The white film on top of broccoli is wax powder, also known as wax, which is a protective film produced by the plant itself. The white film is a protective film produced by broccoli itself to prevent pests. It is mainly composed of long-chain saturated fatty acid derivatives, which has the biological function of preventing water loss from non-stomatal pores, the invasion of pests and diseases, and solar radiation. Wax powder is a collective name for the epidermal lipid composition of plant tissues covered in bare air, which is a hydrophobic layer of lipophilic compounds covering the outer epidermal cells of plants, generally greenish-gray, off-white frost.

Broccoli, commonly known as broccoli. Native to Italy, it is a common vegetable. Commonly known as green cauliflower, also known as broccoli. A biennial herb, it is a variety of kale. The leaves are large, and the tips of the main stems form plump flower bulbs, green or purple-green in color, with small buds on the surface that are not crowded together, and small flower bulbs at the tips of each of the lateral branches.

Western bluebells in the nutrients, not only high content, and very comprehensive, mainly including protein, carbohydrates, fat, minerals, vitamin C and carotene. According to analysis, every 100 grams of fresh broccoli flower ball, containing 3.5 grams of protein -4.5 grams, 3 times the cauliflower, 4 times the tomato. In addition, the mineral composition of the broccoli is more comprehensive than other vegetables, calcium, phosphorus, iron, potassium, zinc, manganese and other content is very rich, than the same belongs to the cruciferous family of cabbage flower is much higher.

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