4-Hydroxy Valproic Acid Sodium Salt: Lab Handling & Usage Guide

4-Hydroxy Valproic Acid Sodium Salt is a hydroxylated metabolite of the widely used antiepileptic drug valproic acid, supplied as its sodium salt form (SKU H340463) for use as an analytical reference standard and research tool in valproate metabolism and pharmacokinetic studies.

Product SKU

H340463

Also Known As (Santa Cruz Reference)

sc-216870

Chemical Class

Hydroxylated fatty acid derivative; sodium salt

Primary Application

Analytical reference standard for valproic acid metabolite profiling

Parent Compound

Valproic Acid (2-propylpentanoic acid)

Metabolic Origin

Cytochrome P450-mediated omega-1 hydroxylation of valproic acid

Chemical Identity and Background

4-Hydroxy Valproic Acid Sodium Salt is a Phase I metabolite of valproic acid (VPA), one of the most prescribed antiepileptic and mood-stabilizing drugs. Valproic acid undergoes extensive hepatic biotransformation via cytochrome P450 enzymes (primarily CYP2C9 and CYP2A6) and mitochondrial beta-oxidation pathways, generating a complex array of metabolites. 4-Hydroxy valproic acid arises through omega-1 hydroxylation and is among the quantitatively significant urinary and plasma metabolites detected in patients receiving VPA therapy.

The sodium salt form improves aqueous solubility compared with the free acid, making it more convenient for preparation of stock solutions in physiological buffers. Aladdin Scientific supplies this compound under SKU H340463, cross-referenced to Santa Cruz catalog number sc-216870, providing researchers with a traceable reference material for metabolite identification and quantification workflows.

Recommended Handling and Storage

Reconstitution: Dissolve 4-Hydroxy Valproic Acid Sodium Salt in ultrapure water or aqueous physiological buffer (e.g., PBS, pH 7.4) to prepare stock solutions. Due to its sodium salt nature, the compound exhibits good aqueous solubility. Prepare working solutions fresh or aliquot and store at −20 °C to minimize degradation. Avoid repeated freeze-thaw cycles.

Storage conditions: Store the neat material in a tightly sealed container at −20 °C, protected from light and moisture. Confirm specific stability data from the certificate of analysis (CoA) supplied with each lot.

Handling precautions: Although 4-Hydroxy Valproic Acid Sodium Salt is a research reagent and not an active pharmaceutical ingredient in this context, standard good laboratory practice (GLP) should be observed. Wear appropriate personal protective equipment (PPE) including gloves, safety glasses, and lab coat. Avoid inhalation of dust. Handle in a well-ventilated area. Consult the Safety Data Sheet (SDS) for full hazard information before use.

Compatibility: Avoid strong oxidizing agents and extreme pH conditions that may cause degradation of the hydroxyl or carboxylate functional groups.

Research Applications and Assay Integration

Reference standard for LC-MS/MS metabolite profiling: 4-Hydroxy Valproic Acid Sodium Salt is primarily employed as an authentic reference standard in liquid chromatography-tandem mass spectrometry (LC-MS/MS) and gas chromatography-mass spectrometry (GC-MS) methods for the quantification of VPA metabolites in biological matrices such as plasma, urine, and liver microsomes. Verified reference standards are critical for accurate metabolite identification and calibration curve construction.

In vitro metabolism studies: The compound serves as a substrate or product standard in hepatic microsomal incubation assays, recombinant CYP enzyme activity assays, and hepatocyte-based metabolism experiments aimed at characterizing the biotransformation pathways of valproic acid.

Toxicology research: Several VPA metabolites have been implicated in drug-induced hepatotoxicity and teratogenicity. 4-Hydroxy valproic acid and related hydroxylated species are studied to distinguish metabolites contributing to pharmacological efficacy from those potentially involved in adverse effects.

Pharmacokinetic and bioanalytical method validation: Regulatory bioanalytical method validation (per FDA and EMA guidance) requires authentic reference materials for each analyte. H340463 can fulfill this role within validated methods designed to monitor VPA metabolic profiles in clinical or preclinical studies.

