Clinical / Bioanalysis

Why Blood Analysis Matters in Toxicology Investigations In forensic and clinical toxicology, blood is the gold standard matrix for assessing acute intoxication, therapeutic drug monitoring, and postmortem investigations. The concentration of drugs and their metabolites in whole blood or plasma directly correlates with pharmacological effects, making accurate quantification essential for legal and medical decisions. Solid-phase […]

SPE Preparation of Urine Samples for Drug Abuse Screening 1. Common Drugs of Abuse Detected in Urine Screening Urine drug screening is a cornerstone of toxicology laboratories, clinical diagnostics, and workplace testing programs. The most frequently targeted analytes include amphetamines, opiates (morphine, codeine, 6-acetylmorphine), cocaine metabolites (benzoylecgonine), cannabinoids (THC-COOH), benzodiazepines (oxazepam, lorazepam), and synthetic cathinones.

The Growing Demand for Therapeutic Drug Monitoring in Clinical Settings Therapeutic drug monitoring (TDM) has become an essential practice in modern hospitals, enabling clinicians to personalize drug dosages for improved efficacy and reduced toxicity. Drugs with narrow therapeutic windows—such as immunosuppressants (tacrolimus, cyclosporine), anticonvulsants (valproic acid, phenytoin), antibiotics (vancomycin, gentamicin), and antiretrovirals—require precise blood concentration

The Indispensable Role of SPE in Modern Forensic Toxicology Solid-phase extraction (SPE) has become a cornerstone technique in forensic toxicology laboratories worldwide. Its ability to selectively isolate target analytes from complex biological matrices—while removing interfering endogenous compounds—makes it essential for achieving the sensitivity, specificity, and reproducibility demanded by confirmatory analysis methods like LC-MS/MS and GC-MS.

Why Hormone Monitoring Matters in Clinical Diagnostics Endogenous hormones such as estradiol, testosterone, cortisol, and progesterone serve as critical biomarkers for a wide range of clinical conditions, including reproductive disorders, adrenal insufficiency, and certain cancers. Accurate quantitation at sub-nanogram-per-milliliter levels is essential for diagnosis, treatment monitoring, and research. Liquid chromatography–tandem mass spectrometry (LC-MS/MS) has become

WCX SPE for Isolation of Basic Metabolites in Human Urine 1. Characteristics of Basic Metabolites in Urine Samples Human urine is a complex biological matrix containing a wide variety of metabolites, including amino acids, amines, nucleosides, and many drug metabolites. Basic metabolites—those with pKa values typically above 7—are positively charged under physiological or slightly acidic

Introduction In pharmacokinetic (PK) studies, accurate quantification of drug concentrations in plasma is critical for understanding absorption, distribution, metabolism, and excretion (ADME) profiles. Plasma is a complex biological matrix containing proteins, lipids, salts, and endogenous compounds that can interfere with LC-MS/MS analysis. Effective sample preparation is therefore essential to remove matrix interferences, concentrate analytes, and

Using MAX SPE to Isolate Acidic Metabolites in Urine In pharmacokinetics and metabolomics, isolating acidic metabolites from complex biological matrices like urine is critical for accurate quantification and structural elucidation. Solid-phase extraction (SPE) with mixed-mode anion exchange sorbents, such as the Poseidon MAX SPE Cartridges, offers superior selectivity for acidic compounds. This article outlines a

Clinical Significance of Amino Acid Metabolite Profiling Amino acid metabolites serve as critical biomarkers for a range of metabolic disorders, including phenylketonuria, maple syrup urine disease, and homocystinuria. Their profiling in urine offers a non-invasive window into systemic metabolism, aiding early diagnosis and therapeutic monitoring. Solid-phase extraction (SPE) enables selective enrichment of these polar analytes

Applying WAX SPE for the Determination of Short-Chain Fatty Acids in Biological Samples Short-chain fatty acids (SCFAs), including acetate, propionate, and butyrate, are critical metabolites produced by gut microbiota and play key roles in host metabolism, immune regulation, and disease pathology. Accurate quantification of SCFAs in biological matrices such as serum and feces is essential