Anisha Riggs
Coumarin is a synthetic aromatic lactone with a distinctive sweet, almondy-hay scent and herbaceous and powdery nuances. It is widely used in perfumery and is derived from tonka beans, though it can also be synthetically produced. Coumarin has a long history of use in perfumes, dating back to the late 19th century when it was a key ingredient in Fougère Royale, considered the first modern perfume. Its use declined in the 1950s due to safety concerns as it was found to be toxic to the liver in animals, but it remains a popular ingredient in modern perfumery when used within controlled limits. Coumarin is known for its ability to enhance and extend the sweetness of fragrances, making it a versatile ingredient in the creation of perfumes.
| Characteristics | Values |
|---|---|
| Odor | Sweet, aromatic, coconut, herbaceous, warm, spicy, hay-like, nutty, tobacco-like, almond, almondy, vanillic, creamy, gourmand |
| Odor profile | Intense, powdery, creamy, sweet |
| Odor masking agent | Used to cover iodine, phenol, or camphor notes in industrial blends |
| Odor persistence | Low volatility, evaporates slowly, allowing fragrance to last longer on the skin |
| Odor enhancer | Used with natural essential oils such as lavender, citrus, rosemary, and oak moss to achieve a long-lasting effect |
| Sources | Tonka beans, sweet clover, cinnamon, cassia, lavender, woodruff, synthetic |
| Toxicity | Found to be toxic to the liver in animals, banned as a food additive in many countries |
| Regulatory restrictions | Restricted to 1.6% in the final perfume product, up to 0.1% in cosmetic products |
| Fixative | Yes, helps stabilize other volatile ingredients and prevent them from evaporating too quickly |
| Use in perfumes | Fougère Royale, Shalimar, Tabu, Chypre-type fragrances, oriental and amber fragrances |
| Use in other products | Soaps, detergents, lotions, deodorants, tobacco, household and industrial products |
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What You'll Learn
Coumarin's sweet, powdery, almondy, and herbaceous scent
Coumarin is a synthetic aromatic lactone with a distinctive sweet, powdery, almondy, and herbaceous scent. It is widely used in perfumes, cosmetics, and other fragrance and flavouring applications.
The scent of coumarin is often described as reminiscent of freshly mown hay, with sweet, gourmand, almond-vanillic, and nutty nuances. It is also associated with tobacco, having been used to flavour pipe tobacco and cigarettes. In perfumery, it is commonly used in Fougère compositions as a fixative and backbone ingredient, paired with notes like lavender and amyl salicylate. It is particularly well-suited to vintage-style and mossy-fruity fragrances, where it serves as a transitional fixative, adding volume, warmth, and longevity.
The distinctive scent of coumarin is derived from its chemical structure. It is a synthetic compound, first isolated from tonka beans in 1820 by August Vogel, who mistook it for benzoic acid. However, it was soon after identified as a unique compound and named "Coumarin" by French pharmacist Nicholas Jean Baptiste Gaston Guibourt. Coumarin can be obtained from natural sources, but for commercial use, it is predominantly produced synthetically using various methods, such as the Raschig process, Pechmann reaction, and Perkin reaction.
The use of coumarin in perfumes is subject to regulatory restrictions due to its potential allergenic effects. Its concentration in perfumes is typically limited to 1.6% and lower in cosmetic products. Despite these restrictions, coumarin remains a foundational element in perfumery, valued for its ability to enhance and modify other fragrance notes.
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How to dilute coumarin in perfumers alcohol
Coumarin is a synthetic aromatic lactone with a distinctive sweet, almondy-hay scent and herbaceous and powdery nuances. It is widely used in perfumery, despite regulatory restrictions, and is subject to IFRA restrictions. Coumarin is known to be toxic to the liver of rats and the liver and lungs of mice.
When using coumarin in perfumery, it is important to dilute it properly in perfumer's alcohol. Some people have reported difficulties in achieving the correct ratio, with their mixtures evaporating and crystallizing. Coumarin crystals dissolve easily in alcohol, but it is important to use only a small amount, as too much can overwhelm a mixture. A concentration of 0.1% is recommended, with only a drop or two used at a time.
It is important to use the correct type of alcohol when diluting coumarin. Some perfumer's alcohols are not acceptable for commercial use as they contain compounds such as monopropylene glycol and isopropyl myristate. In the UK, Trade Specific Denatured Alcohol No 1 (TSDA 1) is specifically authorized for use in fragrances. Only TSDA numbers 1 and 5 are approved for perfume use. Outside the UK, denatured alcohol or its equivalent must be used, which can be sourced from various companies in Europe, the USA, and Canada.
When creating perfumes, it is advisable to dilute perfumery ingredients in alcohol. This saves money, as only a fraction of the oil is used, allowing for more room to experiment. Alcohol also makes it easier to work with viscous or semi-solid oils and those that come in crystal form, such as coumarin. The alcohol 'lifts' the scent from the strip, giving a clearer idea of the notes and their nuances. It provides a definitive impression of the finished perfume, allowing the nose to notice more notes. However, it is important to avoid using ethanol alcohol found in DIY stores, as this may contain methanol or other harsh chemicals that can be toxic or irritate the skin.
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Coumarin's history in perfumery
Coumarin, an organic compound, has been widely used in perfumery since the late 1800s as one of the first synthetic aroma chemicals. It is derived from the French word "coumarou", which means tonka bean, and was first isolated from these beans in 1820 by A. Vogel, who initially mistook it for benzoic acid. In the same year, French pharmacist Nicholas Jean Baptiste Gaston Guibourt independently isolated coumarin and realised it was not benzoic acid, naming it "coumarine".
