Lance Carson
Agarwood, commonly referred to as oud or oudh, is a fragrant resinous heartwood that is formed in the Aquilaria tree after a fungal infection. The tree defensively secretes a resin to combat the fungal infestation, resulting in a distinct fragrance. Agarwood is highly valued in perfumery and is considered one of the most expensive natural raw materials in the world. The process of extracting oud oil from agarwood is complex and labour-intensive, contributing to its high cost. The oil is distilled from the agarwood through methods such as hydro-distillation, steam distillation, and supercritical CO2 extraction. The scent of agarwood is described as oriental-woody with soft fruity-floral notes, making it a popular ingredient in both traditional and modern perfumes.
| Characteristics | Values |
|---|---|
| Natural Source | Agarwood is a fragrant, dark and resinous wood that forms in the heartwood of Aquilaria trees after they become infected with a type of mold or fungus. |
| Chemical Composition | Over 70 complex chemical compounds, including terpenoids (sesquiterpenes and chromones), agarofurans, cadinanes, eudesmanes, valencanes, and eremophilanes. |
| Extraction Process | Steam distillation is commonly used to extract oud oil from agarwood, with a low yield of approximately 20 ml of oil per 70 kg of wood. |
| Cultural Significance | Agarwood has been used in Arabic, Japanese, and Indian cultures for incense and medicine. It is also mentioned in religious texts such as the Hebrew Bible and the Ayurvedic medicinal text Susruta Samhita. |
| Cost and Availability | Agarwood is rare and expensive due to its labor-intensive extraction process and low yield. The cost of high-quality oud can be up to US$1,000 per gram. |
| Synthetic Alternatives | Due to the high cost and rarity of natural agarwood, synthetic substitutes have been developed. However, these alternatives lack the warm, balsamic, and complex aroma of natural agarwood. |
| Scent Profile | Agarwood's scent is often described as "oriental-woody" and "soft fruity-floral" with notes of vanilla, musk, and amber. It can be blended with other natural perfume ingredients like sandalwood, saffron, and jasmine sambac. |
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What You'll Learn
- Agarwood's fragrant oil is produced by Aquilaria trees when they are infected with a type of mould or physically damaged
- The oil is distilled using hydro-distillation, steam distillation, or super-critical CO2 extraction
- Agarwood is a key ingredient in Arabic perfumery and is now popular in the West
- The scent is described as woody, balsamic, sweet, floral, bitter, spicy, and leathery
- Agarwood is expensive and endangered, with synthetic alternatives being produced
Agarwood's fragrant oil is produced by Aquilaria trees when they are infected with a type of mould or physically damaged
Agarwood, also known as oud, is a fragrant resinous wood that forms in the heartwood of Aquilaria trees. These trees are native to Southeast Asia and South Asia, and their resin has been used for centuries in incense, perfume, and traditional medicine. Agarwood is highly valued for its unique fragrance, which has notes of "oriental-woody" and "very soft fruity-floral".
Agarwood is formed when Aquilaria trees become infected with a type of mould, typically Phaeoacremonium parasitica, or when they are physically damaged. In response to the infection or damage, the tree defensively secretes a resin to combat the fungal infestation and to repair wounded areas. This resin, also known as oud oil, gradually becomes harder and changes the colour of the heartwood from pale beige to yellow, orange, red, or dark brown. The process of agarwood formation can take hundreds of years, and the resulting resinous wood is highly valued for its complex and pleasing fragrance.
The formation of agarwood in Aquilaria trees was once an unsolved mystery, but recent research has made significant progress in understanding this process. It is now known that the production of resin in response to infection or damage is a self-defence mechanism of the tree. By secreting resin, the tree can conceal and repair damages or infections, helping to protect itself from further harm.
The extraction of agarwood oil from the resinous wood is a complex and labour-intensive process, requiring a minimum of 20 kg of low-grade resinous wood to produce just 12 ml of oil. The oil is often distilled using methods such as hydro-distillation, steam distillation, or supercritical CO2 extraction. The composition of agarwood oil is extremely complex, containing more than 150 chemical compounds, including terpenoids, agarofurans, cadinanes, and various aromatic compounds.
