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Hydroxypropyl-beta-cyclodextrin(β -cyclodextrin, 2-hydroxypropyl ether) is a partially substituted poly(hydroxypropyl) ether of betacyclodextrin. It is mainly used in food, medicine and cosmetincs, it can increase the solubility of the substances, get rid of the terrible smell and reduce the number which is taken, meanwhile, it can control the reactive speed etc.