Limonene: Limonene has been studied for the anti-tumour effect
noticed in mice. Herbalists often prescribe herbs with this constituent as an
antioxidant and cancer or tumour inhibitor although there is evidence that these
properties are volatile and may be lost as a result of processing of the herb.
Limonene also has antiviral properties.
Citronellal and Citronellol: Citronellal a Terpene Aldehyde and
Citronellol a Terpene Alcohol. Fragrant and regarded as highly valued oil in
aromatherapy and the perfume industry. Terpene alcohols are antimicrobial but
are a lot gentler on the skin than the phenols. Citronellal from Citronella
grass has a more pungent smell and is less gentle on skin. Aldehydes are
sedative, antiviral and antimicrobial but can be an irritant to the skin.
Citral: A Monoterpene Aldehyde consisting of isomers geranial
and neral which combined are known as Citral.
Citral has sedative,
antiviral and antibacterial effects.
Aldehydes: Aldehydes are a class of highly reactive chemical
compounds that are intermediate between acids and alcohols, containing less
hydrogen than alcohols and less oxygen than acids.
Aldehydes are mostly irritants and can cause skin
irritation in even when diluted. Monoterpene Aldehydes are geranial,
citronellal, citral (which is responsible for the sharp distinctive citric
smell) while Cyclic Aldehydes are also known as aromatic Aldehydes have far more
cloying and sweet smells like Cinnamic Aldehyde and Benzaldehyde, which are
Cyclic Aldehydes, widely used in the perfume industry.
If ingested aldehydes are very irritant to the gastrointestinal tract, causing
nausea and diarrhoea.
For further detail see specific aldehydes: