Seamus Hammond
Some perfumes contain a chemical called indole, which is found in white flowers and, coincidentally, also in poo. At low concentrations, indole has a flowery smell and is used in many perfumes and fragrances. However, in large concentrations, indole is associated with an intense fecal smell. The scent of indole can be overwhelming and off-putting to some people, especially when used in excessive amounts. Interestingly, the perception of indole's fecal scent varies among individuals, with some finding it less offensive than others.
| Characteristics | Values |
|---|---|
| Chemical compound | Indole |
| Found in | Human feces, white flowers, orange blossoms, chocolates, coffees, fruity-flavored sweets |
| Smell | At low concentrations, it has a flowery smell. At high concentrations, it has an intense fecal smell. |
| Perception | Some people perceive indole as fecal, while others do not. |
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What You'll Learn
- Indoles: a molecule found in poop and some flowers
- Jasmine fragrances: can smell like sweat or feces
- Scent concentration: too much scent activates receptors associated with bad scents
- Tryptophan: eating foods containing this can cause high indole concentrations
- Individual differences: indoles are only fecal to some people
Indoles: a molecule found in poop and some flowers
Indoles are molecules that are found in both human faeces and some flowers. Indole is composed of two carbon rings joined together with hydrogen spikes at each joint and a single nitrogen atom. While indole is commonly associated with the smell of faeces, particularly at high concentrations, it is also present in flowers such as jasmine, orange blossoms, and white flowers. It is added to perfumes to create flowery fragrances. However, the perception of indole varies among individuals, with some finding it faecal-like and others not detecting any faecal notes.
Indole is a chemical compound that occurs naturally in human faeces and has an intense faecal smell at high concentrations. According to the Human Metabolome Database (HMDB), indole is a constituent of many flower scents and perfumes, where it contributes to the floral aroma at very low concentrations. This duality of indole's scent, depending on its concentration, is intriguing and highlights the complex nature of fragrance chemistry.
The presence of indole in perfumes is a deliberate choice by perfumers. They utilise indole's unique properties to create desirable floral fragrances. However, the key to successfully incorporating indole lies in its concentration. When used in small amounts, indole can enhance the complexity and depth of a perfume's scent, adding a subtle floral touch. On the other hand, when indole is present in high concentrations, it can overpower the other notes and contribute an unpleasant faecal odour to the perfume.
The perception of indole's scent is subjective and varies across individuals. Some people are highly sensitive to the faecal aspect of indole, finding it off-putting or even horrifying in perfumes. On the other hand, others may not associate indole with a faecal smell at all and instead perceive it as a pleasant or neutral floral note. This variation in perception adds an intriguing layer to the world of perfumery, where individual body chemistry and olfactory senses play a crucial role in scent interpretation.
While indole is commonly associated with the scent of faeces, particularly in high concentrations, it is important to note that it is not the only factor contributing to the overall smell of human waste. The complex mixture of volatile organic compounds (VOCs) present in faeces, including skatole and volatile fatty acids, also play a significant role in its characteristic odour. However, indole's prominence in both faeces and floral fragrances makes it a fascinating molecule, showcasing the intricate interplay between scent, chemistry, and human perception.
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Jasmine fragrances: can smell like sweat or feces
Jasmine is a popular scent in the fragrance industry, with a rich, sweet, fruity, and sensual floral scent. It is a timeless symbol of love, femininity, and seduction. However, some jasmine fragrances have been described as having a ""poop-whiff" or an "indolic smell." Indole is a chemical compound that is naturally present in jasmine flowers and jasmine oil, and it is responsible for the fecal scent in some perfumes.
Indole is a molecule found in human feces and has an intense fecal smell at high concentrations. However, at very low concentrations, it emits a flowery fragrance. This is why indole is commonly used in floral perfumes, including jasmine fragrances. While indole is naturally occurring in jasmine, it is also intentionally added to enhance the scent of the perfume.
The concentration of indole can significantly impact its scent. When indole is present in large amounts, it can bind to a wider range of receptors in the nose, resulting in an overwhelming and unpleasant smell. On the other hand, a small amount of indole will stick to fewer receptors associated with more acceptable scents, resulting in a pleasant floral fragrance.
Interestingly, when the jasmine scent is combined with the actual smell of feces, it can cancel out the fecal odor. This unique interaction between jasmine and fecal scents can be useful for those who accidentally purchase an indolic fragrance.
It is worth noting that not all jasmine fragrances will have a fecal smell. The presence of indole and its concentration can vary among different jasmine species and perfumes. Some jasmine perfumes, such as Aventus and Chanel Allure Pour Homme, are known for their absence of fecal or indolic odors.
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Scent concentration: too much scent activates receptors associated with bad scents
Some perfumes contain a chemical called indole, which is found in white flowers and is also naturally occurring in human feces. At very low concentrations, indole has a flowery smell and is often used in floral perfumes and fragrances. However, at higher concentrations, it can smell like feces.
The sense of smell is a complex process that involves the binding of scent molecules to receptors in the nose. When a scent is encountered in large concentrations, it is believed to bind to a wider range of receptors than when only a trace amount is present. This means that a strong concentration of a scent may activate receptors associated with bad smells, leading to the perception of an unpleasant odor.
