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AYAZ SEYHAN, SERAP

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AYAZ SEYHAN

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    PublicationOpen Access
    The extraction and determination of ellagic acid and resveratrol in blueberry species by HPLC-DAD and LCMS/MS
    (2023-01-01) AYAZ SEYHAN, SERAP; Seyhan S., Yalcin G., AYAZ SEYHAN S.
    © 2023 Marmara University Press.Ellagic acid (EA) and resveratrol (RES) are phenolic compounds naturally found in fruits. However, a significant amount of RES and EA is present in berries and their effective isolation enables the production of functional foods. In this study, EA and RES found in four highbush (Vaccinium corymbosum) blueberry varieties (Bluecrop, Brigitta, Darrow and Bluejay) were analyzed simultaneously for the first time. A chromatographic method was developed for EA and RES by HPLC-DAD and LC-MS/MS. Furthermore, pressurized liquid extraction (PLE) method was performed for the extraction of EA and RES from blueberry samples. LOD (limit of detection) and LOQ (limit of quantification) were determined as 0.1898x10-6 mol.L-1 and 0.5694x10-6 mol.L-1 for RES, 0.1271x10-6 mol.L-1 and 0.3814x10-6 mol.L-1 for EA, respectively. All the results were reevaluated according to 91.85% and 84.97% recovery value, for EA and RES, respectively. The amount of EA and RES were found out in the range of 1.65-9.16 mg/kg and 2.95-9.31 mg/kg in the lyophilized blueberry varieties.
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    PublicationOpen Access
    Production, characterization, and antioxidant activity evaluation of Rheum Ribes L. extract-loaded PLA/PEG nanofibers
    (2023-01-01) AYAZ SEYHAN, SERAP; BİLĞİÇ ALKAYA, DİLEK; AYAZ SEYHAN S., Demirel A. B., Cesur S., BİLĞİÇ ALKAYA D.
    © 2023 Marmara University Press.The use of natural compounds such as biocompatible and non-toxic plant extracts, without undesired side effects, in tissue engineering applications, is highly preferred compared to chemical drugs. In recent years, many studies have been carried out to produce nanofibrous materials produced by electrospinning of bioactive plant extracts. Electrospun nanofibers have very large surface area, controllable pore size, and tunable drug release profiles. Several biocompatible polymers with excellent biocompatibility and biodegradability including poly ethylene glycol (PEG) and poly-lactic acid (PLA) have been widely used for the synthesis of nanofibers using the electrospun technique. The ethanol-water extract of the root parts of the Rheum ribes L. plant has antioxidant, antimicrobial, and antiurease effects. In this study, the characterization and performance of electrospun Rheum ribes L.-loaded (20 mg, 40 mg, and 60 mg in 20mL) poly (lactic acid) (PLA) (8%, w/v) /Polyethylene glycol (PEG) (1%, w/v) /Tween 80 (3%, w/v) nanofibrous mats for skin tissue engineering were investigated. Morphological (SEM), molecular interaction (FT-IR), thermal analysis (DSC), antioxidant activity and physical analysis were carried out after the production process. According to the results obtained, Rheum ribes L.-loaded PLA/PEG nanofibers have smooth fiber morphology in fine structure without beads, proper tensile strength and antioxidant activity. Consequently, Rheum ribes L.-loaded nanofibrous mats are suitable for skin tissue engineering applications.