https://hdl.handle.net/11436/65 Fri, 25 Sep 2026 01:34:40 GMT 2026-09-25T01:34:40Z https://hdl.handle.net/11436/9725 White tea consumption alleviates anthropometric and metabolic parameters in obese patients Akyıldız, Kerimali; Yılmaz, Adnan; Avcı, Uğur; Toraman, Merve Nur; Yazıcı, Zihni Açar Background and Objectives: Obesity and related disorders are an increasing global health problem. Achieving and maintaining long-term weight loss through lifestyle changes and/or pharmacological interventions have not met expectations. Dietary supplements and alternative treatments have also shown limited effectiveness in this regard. The consumption of green tea in general has been shown to benefit obese patients, with effects attributed to caffeine, catechins, polyphenols and other components. However, the potential of white tea to prevent and treat the negative effects of obesity has not been addressed so far. In this study, the effect of white tea (WT) consumption in obese individuals was anthropometrically and biochemically investigated. Materials and Methods: Based on anthropometric and biochemical assessments, the patients were assigned to the control, orlistat, metformin and WT groups. Patients were given a diet and exercise program and one of either orlistat, metformin or WT for 12 weeks. At the end of the 12th week, the anthropometric and biochemical measurements were reassessed. Results: Body weight, waist circumference and BMI parameters decreased significantly in all groups. TNF-α, IL-6, IL-1β and MMP-9 levels decreased significantly in the WT group. In addition, contrary to a significant elevation in HDL-C, the serum cholesterol, LDL-C and TG levels decreased significantly. Furthermore, leptin, ghrelin and asprosin levels decreased significantly. Serum glucose levels decreased significantly in all groups except for the control. In the WT group, while there was a significant decrease in the levels of serum PL MDA and 8-OHdG, the opposite was true for GSH. Conclusions: The oral consumption of WT, its availability and its potency in obesity treatment and prevention pave the way for further delineation of the mechanisms of actions of its bioactive compounds at the cellular and endocrinological levels. Mon, 01 Jan 2024 00:00:00 GMT https://hdl.handle.net/11436/9725 2024-01-01T00:00:00Z https://hdl.handle.net/11436/9318 An inhibition potential on some metabolic enzymes (urease and xanthine oxidase), essential oil contents and antioxidant effect of Sideritis lanata L. Saral, Özlem; Baltaş, Nimet; Karaköse, Mustafa While people use the aerial parts of some Sideritis species as tea and sweetener, some species are used for medicinal purposes. In this study, anti-urease, anti-xanthine oxidase, and antioxidant activity of Sideritis lanata was determined together with the essential oil contents. The essential oil compositions were determined solid phase micro-extraction by GC/MS. The IC50 value of the current study was found to be 41.420 µg/mL for inhibition of urease and 33.725 µg/mL for inhibition of xanthine oxidase. A total of 22 components were identified in the essential oil analysis. Spathulenol (24.63%) and Pentadecanolide (18.95%) in Sideritis lanata were identified as the most abundant essential oil compounds whereas Valeric acid (3.45%) and Palmitic acid (1.84%) were found as a major fatty acid. In the methanol extract of the investigated plant, the obtained total phenol content was 6.18 ± 0.42 mg of GAE/g. DPPH and FRAP values were determined as 61.44 ± 0.52 µmol FeSO4/g and 0.61 ± 0.01 mg/ml, respectively. This study is important because it is the first one, which reports the determination of anti-urease and anti-xanthine oxidase activity for Sideritis lanata Mon, 01 Jan 2024 00:00:00 GMT https://hdl.handle.net/11436/9318 2024-01-01T00:00:00Z https://hdl.handle.net/11436/9308 Microplastics in honey from Türkiye: Occurrence, characteristic, human exposure, and risk assessment Başaran, Burhan; Özçifçi, Zehra; Kanbur, Esra Demir; Akçay, Hakkı Türker; Gül, Serkan; Bektaş, Yusuf; Aytan, Ülgen In this study, honey samples produced in Türkiye in 2023 were analyzed to assess occurrence of microplastics. The microplastics were physically and chemically characterised by stereomicroscope and FT-IR, respectively. Microplastic exposure by honey consumption was also calculated and risk assessment was done. The mean microplastic concentration was 314±353 (0–1280) particles/kg in 32 honey samples analyzed. The microplastics with four different polymers (EVA, PE, PP, and Nylon–6), two different shapes (fiber and fragment), and six different colors (black, brown, green, red, yellow, and transparent) were detected. The daily microplastic intake by consumption of monofloral and multifloral honey was calculated as 1.20 and 0.85 particles/day, respectively. The mean polymer hazard index and microplastic load index levels for all honey samples analyzed were 16.7±16 and 6.70±1.0, respectively. Result of this study confirmed that honey in Türkiye was contaminated with variety of microplastics. Considering to potential health risks of microplastics and associated chemicals to human health, production process should be improved by producers and urgent strategies and controls should be developed and applied by decision makers to eliminate the intake of microplastics through food. Mon, 01 Jan 2024 00:00:00 GMT https://hdl.handle.net/11436/9308 2024-01-01T00:00:00Z https://hdl.handle.net/11436/9283 The levels, single and multiple health risk assessment of 23 metals in enteral nutrition formulas Başaran, Burhan; Türk, Hülya Enteral nutrition formulas are products that provide macro and micronutrients to patients who cannot receive their nutrition orally. In this study, the levels of 23 metals known to have potential health risks were determined by inductively coupled plasma mass spectrometry in a total of 28 enteral nutrition formula. Metal exposure was calculated according to three different daily energy intake scenarios (Scenario 1 = 50% oral nutrition + 50% enteral nutrition formula, Scenario 2 = 25% oral nutrition + 75% enteral nutrition formula and Scenario 3 = 100% enteral nutrition formula) and evaluated in terms of non-carcinogenic health risks. The mean levels of Fe, Co, Ni, Cu, Zn, Mo, Se, Li, Be, V, As, Sr, Ag, Cd, Sb, Ba, La, Hg and Pb in the samples analyzed were determined 12,000 ± 3300, 64 ± 1.6, 10 ± 13, 1300 ± 400, 8500 ± 2500, 75 ± 30, 61 ± 21, 0.34 ± 0.36, 0.05 ± 0.08, 7.3 ± 2, 1.6 ± 0.6, 457 ± 166, 0.02 ± 0.1, 0.14 ± 0.12, 0.01 ± 0.1, 74 ± 103, 0.63 ± 0.4, 0.05 ± 0.03 and 0.14 ± 0.7 μg/L. These metals were considered safe in terms of non-carcinogenic health risks when analyzed individually. However, when the target hazard quotient values of all metals were evaluated together, hazard index values were higher than the reference value of 1, for both men and women, indicating potential health risks. Mon, 01 Jan 2024 00:00:00 GMT https://hdl.handle.net/11436/9283 2024-01-01T00:00:00Z