedavisinde sayısız avantaj sunmaktadır. Günümüzde, ilaç dağıtım sistemleri, sistemik dağıtımdan organ ve hücresel hedeflemeye kadar sürekli ve kontrollü ilaç salımı için gelişmiş programlanabilir dağıtım sistemlerine geçiş yapmıştır. Yapılan çalışmada halkalı yapıya sahip bir tür fosfazen kullanılarak nano ve mikro boyutlarda farklı kompozit partiküller sentezlendi. Sentezlenen partiküller bir ilaç/gen taşıyıcı olarak hedef ilaç ve hastalığa göre farklı yöntemler ile modifiye edildi. İlk aşamada tRNA taşınması amacıyla sentezlenen nanopartiküller altın nanopartiküller ile modifiye edilerek metal kompozitleri oluşturuldu. İkinci aşamada kanser tedavisi amacıyla yapısında bir tür aminoasit bulunduran mikropartiküller sentezlendi ve kuarternize edilerek elektrostatik etkileşimler yardımıyla ilaç tutma kapasiteleri artırıldı. Her iki sistemin de uygun tampon çözeltiler içerisinde in vitro ilaç salım davranışları araştırıldı. İlaç salım davranışlarını incelemek için partiküller farklı kinetik modeller kullanılarak matematiksel olarak modellendi. Mikro/nanopartiküller FT-IR, TEM, SEM-EDX, TGA, XRD, XPS gibi aletsel yöntemler kullanılarak ayrı ayrı karakterize edildi. Ayrıca partiküllerin antibakteriyel özellikleri, Escherichia Coli, ATCC 8739 (gram-negatif), Staphylococcus Aureus, ATCC 6538 (gram-pozitif), Pseudomonas Aeruginosa, ATCC 27853 (gram-negatif), bakteri türleri ve Candida Albicans, ATCC 90028 (bir tür mantar), gibi farklı bakteri türleri üzerinde araştırıldı. Son olarak mikropartiküllerin antikanser özelliği in vitro HT-29 kolon kanseri hücreleri üzerinde denendi.Öğe Self-assembled silibinin-containing phosphazene/cystamine hybrid nanospheres as biodagradable dual-drug carriers with improved anticancer activity on a breast cancer cell line(Elsevier, 2023) Özsoy, Fatma; Cömert Önder, Ferah; Ilgın, Pınar; Özay, Hava; Önder, Alper; Özay, ÖzgürIn this study, pH and redox sensitive biodegradable PPZs@Silibinin polymeric nanospheres were synthesized by the polymerization reaction of Hexachlorocyclotriphosphazene (HCCP), Cystamine dihydrochloride (CA) and the anticancer drug Silibinin as monomers. Later designed as a therapeutic system, this nano drug-carrier was also loaded with Doxorubicin (Dox), a type of cancer drug. As a result, a drug self-delivery system (DSDS) was developed, which had the property of biodegradation in tumor tissues thanks to the redox active disulfide bonds in its structure from pH-sensitive nanospheres containing two anticancer drugs. Biodegradation-associated in vitro release of cancer drug (Dox) from the Dox loaded PPZs@Silibinin nano drug-carrier was performed in the presence of glutathione (GSH) at pH 6.5 and pH 7.4. While 93.06% Dox release was observed in pH 6.5 medium containing 10 mM GSH in 24 h, this value was 56.60% in pH 7.4 + 10 mM GSH medium. In addition, clonogenic analysis and cytotoxicity studies were performed on the MDA-MB-231 cell line to determine the anticancer properties of PPZs@Silibinin loaded with Dox. It was determined that PPZs@Silibinin@Dox nanospheres containing 20.5 nM Dox for 0.75 mu L are highly effective in MDA-MB-231 cells than free Dox.
