Duanmu Shiitake Mushrooms

Duanmu Shiitake Mushrooms

　　Shiitake mushrooms are the world's second most consumed edible fungus and one of China's specialties. In the past decade, China's shiitake mushroom exports have gradually increased, with an annual growth rate of about 2%. Currently, China's annual shiitake production is 80,000 tons, accounting for over 80% of the global 100,000 tons, ranking first in the world, with exports of 36,000 tons, also the highest globally. Japan ranks second and South Korea third. They are distributed across regions in China such as Zhejiang, Fujian, Taiwan, Anhui, Hunan, Hubei, Jiangxi, Sichuan, Guangdong, Guangxi, Hainan, Guizhou, Yunnan, Shaanxi, and Gansu.

　　 Shiitake is a fungus that grows on wood. It has a delicious taste, fragrant aroma, and rich nutrition, often hailed as the "Queen of Vegetables." Shiitake is rich in B vitamins, iron, potassium, vitamin D precursors (which convert to vitamin D upon sun exposure), has a sweet taste, and a neutral nature. It helps treat loss of appetite and fatigue.

　　 Nutritional and Medicinal Value

　　 　　Shiitake is a renowned edible fungus in China, commonly known as a "mountain delicacy" among the people. Analysis shows that the edible portion of dried shiitake constitutes 72%, with each 100g containing 13g water, 1.8g fat, 54g carbohydrates, 7.8g crude fiber, 4.9g ash, 124mg calcium, 415mg phosphorus, 25.3mg iron, 0.07mg vitamin B1, 1.13mg vitamin B2, and 18.9mg niacin. Fresh shiitake, apart from 85–90% water, contains 19.9% crude protein, 4% crude fat, 67% soluble nitrogen-free substances, 7% crude fiber, and 3% ash in its solids. Shiitake is rich in vitamin D precursors but contains very little vitamin C, as well as lacking vitamin A and its precursors. Shiitake polysaccharides can enhance the activity of helper T cells, thereby boosting the body's humoral immune function. Extensive practice has shown that shiitake has a wide range of cancer-fighting applications and is used clinically. Shiitake also contains various vitamins and minerals, playing a significant role in promoting metabolism and improving the body’s adaptability. It also treats conditions such as diabetes, tuberculosis, infectious hepatitis, and neuritis, and can aid in digestion, relieve constipation, and assist in weight loss. Many ancient Chinese texts record shiitake as “benefits qi, alleviates hunger, treats wind-related blood stasis, benefits the stomach, and aids digestion.” Folk remedies use it to promote measles and chickenpox eruptions, treat headaches and dizziness. Modern research proves that shiitake polysaccharides can regulate the activity of T cells with immune functions in the human body, reducing the ability of methylcholanthrene to induce tumors. Shiitake strongly inhibits cancer cells, with a 97.5% inhibition rate against mouse sarcoma 180 and 80% against Ehrlich carcinoma. It also contains double-stranded ribonucleic acid that induces interferon production, providing antiviral capabilities. Shiitake contains water-soluble umami substances usable as food flavorings, mainly composed of nucleic acid components such as 5'-guanylic acid. Its aromatic components mainly come from lentionione generated by the decomposition of shiitake acid. Therefore, shiitake is an important edible, medicinal fungus, and flavoring agent.

　　 　　The umami components of shiitake are a class of water-soluble substances, primarily composed of nucleic acid constituents such as 5′-guanylic acid, 5′-AMP, and 5′-UMP, each making up about 0.1%. Its aromatic components mainly come from lentionione produced by the breakdown of shiitake acid.

　　 　　Shiitake contains an anti-tumor component with a molecular weight of one million—shiitake polysaccharides—and a lipid-lowering component—shiitake ergosterol. It also has shiitake adenine and its derivatives, as well as antiviral components—interferon inducers—double-stranded ribonucleic acid, making it one of the rare health foods. Shiitake is high in unsaturated fatty acids and contains large amounts of ergosterol and fungal sterols that can be converted into vitamin D, which is highly effective in enhancing disease resistance, preventing colds, and treating illnesses. Regular consumption helps prevent rickets caused by disorders in phosphorus and calcium metabolism due to vitamin D deficiency, especially in infants, and prevents various mucosal and skin inflammations. Lentysin in shiitake can prevent arteriosclerosis, lower blood pressure, and shiitake also yields serum cholesterol-lowering components (C8H11O4N5, C9H11O3N5). The ash of shiitake contains large amounts of potassium salts and other mineral elements, making it an ideal food for preventing acidosis. The carbohydrates in shiitake are mostly hemicellulose, primarily consisting of mannitol, trehalose, and mycose, along with glucose, pentosan, and methylpentosan.