Year1
- PH值：
- 7(2%的水溶液)
- 粘度：
- ≥100-1000mpa.s(2%的水溶液)
- 细度：
- 80
Meaning of pregelatinized starch
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Pregelatinized starch is a []
modified starch that is simple to process and widely used. When used, it only needs to be mixed with cold water. Paste, eliminating the trouble of heating and gelatinizing. It is widely used in medicine, food,
cosmetics
feed, oil drilling, metal casting, textile, papermaking and many other industries.
Gelatinization principle of starch
Starch granules swell and split in water to form a uniform paste solution at an appropriate temperature (starch from various sources requires different temperatures, generally ~℃
) The effect is called gelatinization. The essence of gelatinization is the breaking of hydrogen bonds between ordered and disordered (crystalline and amorphous) starch molecules in starch granules, and they are dispersed in water to form a colloidal solution.
The process of gelatinization can be divided into three stages
(
) Reversible water absorption stage, water enters the amorphous part of the starch granules, and the volume expands slightly. At this time, it is cooled and dried, and the granules It can be restored, and the birefringence phenomenon remains unchanged (
) In the irreversible water absorption stage, as the temperature rises, water enters the gaps between starch microcrystals, irreversibly absorbing a large amount of water, and the birefringence phenomenon gradually blurs or even disappears, also known as crystallization
Dissolve
The starch granules swell to ~
times (
) the original volume. The starch granules finally disintegrate and all the starch molecules enter the solution.
Gelatinized starch is also called
starch. The freshly prepared gelatinized starch slurry is dehydrated and dried to obtain an amorphous powder that is easily dispersed in cold water, that is, soluble starch.
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