Also known as rice bran and small rice bran. The skin attached to the outside of rice grains of rice and millet is called rice bran after removal, which is a by-product after rice is processed into rice. However, according to different processing technologies, rice bran can be divided into several types.
Fine chaff is composed of seed coat, aleurone layer, embryo and a small amount of endosperm, with high fat content, easy rancidity and difficult preservation. The traditional rice mill is called coarse rice bran or coarse rice bran, and the separation is not obvious because of the rough process. This coarse rice bran contains broken rice husk, broken rice and rice husk.
The separated rice husk is ground into powder by machine, called chaff, which is mainly crude fiber and lignin. The digestibility is very low, the digestible protein is negative, and it is pure roughage.
Fine bran component
Oil contains triterpene fenvalerate, commonly known as oryzanol. These include ferulic acid esters such as luteolin, 24- methyl luteolin, luteolin, cholesterol, trimethylsterol, dihydro-γ-sitosterol, dihydro-β-sitosterol, β-sitosterol, campesterol, stigmasterol and 24- methylene luteolin.
It also contains glycerides such as triglycerides, diglycerides and monoglycerides and free fatty acids, of which palmitic acid accounts for about 50%, squalene, ferulic acid, sterols, higher fatty alcohols, hydrocarbons, phospholipids, lipoproteins, vitamins B 16, B 1 and E groups.