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Perhaps the most significant effect of broccoli is to prevent and fight cancer. Broccoli contains more vitamin C than Chinese cabbage, tomato and celery, especially in the prevention and treatment of gastric cancer and breast cancer. Research has shown that when suffering from gastric cancer, the level of selenium in the human serum significantly decreases, and the concentration of vitamin C in gastric juice is also significantly lower than that of normal people. Broccoli not only provides a certain amount of selenium and vitamin C, but also provides rich carotenoids, which play a role in preventing the formation of precancerous cells and inhibiting the growth of cancer. According to the research of American nutritionists, there are many indole derivatives in broccoli, which can reduce the estrogen level in human body and prevent the occurrence of breast cancer. In addition, research has shown that an enzyme extracted from broccoli can prevent cancer. This substance, called sulforaphane, has the effect of increasing the activity of carcinogenic detoxifying enzymes.

The antioxidant effect of broccoli extract shows a strong ability to scavenge DPPH free radicals, indicating that broccoli contains antioxidant substances that can scavenge hydroxyl, alkyl, or peroxy free radicals. It can also block lipid peroxidation chain reactions, and the ability to scavenge DPPH free radicals is positively correlated with the amount of broccoli extract. The water soluble extract of broccoli has a stronger ability to scavenge DPPH free radicals than the fat soluble extract, indicating that broccoli contains various polar antioxidant substances.

Other effects: Broccoli also contains rich anti blood acids, so eating more broccoli can not only prevent cancer, but also enhance the detoxification ability of the liver and improve immunity. The high fiber can effectively reduce the absorption of glucose by the stomach, reduce blood sugar, and effectively control the condition of diabetes. Broccoli not only has preventive and regulatory effects on heart disease and hypertension, but also can prevent eye diseases. For pregnant women, eating more broccoli is very beneficial because its Chemicalbook contains rich folic acid, which plays an important role in fetal growth and development. In addition, eating broccoli frequently can enhance memory.

Extraction process of broccoli polysaccharides: Broccoli → drying, crushing → degreasing, decolorization → ultrasonic extraction → filtration and residue removal → vacuum concentration → alcohol precipitation → drying → weighing 100g of broccoli polysaccharides and drying them to constant weight in a drying oven. After crushing, they are sieved through an 80 mesh sieve. Degrease with petroleum ether in a ratio of 1:3 to liquid, and remove monosaccharides, oligosaccharides, and pigments with 80% ethanol. Repeat the operation three times. After drying at 65 ℃, different material liquid ratios, extraction times, and ultrasonic power were designed for ultrasonic extraction. The extraction solution was centrifuged at 4000r/min for 10 minutes. Then, the dialysate was concentrated under reduced pressure using a rotary evaporator and dialyzed for 24 hours. 95% ethanol was added to the dialysate to achieve an ethanol concentration of 80%. The dialysate was left to stand overnight, filtered, and the solid was washed with anhydrous ethanol, petroleum ether, and acetone. After drying, refined polysaccharides from broccoli were obtained.