Allyl mercaptan

Allyl Mercaptan: A Comprehensive Reference

1. Identity and Chemical Characterization

Names and Taxonomy

Allyl mercaptan (also known as 2-propene-1-thiol, or by its IUPAC name prop-2-ene-1-thiol) is an organosulfur compound with the molecular formula C₃H₆S. It has a molecular weight of 74.14 g/mol. The compound is also commonly abbreviated in the scientific literature as AM or AMT. Its CAS registry number is 870-23-5.

Physical and Chemical Properties

Allyl mercaptan is a volatile organosulfur compound and a key metabolite of garlic (Allium sativum). It is recognized for its potent biological activities, which are primarily attributed to its reactive sulfhydryl (–SH) group. This compound is characterized by its strong, pungent odor, often described as reminiscent of rotten cabbage or garlic. As a small, lipophilic molecule with a reactive thiol functional group, it is highly volatile and transient under ambient conditions, posing significant analytical challenges.

Natural Sources

Allyl mercaptan (AM) is a small molecule allyl derivative and an organosulfur compound derived from garlic and a few other genus Allium plants. Diallyl disulfide compounds are organosulfur compounds (OSC) which are released by plants of the Allium genus including onion, garlic, scallion, and leek.

Allyl mercaptan is not an innate compound within intact Allium tissues. Its formation is a direct consequence of cellular disruption. The biosynthetic pathway is initiated from the stable precursor alliin (S-allyl-L-cysteine sulfoxide), which is localized in the cytoplasm of Allium cells. The enzyme alliinase, sequestered in the vacuole, is released upon crushing, cutting, or other forms of tissue damage. Alliinase then catalyzes the conversion of alliin into the highly reactive and unstable allicin (diallyl thiosulfinate).

Biosynthesis and Generation from Allicin

Allyl mercaptan is the primary pre-hepatic metabolite of allicin. In the presence of glutathione, two allyl mercaptan molecules are produced from each allicin molecule. This reaction is known to occur very rapidly within red blood cells.

The complexation of allicin with cysteine in the blood results in allyl mercaptan generation. The key pathways of medicinal function of DADS or allicin are allyl mercaptan, or a subsequent metabolite. Additionally, S-allyl-mercapto-GSH can undergo a thiol/disulfide exchange reaction with an additional GSH to form allyl mercaptan and glutathione disulfide (GSSG).

Allicin is highly unstable, and rapidly degrades to a variety of organosulfur compounds, including DADS, DATS, and ajoene. These compounds give rise to allyl mercaptan and, secondarily, allyl methyl sulfide; allyl mercaptan has been suggested to be the ultimate active chemical species derived from garlic consumption.

Place Among Garlic Organosulfur Compounds

The organosulfur compounds of garlic include oil-soluble constituents diallyl sulfide, diallyl disulfide (DADS), diallyl trisulfide, dithiins, and ajoene; water-soluble derivatives S-allyl cysteine (SAC) and S-allyl mercaptocysteine (SAMC); and metabolites allyl mercaptan (AM) and allyl methyl sulfide. When the garlic bulb is smashed, alliin is changed to allylsulfenate due to the enzyme alliinase and the cofactor pyridoxal phosphate, which then dimerizes to form diallyl thiosulfinate (allicin), as well as other volatile substances including allyl mercaptan, among many others.

Common Forms and Preparations

Allyl mercaptan is not commercially available as an isolated dietary supplement for human consumption. It is encountered in the body as a metabolite following ingestion of garlic-derived foods and preparations. Relevant preparations from which allyl mercaptan is generated include: raw crushed garlic cloves; garlic oil (via steam distillation); garlic powder (dehydrated); and aged garlic extract (AGE). Allyl mercaptan is a significant, albeit transient, organosulfur compound that contributes to the characteristic aroma and potential bioactivity of Allium species. Its formation is intricately linked to the enzymatic breakdown of alliin and the subsequent degradation of allicin. The quantitative analysis of allyl mercaptan is challenging due to its volatility and reactivity, necessitating carefully controlled experimental conditions and validated analytical methods such as headspace gas chromatography–mass spectrometry (HS-GC-MS).

