Hexacosanol vs Octacosanol vs Triacontanol: Why Just Two Carbon Atoms Can Change Melting Behavior, Formulation Performance and End-Use Applications
Conclusion first: Hexacosanol, Octacosanol and Triacontanol are neighboring straight-chain primary fatty alcohols, but they are not interchangeable. From C26 to C28 to C30, only two carbons are added at each step, yet molecular weight, lipophilicity and melting behavior rise—changing processing and formulation choices.
Same Functional Group, Different Chain Length
Hexacosanol is C26H54O, Octacosanol is C28H58O, and Triacontanol is C30H62O. Each step adds C2H4 and about 28 g/mol. PubChem gives molecular weights of about 382.7, 410.8 and 438.8 g/mol.
C26H54O → C28H58O → C30H62O
Constant: one terminal hydroxyl group. Changing: chain length, molecular weight, hydrophobic contribution and crystal packing.
Two Extra Carbons Shift Physical Behavior
Property
Hexacosanol
Octacosanol
Triacontanol
Carbon number
C26
C28
C30
CAS No.
506-52-5
557-61-9
593-50-0
Molecular weight
382.7
410.8
438.8 g/mol
PubChem XLogP3
12.7
13.8
14.9
Polar surface area
20.2 Ų
20.2 Ų
20.2 Ų
Representative TCI melting range*
78–81 °C
81–85 °C
85–90 °C
The useful pattern is directional: the –OH head remains unchanged while the hydrocarbon chain grows. PubChem XLogP3 rises from 12.7 to 14.9 while polar surface area stays at 20.2 Ų, showing increasing lipophilic character from C26 → C30.
*TCI values are representative grade specifications, not universal constants. Purity, homolog distribution and test method can shift an observed melting range.
Why This Matters in Formulation
Melting behavior affects melt incorporation, oil-phase dissolution and crystallization during cooling. Moving from C26 toward C30 may require a different thermal window or carrier system. In aqueous or semi-aqueous systems, particle size and emulsifier choice may matter as much as assay. Higher purity does not automatically mean easier formulation.
Different Molecules, Different Application Logic
Octacosanol is established as a nutritional/functional ingredient; Triacontanol is widely studied as a plant growth regulator; Hexacosanol is often evaluated as a homolog-specific high-carbon fatty alcohol. Their shared family does not imply the same formulation or qualification route.
What Buyers Should Compare Beyond Purity
Qualification logic: target-alcohol assay → homolog profile → GC method → melting range → source → residual controls → particle form → formulation compatibility → multi-batch consistency.
Because neighboring C26/C28/C30 homologs are chemically similar, buyers should confirm whether a percentage refers to the target monomer or a broader total alcohol fraction. A headline purity value cannot replace a clear GC profile.
Sifeng Bio's C26–C30 Platform
HUZHOU SIFENG BIOCHEM CO., LTD states that its platform covers C24–C34 fatty alcohol monomers and mixtures. It lists Octacosanol SF-002 from 10% to 90%, Triacontanol SF-003 at 90% and 95%, and Hexacosanol at 90% and 95%. For sourcing, homolog control and application fit matter more than asking which carbon number is “better.”
FAQ
What is the main difference between Hexacosanol, Octacosanol and Triacontanol?
Hexacosanol, Octacosanol and Triacontanol are C26, C28 and C30 linear primary fatty alcohols. Increasing chain length raises molecular weight, lipophilicity and, directionally, melting temperature.
How do Hexacosanol, Octacosanol and Triacontanol differ in melting behavior?
Representative TCI ranges are 78–81 °C for Hexacosanol, 81–85 °C for Octacosanol and 85–90 °C for Triacontanol. These are grade-specific ranges, not universal constants.
Are Hexacosanol, Octacosanol and Triacontanol interchangeable in formulations?
No. Hexacosanol, Octacosanol and Triacontanol differ in chain length, hydrophobicity and melting behavior, so solvent system, process temperature and dispersion strategy should be validated separately.
How should B2B buyers compare Hexacosanol, Octacosanol and Triacontanol quality?
Buyers comparing Hexacosanol, Octacosanol and Triacontanol should verify target-alcohol assay, homolog profile, GC method, melting range, residual controls and multi-batch consistency.
Sources & Verification
PubChem: Hexacosanol · Octacosanol · Triacontanol
TCI melting-point references: C26 · C28 · C30
NIST Chemistry WebBook: 1-Hexacosanol · Octacosanol
Comparing C26, C28 or C30?
Share target alcohol, assay, application, annual volume and destination market before sample qualification.
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