1. Appearance characteristics: The epidermis of high-quality Dendrobium officinale is iron-green, the sheath (i.e., the outermost epidermis) is intact, and there are obvious black nodes. Observed closely, it has distinct segments, short and numerous, and thick, thin at both ends and thick in the middle.

In terms of stem shape, the thicker the stems of Dendrobium officinale, the better. At the same time, high-quality fresh Dendrobium officinale stems are generally shorter rather than longer. In addition, the cross-section of Dendrobium officinale is fresh and tender green, and obvious gum can be seen, with a crystal clear appearance. High-quality fresh dendrobium officinale has little or no fiber itself, so if the fiber can be easily seen from the cross section, it is usually a fake.

2. Taste and texture: Chinese medicine classics record that Dendrobium officinale has a slightly sweet or bland taste and a fresh grassy aroma. When you actually taste Dendrobium officinale, you can still feel the obvious sticky feeling of gum, and even if you chew it for a long time, there is very little residue of Dendrobium officinale. If the Dendrobium officinale purchased by consumers tastes bitter or sour when chewed, or has too little juice and too much residue, it can be concluded that its quality must be poor.

3. Ingredients: Intrinsic ingredients are important indicators for distinguishing the quality of Dendrobium officinale. High-quality Dendrobium officinale requires its branches to contain more active polysaccharides, dendrobium alkaloids and trace elements. Among them, Dendrobium polysaccharide is the main medicinal component of the plant, and its content directly determines the taste and effectiveness of Dendrobium officinale.

Generally speaking, the polysaccharide content of Dendrobium officinale is generally 30%-40%, and the polysaccharide content of the high-quality Dendrobium officinale produced in Guangnan County, Yunnan Province can reach more than 40%. Therefore, it is recommended that when choosing Dendrobium officinale, you must carefully check the quality inspection report, and purchase products with too low polysaccharide content with caution.

4. Heavy metal content and pesticide residues: A small number of dendrobium growers in the upstream link blindly pursue yields and use pesticides, chemical fertilizers and other means to ripen the plants. However, due to the small scale and lack of awareness of standardized operations, dendrobium cultivation is often ignored. The soil and water sources are also not controlled, resulting in the output of Dendrobium officinale pesticide residues and heavy metals exceeding standards, endangering the health of consumers. Mature Dendrobium officinale production companies have recognized the importance of organic and standardized cultivation and have begun to consciously practice this high-standard product system.

Extended information:

The most common way to use Dendrobium officinale is to soak it in water and drink it. The drinking time to maximize the effect of Dendrobium officinale:

1. Moisturize the skin when the environment is dry: the human body will lose at least 0.5 liters of water from the skin surface every day, especially in autumn and winter or dry and windy weather It is more likely that there will be up to 1 liter of water loss in the environment.

As a result, the skin is prone to dehydration and the formation of fine wrinkles. Many people tend to only pay attention to external cosmetics. In fact, hydration requires both internal and external care. Drinking more dendrobium officinale tea can moisturize and moisturize the skin, making the skin supple and supple.

2. It can promote metabolism when you have a fever: When you have a fever, the human body cools down itself out of a self-protective response. At this time, there will be symptoms of accelerated metabolism such as sweating, shortness of breath, and increased evaporation of water from the skin. Drinking more Dendrobium officinale water can not only promote sweating and urination, but also help regulate body temperature and replenish body nutrition, promoting the rapid excretion of bacteria and viruses in the body.

3. Drinking and smoking can strengthen the liver’s excretion of sewage: Dendrobium officinale is rich in polysaccharides. After consumption, it creates a protective film in the stomach, which reduces the damage of alcohol to the stomach and enhances the metabolic function of the liver. , through reconciliation in the body, the nature of alcohol is resolved, reducing the harm to the body caused by drinking too much alcohol and avoiding drunkenness; long-term smokers have a large amount of waste deposited in the lungs, and drinking Dendrobium officinale tea can soften the long-term attached waste in the trachea and cough it up.

People's Daily Online-Four tips to identify true and false Dendrobium officinale