2. Traditional and Historical Use

Allyl mercaptan itself was not identified or named as a distinct compound in traditional medicine. However, it arises as a metabolite from garlic (Allium sativum), which has an exceptionally deep historical record of medicinal use across multiple civilizations. Traditional uses of garlic thus form the historical context within which allyl mercaptan's biological significance must be understood.

Ancient Egypt and the Mediterranean World

Garlic (Allium sativum) is one of the earliest domesticated plants, with evidence of its use dating back more than 5,000 years. It originated in Central Asia, particularly in regions such as the Tien Shan and Pamir mountain ranges, before spreading through trade networks such as the Silk Road and the Columbian Exchange. Its adaptability to diverse climates and its dual role as a food and medicine facilitated its integration into various cultures globally. By 3000 BCE, garlic had become a dietary and medicinal staple in ancient Egypt, where it was valued for enhancing physical endurance and offered as a sacred gift to deities. Its medicinal benefits have been found transcribed on ancient temple walls and on papyrus dating back to 1500 BC.

Ancient China and India

In ancient Chinese medicine, garlic was prescribed to aid respiration and digestion, most importantly for diarrhea and worm infestation. As a spicy food, its regular consumption was recommended but in limited quantities. Evidence also suggests that garlic was utilized to treat sadness or depression. Fatigue, headache, and insomnia were often treated with garlic. There are also indications that garlic was used to treat and improve male potency.

Throughout history, garlic has been employed in traditional medicine systems such as Ayurveda and Unani, symbolizing its significance in holistic health practices.

Cross-Cultural Applications

Ancient cultures, including those of Egypt, Greece, China, Persia, Sumer, and India, recognized garlic's antimicrobial, cardiovascular, and immune-enhancing properties, integrating it into diets, rituals, and medicinal practices. Garlic, a common component of the human diet, has been used since ancient times in the folk medicine of different cultures. Interest in the potential benefits of garlic was noted in records found in Egyptian pyramids and ancient Greek temples, as well as in ancient texts — including medical literature — from China, Egypt, Greece, India, Israel, and Rome, in which its use was prescribed.

In the past, garlic has been utilized as a remedy during various epidemics such as typhus, dysentery, cholera, and influenza, and whenever an epidemic emerged, garlic was the first preventive and curative remedy used.

Specific preparation methods, such as fermentation and aging, contributed to the therapeutic versatility of garlic, as observed in black garlic traditions.

3. Key Constituents, Metabolic Context, and Mechanisms of Action

Relationship to the Garlic Organosulfur Family

Bulbs of Allium sativum are reported to contain hundreds of phytochemicals, including sulfur-containing compounds such as ajoenes, thiosulfinates (allicin), vinyldithiins, and sulfides (DADS, DATS), which accounted for 82% of the overall garlic sulfur content. Within this phytochemical matrix, allyl mercaptan occupies a terminal metabolic position. Garlic compounds such as alliin, allicin, S-allylcysteine (SAC), S-allyl mercaptocysteine (SAMC), diallyl sulfide (DAS), diallyl disulfide (DADS), and diallyl trisulfide (DATS) are metabolized to allyl mercaptan (AM), allyl methyl sulfide, and methyl mercaptan.

The Sulfhydryl Group as Reactive Center

The primary chemical reactivity of allyl mercaptan resides in its free sulfhydryl (–SH) group. The reactive organosulfur compounds form disulfide bonds with free sulfhydryl groups of enzymes and can thereby compromise the integrity of cellular machinery. This reactivity underlies multiple proposed mechanisms including HDAC inhibition and free-radical scavenging.

HDAC Inhibition (Epigenetic Mechanism)

The most extensively characterized mechanism of allyl mercaptan is its inhibition of histone deacetylases (HDACs). HDAC inhibitors have the potential to derepress epigenetically silenced genes in cancer cells, leading to cell cycle arrest and apoptosis. In a key study, several garlic-derived small organosulfur compounds were screened for their ability to inhibit HDAC activity in vitro, and among all organosulfur compounds examined, allyl mercaptan (AM) was the most potent HDAC inhibitor. Molecular modeling, structure-activity, and enzyme kinetics studies with purified human HDAC8 provided evidence for a competitive mechanism (Ki = 24 μM AM).

