Tetratriacontanol

Tetratriacontanol (1-Tetratriacontanol)

1. Identity: Chemical and Botanical Profile

Chemical Names and Identifiers

1-Tetratriacontanol is also known by the synonyms tetratriacontyl alcohol, sapiol, and geddyl alcohol, and carries the CAS Registry Number 28484-70-0. Its molecular formula is C₃₄H₇₀O and it is catalogued in the NIH PubChem database as Compound Identifier (CID) 185639.

Tetratriacontanol is a member of the very-long-chain fatty alcohol (VLCFA) family — saturated, straight-chain, primary monohydric alcohols characterized by an unbranched carbon backbone terminating in a hydroxyl (–OH) group. The policosanol family, of which tetratriacontanol is the longest-chain member at C34, comprises a mixture of molecules with carbon chains ranging from 24 to 34 carbons, encompassing tetratriacontanol (C34), dotriacontanol (C32), triacontanol (C30), nonacosanol (C29), octacosanol (C28), heptacosanol (C27), hexacosanol (C26), and tetracosanol (C24).

Tetratriacontanol is a white waxy solid that is insoluble in water but soluble in organic solvents. This physical characteristic — shared by other members of the policosanol series — has significant implications for its extraction, formulation, and bioavailability. Policosanol as a class is obtained from plant waxes and beeswax as a solid waxy substance, insoluble in water but soluble in organic solvents.

Natural Sources

Tetratriacontanol is found naturally in various sources, including plant waxes, bee waxes, and some animal fats. Within the broader policosanol matrix, it consistently appears as a minor component across multiple botanical and insect-derived sources.

Sugarcane (Saccharum officinarum L.): Policosanol is a general name given to the blend of long-chain alcohols extracted from plant waxes after saponification; it is a combination of aliphatic alcohols with 24–34 carbon atoms purified from sugarcane wax, with the main components being octacosanol, triacontanol, dotriacontanol, hexacosanol, and tetratriacontanol. Other alcohols — namely tetracosanol, heptacosanol, nonacosanol, dotriacontanol, and tetratriacontanol — are minor components of Cuban sugarcane policosanol.

Beeswax: When long-chain alcohols are isolated from beeswax by lipase-catalyzed methanolysis in supercritical carbon dioxide, they are found in the following percentages: tetracosanol, 9.1%; hexacosanol, 14.0%; octacosanol, 18.4%; triacontanol, 37.2%; dotriacontanol, 21.1%; and tetratriacontanol, 0.3%. Tetratriacontanol is therefore present in beeswax at trace levels relative to other alcohols in the mixture. Beeswax alcohol (BWA), a substance purified from beeswax, contains a mixture of six primary aliphatic alcohols (C24, C26, C28, C30, C32, and C34).

Rice (Oryza sativa) hulls and bran: An ethyl acetate extract of Oryza sativa (rice) hulls yielded seven compounds including 1-tetratriacontanol; the structures were elucidated with 500 MHz NMR using 1D and 2D spectral methods, aided by electron ionization mass spectrometry, fast atom bombardment mass spectrometry, infrared, and ultraviolet spectrophotometry. Hentriacontane, 1-tetratriacontanol, and β-sitosterol-3-O-β-d-glucoside were identified for the first time in rice hulls in that 2005 study. Tetratriacontanol (C34) was also found in at least one of the commercially analyzed rice bran cooking oils.

Other plant sources: Policosanol is a long-chain aliphatic alcohol compound that is rare in its free state but commonly abundant in the form of long-chain aliphatic acid esters; it can be extracted from rice bran, sugarcane, germ, maize, beeswax, apples, grapes, etc. Tetratriacontanol, as the C34 terminus of this series, has been detected across most of these matrices where analytical methods of sufficient sensitivity have been applied. Major natural sources of policosanols are sugarcane and rice bran, but also beeswax and wheat germ.

Relationship to Policosanol and the Fatty Alcohol Series

Pure policosanol exists as a white powder or scaly crystal and is a mixture of molecules with carbon chains ranging in length from 24 to 34 carbons, known as tetratriacontanol (C-34), dotriacontanol (C-32), triacontanol (C-30), nonacosanol (C-29), octacosanol (C-28), heptacosanol (C-27), and others. Policosanol is a kind of long-chain fatty acid alcohol including octacosanol (C28H57OH, the most abundant component), tetracosanol (C24H49OH), triacontanol (C30H61OH), and tetratriacontanol (C34H69OH), and has been considered a functional food with hypolipidemic, antiobesity, antihypercholesterolemia, and antihypolipidemic activity. The proportion of tetratriacontanol can vary markedly depending on source: one studied policosanol formulation contained 28% octacosanol, 21% triacontanol, and 36% tetratriacontanol.

