My friend will be happy to answer your question.

1. Crude Fiber Food Crude Fiber (CF) Crude fiber is the main component of plant cell walls, including cellulose, hemicellulose, lignin and cutin. The crude fiber measured by conventional feed analysis methods is the remaining insoluble carbohydrates after boiling the feed sample with 1.25% dilute acid and 1.25% dilute alkali for 30 minutes each. Among them, cellulose is a homogeneous polysaccharide polymerized by β-1,4 glucose; hemicellulose is a heterogeneous polysaccharide polymerized by glucose, fructose, xylose, mannose and arabinose; lignin is a A polymer of phenylpropyl derivatives, it is the main limiting factor in the utilization of various nutrients by animals. During the analysis process of this method, some hemicellulose, cellulose and lignin are dissolved in acid and alkali, which makes the measured crude fiber content low and increases the calculation error of nitrogen-free leachate. In order to improve the crude fiber analysis scheme, Van Soest (1976) proposed the use of neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (Acid Detergent Lignin). ADL) as an indicator for evaluating fiber substances in forage! At the same time, all hemicellulose, cellulose and lignin in the feed crude fiber are separated, which can better evaluate the nutritional value of the feed crude fiber.

In addition, crude fiber cannot be digested and absorbed by the human body. Before 1970, there was only the term "crude fiber" in nutrition, which was used to describe food residues that cannot be digested and absorbed, and only included part of cellulose and lignin. It is generally believed that crude fiber has no nutritional effect on the human body. Even eating too much will affect the body's absorption of nutrients in food, especially trace elements, which is harmful to the body and has not been taken seriously. Since then, through a series of investigations and studies, it has been realized that those "non-nutritional" substances that cannot be digested and absorbed by the human body are closely related to human health and play an important role in preventing certain human diseases such as coronary heart disease, diabetes, colon cancer and constipation. At the same time, it was also recognized that the concept of "crude fiber" was no longer applicable, so it was abandoned and replaced by dietary fiber.

Foods containing dietary fiber mainly include grains, vegetables, fruits, beans, etc. Among them, it is divided into soluble dietary fiber and insoluble dietary fiber. The former include pectin, gum and viscose, which are soluble in water and mainly found in fruits, oats, barley and some beans. Most dietary fibers are insoluble, such as cellulose and hemicellulose. Most crude fiber foods on the market are added with coarse grains and miscellaneous grains containing this type of insoluble dietary fiber, such as corn, wheat bran, rice bran, etc. Crude fiber contains less nutrients and is not easy to digest, but it can play a certain preventive and therapeutic role in obesity, hyperlipidemia, diabetes and other diseases.

2 Category Edit

Crude fiber foods refer to foods containing more than 2 grams of crude fiber per 100 grams of food.

Beans

There are miscellaneous grains such as corn,

millet, sorghum, buckwheat, oats, cassava, sweet potato, bamboo potato, soybean, green bean, mung bean, adzuki bean , black beans, peas, cowpeas, broad beans, red dates, millet seeds, walnuts, peanuts. Soybeans

Vegetables

Soybean sprouts, celery, leeks, garlic sprouts, day lilies, Chinese toon, green peppers , edamame, water bamboo shoots, bamboo shoots, whip shoots, asparagus, onions, mustard greens, bean sprouts, mung bean sprouts, coriander, eggplant, kelp, seaweed, nostoc, seaweed, etc.

Fruits

Apples, pears, grapes, apricots, persimmons, hawthorns, strawberries, pineapples, preserved fruits, dried apricots, prunes, olives, etc.

Lemons, apples and oranges

Fungi

Agaric, mushrooms, shiitake mushrooms, enoki mushrooms, etc. As well as some coarse grains, etc.

From Baidu Encyclopedia. I hope it helps you.