(Ach. ex Pers.) Pilát (1942)
Boletus obliquus Ach. ex Pers. (1801)
Inonotus obliquus, commonly known as chaga mushroom (a Latinisation of the Russian term 'чага'), is a fungus in Hymenochaetaceae family. It is parasitic on birch and other trees. The sterile conk is irregularly formed and has the appearance of burnt charcoal. It is not the fruiting body of the fungus, but a mass of mycelium, mostly black due to the presence of massive amounts of melanin. The fertile fruiting body can be found very rarely as a resupinate (crustose) fungus on or near the clinker, usually appearing after the host tree is dead. I. obliquus grows in birch forests of Russia, Korea, Eastern and Northern Europe, northern areas of the United States, in the North Carolina mountains and in Canada.
The chaga mushroom is considered a medicinal mushroom in Russian and Eastern European folk medicine and research on its medicinal potential is ongoing. However there is currently no evidence for its effectiveness or safety for medicinal use.
The name chaga (pronounced "tsjaa-ga") comes from the Russian word of the mushroom (anglicized from czaga), which in turn is purportedly derived from the word for the fungus in Komi-Permyak, the language of the indigenous peoples in the Kama River Basin, west of the Ural Mountains. It is also known as the clinker polypore, cinder conk, black mass and birch canker polypore.
In Norwegian, the name is kreftkjuke' which literally translates as "cancer polypore", referring to the fungus' appearance or to its alleged medicinal properties. In Finnish, the name is pakurikääpä, combined from pahkura and kääpä translating as "wart polypore".
In England and Canada, it is known as the sterile conk trunk rot of birch, which refers to the fruiting bodies growing under the outer layers of wood surrounding the sterile conk once the tree is dead, to spread the spores. In France, it is called the carie blanche spongieuse de bouleau (spongy white birch tree rot), and in Germany it is known as Schiefer Schillerporling (slate Inonotus). The Dutch name is berkenweerschijnzwam (birch glow mushroom).
Chaga has been used as a folk remedy in Russia and Siberia since the 16th century. According to the Memorial Sloan–Kettering Cancer Center, "no clinical trials have been conducted to assess chaga's safety and efficacy for disease prevention or for the treatment of cancer, cardiovascular disease, or diabetes". They caution that the mushroom extract can interact with other drugs.
Chemical analysis shows that chaga mushroom contains a range of secondary metabolites, including phenolic compounds such as melanins, and lanostane-type triterpenes, which include a small percentage of betulinic acid.
Geographically this fungus is mostly found in very cold habitats. It grows very slowly, suggesting it is not a reliable source of bioactive compounds in the long run. Attempts at cultivating this fungus all resulted in a reduced and markedly different production of bioactive metabolites. Secondary metabolites were either absent or present in very different ratios, and in general showed significantly less potency in cultivated Chaga. Cultivated Chaga furthermore results in a reduced diversity of phytosterols, particularly lanosterol, an intermediate in the synthesis of ergosterol and lanostane-type triterpenes. This effect was partially reversed by the addition of silver ion, an inhibitor of ergosterol biosynthesis.
Additionally, the bioactive triterpene betulinic acid is completely absent in cultivated Chaga. In nature Chaga grows pre-dominantly on birches, and birch bark contains up to 22% of betulin. Betulin is poorly absorbed by humans, even when taken intravenously; its bioavailability is very limited. However, the Chaga mushroom converts betulin into betulinic acid, and many internet sources state Chaga's betulinic acid is bioavailable, even when taken orally. Unfortunately there is no research that confirms this claim.
Chaga dietary supplements
In China, Japan and South Korea, extracts of chaga and other mushrooms from the family Hymenochaetaceae are being produced, sold and exported as anticancer medicinal supplements. The main bioactive ingredient in these extracts are usually (1>3)(1>6) Beta-D-glucans, a type of water-soluble polysaccharide. The biologic properties of crude preparations of these specific β-D-glucans have been subject of research since the 1960s.
Russian literature Nobel Prize laureate Alexandr Solzhenitsyn wrote two pages on the medicinal use and value of chaga in his autobiographical novel, based on his experiences in a hospital in Tashkent, Cancer Ward (1968).
Chaga is traditionally grated into a fine powder and used to brew a beverage resembling coffee or tea. For medicinal use, an extraction process is needed to make at least some of the bio-active components bioavailable. These bio-actives are found in the mostly indigestible chitin cell walls of the chaga. Humans lack the enzyme chitinase, so cannot fully digest raw mushrooms or their derivatives, and the digestive process works too fast for the stomach acid to take effect. Scientific studies and research are in general also based on highly concentrated extracts, and traditional Russian usage is also based on a form of hot-water extraction (by preparing zavarka).
Currently, three extraction processes are used, each with a different outcome.
- Hot water extraction is the most common and the cheapest method. It can be compared to the traditional tea-making process. All water-soluble components will be present in the resulting extract. Water-insoluble components, such as phytosterols, betulinic acid and betulin, will be absent. Several extraction rounds combined with modern pharmaceutical techniques can result in high levels of polysaccharides, up to almost 60%. The ß-D-glucans, the bio-active part of these polysaccharides, might add up to ±20 %. Polyphenolic components are water-solubles and will also be present.
- Ethanol or methanol extraction isolates the water-insoluble components, betulinic acid, betulin and the phytosterols. This extraction process is in general used as a second step after hot-water extraction, since ethanol alone will not break down chitin effectively - heat is essential.
- Fermentation is the most time-consuming, so is the most expensive; this method is not used very often. Because fermentation methods are not standardized (many types of bacteria and fungi can be used in the process), the outcome is also not standardized.
Extracts with a therapeutic value usually combine two methods, usually hot water and ethanol extraction. This will result in all bioactive components being present. Cheap, mass-produced extracts are in general hot water, low percentage (4-20%) polysaccharide extracts with limited therapeutic value. The information on the supplements' label will usually reveal inclusion or exclusion of components. However, the majority of mushroom dietary supplements that are sold are non-extracted, being the cheapest option. To achieve at least some therapeutic effects the consumer has to make a tea from it.
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