PROBLEM TO BE SOLVED: To provide ultrafine nanogel particles of polycyclodextrin having a smaller particle size, a lower polydispersity index (PDI), and a higher affinity for water. Ultrafine nanogel particles of polycyclodextrin having an average particle size of 10 nm or less and a particle size polydispersion index (PDI) of 0.75 or less. [Selection diagram] None
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