Due to the high demand for agarwood and the lengthy process of its formation, the Aquilaria tree has become endangered in many parts of the world. International agreements, such as CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora), have been put in place to protect the tree and ensure sustainable practices in the trade of agarwood products. Despite these efforts, the collection of agarwood from natural forests remains a threat to the survival of the Aquilaria tree.
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The oil is distilled using hydro-distillation, steam distillation, or super-critical CO2 extraction
There are three methods to distil agarwood oil: hydro-distillation, steam distillation, and super-critical CO2 extraction. The first two methods are the most common. The distillation method used can also depend on the age of the tree.
Hydro-Distillation
Hydro-distillation involves soaking agarwood powder in water. The water container is then heated until steam comes out. After cooling, the oil is collected from the top of the hydrosol. The raw materials are in close contact with the water for several days or even months. The water dramatically changes the character of the oil, depending on how long it stays immersed, the type of water, the chemical breakdown of the water, and the salt and mineral content.
Steam Distillation
Steam distillation involves bubbling steam through a heated mixture of the raw material. It is used for compounds that are heat-sensitive and can be employed to isolate essential oils for use in perfumes. Steam distillation can also be used to separate intermediate or final products during the synthesis of complex organic compounds. The agarwood oil is heated to a certain temperature and then separated from the condensed steam. The resultant oil may be impaired by the high temperature.
Super-Critical CO2 Extraction
Super-critical CO2 extraction is seldom used except in large-scale productions. It involves the use of supercritical carbon dioxide to extract the agarwood oil. This method provides a higher yield and better quality of oil.
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Agarwood is a key ingredient in Arabic perfumery and is now popular in the West
Agarwood, commonly referred to as oud or oudh in Arabic, is a fragrant, dark and resinous heartwood that forms in Aquilaria trees after they become infected with a type of mould. The tree defensively secretes a resin to combat the fungal infection, which gradually becomes harder and dark brown to black in colour. This product is harvested and used in perfumes, incense, medicines and small hand carvings. Agarwood oil is distilled from agarwood using steam, with the most common methods of distillation being hydro-distillation and steam distillation. The complex composition of agarwood oil contains more than 150 chemical compounds, with at least 70 of these being terpenoids.
Agarwood is a key ingredient in Arabic perfumery, with oil extracted from agarwood traditionally used in Arabian countries as a perfume. It is also used in colognes, incense and perfumes in Middle Eastern and South Asian cultures, where it is highly prized for its distinctive fragrance. Agarwood is exported in various forms, including wood chips, powder, oil and as finished products such as perfumes, with the main importers being countries in the Middle and Far East, including the United Arab Emirates, Saudi Arabia, Hong Kong, Taiwan and Japan.
The use of agarwood in perfumery is becoming increasingly popular in the West, with sales of oud-based perfumes continuing to grow each year. Many Western perfumers use agarwood essential oil under the name "oud" or "oudh", and it has been described as the "truffle of the fragrance world". To meet the demand for agarwood, many perfumers have started to use a blend of natural and synthetic oud. However, synthetic substitutes do not come close to mimicking the natural product, and the major chemical components responsible for the characteristic scent of agarwood products are very expensive to synthesise.
Agarwood is also significant in Arabic culture and religion, with oud chips burned in mosques and used in religious and festive celebrations. It has been valued for thousands of years across Hindu, Buddhist, Muslim and Chinese cultures, and is mentioned in the Hebrew Bible and the Gospel of John. Agarwood is further referenced in the Ayurvedic medicinal text the Susruta Samhita, where it is described as having various medicinal qualities.
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The scent is described as woody, balsamic, sweet, floral, bitter, spicy, and leathery
Agarwood, commonly referred to as oud or oudh, is a fragrant resinous heartwood that comes from the Aquilaria tree. The tree secretes a resin in response to a fungal or bacterial attack, which gives agarwood its distinct scent. The oil is then extracted from the wood and blended into perfumes.