Allyl mercaptan induced histone acetylation in the liver and was also recognized as the active HDAC inhibitor rather than the parent compound DADS. The authors reported that allyl mercaptan inhibits 92% of HDAC activity, while the parent compound DADS inhibited only 29% at the concentration of 200 µM.

In primary rat hepatocytes, DADS was metabolized to AM within 30 minutes, and AM was more effective than its precursors (DADS and SAMC) at inhibiting HDAC activity under cell-free conditions.

Histone acetylation, a well-studied posttranslational histone modification, is controlled by the opposing activities of histone acetyltransferases (HATs) and histone deacetylases (HDACs). By removing acetyl groups, HDACs reverse chromatin acetylation and alter transcription of oncogenes and tumor suppressor genes.

p21^WAF1 Gene Induction

In AM-treated human colon cancer cells, HDAC inhibition was accompanied by a rapid and sustained accumulation of acetylated histones in total cellular chromatin. Chromatin immunoprecipitation assays confirmed the presence of hyperacetylated histone H3 on the P21WAF1 gene promoter within 4 hours of AM exposure, and there was increased binding of the transcription factor Sp3. At a later time point (24 h), there was enhanced binding of p53 in the distal enhancer region of the P21WAF1 gene promoter. These findings suggest a primary role for Sp3 in driving P21 gene expression after HDAC inhibition by AM, followed by the subsequent recruitment of p53. Induction of p21Waf1 protein expression was detected at time points between 3 and 72 h after AM treatment and coincided with growth arrest in G(1) of the cell cycle.

Antioxidant and Free Radical Scavenging Activity

Studies on the antioxidative-stress properties of garlic components including allyl mercaptan (AMT) demonstrated that allyl mercaptan was able to trap trichloromethyl and trichloromethylperoxyl free radicals. However, diallyl disulfide (DDS), but not allyl mercaptan, also inhibited carbon tetrachloride (CCl4)-promoted liver microsomal lipid peroxidation, indicating that the antioxidant profile of allyl mercaptan is selective and not uniformly superior to its precursor compounds.

Cholesterol Synthesis Inhibition

Of nine garlic-derived compounds tested for their ability to inhibit cholesterol synthesis in hepatocyte studies, only diallyl disulfide, diallyl trisulfide, and allyl mercaptan proved inhibitory, each yielding a pattern of sterol accumulation identical to that obtained with garlic extract. These results indicate that compounds containing an allyl-disulfide or allyl-sulfhydryl group are most likely responsible for the inhibition of cholesterol synthesis by garlic, and that this inhibition is likely mediated at sterol 4α-methyl oxidase.

4. Scientific Evidence by Area of Use

4.1 Epigenetics and Cancer — HDAC Inhibition

Evidence type: Predominantly in vitro (cell culture) and ex vivo. No standalone human clinical trials have been conducted on isolated allyl mercaptan.

Inhibition of HDAC activity by AM in human colon cancer cells was accompanied by a rapid, sustained accumulation of acetylated histones. Chromatin immunoprecipitation assays revealed an increase in acetylated histone H3 on the P21WAF1 gene promoter within 4 hours of AM exposure.

Recent evidence suggests that dietary constituents can act as HDAC inhibitors, such as the isothiocyanates found in cruciferous vegetables and the allyl compounds present in garlic. A large number of HDAC inhibitors are of natural origin and present in garlic (allyl mercaptan), blueberries (piceatannol), broccoli (sulforaphane), and grapes (resveratrol).

The bioactive compounds in garlic having anticancer properties include diallyl trisulfide, allicin, allyl mercaptan, diallyl disulfide, and diallyl sulfide. Different garlic-derived constituents and their nanoformulations have been tested for their effects against various cancers including skin, ovarian, prostate, gastric, breast, lung, colorectal, liver, oral, and pancreatic cancer.

