Person: ÇELİK, BURAK
16 results
Search Results
Now showing 1 - 10 of 16
Publication Metadata only Apolipoprotein E4 Mediated Targeting of Blood Brain Barrier Using Nano-Micellar Metal Chelators for Treatment of Alzheimer’s Disease(2015-08-06) BAHADORİ, FATEMEH; ÇELİK, BURAK; Kazdal, Fatma; KUŞMAN, TUBA; BAHADORİ, FATEMEH; ÇELİK, BURAK; KUŞMAN, TUBAPublication Open Access Design, optimization and characterization of coenzyme Q10-and D-panthenyl triacetate-loaded liposomes(2017-01-01) Celik, BURAK; Sagiroglu, ALİ; Ozdemir, Samet; ÇELİK, BURAK; ASRAM SAĞIROĞLU, ALİCoenzyme Q10 (CoQ10) is a lipid-soluble molecule found naturally in many eukaryotic cells and is essential for electron transport chain and energy generation in mitochondria. D-Panthenyl triacetate (PTA) is an oil-soluble derivative of D-panthenol, which is essential for coenzyme A synthesis in the epithelium. Liposomal formulations that encapsulate both ingredients were prepared and optimized by applying response surface methodology for increased stability and skin penetration. The optimum formulation comprised 4.17 mg CoQ10, 4.22 mg PTA and 13.95 mg cholesterol per 100 mg of soy phosphatidylcholine. The encapsulation efficiency of the optimized formulation for CoQ10 and PTA was found to be 90.89%±3.61% and 87.84%±4.61%, respectively. Narrow size distribution was achieved with an average size of 161.6±3.6 nm, while a spherical and uniform shape was confirmed via scanning electron microscopy and transmission electron microscopy images. Cumulative release of 90.93% for PTA and 24.41% for CoQ10 was achieved after 24 hours of in vitro release study in sink conditions. Physical stability tests indicated that the optimized liposomes were suitable for storage at 4°C for at least 60 days. The results suggest that the optimized liposomal formulation would be a promising delivery system for both ingredients in various topical applications. Keywords: coenzyme Q10, D-panthenyl triacetate, liposomes, response surface methodology, stabilityPublication Metadata only Hedeflendirilmiş Nanoilaçlar(2017-09-01) ÖNYÜKSEL, Hayat; BAHADORİ, FATEMEH; ÇELİK, BURAK; BAHADORİ, FATEMEH; ÇELİK, BURAKPublication Metadata only Therapeutic Potential of Drug Delivery by Means of Lipid Nanoparticles: Reality or Illusion?(2017-01-01) Uner, Melike; Damgali, Sukran; Ozdemir, Samet; Celik, BURAK; ÇELİK, BURAKBackground: Solid lipid nanoparticles (SLN) are colloidal drug carrier systems that contribute several properties required from a sophisticated drug delivery system for increasing drug bioavailability and providing effective therapy. Many advantages of SLN have been reported over traditional dosage forms and their colloidal counterparts since the early 1990s. They were optimized for oral drug delivery for the first time. The first SLN formulations were produced by reducing particle size of solid lipid microparticles by spray congealing technique in the late 1980s. Then, studies have been continued investigating for their different administration routes else including parenteral, transdermal, ocular, nasal, respiratory etc.Publication Open Access Risperidone mucoadhesive buccal tablets: formulation design, optimization and evaluation(2017-11-01) ÇELİK, BURAK; ÇELİK, BURAKThe aim of this study was to design and optimize risperidone (RIS) mucoadhesive buccal tablets for systemic delivery as an alternative route. Direct compression method was used for the preparation of buccal tablets, and screening studies were conducted with different polymers to determine their effects on tablet characteristics. Carbopol® (CP) and sodium alginate (SA) were selected as two polymer types for further optimization studies by applying response surface methodology. Tablet hardness (TH), ex vivo residence time (RT), and peak detachment force (DF) from buccal mucosa were selected as three important responses. Physicochemical compatibility of formulation