Sandalwood oil is an

essential oil An essential oil is a concentrated hydrophobic liquid containing volatile (easily evaporated at normal temperatures) chemical compounds from plants. Essential oils are also known as volatile oils, ethereal oils, aetheroleum, or simply as the o ...

obtained from the

steam distillation Steam distillation is a separation process that consists in distilling water together with other volatile and non-volatile components. The steam from the boiling water carries the vapor of the volatiles to a condenser; both are cooled and re ...

of chips and billets cut from the heartwood of various species of

sandalwood Sandalwood is a class of woods from trees in the genus '' Santalum''. The woods are heavy, yellow, and fine-grained, and, unlike many other aromatic woods, they retain their fragrance for decades. Sandalwood oil is extracted from the woods for ...

trees, mainly ''

Santalum album ''Santalum album'', or Indian sandalwood, is a small tropical tree, and the traditional source of sandalwood oil. It is native to southern India and Southeast Asia. It is considered sacred in some religions like Hinduism, and some cultures plac ...

'' (Indian sandalwood) and ''

Santalum spicatum ''Santalum spicatum'', the Australian sandalwood, also Waang and other names (Noongar) and Dutjahn ( Martu), is a tree native to semi-arid areas at the edge of Southwest Australia, in the state of Western Australia. It is also found in South A ...

'' (Australian sandalwood). Sandalwood oil is used in

perfume Perfume (, ; french: parfum) is a mixture of fragrant essential oils or aroma compounds (fragrances), fixatives and solvents, usually in liquid form, used to give the human body, animals, food, objects, and living-spaces an agreeable scent ...

cosmetics Cosmetics are constituted mixtures of chemical compounds derived from either natural sources, or synthetically created ones. Cosmetics have various purposes. Those designed for personal care and skin care can be used to cleanse or protec ...

, sacred unguents, and as a mild food flavouring.

Main constituents

Sandalwood oil contains more than 90% sesquiterpenic

alcohol Alcohol most commonly refers to: * Alcohol (chemistry), an organic compound in which a hydroxyl group is bound to a carbon atom * Alcohol (drug), an intoxicant found in alcoholic drinks Alcohol may also refer to: Chemicals * Ethanol, one of sev ...

s of which 50–60% is the tricyclic

α-santalol α-Santalol, also referred to as alpha-santalol, is an organic compound that is classified as a sesquiterpene. It comprises about 55% of the oil of sandalwood, another less abundant component being β-santalol. As of 2002, about 60 tons of sa ...

β-Santalol β-Santalol is an organic compound that is classified as a sesquiterpene. It comprises about 20% of the oil of sandalwood, the major component being α-santalol. In 2002, about 60 tons of sandalwood oil were produced by steam distillation of the ...

comprises 20–25%. The composition of the oil will depend on the species, region grown, age of tree, and possibly the season of harvest and details of the extraction process used. Current

International Organization for Standardization The International Organization for Standardization (ISO ) is an international standard development organization composed of representatives from the national standards organizations of member countries. Membership requirements are given in A ...

(ISO) standards for ''S. album'' oil are 41–55% α-santalol and 16–24% β–santalol (ISO 3518: 2002E).

Traditional uses

Due to its highly coveted fragrance, the essential oil produced from sandalwood is often used in

aromatherapy Aromatherapy is based on the usage of aromatic materials including essential oils and other aroma compounds, with claims for improving psychological and physical well-being. It is offered as a complementary therapy or as a form of alternative ...

, and is also added to soaps and cosmetics. It is used in

Ayurvedic Ayurveda () is an alternative medicine system with historical roots in the Indian subcontinent. The theory and practice of Ayurveda is pseudoscientific. Ayurveda is heavily practiced in India and Nepal, where around 80% of the population repo ...

medicine for the treatment of both somatic and mental disorders, including common colds, bronchitis, fever,

urinary tract infection A urinary tract infection (UTI) is an infection that affects part of the urinary tract. When it affects the lower urinary tract it is known as a bladder infection (cystitis) and when it affects the upper urinary tract it is known as a kidne ...

s, and inflammation. A study investigating the effects of inhalation of East Indian sandalwood oil and its main compound, α-santalol, on human physiological parameters found that the compounds elevated pulse rate, skin conductance, and systolic blood pressure. There is also religious significance associated with sandalwood oil and it is used in many different religions around the world, including

Hinduism Hinduism () is an Indian religion or '' dharma'', a religious and universal order or way of life by which followers abide. As a religion, it is the world's third-largest, with over 1.2–1.35 billion followers, or 15–16% of the global p ...

Jainism Jainism ( ), also known as Jain Dharma, is an Indian religion. Jainism traces its spiritual ideas and history through the succession of twenty-four tirthankaras (supreme preachers of ''Dharma''), with the first in the current time cycle bein ...

Buddhism Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and ...

, and

Zoroastrianism Zoroastrianism is an Iranian religion and one of the world's oldest organized faiths, based on the teachings of the Iranian-speaking prophet Zoroaster. It has a dualistic cosmology of good and evil within the framework of a monotheisti ...

Production

The oil is distilled from the wood of the entire tree including stump and roots. Australian sandalwood (''S. spicatum'') is unique in that the white sapwood does not require removal before distilling the oil, while Indian Sandalwood (''S. album'') does require removal of the sapwood prior to distillation.

Fragrance

Sandalwood oil is used extensively for its woody-floral scent. It pairs well with other wood or floral scents such as violet, rose, tuberose, clove, and oakmoss. But since the wood is so rare and expensive, cosmetic companies are now trying to find synthetic substitutes to try to imitate the structure and scent of sandalwood. There are several synthetic

odorants An aroma compound, also known as an odorant, aroma, fragrance or flavoring, is a chemical compound that has a smell or odor. For an individual chemical or class of chemical compounds to impart a smell or fragrance, it must be sufficiently v ...

with odor similar to sandalwood oil, used as lower-cost alternatives for perfumes, emollients, and skin cleaning agents. Common synthetic substitutes include Sandalore, Bacdanlol, Ebanol, Osyrol, and Sandaxol. Two of these, Sandalore and Brahmanol, have been found to be

agonist An agonist is a chemical that activates a receptor to produce a biological response. Receptors are cellular proteins whose activation causes the cell to modify what it is currently doing. In contrast, an antagonist blocks the action of the ag ...

s of the cutaneous

olfactory receptor Olfactory receptors (ORs), also known as odorant receptors, are chemoreceptors expressed in the cell membranes of olfactory receptor neurons and are responsible for the detection of odorants (for example, compounds that have an odor) which give r ...

OR2AT4, with potential therapeutic benefits for wound healing. Natural sandalwood oil, and other synthetic sandalwood odorants, did not have the same effect.New Scientist magazine, Skin’s ability to ‘smell’ seems to help it heal itself, 8 July 2014
/ref>

Safety

There hasn't been extensive research conducted on the safety of sandalwood oil. But because there haven't been any significant adverse effects documented in scientific literature, it continues to be used cosmetically and in food. A few studies were found to identify sandalwood oil's potential toxic effects, but it was determined to be safe at the present levels that the oil is used in food as flavorings.

References