Garlic organosulfur compounds can alter xenobiotic drug-metabolizing enzymes and inhibit the formation of carcinogen–DNA adducts. These compounds also produce antiproliferative effects in cancer cells, leading to cell cycle arrest and/or apoptosis.

Evidence strength: Preclinical (in vitro and animal). The HDAC-inhibitory activity is mechanistically well characterized in cell culture models, particularly for human colon cancer cells. No direct clinical evidence from human interventional trials exists specifically for isolated allyl mercaptan. Effects are inferred partly from garlic consumption studies where allyl mercaptan is one of several metabolites present.

4.2 Cholesterol and Lipid Metabolism

Evidence type: In vitro (cell culture, hepatocytes) and animal models.

One study was undertaken to compare the effects of allyl mercaptan (AM), a major metabolite of garlic, with several garlic constituents and extracts on cytotoxicity, cholesterol synthesis, and its secretion in Hep-G2 cells. The ability of garlic to reduce cholesterol levels is believed to be brought about by a metabolite of allicin — allyl mercaptan (AM) — which reduces the function of a key enzyme involved in cholesterol synthesis.

This compound was also found to decrease systolic blood pressure, production of fatty acids, serum cholesterol, and triglycerides in rats fed with a diet rich in cholesterol.

Although allyl mercaptan is not inhibitory to squalene monooxygenase, several of the precursors and intermediates leading to this compound are inhibitory; most notably, SAC is one of the more effective inhibitors found in such studies.

Evidence strength: Preliminary; largely in vitro and animal-based. No human clinical trials have assessed isolated allyl mercaptan for lipid modulation. Clinical evidence exists for garlic extracts on cholesterol levels, but the specific contribution of allyl mercaptan cannot be isolated from other co-occurring compounds.

4.3 Antimicrobial Activity

Evidence type: In vitro and preclinical.

Garlic has been used traditionally to treat various ailments especially bacterial infections for centuries. The principal phytochemicals that exhibit antibacterial activity are oil-soluble organosulfur compounds that include allicin, ajoenes, and allyl sulfides. The organosulfur compounds of garlic exhibit a range of antibacterial properties such as bactericidal, antibiofilm, antitoxin, and anti-quorum sensing activity against a wide range of bacteria including multi-drug resistant (MDR) strains.

Several in vitro and in vivo studies have reported that garlic and its bioactive constituents have several pharmacological activities, including anti-inflammatory, anticancer, antidiabetic, antihypertensive, anti-obesity, antimicrobial, antioxidant, antithrombotic, and anti-Alzheimer activities.

Evidence strength: Weak and largely indirect for allyl mercaptan specifically. Antimicrobial studies on garlic-derived organosulfur compounds most commonly focus on allicin, DADS, and ajoene, with allyl mercaptan's specific contribution only rarely isolated. No human clinical evidence exists for allyl mercaptan as a standalone antimicrobial agent.

4.4 Antioxidant Activity

Evidence type: In vitro / mechanistic.

Studies specifically characterizing the antioxidant-stress properties of allyl mercaptan (AMT) found that it was able to trap trichloromethyl and trichloromethylperoxyl free radicals in chemical assays. This radical-trapping activity suggests that AM can act as a reactive oxygen species (ROS) scavenger under specific conditions, though its activity is more selective than that of diallyl disulfide.

Raw garlic-derived compounds contain organosulfur components susceptible to oxidation, volatilization, and deterioration when exposed to unfavorable conditions such as light, oxygen, and high temperatures. These components are also thermodynamically unstable.

Evidence strength: Preliminary and in vitro only. No human clinical data on allyl mercaptan as an antioxidant intervention exist.

5. Pharmacokinetics and Metabolism in Humans

Formation After Garlic Ingestion

Although finding allicin or its metabolites in the blood or urine after garlic consumption has been elusive, it has been known for some time that allyl mercaptan and allyl methyl sulfide (AMS) are components of the breath soon after garlic consumption, with allyl mercaptan disappearing by 1 hour and AMS having substantially disappeared in 20 hours.

