Overview
Beta-Hydroxybutyric Acid (β-HB) is one of three primary ketone bodies synthesized in the liver during fatty acid oxidation, particularly in fasting states or ketogenic conditions. It serves as an energy substrate for extrahepatic tissues, especially the brain during glucose scarcity. Biochemically, it's both a metabolic intermediate and biomarker, with clinical significance in diabetes and metabolic syndrome management. The compound exists as D- and L-isomers, with the D-form being biologically active. In industrial contexts, β-HB is synthesized for research reagents, diagnostic kits, and nutritional supplements. Its quantification in blood or urine is standard in ketosis monitoring, making it essential for medical and sports physiology applications.
Physical and Chemical Properties
β-HB is a short-chain hydroxy acid with a carboxyl group and hydroxyl group on the β-carbon. It exhibits typical carboxylic acid reactivity, forming salts (e.g., sodium β-hydroxybutyrate) for improved stability. The pure acid is hygroscopic and may dimerize in solution. Its pKa of 4.7 enables buffer capacity in physiological systems. Thermal decomposition occurs above 200°C, yielding acetoacetic acid and other byproducts. Spectroscopically, it shows characteristic IR absorption at ~1700 cm⁻¹ (C=O) and 3400 cm⁻¹ (O-H). Analytical detection typically employs enzymatic assays or GC/MS, with calibration standards requiring strict purity controls.
Main Applications
In clinical diagnostics, β-HB measurement differentiates diabetic ketoacidosis from other acid-base disorders. Point-of-care testing strips utilize β-hydroxybutyrate dehydrogenase for rapid quantification. Research applications include studies on ketogenic diets, neurodegenerative diseases (where ketones provide neuroprotection), and cancer metabolism. The supplement industry markets BHB salts as exogenous ketones for athletic performance enhancement. Industrial uses extend to chiral synthesis intermediates and biodegradable polymer precursors (PHB). Emerging applications involve metabolic therapy protocols, with pharmaceutical-grade β-HB formulations in development for epilepsy and mitochondrial disorder management.
Safety and Storage
As a mild organic acid, β-HB requires standard laboratory precautions: gloves, goggles, and ventilation when handling concentrated forms. Spills should be neutralized with bicarbonate and rinsed extensively. NFPA ratings include Health 2 (moderate hazard) and Reactivity 1 (slight). Long-term storage demands moisture-proof containers under inert gas to prevent oxidation. Lyophilized forms offer superior stability. Shipping regulations classify it as non-hazardous for small quantities, but bulk transport may require corrosive material labeling depending on carrier policies. Shelf life typically exceeds 2 years when stored correctly.
B2B Procurement Guide
Industrial buyers should specify: 1) Enantiomeric purity (D- vs. DL-mixture), 2) Analytical certification (HPLC/GC traces), 3) Packaging (amber glass vs. polymer bottles). Research-grade (≥99%) commands premium pricing, while technical-grade suffices for some industrial processes. Leading manufacturers include Sigma-Aldrich, TCI America, and domestic Chinese producers like Aladdin. MOQs vary from grams (research) to metric tons (industrial). Key due diligence points: batch-to-batch consistency testing, residual solvent analysis (if applicable), and compliance with USP/EP standards for medical applications. Container options range from 1kg bottles to 25kg drums.
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