In the case of indole, it is commonly added to perfumes to enhance floral notes. However, when used in high doses, it can result in the perfume taking on a fecal undertone. This phenomenon is not universal, as some individuals may find that they are not affected by the fecal scent of indole at all, while others are highly sensitive to it.
Additionally, it is important to note that the perception of scent is highly subjective and can be influenced by various factors. For example, the scent of a perfume can change based on an individual's body chemistry, affecting how the fragrance interacts with the body's natural scent. Moreover, the perception of a scent can change over time as the nose becomes accustomed to a particular fragrance.
To avoid the unpleasant fecal scent associated with indole, it is recommended to use perfumes with this ingredient in moderation, as over-application may result in activating the receptors associated with bad scents.
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Tryptophan: eating foods containing this can cause high indole concentrations
Tryptophan is an essential α-amino acid that is used in the biosynthesis of proteins. It is not synthesized from simpler substances in humans and other animals, so it needs to be present in the diet in the form of tryptophan-containing proteins. Tryptophan contains an α-amino group, an α-carboxylic acid group, and a side chain indole, making it a polar molecule with a non-polar aromatic beta carbon substituent.
Indole, which is derived from tryptophan, has been found to function as a signaling molecule that can modulate the secretion of glucagon-like peptide-1 (GLP-1) from mouse colonic enteroendocrine L cells. GLP-1 plays a critical role in stimulating insulin secretion from pancreatic beta cells, suppressing appetite, and slowing gastric emptying. Thus, intestinal levels of indole may affect appetite.
Several bacterial species have been reported to convert tryptophan into indole and indole derivatives. Lactobacillus spp., for example, convert tryptophan to indolealdehyde (IAld) and indolelactic acid (ILA) via the aromatic amino acid aminotransferase (ArAT) and an indolelactic acid dehydrogenase (ILDH). Ruminococcus gnavus converts tryptophan into tryptamine by the action of a tryptophan decarboxylase enzyme.
Indole has been detected in human fecal samples of healthy adults at a mean concentration of 2.6 mM. At very low concentrations, indole has a flowery smell and is a constituent of many flower scents (such as orange blossoms) and perfumes. However, in large concentrations, indole is known to have an intense fecal smell.
Therefore, eating foods containing tryptophan, such as turkey or milk, can lead to high indole concentrations in the body, particularly in the feces, resulting in an intense fecal smell.
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Individual differences: indoles are only fecal to some people
The presence of indoles in perfumes is a curious phenomenon that has sparked intriguing discussions among fragrance enthusiasts. While indoles are known to contribute to the scent of certain perfumes, the perception of their fecal nature varies across individuals. This variation in scent interpretation is an intriguing aspect of olfaction and warrants further exploration.
Indoles are chemical compounds that occur naturally in human feces and have an intense fecal smell at high concentrations. Interestingly, when present in very low concentrations, indoles take on a floral scent and are commonly found in white flowers such as orange blossoms. This dual nature of indoles, depending on their concentration, adds an intriguing layer to the understanding of scent and perception.
The perception of indoles as fecal or floral is not universal. Some individuals are highly sensitive to the fecal undertones of indoles, while others may find these fragrances pleasantly floral. This variation in scent interpretation can be attributed to a combination of biological and environmental factors that influence an individual's olfactory perception.
One factor that may contribute to these differences is the complex interplay of scent and memory. Olfactory perception is deeply intertwined with memory formation and retrieval. The scent of indoles may trigger different memories and associations for different people, leading to varying interpretations of the scent as pleasant or unpleasant.
Additionally, cultural and societal factors play a role in shaping scent preferences and perceptions. The association of certain scents with cleanliness or pleasantness can vary across cultures, influencing how individuals perceive and describe the scent of indoles.
Furthermore, the concentration and combination with other aromachemicals in perfumes can also impact their perception. As mentioned earlier, the concentration of indoles can significantly influence their scent. Additionally, the presence of other fragrance compounds can either enhance or mask the fecal undertones of indoles, contributing to the varied perceptions among individuals.
In conclusion, the perception of indoles as fecal is influenced by a multitude of factors, including biological, psychological, cultural, and environmental variables. The intriguing world of scent and perception continues to fascinate fragrance enthusiasts and scientists alike, as they unravel the complex interplay between chemicals, the nose, and the brain.
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Frequently asked questions
Some perfumes contain a chemical called indole, which is found in human feces and has a fecal smell in high concentrations. However, when used in small amounts, it can add a flowery or fruity scent to perfumes.
Indole is a naturally occurring molecule found in some flowers, like orange blossoms and jasmine, which are often used as fragrance notes in perfumes. It is added to enhance the floral or fruity aspects of the scent.
Your most frequent contact with indole is when it is present in your poop. Therefore, your nose is more likely to associate the smell with feces, especially at high concentrations.
Some people have commented that certain perfumes, like Baccarat Rouge 540 and Musc Ravageur by Frederic Malle, have fecal undertones. However, it is important to note that not everyone perceives these scents as fecal.
If you are sensitive to the fecal scent of indole, you may want to avoid perfumes with strong jasmine or oud notes, as these are more likely to contain higher concentrations of indole. Additionally, some cheaper jasmine fragrances may smell less pleasant due to the presence of other aromachemicals.