2. Traditional and Historical Use

Context Within the Policosanol Tradition

Tetratriacontanol as an isolated, individually named compound does not have a discrete history of traditional use pre-dating modern analytical chemistry. Its historical record is inseparable from that of the broader class of wax-derived fatty alcohols from which it is extracted. The relevant traditional and early modern history centers on two related phenomena: the agricultural use of long-chain alcohols as plant-growth agents, and the incorporation of wax-containing botanical preparations in traditional medicine.

Agricultural tradition — alfalfa wax: The earliest documented scientific isolation of a closely related long-chain alcohol, 1-triacontanol (C30), was performed in 1933. Triacontanol was first isolated in 1933 from alfalfa wax and was identified as a saturated straight-chain primary alcohol. This isolation — from Medicago sativa (lucerne) — was the first demonstration that plant epicuticular waxes harbored biologically significant long-chain alcohol fractions. Tetratriacontanol, as the C34 congener, would have been co-present in those early preparations, though not individually identified at the time.

Asian agricultural application of long-chain alcohols: Triacontanol (TRIA), the closely related C30 alcohol, is a natural plant growth regulator found in epicuticular waxes and has been used to enhance crop production across millions of hectares, particularly in Asia. Extracts of alfalfa, sugarcane wax, and rice bran wax — all matrices that contain tetratriacontanol as a component — have been used in Asian agriculture for decades as crop-yield enhancers.

Sugarcane-derived preparations: The use of policosanol as a dietary supplement originated in Cuba in the 1990s. The Cuban research group that holds the patent on sugarcane-derived policosanol published approximately eighty double-blind studies on its product, enrolling several thousand people with elevated cholesterol levels in clinical trials ranging in length from six weeks to twelve months, in virtually every one of which policosanol proved both more effective than placebo and just as effective as statin drugs. Tetratriacontanol was a minor but consistently present component within this body of investigation. Policosanol has been widely used in the fields of dietary food supplements, food additives, cosmetics, pharmaceuticals, and animal feed additives.

Beeswax alcohol tradition: Beeswax alcohol — a mixture of C24–C34 alcohols including tetratriacontanol — has been registered as a functional food ingredient for joint and gastrointestinal health in Korean health functional foods by the Korean Food and Drug Administration (KFDA).

3. Key Constituents, Active Compounds, and Mechanisms of Action

Chemical Context

Tetratriacontanol is itself one of the active constituents rather than a complex mixture. As the longest-carbon-chain member of the policosanol series, it is a fully saturated, linear, primary alcohol with 34 carbon atoms and a single terminal hydroxyl group. It is a regular monohydric primary alcohol that is rare in its free state but commonly abundant in the form of long-chain aliphatic acid esters. In natural matrices, extraction by saponification of wax esters releases it as the free alcohol. Approximately 40% of beeswax is long-chain esters which can be transesterified to give these alcohols and fatty acid methyl esters.

Mechanisms of Action Attributed to the Policosanol Series

Scientific evidence regarding the specific mechanism of action of tetratriacontanol individually is absent from the published literature; mechanisms have been studied for the policosanol mixture and, most extensively, for its dominant component octacosanol (C28). The following mechanisms have been attributed to the class, and tetratriacontanol is presumed to share structural and thus pharmacological properties with its congeners.

