Yurdun, Türkan
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Yurdun, Turkan
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Profesör
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turkan.yurdun@fbu.edu.tr
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2
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2
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0
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0
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Article Citation Count: 0Analysis of Selected Steroid Hormones in Sea of Marmara Sediment Samples by Lc-esi/Ms-ms(Istanbul Univ, Fac Pharmacy, 2023) Yurdun, Türkan; Yurdun, Turkan; Eczacılık Meslek Bilimleri BölümüBackground and Aims: Sediment is the general name given to the muddy structure located at the bottom of aquatic environments such as the sea. In our study, the amounts of steroid hormones were investigated in the sediment samples taken from the Marmara Sea. According to other studies, it has been determined that the excess of the hormone load in the sediments may be an indicator of human/animal sourced pollution, as well as the negative effects of the hormones mixed in the seas with the ecological cycle on the health of humans and animals.Methods: In our study, 31 selected human/animal, plant, natural and synthetic hormone-steroids were studied using Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC-ESI/MS-MS). Methanol and QuEChERS were used as extraction methods. Sediment samples were taken from a total of 27 points selected for sampling at the Marmara Sea.Results: According to the results we found, the androgens: androsterone (24.50-1718.18 ng g-1), testosterone (86.30-1600.32 ng g-1); the estrogens: mestranol (33.73-228.32 ng g-1), equilin (53.44-1232.53 ng g-1); the progestagens; pregnenolone (37.50374.76 ng g-1), progesterone (39.96-405.60 ng g-1); levonorgestrel (325.25 and 937.93 ng g-1); the fecal sterols: cholestanone (57.57-1726.32 ng g-1), coprostanol + epicoprostanol (51.43-1370.33 ng g-1); and the plant sterol; campesterol (35.30-1859.90 ng g-1) were the compounds detected.Conclusion: Estrogens and progestogens are active components of birth control pills, and cholestanone and coprostanol + epicoprostanol are steroids that are indicative of human/animal pollution. Coprostanol + epicoprostanol and cholestanone, which are indicators of fecal pollution, were detected in all sediment samples. In our study, steroid hormones were detected for the first time in Sea of Marmara sediments and possible environmental risks were evaluated.Article Citation Count: 0Hplc-Dad Method for the Analysis of Synthetic Dyestuffs in Historical Textile Objects in Istanbul Naval Museum(Yarmouk Univ, deanship Research & Graduate Studies, 2024) Yurdun, Türkan; Erdogan, Gulbin; Dolen, Emre; Yurdun, Turkan; Mubarak, Mohammad S.; Eczacılık Meslek Bilimleri BölümüIn this study, dyestuff analyses of 39 different historical textile artifacts consisting of wool, silk and linen fibers in different colors obtained from the Istanbul Maritime Museum were carried out. These objects were first analyzed considering that they contained only natural dyestuffs in their structures. The results showed, however, that natural dyes were present only in one of the examined samples. Therefore, the analysis was extended for synthetic dyes. For this purpose, a gradient HPLC-DAD method was developed using two solvents, tetrabutylammonium hydrogen sulfate/ammonium acetate and tetrabutylammonium hydrogen sulfate/methanol. Fifty-seven textile samples containing 25 red, 29 green, 1 yellow and 2 blue colored fibers were removed from the investigated objects, treated by the HCl extraction method and analyzed by the developed method. Concerning natural dyestuffs, only carminic acid was detected in a jacket from the Abdulaziz period (Ottoman Empire 1861-1876). The results also revealed that two of the studied samples have UV spectra similar to those of the synthetic dyestuffs Brilliant Blue FCF and Acid Red 52 (Sulforhodamine B). In addition, the historical textile objects were dated according to the information obtained from these results.
