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Erythropoietin receptor agonists (ERAs) are substances prohibited in sports and currently monitored in urine and blood. There is a great interest in new matrices like dried blood spots (DBSs). A direct method for the detection of ERAs in DBSs using one single spot of 25 μl has been optimized and validated. Limits of detection close or equal to those required by the World Anti-Doping Agency for serum/plasma samples were achieved, using a volume 20-times lower. All analytes were stable for at least 90 days at room temperature. Method performance was comparable to the requirements established for blood samples and, thus, monitoring of ERAs is reliable in DBSs in the context of doping control.
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http://dx.doi.org/10.4155/bio-2023-0118 | DOI Listing |
Drug Test Anal
September 2025
Department of Laboratory Medicine, Karolinska Institute, Stockholm, Sweden.
Dried blood spots (DBS) have emerged as a promising complement, and in some settings, an alternative, to urine for anabolic androgenic steroid (AAS) testing, offering advantages such as minimal invasiveness, simplified storage, and transportation. This study evaluated two DBS collection devices-cellulose-based Capitainer-B50 and polymer-based Tasso-M20-and compared results with traditional urine analysis. Ten self-reported AAS users were recruited and provided matched urine and DBS samples.
View Article and Find Full Text PDFPLoS Med
September 2025
University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States of America.
Background: Oral emtricitabine/tenofovir disoproxil fumarate (F/TDF) preexposure prophylaxis (PrEP) effectiveness against HIV acquisition highly depends on adherence. For men who have sex with men, a dosing study in the United States (US) population defined clinically meaningful tenofovir diphosphate (TFV-DP) thresholds in dried blood spots (DBS) based on the rounded 25th percentile for 2, 4, and 7 doses/week as 350, 700, and 1,250 fmol/punch. However, divergent efficacy results in the first generation randomized clinical trials of F/TDF PrEP among African women led to several hypotheses to question whether the pharmacology and adherence requirement for oral F/TDF PrEP may be different in cisgender women compared to what is already established for men.
View Article and Find Full Text PDFJ Biomed Mater Res B Appl Biomater
September 2025
Fertility and Infertility Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran.
In the current in vitro experiment, we fabricated and characterized placenta/platelet-rich plasma (PL/Pt) composite scaffolds and evaluated their effect on differentiating adipose stem cells (ASCs) into insulin-producing cells (IPCs) in vitro. The human placenta (PL) was decellularized (dPL), characterized, and digested in pepsin. PRP was extracted using a two-step centrifugation process and then freeze-dried.
View Article and Find Full Text PDFJ Anim Sci
September 2025
University of Kentucky, Department of Plant and Soil Sciences, Lexington, KY 40506 USA.
Livestock grazing endophyte-infected (E+) tall fescue can exhibit persistent systemic vasoconstriction and fescue toxicosis. Isoflavones in legumes, most notably red clover (RC), are known hypotensive agents. The objective of the experiment was to evaluate the effect of isoflavone supplementation via RC hay, every day or every other day (QOD), on average daily gain (ADG) of steers grazing E+ tall fescue pastures and their physiological recovery after grazing when managed on a non-toxic diet (28-d).
View Article and Find Full Text PDFFood Res Int
November 2025
German Federal Institute for Risk Assessment (BfR), Department Food Safety, National Reference Laboratory for Animal Protein in Feed, Max-Dohrn-Str. 8-10, 10589 Berlin, Germany. Electronic address:
Processing food and feed sets off a variety of reactions (Maillard, (lipid) oxidation), which may be traced by covalent changes to e.g. proteins.
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