• Modulation of cholesterol biosynthesis: There is evidence from in vitro studies that policosanol may inhibit hepatic cholesterol synthesis at a step before mevalonate generation, but direct inhibition of hydroxy-methylglutaryl–coenzyme A (HMG-CoA) reductase is unlikely. Proposed mechanisms of action of policosanol include modulation of HMG-CoA reductase and inhibition of bile acid absorption.
• LDL receptor upregulation: Since decreased cholesterol biosynthesis is associated with increased LDL-receptor expression in hepatocytes, the effects of sugarcane policosanol on serum LDL-C can be suggested as originating from increased LDL-binding, uptake or degradation, as demonstrated in studies measuring radiolabeled LDL on the surface of human fibroblasts.
• Antiplatelet and thromboxane modulation: Policosanol decreases levels of thromboxane A2 and may increase levels of prostacycline. Policosanol also inhibits platelet aggregation and lipid peroxidation in both experimental models and humans.
• Antioxidant properties: Beeswax alcohol (BWA), which consists of a blend of long-chain aliphatic alcohols of C24 to C34 including tetratriacontanol, is renowned for its potent antioxidant and anti-inflammatory activities; its impact on the prevention of LDL oxidation and the functionality enhancement of HDLs via augmenting HDL-associated paraoxonase (PON)-1 activity has been described.
• Fatty acid beta-oxidation metabolism: Octacosanol metabolism is linked to fatty acid metabolism via β-oxidation. It is presumed, though not independently confirmed for tetratriacontanol specifically, that longer-chain congeners follow analogous metabolic pathways.
• Gut microbiota interaction: A large amount of evidence has shown that policosanol improves hypertriglyceridemia and hypercholesterolemia in humans and animals and has the potential as a functional food to improve obesity.

Pharmacokinetics

Pharmacokinetic data in humans are unpublished except for one study that used tritiated octacosanol, where only total radioactivity was measured; there is therefore no certainty that significant amounts of the intact aliphatic alcohols are absorbed from the intestinal tract and are available for human tissues. This represents a fundamental knowledge gap for the entire policosanol class, including tetratriacontanol. The compound's high molecular weight, waxy physical form, and water insolubility make oral absorption challenging, and formulation strategies (e.g., emulsification, lipid-based delivery) may substantially influence bioavailability, though this has not been formally investigated for tetratriacontanol in isolation.

4. Scientific Evidence by Area of Use

4.1 Cardiovascular: Lipid Lowering and Cholesterol Management

The preponderance of clinical research on the policosanol class — the mixture in which tetratriacontanol is a minor constituent — concerns its lipid-lowering properties. This evidence must be carefully contextualized with respect to source, study independence, and replication.

Cuban clinical trial evidence (positive findings): At doses of 10 to 20 mg per day of policosanol, a review of Cuban placebo-controlled studies found that the mixture lowered total cholesterol by 17% to 21% and LDL cholesterol by 21% to 29% and raised HDL cholesterol by 8% to 15%; however, data on efficacy as determined by clinical endpoints such as rates of cardiac events or cardiac mortality are lacking. A double-blind, placebo-controlled study of 56 patients with primary hypercholesterolemia found that after adhering to a cholesterol-lowering diet for 6 weeks, patients were randomized to receive placebo or policosanol 5 mg once daily in the evening for 8 weeks; total cholesterol and LDL cholesterol decreased significantly by an average of 13.1% and 17.7%, respectively, with no significant changes in triglycerides, VLDL cholesterol, or HDL cholesterol.

Limitations of Cuban research: Published studies have come to conflicting conclusions regarding the efficacy of policosanol in lowering LDL or raising HDL, despite a number of studies funded by the Cuban government, which produces and markets the drug. The evidence on policosanol is inconclusive.

Independent clinical trials (negative and null findings): The use of policosanol to treat elevated cholesterol was based on clinical trials conducted in Cuba that showed sugarcane-derived policosanol to be similar in efficacy to statins; however, in a double-blind, randomized controlled trial, healthy adults with mild hypercholesterolemia (n = 40) were assigned to receive oral policosanol (20 mg) or placebo once daily for 8 weeks, and no significant differences in the change in LDL cholesterol were observed between groups, nor were any significant changes in total cholesterol, HDL cholesterol, triacylglycerol, or C-reactive protein. The conclusion was that policosanol does not alter the serum lipid profile over an 8-week period in adults with mild hypercholesterolemia.

The first truly independent trials of policosanol as a treatment for high cholesterol began to appear in 2006; a small double-blind trial found marginal evidence that policosanol might enhance sports performance. While initial clinical trials primarily conducted by a Cuban research group indicated positive outcomes, subsequent independent studies have raised significant doubts about its effectiveness in lowering cholesterol.

More recent positive independent evidence: A placebo-controlled, randomized, double-blinded human trial evaluated the efficacy and safety of 20 mg of Cuban policosanol in blood pressure and lipid/lipoprotein parameters of healthy Japanese subjects; after 12 weeks of consumption, the policosanol group showed significantly lower blood pressure, glycated hemoglobin (HbA1c), and blood urea nitrogen (BUN) levels.

