Figure 15.

a) Shell structure of Kaol demonstrated the possibility of the manipulation of controlled curcumin release from intestine. Reproduced with permission.^{[ 90 ]} Copyright 2019, Elsevier. b) Kaol was used to deliver gastrointestinal drugs to the intestine to avoid premature release in the stomach. Reproduced with permission.^{[ 161 ]} Copyright 2020, Elsevier. c) KNTs have led to attempts at the encapsulation of 5‐FU for sustained release. Reproduced with permission.^{[ 86 ]} Copyright 2019, Elsevier).