Flour Machine matching equipment includes cleaning equipment, washing equipment, conveying equipment, dust removal equipment, grinding equipment.
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Sample collection and preparation A total of 34 samples were collected, including 15 species of vegetables, 2 species of fruit, 6 species of legumes, and 11 species of cereals. Purchase from a city's grain store, grain store, fruit shop, vegetable store. For vegetables and fruits, edible parts were taken and dried in a blast drying oven below 60°C. The ratio of food and dry foods was also calculated. With the exception of flour, all samples were crushed by iron mills for crude fiber determination. Mesh sieve. Neutral detergent fiber was determined and sieved through a 20 mesh screen.
The content of crude fiber and neutral detergent fiber in dried fruits and vegetables was determined by a fiber tester and ranked according to the percentage of crude fiber and neutral detergent fibers. The crude fiber content of 15 kinds of vegetables was lower than that of neutral detergent fibers. The percentages of crude fiber and neutral detergent fiber content ranged from the highest leucantine 65.63 to the lowest yam 31.60. If the three starch-containing roots and spinach were removed, the percentage of crude fiber and neutral detergent fiber content was within the smaller range of 50.88-65.63.
The concept of crude fiber has been proposed for more than one hundred years and has been widely used. The concept of the current food ingredient table in China is adopted. For more than two decades, foreign countries have conducted extensive research on dietary fiber. In particular, the relationship between dietary fiber and human health has increasingly attracted the attention of scholars from various countries. Dietary fiber and crude fiber are different in meaning, and their content in food is not the same. The determination of crude fiber and neutral detergent fibers (representative of dietary fiber) in common foods by a fiber tester is comparative. It is feasible to compare the two and to try to determine the relationship between the two.
Comparison of Fiber Tester on Determination of Vegetables and Fruits
The fiber analyzer method was established at the beginning of the 19th century. The main process is to use 1.25% acid and 1.25% hydrazine to continuously digest and use its undigested food residue as crude fiber. This method does not completely recover any chemical constituents or entities. Lignin is largely dissolved in the alkaline digestion process, and hemicellulose is largely dissolved during acid and alkali digestion. According to reports in the literature, the crude fiber assay can recover 50% to 80% of cellulose, 20% of hemicellulose, and 10% to 50% of lignin. Neutral detergent fiber assays recover all cellulose, hemicellulose, and lignin. Obviously, the neutral detergent fiber content should be higher than the crude fiber.