Shiuli VOC

 Biology of the Smell of Shiuli (Night-flowering Jasmine)

The sweet smell of the Shiuli flower (Nyctanthes arbor-tristis) is caused by natural chemical compounds called volatile organic compounds (VOCs). These chemicals evaporate easily into the air and reach our nose, where they stimulate smell receptors.

1. Why does Shiuli smell so sweet?

• Essential oils and fragrance compounds: The flowers release volatile chemicals that create their characteristic fragrance. These may include compounds from the terpenoid and benzenoid groups.
• Night-time fragrance: Shiuli flowers usually open at night and release fragrance that can help attract nocturnal pollinators, including moths.
• Pollination: The scent acts as a chemical signal, helping pollinators locate the flowers.
• Biological rhythm: Flower opening and fragrance release are influenced by the plant’s internal biological clock and environmental conditions.

2. How does the smell reach our brain?

Shiuli flower releases fragrance molecules

Molecules enter the nose

Olfactory receptors are activated

Brain identifies the floral smell

3. Why is the smell stronger at night?

Shiuli’s night-time flowering pattern is associated with nocturnal pollination. Its fragrance may be more noticeable at night because of changes in fragrance release, temperature, humidity, and air movement. The exact fragrance-release pattern depends on environmental conditions.

In short: Shiuli’s beautiful smell is a result of volatile fragrance molecules produced by the flower, which serve as chemical signals for pollinators and are detected by the human olfactory system.