excipients and RIS was evaluated by using Fourier transform infrared (FT-IR) spectroscopy and differential scanning calorimetry (DSC) analysis. In vitro drug release profiles and release kinetics were investigated; swelling index and matrix erosion studies were conducted. Optimum formulation consisted of 16.4% CP and 20.3% SA, which provided 7.67±0.29 hour ex vivo RT, 45.52±4.85 N TH, and 2.12±0.17 N DF. FT-IR spectroscopy and DSC analysis revealed that there was no chemical interaction present between tablet ingredients. Cumulative RIS release of .90% was achieved after 8 hours of in vitro dissolution studies, which was supported by swelling and matrix erosion analysis. Mechanism of RIS release was fitted best to zero-order model, while release exponent (n) value of 0.77 demonstrated an anomalous (non-Fickian) release, indicating combined erosion and swelling mechanism. The results suggested that optimized buccal tablets of RIS would be a promising and alternative delivery system for the treatment of schizophrenia.Publication Metadata only Optimization of piribedil mucoadhesive tablets for efficient therapy of Parkinson-s disease: physical characterization and ex vivo drug permeation through buccal mucosa(2017-01-01) Celik, BURAK; Ozdemir, Samet; Demirkoz, Asli Barla; Uner, Melike; ÇELİK, BURAKObjective: The aim of this study was optimization of buccal piribedil (PR) mucoadhesive tablets to improve its low bioavailability and provide controlled release for the treatment of Parkinson-s disease.Publication Metadata only Eplerenone nanoemulsions for treatment of hypertension. Part II: Physical stability assessment and in vivo study(2018-06-01T00:00:00Z) Ozdemir, Samet; Celik, BURAK; Sumer, Engin; Acar, Ebru Turkoz; Uner, Melike; ÇELİK, BURAKThe aim of the present complimentary study was to investigate physical stability of eplerenone (EP) loaded nanoemulsions and to evaluate their pharmacokinetic profiles after subcutaneous application to Sprague Dawley rats. Nanoemulsions were prepared by using high shear homogenization and ultrasonication techniques. All formulations were having 0.1% EP. They were obtained in 150.6 nm-205.8 nm size range. Physical stability of nanoemulsions was monitored storing them at different thermal conditions for 120 days. Droplet size was confirmed to be affected by storage temperature when it slightly changed at 4 +/- 2 degrees C and 25 +/- 2 degrees C. 40 +/- 2 degrees C was found not to be suitable as a storage condition in general. Pharmacokinetic study on physically stable formulations demonstrated that subcutaneously applied eplerenone solution showed that AUC(0)->infinity and C-max were 1.62 and 2.05 folds higher than eplerenone solution after oral administration. Additionally, AUC(0)->infinity and C-max were significantly increased in the case of nanoemulsions prepared with Brij (R) 35 and Tween (R) 80. Relative bioavailability of the drug was found to be remarkably increased after administration of formulations stabilized with Tween (R) 80. Results suggested that eplerenone loaded nanoemulsions may provide an alternative application way for efficient management of hypertension attacks.Publication Metadata only Plant extracts as metal chelators for treatment of Alzheimer’s disease(2015-08-06) Kazdal, Fatma; ÇELİK, BURAK; BAHADORİ, FATEMEH; Ertaş, Abdulselam; ÇELİK, BURAK; BAHADORİ, FATEMEHPublication Metadata only Design, preparation and characterization of liposomal formulation used for wound healing(2017-10-04) ASRAM SAĞIROĞLU, ALİ; ÇELİK, BURAK; ÖZDEMIR, S; ASRAM SAĞIROĞLU, ALİ; ÇELİK, BURAKPublication Metadata only Intraocular pressure in infants and its association with hormonal changes with vaginal birth versus cesarean section.(2016-12-01) Elbay, AHMET; CELIK, U; CELIK, BURAK; OZER, OF; KILIC, GÖKHAN; AKKAN, JC; BAYRAKTAR, BİLGE; KAYMAK, NZ; ELBAY, AHMET; ÇELİK, BURAK; ÖZER, ÖMER FARUK; KILIC, GÖKHAN; BAYRAKTAR, BILGE