Sep 11, 2019
The Usnea lichens are found in more than 600 species around the world. The Usnea lichens are nearly 90 species in China. They are mainly distributed in Guangxi, Inner Mongolia, Jilin, Heilongjiang, Sichuan, Yunnan, Tibet, Shaanxi and other provinces. It is mainly distributed in the northern hemisphere. Usnea is a traditional medicine， which used in Chinese, Mongolian, Tibetan and Victorian. Let's look at Usnea lichens use.
But why does Usnea lichens use?
There are some chemical composition in Usnea lichens. Such as, multi-substituted monophenyl ring compounds, depsipeptides and their derivatives, terpenoids and their derivatives, fatty acids and their derivatives, polysaccharide and so on.
And how many pharmacological effects does Usnea lichens have?
2.1 Antibacterial, insecticidal effect
The Usnea genus has been widely used in the treatment of antibacterial and insecticidal diseases for a long time. A large number of studies carried out in modern times. And studies have further confirmed the antibacterial effect of lichens. The antibacterial and insecticidal ingredients are usnic acid and phenolic. They have a certain effect on trauma, suppurative trauma, mild burns, burns, athlete's foot puerperal and cervical erosion and so on. It not only have a strong killing effect on protozoa, but also inhibit tubercle bacilli effect.
2.2 Antioxidant effect
The Usnea has anti-oxidation effect. Bian Xiaoli and other studies have shown that the polysaccharides of long-snacked radix are clearly clear to hydroxyl radicals.
2.3 Antipyretic and analgesic effect
Okuyama and other researchers studied the extraction of usnic acid and difficile lignin from the stalk. And they determined the analgesic effect on mice by writhing and tailing, and observed the normal body temperature and LPS induction in mice. The effects of hyperthermia indicate that these two compounds are active ingredients for antipyretic and analgesic effects.
2.4 Other effects
Longissima Ach., he extract methanol. It has antiplatelet and antithrombotic activity. It has also been reported that long-snack polysaccharides have significantly enhanced humoral and cellular immune functions in mice.
Usnea has a long history in traditional medicine. The genus of Usnea is an important medicinal resource. Domestic and foreign scholars have studied and reported on the chemical constituents and pharmacological activities of some species of genus. They confirmed its reality, it has little research on many medicinal mechanisms and needs to be further explored and expanded.