Herbs & Spices Chemical Compounds
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[Now available to purchase as herb/spice jar labels here!]

It’s often stated that cooking is much like chemistry, or vice versa. I thought it’d be fun to take that a little further, and look at the major organic compounds present in various different herbs and spices that are frequently used in cooking, so that’s what this poster tries to do. Obviously, each herb or spice owes its precise flavour to the complex mix of organic compounds it is composed of, rather than one simple compound that can be isolated – however, some compounds contribute more than others, and it is these that I’ve tried to focus on here.

The majority of the compounds I’ve selected have been chosen because they are the major compound present in that particular herb or spice. In a select few cases, however, I’ve selected one that isn’t the major compound; in these cases, this is because the compound chosen is a major contributor to either the aroma, flavour or colour of the spice in question. I’ve tried to provide a brief overview for each spice in the text below.


Estragole is an isomer of anethole, the compound found in anise. Basil oil contains a large quantity of estragole, along with the compound linalool. It is also found in herbal medicinal products.

Bay Leaves

1,8-cineole is the major constituent, a compound also found in cardamoms. Its common name is eucalyptol, the major compound found in eucalyptus oil. Eucalyptol is an ingredient added to cigarettes and is also found in many brands of mouthwash.


Carvone, the major compound in caraway, actually has two mirror image isomers, one of which smells like caraway, the other of which smells like spearmint. Only S-carvone, the isomer smelling of caraway, is found in caraway seeds.


1,8-cineole is the major compound found in small cardamoms. The cardamom aroma is caused by the combination of this compound and another compound, alpha-terpinyl acetate.


Capsaicin is the major compound present in chilli peppers and gives them their spiciness. You can read more about capsaicin in the previous Chemistry of a Chilli post.


Similarly to onions and garlic, sulfur containing organic compounds give chives their flavour. One of the major contributors in chives is dipropyl disulfide.


Eugenol is one of the main compounds found in cloves. More minor constituents are also contributors to the characteristic odour, for example compounds such as methylamylketone and methylsalicylate. Eugenol is named after the scientific name for cloves, and along with its derivative compounds is used in perfumery & flavourings.


Cinnamaldehyde gives cinnamon its flavour and odour; 90% of the oil obtained from cinnamon bark is cinnamaldehyde. It is also used as a flavouring in chewing gum, sweets, ice cream and beverages.

Coriander Leaves

Once of the main components of cinnamon leaf oil extract is 2-decenoic acid. The composition also includes many different aldehydes, primarily those of 9-10 carbons in length. You can read more about the chemistry of coriander on the previous post on the site.

Coriander Seeds

The main compound in coriander seeds is linalool. It has two mirror image isomers, one of which is known as coriandrol. The other mirror image isomer is found in lavender and sweet basil.


Cuminaldehyde is the main contributor to cumin’s warm aroma. Other constituents include a range of other aldehyde compounds.


Carvone, already mentioned for caraway, is also one of the main compounds found in dill. The spearmint isomer of carvone is used in the manufacture of chewing gum – spearmint chewing gum is produced by being soaked in carvone.


Zingiberene is the major organic compound in ginger. The pungency of ginger is caused by a range of compounds called gingerols.


Citral is a mix of two different isomeric aldehydes, neral and geranial. Citral is also used in perfumery for its citrus odour.


Mace’s chemical composition is similar to that of nutmeg, as they are both obtained from the same plant. The compound of the highest concentration in the essential oil of mace is terpinen-4-ol. It is also found in the essential oil of the tea tree.


Sabinene hydrate is the main component of the extracted oil of marjoram, and is responsible, along with other compounds of the terpene family, for the characteristic flavour of the herb.


The major compound in mint leaves is menthol. This compound is also a popular flavouring for chewing gum and toothpaste, and is also used in menthol cigarettes.


Sabinene is one of the major constituents of the essential oil of nutmeg. Another compound found in nutmeg is myristicin, which can cause hallucinogenic effects in large amounts.


Carvacrol is responsible for the warm, pungent odour of oregano. It is also found in tequila, and the oil of thyme.


Capsanthin is one of the compounds that contributes towards the red-orange colour of paprika, as well as the compound capsorubin. These two compounds increase in concentration during the advanced stages of ripeness of peppers, increasing the intensity of their red colour.


