Is it citron? Citron (scientific name: Citrus medica L.), also known as citron, is a citrus plant of the Rutaceae family. Citron is the collective name for plant citron and medicinal citron. Plant citron is an evergreen small tree or shrub of the Rutaceae family. It grows in high temperature and humid environments at an altitude of 350 meters to 1750 meters. In the broad-leaved forests of Xishuangbanna, Yunnan, there are citrons in a semi-wild state. The Chinese herbal medicine Citron is the mature fruit of the plant Citron and the same plant Xiangyuan (scientific name: Citrus wilsonii Tanaka). Mainly produced in Zhejiang, Jiangsu, Guangdong, Guangxi and other places. Harvest when the fruits are ripe in autumn. Cut into slices while fresh, remove seeds and pulp, and dry in the sun or at low temperature. It has the effects of regulating qi and widening the middle, reducing swelling and reducing phlegm. In addition, it can be used as rootstock, but it can only be grafted with Buddha's hand and is strictly incompatible with other species. Medicinal name Medicinal name: Citron [3][4] Alias: citron, hook margin dry, fragrant tree, citron citrus citron, fragrant round. [3] The English name is Citron Fruit [3] The medicinal material is derived from the dried and mature fruit of Citrus medica L. or Citrus wilsonii Tanaka. [3][4] Description of medicinal properties Efficacy Classification of Qi-regulating medicine Traditional Chinese medicinal material - Citron (Figure 2) Property and flavor distribution: pungent; bitter; sour; warm. Returns to liver; lung; spleen meridian. Efficacy: Indications: Fullness and tightness in the chest and abdomen; swelling and pain in the flanks and ribs; cough with excessive phlegm. Usage and dosage: Oral administration: decoction, 3-6g; or take into pills or powder. Medication contraindications: People with yin deficiency, blood dryness and pregnant women with qi deficiency should take it with caution. [3] Discussions by various experts: 1. "Supplementary Materials of Materia Medica": Remove qi and phlegm from the heart. 2. "Yinshan Zhengyao": lower the Qi and open the chest and diaphragm. 3. "Compendium of Materia Medica Tongxuan": regulate the qi of the upper Jiao, stop vomiting, eat, and strengthen the spleen. 4. "Ben Jing Feng Yuan": Treats cough and gas congestion. 5. "Yilin Zhuan Yao": Treats epigastric pain, relaxes Qi and relieves depression. 6. "Compendium of Materia Medica": calms the liver and relieves depression, regulates lung qi, stimulates menstruation and diuresis, and treats waist and athlete's foot. 7. "Materia Medica Qiuyuan": Removes chronic wheezing. 8. "Materia Medica Tongxuan": The fragrance is round and neutral in nature. Single use and multiple uses will also damage the healthy energy. There is no harm if used together with ginseng and art. 9. "Benjing Fengyuan": There are two types of citrus: bergamot and citron, with similar nature and flavor, so the "Gangmu" makes no distinction between them. The tangerine is used as a bergamot, and the citron is used as a citron. It also breaks up phlegm. In recent times, it can be used to treat coughs and gas congestion. Use it after removing the pulp core, and there will be no risk of sour harvest. 10. "Compendium of Materia Medica": fragrant round skin, lowers Qi and eliminates phlegm, widens the middle and quickens the diaphragm. Although it is not as warm as orange peel, it is fragrant and dry. People with yin deficiency and blood dryness should still take it away from their ears. Medicinal compatibility 1. Liver stagnation and swelling and pain in the chest and hypochondrium. This product is pungent and can be dispersed, bitter and can relieve pain. It enters the liver meridian to soothe liver qi and relieve pain. To treat liver stagnation, swelling and pain in the chest and hypochondrium, it is often used with Bupleurum, Yujin, and Bergamot. This product has the same effect as Buddha's Hand, but is less effective. [5] 2. Qi stagnation, abdominal distension and pain. The fragrance of this product wakes up the spleen, relieves the pain and relieves pain, and enters the spleen and stomach to promote qi and widen the heart. It is used to treat epigastric and abdominal distension and pain due to stagnation of spleen and stomach qi, belching, acid swallowing, vomiting and aversion to food. It can be used equally with Acosta, Amomum villosum, and Patchouli. [5] 3. Cough due to phlegm and accumulation of phlegm will cause adverse effects on the chest and diaphragm. This product is bitter and dry, reduces diarrhea, resolves phlegm and relieves cough, and its pungent elements travel into the lungs to regulate qi and widen the chest. It is used to treat excessive phlegm, cough, chest tightness, etc. It is often combined with ginger, pinellia, tuckahoe, etc. [5] Pharmacological effects The volatile oil contained in citron has a mild stimulating effect on the gastrointestinal tract, can promote gastrointestinal peristalsis and secretion of digestive juices, eliminate gas accumulation in the intestines, and has an expectorant effect. 1. Anti-inflammatory effect: The hesperidin contained in this product can improve the cell aggregation and capillary resistance in the conjunctiva of the eye caused by the lack of vitamin C in guinea pigs, and can reduce the aggregation of horse blood cells. Feeding rats together with Thrombogenic feed or atherogenic feed can prolong the survival time of rats. It can stimulate the growth rate of guinea pigs lacking vitamin C and increase the content of vitamin C in the adrenal glands, spleen and white blood cells of guinea pigs. 2. Antiviral effect: Before adding hesperidin to vesicular stomatitis virus, pre-incubate mouse fiber cells in 200 μg/ml hesperidin, which can protect the cells from virus attack for about 24 hours. Pretreatment of HeLa cells can prevent influenza virus infection. However, its antiviral activity can be eliminated by hyaluronidase.

3. Other effects: Hesperidin can prevent frostbite and inhibit aldehyde reductase in the lens of rats. Phellodendron has the effect of enhancing the tension and amplitude of isolated rabbit intestines. [