Overall evidence assessment: The evidence for the lipid-lowering efficacy of the policosanol mixture — which includes tetratriacontanol as a minor component — is mixed and contested. Cuban-origin studies consistently report efficacy, but independent replication from non-Cuban groups has repeatedly failed to confirm these results, and the evidence has been characterized as inconclusive. Tetratriacontanol has never been tested in isolation for lipid effects in human clinical trials.

4.2 Cardiovascular: Platelet Aggregation and Intermittent Claudication

In both clinical and animal studies, policosanol has been shown to significantly reduce levels of LDL cholesterol and total cholesterol while increasing HDL cholesterol; policosanol also has favorable effects on intermittent claudication, possibly due to its effects on platelet aggregation and endothelial function. Multiple trials, all published by the same authors, suggest a role for policosanol in intermittent claudication and platelet aggregation inhibition; in a 10-week, randomized, comparative study, policosanol 10 mg/day increased the initial and absolute claudication distances in patients with intermittent claudication. Independent validation of these trials is needed. The role of tetratriacontanol specifically in this effect has not been studied.

4.3 Antioxidant and Hepatoprotective Activity

Beeswax alcohol — the C24–C34 fatty alcohol mixture including tetratriacontanol — is a natural product used for its antioxidant properties; in one study, zebrafish were exposed to ethanol with supplementation of beeswax alcohol or mixtures, and supplementation increased survival rate dramatically without affecting body weight, with histological examination showing that alcoholic foamy degeneration in hepatic tissue was ameliorated by beeswax alcohol supplementation. Staining studies suggested that the mixed supplement decreased hepatic reactive oxygen species (ROS) production and interleukin-6 expression owing to enhanced antioxidant properties, and improved alcohol-induced dyslipidemia and oxidative stress. These are animal model data and cannot be directly extrapolated to humans.

4.4 Plant Biological Activity

Unlike its close congener triacontanol (C30), tetratriacontanol has not been documented as a plant growth regulator in its own right. When tested in rice hull phytochemical studies, 1-tetratriacontanol and β-sitosterol-3-O-β-d-glucoside showed about 13–20% inhibitory activity against duckweed (Lemna paucicostata) based on chlorophyll reduction. This inhibitory effect contrasted with the well-documented growth-promoting activity of its shorter-chain congener triacontanol.

4.5 Metabolic and Antidiabetic Context

Policosanol — including tetratriacontanol as a component — has been considered a functional food with hypolipidemic, antiobesity, antihypercholesterolemia, and antihypolipidemic activity and has been used as a potential adjuvant drug for type 2 diabetes mellitus over the past two decades. Previous studies indicated that policosanol has a wide variety of biological functions including a lipid-lowering effect and prevention of type II hypercholesterolemia, type II diabetes, and oxidative damage. No clinical trials have isolated tetratriacontanol's contribution to these effects.

5. Body Systems and Health Areas Associated with Tetratriacontanol

As a minor component of policosanol, tetratriacontanol is associated with the same body systems studied for the mixture as a whole:

• Cardiovascular system: Clinical trials indicate that policosanol may have applications in the treatment of familial (type II) and diabetes-related hypercholesterolemia, as well as intermittent claudication.
• Hepatic system: Policosanol does not adversely affect the liver based on surveillance data, and beeswax alcohol preparations including tetratriacontanol have been studied for hepatoprotection in zebrafish models.
• Hematological system: Policosanol can slow blood clotting and might increase the chance of bleeding in people with bleeding disorders — an antiplatelet action shared by the class.
• Metabolic system: Blood glucose regulation, HbA1c modulation, and lipid metabolism have been reported in human trials of policosanol mixtures containing tetratriacontanol.
• Agricultural/plant physiology: Tetratriacontanol shows mild herbicidal activity in in vitro plant models, distinct from the growth-promoting properties of triacontanol.