1,3,8-p-menthatriene is the major compound found in parsley leaves. Other compounds include myristicin & limonene.


Piperine is the major constituent of the oil that can be extracted from black pepper, and is the main compound that gives black pepper its pungency. An isomer of piperine, chavicine, also contributes.


Alpha-pinene is found in many species of coniferous trees, notably the pine tree, as well as being one of the major compounds in rosemary. Along with other members of the monoterpene family of compounds, it is emitted in large amounts by vegetation.


Crocin is the chemical compound responsible for the colour of saffron. It is a deep red colour, and forms an orange solution when dissolved in water. It has been shown to be a potent anti-oxidant.


Manool is one of the main chemical compounds found in sage. Others include eucalyptol, and thujone, a psychoactive compound.

Star Anise

80-90% of the essential oil extract of star anise is anethole. This can be isolated and used to flavour liqueurs such as sambuca, as well as liquorice sweets.


Estragole is an isomer of anethole, and is found in tarragon as well as basil. Estragole is suspected to be carcinogenic and genotoxic, but only at levels 100-1000 times the expected human exposure to the compound.


Thymol is the compound that provides the distinct flavour of thyme. It is also used as one of many additives in cigarettes.


Compounds called curcuminoids are responsible for the yellow colouration of turmeric. They are also natural antioxidants. As a food additive, curcumin’s E number is E100.


The aroma of vanilla is mainly due to the compound vanillin, which accounts for 74-96% of the flavour & aroma compounds. Over 100 other volatile compounds have been detected, including acids, phenolic compounds, alcohols and aldehydes.

You can download the graphic as an A3 PDF here.

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References & Further Reading

20 CommentsClose Comments


  • stephen
    Posted March 27, 2014 at 3:30 pm 0Likes

    I never knew coriander seeds had linaloo in! You learn something new everyday 🙂

  • Marty
    Posted April 2, 2014 at 2:10 pm 0Likes

    Really informative about a wonderful range of delicious herbs and spices, thanks for this 🙂

  • Arantzazu Blanco
    Posted May 30, 2014 at 12:29 pm 0Likes

    What do the colours mean??

    • Compound Interest
      Posted May 31, 2014 at 10:41 am 0Likes

      The colour system is just one commonly used in UK supermarkets – green is for herbs, orange is for spices (or, to be honest, anything that isn’t herbs). The redder ones are just me taking a bit of artistic license, for the sake of having an extra colour thrown in, and because I thought the compounds present in peppers should get their own colour!

      This has come up a few times actually – I guess maybe this system of colour coding herbs & spices isn’t as commonplace outside the UK?

      • Arantzazu Blanco
        Posted May 31, 2014 at 12:20 pm 0Likes

        I am in Spain. You actually made me go to the kitchen to check! In the supermarket I go to, green is for herbs and red is for spices; black is for salt. I thought, however, it had to do with chemistry, I mean, any other properties of those compounds. Thanks for your answer! I really like your blog and share the post in my social networks.

        • Compound Interest
          Posted June 1, 2014 at 4:35 pm 0Likes

          No problem, glad you’re enjoying the posts! Interesting that salt’s black in Spain – that’s usually used for pepper here (that, or blue, bizarrely).

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  • Mark Webb
    Posted March 15, 2015 at 11:41 pm 0Likes

    Citral is made up of neral & geranial… not lemonal, no such animal…

    • Compound Interest
      Posted March 15, 2015 at 11:53 pm 0Likes

      Good spot on the error there – lemonal is actually another, infrequently used name for citral, but I definitely meant neral. Fixed now!

  • Tony Meadowcroft
    Posted June 20, 2015 at 1:12 pm 0Likes

    Hi, We love these and bought a set, we’re looking to expand to make labels for other herbs, spices and mixes. Can I ask for the name of the font used, as I’d love for them to match the theme.

  • Enrico Uva
    Posted July 21, 2015 at 1:07 pm 0Likes

    As you know, chemical composition in natural products is quite varied in response to environment and evolution. A chemotype of the same species of rosemary for instance can have 1,8-cineole(eucalyptol) as its main component and not alpha-pinene. Recently another ecotype was found. See http://uvachemistry.com/2015/07/20/the-dew-of-the-sea/

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