Quercetin（117-39-5）

Expectorant: Quercetin is a commonly used expectorant in clinical Chinese medicine. It has good expectorant and antitussive effects, as well as certain antiasthmatic effects, and has pharmacological functions of reducing blood pressure, improving capillary resistance, reducing capillary fragility, lowering blood lipids, expanding coronary artery, and increasing coronary artery blood flow. Clinical quercetin is mainly used for bronchitis and phlegmatic inflammation. It also has an auxiliary treatment effect on patients with coronary heart disease and hypertension. Use this product can cause dry mouth, dizziness and burning sensation in stomach area, which can disappear after stopping the drug. Quercetin is widely found in angiosperms, such as red pipe medicine, cat's eye, iron wrapped gold, rhododendron manshuriensis, loquat, rhododendron rhododendron, rhododendron rhododendron, apocynum, and apocynum venetum. It is a kind of aglycone, which is often combined with sugar in the form of glycosides, such as quercetin, rutin, hyperoside, etc

Efficacy and function: Quercetin, as the most common flavonoid compound, has a variety of biological activities, can resist oxidation, and plays an important role in the clinical treatment of cancer and cardiovascular disease. Antioxidant function Quercetin not only participates in anti-oxidation in vitro, can inhibit DNA oxidative damage, but also can protect tissues from oxidative damage in vivo by reducing the concentration of peroxide in tissues. On the one hand, quercetin can effectively inhibit the production of free radicals. Its flavonoids such as quercetin can significantly reduce the incidence rate of gastric cancer, directly inhibit the growth of cancer cells or may act on the cell transduction pathway of cancer cell proliferation. On the other hand, it can enhance the effect of anticancer drugs and significantly improve the efficacy. The third major role of quercetin in protecting cardiovascular system is to protect cardiovascular system. It is mainly reflected in five aspects: expanding blood vessels and lowering blood pressure; Prevention and treatment of coronary heart disease: Through animal experiments, we also found the function of reducing the incidence and mortality of myocardial infarction and lowering blood sugar; Reduce myocardial hypertrophy; Inhibit the proliferation and hypertrophy of vascular smooth muscle cells; Anti-thrombotic. In addition, quercetin has neuroprotective, anti-inflammatory and antiviral effects. Anti-inflammatory effect: lipopolysaccharide (LPS) can cause immune response and inflammatory reaction of the body when the immune system of the body is fighting against bacterial invasion. Some studies have shown that quercetin has an inhibitory effect on LPS-induced inflammatory response. Antibacterial effect: Quercetin is also a broad-spectrum antibacterial substance, which can be used to prevent and treat various bacterial infectious diseases. Antiviral effect: Quercetin can fight against a variety of viruses, such as HIV, anti-sarcoma virus, human herpes simplex virus, parainfluenza virus type 3 (Pf-3), respiratory syncytial virus (RSV).

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