Coumarin is a lactone, an internal (cyclic) ester, and is often described as having a sweet, powdery, almondy, and herbaceous scent. It is used in perfumery to modify sharp herbal top notes while extending sweetness in the base. It is particularly useful in vintage-style and mossy-fruity fragrances, as well as in Fougère and Oriental compositions, where it offers volume, warmth, and fixative power.
Before the late 1890s, coumarin was obtained commercially only from natural sources, primarily tonka beans, but synthetic methods of preparation and industrial manufacturing processes were later developed. Coumarin is now mostly produced synthetically for commercial use. It is highly sought after in the fragrance industry due to its unique sweet note and stability.
Despite its popularity, coumarin use is restricted to 1.6% in perfumes and 0.1% in cosmetic products due to its allergenic status and potential health risks. In high concentrations, coumarin is toxic to the liver of rats and the liver and lungs of mice. It is banned as a food additive in many countries, including the EU and the US, but is still used in some countries as a flavouring agent in food and beverages.
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Coumarin's use in tobacco
Coumarin is a synthetic aromatic lactone with a distinctive sweet, almondy-hay scent and herbaceous and powdery nuances. It is widely used in the fragrance industry, including in perfumes, deodorants, soaps, detergents, and lotions. In addition to its use in the perfumery and cosmetic industries, coumarin has several other applications, including its use in tobacco products.
Coumarin has been commonly used in the flavouring of pipe tobacco and cigarettes. Its sweet odour is now associated with tobacco scents. While tobacco absolute does not contain any significant amount of coumarin, it is often paired with coumarin in tobacco accords in perfumes. Coumarin is also used in smokeless tobacco products, such as snuff and chewing tobacco. The amount of coumarin extracted from smokeless tobacco products depends on the concentration in the product, the rate of consumption, and the proportion of coumarin extracted during use.
The use of coumarin in tobacco products has been controversial due to health concerns. Coumarin is considered toxic to the liver and kidneys of rodents, and it has been linked to increased lung tumours in mice and hepatocellular adenomas in females. In 1995, the addition of coumarin to cigarette tobacco by Brown & Williamson led to executive Dr Jeffrey Wigand contacting CBS News and expressing concerns that a "form of rat poison" was being used as an additive. Dr Wigand classified coumarin as a "lung-specific carcinogen". However, it is important to note that poisoning by coumarin is extremely rare and has only occurred in clinical settings where high doses were administered for medical treatments.
The regulations regarding coumarin in tobacco products vary by region. In Germany, coumarin is banned as an additive in tobacco products. In the United States, there are currently no regulations governing the levels of coumarin in tobacco products. However, the Food and Drug Administration (FDA) has evaluated the health risks associated with coumarin and other toxicants in tobacco products. The European Food Safety Authority (EFSA) has determined a safe intake level of 0.1 mg/kg body weight per day for coumarin, and this has been adopted into European law for certain food and beverage products.
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Coumarin's toxicity and safety concerns
Coumarin is a synthetic aromatic lactone with a distinctive sweet, almondy-hay scent and herbaceous and powdery nuances. It is widely used in the fragrance industry due to its unique scent profile and ability to enhance other fragrances. However, coumarin has also been associated with toxicity and safety concerns, which have led to regulatory restrictions on its use.
One of the primary concerns associated with coumarin is its potential to cause liver damage. Animal studies have shown that exposure to coumarin can lead to liver toxicity and even severe hepatitis in humans. In addition, high doses of coumarin have been linked to cognitive impairment and short-term side effects such as nausea, diarrhoea, and headaches. According to a review published in Food and Chemical Toxicology, exposure to coumarin from food or cosmetic products does not pose any health risk to humans. However, the same review also highlights the need for more research to understand the potential long-term effects of coumarin exposure, especially on the liver and cognitive function.
Coumarin has also been associated with an increased risk of cancer. Studies in mice have shown that exposure to coumarin can lead to an increase in lung tumours (adenomas and carcinomas) in both males and females and hepatocellular adenomas in females. However, evidence of carcinogenic effects in humans is limited, and more research is needed to determine the potential cancer-causing effects of high doses of coumarin.
The use of coumarin is regulated to mitigate the potential risks associated with exposure. In perfumes, the use of coumarin is restricted to 1.6%, and in cosmetic products, it is limited to 0.1%. These restrictions are in place to ensure that exposure to coumarin remains within safe limits and to minimise potential health risks.
In addition to these safety concerns, coumarin has a history of being mistaken for rat poison due to its association with sweet clover, which contains the harmful compound dicoumarin. However, it is important to note that coumarin itself is not an anticoagulant, and its use as a food additive has been banned in many countries due to its potential health risks.
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Frequently asked questions
Coumarin is a synthetic aromatic lactone with a distinctive sweet, almondy-hay scent and herbaceous and powdery nuances.
The use of coumarin is restricted to 1.6% in the final perfume product. It is important to note that coumarin is toxic to the liver in animals, and its use in perfumes declined in the 1950s due to safety concerns.
Coumarin has a sweet, powdery, almondy, and herbaceous scent. It is often associated with tobacco, coconut, and milk.
Coumarin can be purchased from various suppliers, such as Fraterworks, Scentspiracy, and PerfumersWorld.
