Lemon [Citrus limon (L.) Burm. f.] is one of the common cultivated varieties of Citrus in Rutaceae, and is cultivated in the United States, Italy, Spain, Greece, Türkiye, Argentina, Brazil, Egypt, Australia, South Africa and other countries. The lemon fruit is not only bright in color and pleasant in aroma, but also rich in vitamins, amino acids, dietary fiber, minerals and other nutrients, as well as flavonoids, essence oil, alkaloids, carotenoids and other bioactive ingredients. These substances not only enable the lemon fruit to have antioxidant, anti-inflammatory, anti-aging, low blood production and other effects, but also have anti-cancer, prevention of diabetes, prevention of hyperlipidemia and other effects, with high nutritional, health and medical values....