6. Dosage Forms and Reported Dosages

Tetratriacontanol is not sold or administered as a standalone supplement; it is encountered exclusively as a component of policosanol preparations. Dosage information from published studies therefore relates to the mixture:

• In a double-blind, placebo-controlled study in patients with primary hypercholesterolemia, the dose used was policosanol 5 mg once daily in the evening for 8 weeks.
• In a North American randomized controlled trial, healthy adults with mild hypercholesterolemia received oral policosanol 20 mg or placebo once daily for 8 weeks.
• A double-blind experiment on volunteers with prehypertension used orally administered 10 mg policosanol tablets (containing 60–70% octacosanol) each day.
• A Japanese randomized, placebo-controlled, double-blind trial evaluated 20 mg of Cuban policosanol per day.
• At doses of 10 to 20 mg per day (of the policosanol mixture), Cuban clinical literature reported that total cholesterol was lowered by 17% to 21% and LDL cholesterol by 21% to 29%.
• Moderate decreases in plasma cholesterol levels were measured in hypercholesterolemic patients taking 5–25 mg of policosanols per day in several clinical reports.

Because the proportion of tetratriacontanol in any given policosanol preparation varies by source, the effective dose of tetratriacontanol in any of these studies is not calculable from published data. In sugarcane-derived policosanol, 1-tetratriacontanol constitutes less than 5% of the mixture. This implies that in a 10 mg dose of Cuban sugarcane policosanol, the tetratriacontanol content is likely below 0.5 mg.

7. Safety Considerations and Interactions

General Tolerability of the Policosanol Class

Policosanol was generally well tolerated in human trials, with adverse reactions including rash, fatigue, headache, weight loss, excess urination, and insomnia; a surveillance study of 2,252 elderly patients taking policosanol supplementation found long-term tolerability with the supplements. A safety study of 27,879 people followed for 2 to 4 years showed that use of policosanol produced adverse effects in only 0.31% of participants, primarily weight loss, excessive urination, and insomnia.

In animal studies, no toxic signs were seen even at 620 times the maximum recommended dose.

Antiplatelet Interactions

Because of its effects on platelet adhesiveness, policosanol can have additive effects with all anticoagulant and antiplatelet medications. Policosanol might slow blood clotting, and taking policosanol along with medications that also slow clotting might increase the chances of bruising and bleeding. Persons taking blood-thinning anticoagulants or antiplatelet medications such as aspirin, warfarin, heparin, clopidogrel, ticlopidine, or pentoxifylline should not use policosanol except on medical advice.

Drug Interactions

Cumulative data from long-term clinical trials have not indicated drug interactions or additive toxicity with calcium-channel blockers, angiotensin-converting-enzyme inhibitors, beta-blockers, diuretics, nitrates, nonsteroidal anti-inflammatory agents, anxiolytics, antidepressants, neuroleptics, oral hypoglycemic agents, digoxin, thyroid hormones, and antiulcer medications. However, formal drug interaction studies in humans have not been performed.

Policosanol may increase both the effects and the side effects of levodopa. Persons using natural supplements that thin the blood, such as garlic, ginkgo, or high-dose vitamin E, should not use policosanol except under physician supervision.

Surgical Precautions

Policosanol can slow blood clotting; there is a concern that it might increase the chance of extra bleeding during and after surgery, and stopping its use at least 2 weeks before a scheduled surgery has been recommended.

Pregnancy and Lactation

Policosanol should be avoided in pregnant and lactating women until further research can be performed to assure its safety in this population.

Bleeding Disorders

Policosanol can slow blood clotting and might increase the chance of bleeding in people with bleeding disorders.

Formulation-Specific Considerations

Products marketed as policosanol in the United States are often derived from beeswax or wheat germ, differing in composition from the sugarcane version and lacking robust research support. Because tetratriacontanol constitutes varying proportions in different source preparations — being relatively higher in some beeswax-derived products and lower in sugarcane-derived ones — safety and efficacy data from one policosanol source cannot be assumed to apply to preparations from another.

Independent Research Gaps

No safety data exist specifically for isolated tetratriacontanol administered to humans. All safety data pertain to the policosanol mixture and are largely derived from a single Cuban research group. Research groups outside of Cuba have failed to validate the cholesterol-lowering and antioxidant efficacy of policosanol; the lack of independent studies confirming the therapeutic benefits of policosanol in cardiovascular disease prevention and treatment raises questions regarding their true efficacy. The interactions between policosanol and medicines are not fully understood; as with most dietary supplements, the research on drug interactions with policosanol is incomplete.

References

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• CAS Common Chemistry: 1-Tetratriacontanol (CAS RN 28484-70-0)
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