Pentacosane TCI P0139

Chemical Identity

CAS No.: 629-99-2
PubChem: CID 12406·SID 87574392
Formula: C25H52
Molecular weight: 352.7 g/mol
Purity: >97.0%(GC)
Reference databases: ChEBI·ChemSpider·ECHA

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: pentacosane
SMILES: CCCCCCCCCCCCCCCCCCCCCCCCC
InChIKey: YKNWIILGEFFOPE-UHFFFAOYSA-N

Rp 1.803.900,00

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Pentacosane from TCI is a saturated straight-chain alkane with twenty-five carbon atoms. It belongs to the heavy paraffin hydrocarbons and has a waxy texture at room temperature. In the laboratory it is widely used as a reference standard in gas chromatography, especially for determining retention indices and identifying hydrocarbons in complex samples. The compound also occurs naturally in insect cuticular hydrocarbons and in plant wax layers, which makes it an important material for chemical ecology research and for studies of natural hydrocarbon profiles.

Researchers choose this material because its structure is simple, it has no functional groups, and it is chemically very inert. This makes it stable as a standard and unlikely to react with the sample matrix during preparation or analysis. Its long, straight carbon chain gives the typical alkane fragmentation pattern in mass spectrometry, and its retention time is easy to predict within a homologous series. These features make results easier to interpret and compare between runs. Its paraffinic nature is also of interest for research on phase-change materials for thermal energy storage.

In Indonesia, pentacosane is useful for entomology and chemical ecology laboratories that study insect cuticular hydrocarbons and chemical signalling. It also supports laboratories that analyse essential oils and plant waxes, environmental chemistry groups that monitor hydrocarbons in environmental samples, and petroleum geochemistry laboratories that analyse alkane biomarkers. Universities, research institutes, and industrial quality control laboratories can use it as a dependable reference compound in routine analysis and in method development.

Related TCI products

Gas chromatography retention index work: a single, well-defined straight-chain alkane with a predictable retention time in the homologous series makes it a good reference point for calculating retention indices.
Hydrocarbon identification in complex samples: its typical alkane fragmentation pattern in mass spectrometry helps analysts confirm and assign peaks of heavy paraffins in mixed hydrocarbon profiles.
Chemical ecology and entomology research: pentacosane is a known component of insect cuticular hydrocarbons, so it serves as an authentic reference when characterising insect surface chemistry and chemical signals.
Plant wax and essential oil analysis: as a compound found in plant wax layers, it helps laboratories identify and compare long-chain alkanes in plant extracts.
Petroleum geochemistry and phase-change material research: its inert paraffinic structure suits alkane biomarker analysis, and its waxy paraffin character makes it relevant to studies of heat-storing phase-change materials.

Brand	TCI (product code P0139)
CAS number	629-99-2
Molecular formula	—
Purity	—
Category	Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Pack sizes	1g and 5g
Physical form	waxy solid at room temperature (saturated straight-chain C25 alkane)
Storage	keep tightly closed in a cool, dry place; follow the manufacturer's label and safety data sheet

Store pentacosane in its original, tightly closed container in a cool, dry, well-ventilated area, away from direct sunlight, heat sources, and strong oxidising agents. Glass or other chemically compatible containers with secure caps help keep the material clean and protect its value as an analytical standard. Use clean spatulas and glassware to avoid contaminating the material with other hydrocarbons, because even small amounts of contamination can affect chromatographic results. Follow standard laboratory practice: wear gloves, safety glasses, and a lab coat, avoid creating dust or breathing it in, and wash hands after handling. Always check the manufacturer's safety data sheet for detailed hazard and disposal information.

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