Quantification of β-CDs Showing Guest Inclusion Ability. MO is a dye known to form an inclusion complex with β-CD. The functionable β-CDs supported on PP NWF were quantified via the following method. The non-treated and β-CD-supported PP NWFs (10-15 mg; 2 × 2 cm 2 ) were immersed in 4 mL of 0.25 mg/mL MO aqueous solution (20 min, room temperature) and rinsed with distilled water. The adsorbed MO was then desorbed in 4 mL of 70% ethanol (1 h, room temperature). The MO concentration in the supernatant was calculated from the absorption at 428 nm using a UV-visible spectrophotometer V-750 (Jasco, Japan). The results were calculated as the average of three repetitions. Drug Loading and Release. Diclofenac sodium is a drug known to form an inclusion complex with β-CD. β-CDsupported PP NWFs (30-35 mg; 3.0 × 3.0 cm 2 ) were placed in 6 mL of a 0.5 mg/mL diclofenac sodium aqueous solution (48 h, room temperature) in the dark. The amount of diclofenac sodium loaded onto the PP NWFs was calculated from the absorbance of the surrounding solution at 276 nm using a UV-visible spectrophotometer V-750 (Jasco, Japan). The samples were washed with distilled water and dried in vacuo. Drug-loaded samples (30-35 mg; 3.0 × 3.0 cm 2 ) were transferred to a vial containing 6 mL of 10 mM phosphate buffer (pH 7.4). Experiments were conducted without stirring. The samples were withdrawn at regular intervals (10 and 30 min; and 1, 3, 6, 9, 12, 24, and 48 h) and returned to the vial immediately after the absorbance measurements at 276 nm. This procedure was performed for 48 h. The reusability as a drug carrier was also evaluated. After first drug release for 48 h, samples were washed with distilled water and dried in vacuo. Then the drug was reloaded and the second experiment was carried out as described above. All results were calculated as the average of three repetitions.