Methyl Hexacosanoate: Properties, Handling & Lab Use Guide

Methyl hexacosanoate is a long-chain saturated fatty acid methyl ester derived from cerotic acid (C26:0) that serves as a critical reference standard in gas chromatographic profiling of very-long-chain fatty acids in biological and food matrices.

Chemical Name

Methyl hexacosanoate (Cerotic acid methyl ester)

Molecular Formula

C27H54O2

Molecular Weight

410.72 g/mol

CAS Number

2681-00-7

Appearance

White to off-white solid wax at room temperature

Recommended Storage

Store at 2–8 °C, away from light and moisture

Primary Application

GC/MS fatty acid methyl ester (FAME) profiling reference standard

Chemical Identity and Physical Properties

Methyl hexacosanoate, also known as cerotic acid methyl ester, is the methyl ester of hexacosanoic acid (cerotic acid, C26:0). It belongs to the very-long-chain fatty acid methyl ester (VLCFA-ME) class, with the systematic IUPAC name methyl hexacosanoate and CAS number 2681-00-7. Its molecular formula is C₂₇H₅₄O₂ with a molecular weight of approximately 410.72 g/mol.

At ambient laboratory conditions, the compound presents as a white to off-white waxy solid. Its high carbon chain length (C26) confers a relatively high melting point compared with shorter-chain FAMEs, a property that must be accounted for when preparing working solutions. The compound is practically insoluble in water but dissolves readily in organic solvents such as chloroform, hexane, and dichloromethane, which are the recommended vehicles for stock solution preparation.

Analytical Applications in Lipid Research

Methyl hexacosanoate is primarily employed as a certified or working reference standard in fatty acid methyl ester (FAME) profiling by gas chromatography (GC) and gas chromatography–mass spectrometry (GC/MS). Very-long-chain fatty acids (VLCFAs, chain length ≥C22) including C26:0 are of significant biological relevance; elevated plasma levels of C26:0 are a diagnostic biomarker for peroxisomal disorders such as X-linked adrenoleukodystrophy (X-ALD) and Zellweger spectrum disorders.

In food science, methyl hexacosanoate appears in the FAME profiles of waxes, plant cuticular lipids, and certain vegetable oils, where accurate quantification requires well-characterized reference materials. Researchers also use it as a retention-time marker to calibrate capillary GC columns and to establish Kovats retention indices for very-long-chain FAME series. In lipidomic workflows, it may serve as an internal or external calibration standard when analysing complex biological extracts from plasma, tissue, or cell cultures.

Storage, Handling and Safety Guidelines

Storage: Store methyl hexacosanoate at 2–8 °C in a tightly sealed container, protected from light and moisture. Because it is a solid wax at room temperature, brief warming (e.g., to 40–50 °C in a water bath) may be required to fully dissolve the compound in solvent before use. Aliquot stock solutions to minimise freeze-thaw cycles and solvent evaporation.

Handling: Work in a well-ventilated laboratory or fume hood when preparing solutions in volatile organic solvents (hexane, chloroform, DCM). Wear appropriate personal protective equipment (PPE) including nitrile gloves, safety glasses, and a laboratory coat. Methyl hexacosanoate itself presents a low acute-hazard profile as a saturated ester; however, the solvents used for dissolution carry their own hazard classifications and must be handled according to their respective Safety Data Sheets (SDS).

Waste Disposal: Dispose of solvent-containing waste in accordance with local regulations for halogenated or non-halogenated organic solvent waste, as appropriate to the solvent used.

Preparation of Working Solutions and Quality Considerations

Stock Solution Preparation: Accurately weigh the required amount of methyl hexacosanoate using an analytical balance. Dissolve in a suitable organic solvent (typically hexane or chloroform) by gentle warming if necessary, then adjust to the target volume in a calibrated volumetric flask. Typical stock concentrations for GC reference standards range from 0.1 to 1 mg/mL; verify with your specific assay requirements.

Purity and Traceability: For quantitative analytical work, use reagent-grade or higher purity material with documented lot-specific purity certificates. The Aladdin Scientific product (SKU M432979) should be accompanied by a Certificate of Analysis (CoA) stating the purity, lot number, and any spectral data. Always consult the CoA before use and confirm that purity meets your assay acceptance criteria.

Stability: Solutions of methyl hexacosanoate in organic solvents are generally stable when stored at –20 °C under inert atmosphere (e.g., nitrogen or argon headspace). Avoid repeated exposure to air, which can cause slow oxidative degradation of the solvent matrix over time, potentially affecting trace-level quantification.

Frequently asked questions

What solvents are recommended for dissolving methyl hexacosanoate?

Methyl hexacosanoate dissolves readily in non-polar to moderately polar organic solvents. Hexane and chloroform are the most commonly used vehicles for preparing GC reference standard solutions. Dichloromethane (DCM) is also suitable. The compound is practically insoluble in water and short-chain alcohols alone; mild warming (40–50 °C) may be required to achieve complete dissolution at higher concentrations.

Why is methyl hexacosanoate used as a GC reference standard rather than the free acid?

Fatty acid methyl esters are more volatile and thermally stable than their corresponding free fatty acids, making them far better suited for GC analysis. The methyl ester form produces sharper, more reproducible chromatographic peaks, reduces column bleed, and avoids the tailing and adsorption problems associated with free carboxylic acids on GC stationary phases. FAME derivatisation is therefore the universally accepted sample preparation approach for fatty acid profiling by GC.

What is the biological significance of hexacosanoic acid (C26:0)?

Hexacosanoic acid (C26:0) is a very-long-chain saturated fatty acid that is normally degraded within peroxisomes via beta-oxidation. In patients with peroxisomal biogenesis disorders such as X-linked adrenoleukodystrophy (X-ALD) or Zellweger syndrome, this pathway is impaired, leading to abnormal accumulation of C26:0 in plasma and tissues. Measurement of plasma C26:0 levels, typically as its methyl ester by GC/MS, is therefore a standard diagnostic test for these conditions.

How should I verify the identity and purity of methyl hexacosanoate before use?

Always consult the Certificate of Analysis (CoA) provided with each lot of M432979, which should document purity (typically by GC area percent), appearance, and lot-specific data. Identity confirmation can be performed by GC/MS comparison against published mass spectral libraries (e.g., NIST), or by comparison of retention time against a certified reference material. If independent verification is required, NMR or high-resolution MS can provide structural confirmation.

References

1. Moser, H. W. et al. X-linked adrenoleukodystrophy. Nature Reviews Disease Primers, 2016. [Review of C26:0 as diagnostic biomarker — verify full citation details]
2. Christie, W. W. Preparation of fatty acid methyl esters. AOCS Lipid Library. [Standard reference for FAME preparation methodology — verify URL and date]
3. NIST Chemistry WebBook: Methyl hexacosanoate mass spectral data. National Institute of Standards and Technology. [Confirm CAS 2681-00-7 entry]

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