Streamlined Vitamin D Metabolite Fingerprinting Analysis Using Isotope-Coded Multiplexing MS with Cost-Effective One-Pot Double Derivatization.

In this study, we extended a previously developed one-pot double derivatization reaction to establish the first routine isotope-coded multiplex derivatization for vitamin D and its metabolites for application in clinical environments, using commercial reagents, without the need for specialized reagents and advanced synthesis requirements. The original derivatization process consisted of using both a Cookson-type reagent and derivatization of hydroxyl groups. Initially, the analytes are derivatized by a Diels-Alder reaction using 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD), followed by acetylation using acetic anhydride, catalyzed by 4-dimethylaminopyridine at room temperature.

Prescribing beyond borders: Navigating challenges and opportunities in cross-border ePrescriptions for enhanced medication access and safety.

Background: The European cross-border electronic prescription (CBeP) was first introduced in Estonia and Finland. The CBeP service is gradually being implemented across Europe, prompting a need for practical studies to assess its benefits and potential shortcomings.

Objective: This study aimed to investigate Estonian and Finnish pharmacists' experiences with patient identification, personal data protection and safe use of medications with CBeP, as well as main advantages and areas of development of CBeP.

Tracking the Changes of DOM Composition, Transformation, and Cycling Mechanism Triggered by the Priming Effect: Insights from Incubation Experiments.

The priming effect (PE) is recognized as an important mechanism influencing organic matter transformation in aquatic systems. The land-ocean aquatic continuum (LOAC) has received large quantities of dissolved organic matter (DOM) from various sources, which is an ideal interface for PE research. Here, we investigated the PE process by utilizing such a coastal environment to explore the turnover of DOM in the LOAC system.

Measurement of Serum Free Vitamin D Concentrations: Importance, Challenges, and the Emerging Role of Mass Spectrometry.

Background: Serum total 25-hydroxyvitamin D [25(OH)D] concentration is the most widely used clinical biomarker for vitamin D status. Under certain physiological and pathological conditions, however, total 25(OH)D may not always be the best index for vitamin D status. Instead, the nonprotein-bound (free) fraction of total 25(OH)D has been suggested as a more appropriate marker in certain clinical situations.

Impact of Hydrothermal Fluids on Hydrocarbon Generation and Solid Bitumen Formation in the Kongdian Formation, Huanghua Depression, China.

Hydrothermal fluid plays a crucial role in the generation and migration of hydrocarbons within sedimentary basins. Herein, we employed bulk analysis and high-resolution mass spectrometry techniques to investigate the transformation dynamics from source rock to hydrocarbons under conditions influenced by magmatic activities in the Kongdian Formation, Huanghua Depression, China. The results revealed that hydrocarbon generation in the Ek shale of the study area was significantly influenced by abnormal heating from hydrothermal fluids.