Conversion to Allyl Methyl Sulfide

AMS concentration in human breath increases within 5 minutes after ingestion of garlic. AMS appears to be formed rapidly through methylation of allyl mercaptan by S-adenosylmethionine and gut microflora and is then exhaled. One route to AMS in breath occurs from the lung via the blood. When AMS is formed from precursors such as allicin, DADS, and allyl mercaptan, it moves into the blood and then into the lungs, where AMS is exhaled.

Studies on human breath demonstrated that: (a) the area under the 32-hour breath AMS concentration curve (AUC) is linearly proportional to the amount of allicin consumed; (b) AMS is the main breath metabolite of allicin, accounting for at least 90% of the allicin consumed; and (c) allyl mercaptan is a temporary intermediate in the formation of AMS from allicin.

Enzyme-Mediated Methylation and Tissue Distribution

Because AMS is S-methylated allyl mercaptan, "thiol S-methyltransferase" enzymes are likely to be involved. These enzymes are distributed in a variety of tissues, but the concentrations are highest in the digestive and excretory tract (stomach mucosa, cecal mucosa, colonic mucosa, liver, and kidney) and lung, indicating that their primary purpose is probably the detoxification of ingested or inhaled substances.

Transient Nature and Analytical Challenges

Allyl mercaptan is a significant, albeit transient, organosulfur compound. Its formation is intricately linked to the enzymatic breakdown of alliin and the subsequent degradation of allicin. The quantitative analysis of allyl mercaptan is challenging due to its volatility and reactivity, necessitating carefully controlled experimental conditions and validated analytical methods such as HS-GC-MS.

6. Body Systems and Health Areas of Association

Epigenetic Regulation / Oncology

Allyl mercaptan has garnered attention due to its biological activities, particularly as a histone deacetylase inhibitor, making it one of the most effective garlic-derived organosulfur compounds known to date. Research suggests that allyl mercaptan's biological activity stems from its ability to inhibit histone deacetylases (HDACs). Over the last several decades, it has become clear that epigenetic abnormalities may be one of the hallmarks of cancer. Posttranslational modifications of histones may play a crucial role in cancer development and progression by modulating gene transcription, chromatin remodeling, and nuclear architecture.

Cardiovascular System / Lipid Metabolism

Allyl mercaptan is associated with the cardiovascular health domain primarily through its reported inhibitory effects on cholesterol biosynthesis enzymes in preclinical models. The ability of garlic to reduce cholesterol levels is believed to be brought about by allyl mercaptan, which reduces the function of a key enzyme involved in cholesterol synthesis. Its role in the conversion of other garlic compounds (DADS, DATS) which themselves inhibit HMG-CoA reductase also situates it within the broader cardiovascular pharmacology of garlic.

Digestive System

Allyl mercaptan is the odorant molecule responsible for garlic breath and results from the interaction of allicin or diallyl disulfide with cysteine in the presence of S-allyl-mercapto cysteine. The digestive tract is the primary site of allyl mercaptan generation following garlic consumption, and the compound is rapidly metabolized by intestinal and hepatic enzymes. Its HDAC-inhibitory properties have been studied in the context of colorectal cancer specifically, given the relevance of epigenetic silencing to colon carcinogenesis.

Oxidative Stress and Cellular Defense

Garlic's powerful antioxidant action contributes to reducing the harm that oxidative stress causes to critical biomolecules in the body, which helps in disease prevention. Allyl mercaptan participates in this antioxidant network through its free-radical-trapping capacity, though it is considerably less stable than other garlic-derived antioxidants such as SAC.

