Amorphophallus commercial taro bulb is the main part of industrial deep processing and utilization. The fresh bulb of Amorphophallus konjac contains a lot of water, generally about 80%, and the dry matter content is about 20%. The main components of dry matter are carbohydrates (mainly glucomannan and starch), cellulose, hemicellulose, soluble sugar and so on. , and a small amount of protein, amino acids, enzymes, fats, alkaloids, inorganic salts and other special substances.

1. Moisture: The fresh bulbs of konjac generally contain 75%-90% moisture, which varies with varieties, cultivation environment, harvesting time, bulb size and taro age. The water content of Japanese varieties is lower than that of China. Where the air humidity and soil water content are high in the cultivation area, the water content of the planted konjac bulbs is high, and vice versa; The water content of early excavation is higher than that of late excavation; The water content of large bulbs is higher than that of small bulbs. The water content of bulbs in taro year is higher than that in taro year, and the dry matter content of bulbs with high water content is relatively low.

Second, the dry matter content of carbohydrates is glucomannan. The content of glucomannan in konjac dry matter is very high, generally above 50%. Konjac is the only major cash crop in nature that contains this substance in large quantities. Konjac glucomannan is a kind of high quality dietary fiber. It is a macromolecular polysaccharide with a molecular weight of 200,000-2 million Daltons. The glucomannan content of different konjac varieties varies greatly, and varies with the variety, origin, altitude, processing method and storage time of raw materials. For example, flower konjac and white konjac in China contain 50%-60% glucomannan; Tianyang Amorphophallus and Ximeng Amorphophallus contain nearly 50% glucomannan; Youle konjac contains 33.7% glucomannan; The konjac in Menghai contains 39.8% glucomannan.

Third, the starch contained in dry matter, the starch content in konjac bulbs is negatively correlated with glucomannan, and high starch content leads to low glucomannan content, and vice versa. In China, the bulbs of Amorphophallus heterophylla and Amorphophallus albus used in production contain a small amount of starch. Generally speaking, the starch content of konjac is between 12%-20, and the starch content of konjac is about 1 1%.

4. Cellulose and hemicellulose in konjac dry matter. Cellulose and hemicellulose are the main components of the cell wall, and there are specialized cellulose fiber cells in the bulb. With the increase of bulb age, the cellulose content of konjac increased. Generally, the dry weight of konjac bulbs contains 2%-5% cellulose. The soluble sugars contained in konjac bulbs are sucrose, fructose, glucose, etc., and their contents vary with different varieties. Generally, the content of white konjac is about 1.5% (dry weight), and the content of flower konjac is about 3%.

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