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Citral

physical science Maturity 11-13 Next article →

Citral is a special part of plant oils. It has a strong scent like lemons. Scientists call it an acyclic monoterpene aldehyde. This is a long name for a specific type of molecule. Citral is made of two isoprene units. It is a very useful part of nature.

Many things in our world rely on it.

Citral is actually a mix of two different things. These two things are called isomers. One version is called geranial or citral A. The other version is called neral or citral B. They do not always appear in equal amounts. In Australian ginger oil, the ratio is 0.61. Geranial smells like citrus and lemon. Neral has a less sweet lemon scent.

Nature provides citral in many different ways. It is found in the volatile oils of several plants. One very important source is an Australian tree. This tree is named Backhousia citriodora. It belongs to a plant family called Myrtaceae. This tree is considered a superior source of citral.

People look to this tree to find the best citral.

Humans use citral for many important jobs. It is a precursor for making vitamins. This means it is a starting material. It helps make vitamin A and vitamin E. It also helps make vitamin K. It can help make lycopene and ionone too. In 2016, tests showed it could fight a germ called Cronobacter sakazakii.

You might smell citral in your daily life. It is an aroma compound used in perfume. It makes lemon oil smell fresh and juicy. It can even smell like green lemon peel. Some plants use it to talk to bugs. It has pheromonal effects on certain insects. The herb Cymbopogon citratus can even stop pests.

This makes it a very helpful tool in nature.

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