7. Dosage Forms and Reported Study Concentrations

Allyl mercaptan is not available as a standalone dietary supplement or pharmaceutical agent. It is not administered directly in clinical or nutritional settings. The following concentrations have been reported exclusively in preclinical (laboratory) research:

• Among the organosulfur compounds examined in HDAC inhibition studies, AM was the most potent HDAC inhibitor, with enzyme kinetics studies using purified human HDAC8 demonstrating a competitive inhibition constant (Ki) of 24 μM AM.
• In one study, allyl mercaptan was reported to inhibit 92% of HDAC activity at the concentration of 200 µM, while the parent compound DADS inhibited only 29% at the same concentration.
• AM was identified as a competitive HDAC inhibitor (Ki = 24 µM with human HDAC8) and induced histone acetylation in colon cancer cells.

These concentrations were used in cell-free and cell culture (in vitro) experimental systems. Whether these concentrations are achievable in human tissues following dietary garlic intake is not established in the available literature. No human clinical trial has established a dosing regimen for isolated allyl mercaptan.

8. Safety Considerations and Interactions

Volatility and Reactivity

Raw garlic-derived compounds contain organosulfur components susceptible to oxidation, volatilization, and deterioration when exposed to unfavorable conditions such as light, oxygen, and high temperatures. These components are also thermodynamically unstable. Allyl mercaptan, being among the most volatile of the garlic-derived organosulfur compounds, degrades rapidly after formation.

Garlic Breath as an Index of Exposure

Allyl mercaptan and diallyl disulfide are among the malodorous constituents of garlic breath. Allyl mercaptan disappears from breath by approximately 1 hour after garlic consumption, while AMS (its methylated metabolite) has substantially disappeared within 20 hours. Detection of allyl mercaptan in breath thus serves as a transient biomarker of allicin metabolism rather than a persistent exposure.

Selectivity of Antioxidant and Enzyme Effects

While allyl mercaptan can trap trichloromethyl and trichloromethylperoxyl free radicals, it does not inhibit CCl4-promoted liver microsomal lipid peroxidation (an effect that was found only for diallyl disulfide). This indicates that allyl mercaptan's biological activity profile differs from — and in some respects is narrower than — those of its precursors.

Garlic Safety Context

While allyl mercaptan has not been the subject of dedicated human safety or toxicology trials, it exists within the safety context of garlic consumption generally. Allicin, the primary precursor to allyl mercaptan, is a lipid-soluble sulfur compound that can be easily damaged by cooking and has the ability to provoke intolerance, allergic reactions, and gastrointestinal disorders. Allicin can provoke intolerance, allergic reactions, and gastrointestinal disorders.

Toxicological evaluations, including both acute and chronic toxicity studies, have confirmed the safety of aged garlic extract (AGE) for human use, though these studies concern the broader extract rather than isolated allyl mercaptan.

Thiol S-Methyltransferase Enzyme System

Because AMS is S-methylated allyl mercaptan, "thiol S-methyltransferase" enzymes are likely to be involved in its metabolism. These enzymes are distributed in a variety of tissues, with the highest concentrations in the digestive and excretory tract (stomach mucosa, cecal mucosa, colonic mucosa, liver, and kidney) and lung, indicating that their primary purpose is the detoxification of ingested or inhaled substances. Individuals with altered thiol S-methyltransferase enzyme function could theoretically experience different rates of allyl mercaptan clearance, though this has not been directly studied in clinical settings.

Interactions with Drug-Metabolizing Enzymes

Garlic organosulfur compounds can alter xenobiotic drug-metabolizing enzymes and inhibit the formation of carcinogen–DNA adducts. In general, organosulfur compounds are known to modulate the activity of several enzymes involved in the activation or detoxification of carcinogens. Since allyl mercaptan is a metabolite of these broader organosulfur compounds, it may participate in modulation of cytochrome P450 and glutathione S-transferase pathways, though specific interaction data for isolated allyl mercaptan in humans are not available in the reviewed literature.

Evidence Limitations

The overwhelming majority of data on allyl mercaptan derives from in vitro cell culture models and, to a lesser extent, animal studies. In solid tumors, monotherapy with HDAC inhibitor agents has yielded insufficient responses in human trials, providing important context for the gap between in vitro mechanistic findings and translational outcomes. No interventional human clinical trials have been conducted using isolated allyl mercaptan as a therapeutic or supplemental agent.

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