Quality and Specification Considerations

When procuring 4-Hydroxy Valproic Acid Sodium Salt for bioanalytical or pharmacological research, the following quality parameters should be reviewed on the lot-specific Certificate of Analysis (CoA):

• Purity: For reference standard applications, high chemical purity (≥95% by HPLC or NMR) is strongly recommended to minimize interference in quantitative assays.
• Identity confirmation: Verify by at least one orthogonal technique such as NMR spectroscopy or high-resolution mass spectrometry (HRMS).
• Water content: As a sodium salt that may be hygroscopic, water content (Karl Fischer titration) should be evaluated, especially when preparing gravimetric stock solutions.
• Counterion content: Confirm sodium salt stoichiometry if exact molecular weight is critical for molar concentration calculations.

Aladdin Scientific cross-references this product to sc-216870 (Santa Cruz Biotechnology), enabling researchers to align findings with published literature that may reference either catalog number. Always cite the specific lot number and supplier in publications to ensure reproducibility.

Regulatory and Safety Compliance

4-Hydroxy Valproic Acid Sodium Salt is supplied strictly for research use only (RUO) and is not intended for diagnostic, therapeutic, or human/veterinary use. Researchers must comply with all applicable institutional, national, and international regulations governing the use of chemical substances in laboratory research.

Prior to use, all laboratory personnel must consult the product's Safety Data Sheet (SDS). Standard chemical laboratory precautions apply: use of fume hoods where appropriate, proper disposal of chemical waste in accordance with local regulations, and documentation of chemical inventory in compliance with institutional chemical hygiene plans.

Shipment and storage must adhere to the conditions specified on the product label and CoA. If in doubt about compatibility with specific assay systems or regulatory requirements, contact Aladdin Scientific technical support for guidance.

Frequently asked questions

What is 4-Hydroxy Valproic Acid Sodium Salt used for in research?

4-Hydroxy Valproic Acid Sodium Salt (H340463) is primarily used as an authentic analytical reference standard in LC-MS/MS and GC-MS methods for quantifying valproic acid metabolites in biological samples. It is also employed in in vitro hepatic metabolism assays, CYP enzyme activity studies, and pharmacokinetic method validation workflows.

How should I dissolve and store 4-Hydroxy Valproic Acid Sodium Salt?

Dissolve the compound in ultrapure water or an aqueous physiological buffer (e.g., PBS, pH 7.4), taking advantage of the enhanced aqueous solubility of the sodium salt form. Aliquot stock solutions and store at −20 °C protected from light; avoid repeated freeze-thaw cycles. Store the neat solid in a tightly sealed container at −20 °C. Confirm lot-specific stability recommendations on the Certificate of Analysis.

What purity grade is recommended for use as a bioanalytical reference standard?

For bioanalytical and quantitative LC-MS/MS applications, a minimum purity of ≥95% (as determined by HPLC or NMR) is strongly recommended. Identity should ideally be confirmed by an orthogonal technique such as high-resolution mass spectrometry (HRMS) or NMR spectroscopy. Always review the lot-specific CoA provided with H340463 for actual purity and identity data before use.

Is 4-Hydroxy Valproic Acid Sodium Salt the same compound as sc-216870 from Santa Cruz?

Yes. Aladdin Scientific's H340463 is cross-referenced to Santa Cruz Biotechnology catalog number sc-216870, meaning both refer to the same chemical entity: the sodium salt of 4-hydroxy valproic acid. Researchers can use either catalog number when comparing with published literature, but should always report the specific supplier and lot number in publications for reproducibility.

Can this compound be used for diagnostic or therapeutic purposes?

No. 4-Hydroxy Valproic Acid Sodium Salt (H340463) is supplied for research use only (RUO) and must not be used for diagnostic, therapeutic, clinical, or veterinary purposes. Use must comply with all applicable institutional and regulatory requirements governing research chemicals.

References

1. Klotz U, Antonin KH. Pharmacokinetics and bioavailability of sodium valproate. Clinical Pharmacokinetics. General textbook-level reference on VPA metabolism pathways including hydroxylation metabolites.
2. Loscher W. Pharmacology of valproate: new aspects of mechanisms of action relevant to antiepileptic activity and drug interactions. Pharmacology & Toxicology. General reference on VPA biotransformation.
3. Santa Cruz Biotechnology. Product data sheet for sc-216870: 4-Hydroxy Valproic Acid Sodium Salt. [Supplier document].

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.