The scent of agarwood is described as having "oriental-woody" and "soft fruity-floral" notes. Agarwood's essential oil has a complex composition, with over 150 chemical compounds identified, including at least 70 terpenoids and other common compounds such as agarofurans, cadinanes, and eremophilanes. The scent is also characterised by a ""sweet-balsamic" note and "shades of vanilla and musk."
To create a perfume with woody, balsamic, sweet, floral, bitter, spicy, and leathery notes, you can consider the following ingredients:
- Agarwood oil, which provides the woody and balsamic notes, with hints of sweetness and bitterness.
- Guaiac wood, which has a smoky, woody aroma with subtle balsamic undertones and a slightly sweet, leathery, and spicy nuance.
- Oak, which provides an earthy, woody scent with dry and slightly bitter undertones.
- Peru Balsam, which has a sweet olfactory profile with touches of vanilla, cinnamon, and earthy, bitter aspects.
- Styrax balsam, which has an intensely vanilla, floral, and leathery olfactory profile with rich and milky nuances.
- Sandalwood, which has a creamy, smooth, and slightly bitter scent.
- Spices such as cinnamon, nutmeg, or clove leaf can add warmth and a spicy kick to the fragrance.
- Floral notes such as jasmine, gardenia, orchid, or honeysuckle can be added for a sweet and floral bouquet.
- Amber can be included to add a warm, balsamic, and slightly animalic note, as well as a hint of musk.
These ingredients can be blended and adjusted to create a unique fragrance that emphasises the desired notes of woody, balsamic, sweet, floral, bitter, spicy, and leathery scents. It's important to note that the balance of these materials will depend on personal preference and the desired intensity of each note.
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Agarwood is expensive and endangered, with synthetic alternatives being produced
Agarwood, also known as oud, is a highly valuable product with a range of applications, including medicine, fragrance, and religious purposes. The formation of agarwood is associated with the wounding and fungal infection of Aquilaria trees, which secrete a fragrant protective oil into wounded areas. Over time, this oil hardens and becomes a dark brown to black resin. This resin is the highly sought-after agarwood.
Agarwood is expensive due to the low yield of plant material and the labour-intensive extraction process. A large amount of low-grade resinous wood is required to produce a small quantity of oil. For example, a minimum of 20 kg of wood may be needed to produce just 12 ml of oil. The age of the tree also impacts the distillation of the oil, with the highest-quality oud historically derived from trees older than 100 years.
The Aquilaria species is now endangered due to the destructive exploitation of agarwood. The drastic decline in wild populations has led to the genus being listed as an endangered species under CITES regulations. To address this issue and meet market demand, mass cultivation and large-scale plantation of Aquilaria trees have been implemented as a sustainable source of agarwood.
Due to the high cost and endangered status of natural agarwood, synthetic alternatives have been developed. Chemical substitutes are available for use in perfumes, but they do not accurately replicate the characteristic scent of agarwood. The major chemical components responsible for the unique fragrance of agarwood, sesquiterpenes, can be synthesized. However, these structures are complex and expensive to produce, making them commercially unattractive. As a result, perfumers have begun using a blend of natural and synthetic oud to meet the growing demand for oud-based perfumes.
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Frequently asked questions
Agarwood, commonly referred to as oud or oudh, is a fragrant, dark and resinous wood used in incense, perfume, and small hand carvings. It is formed in the heartwood of Aquilaria trees after they become infected with a type of Phaeoacremonium mould, P. parasitica. The tree defensively secretes a resin to combat the fungal infestation.
Agarwood oil is distilled from agarwood using steam. The total yield of oil for 70 kg of wood will not exceed 20 ml. The composition of agarwood oil is complex with more than 150 chemical compounds identified.
Agarwood is described as having a complex and pleasing odour, with few or no similar natural analogues. In the perfume state, the scent is distinguished by a combination of "oriental-woody" and "very soft fruity-floral" notes. The incense smoke is characterised by a "sweet-balsamic" note and "shades of vanilla and musk" and amber.
