Anti‐ROS and NIR‐II‐Responsive Hyaluronic Acid Microneedle Loaded With Baicalin Nanoparticles for Treatment of Psoriasis

Abstract In this work, a natural medicine, baicalin, is designed for the treatment of psoriasis with the aid of hyaluronic acid (HA)‐based MNs patches. This is also to improve the solubility of baicalin and increase its residence time in infected part, which is made into nanoparticles by complexation with humic acid and Eu 2+ . The baicalin nanoparticles loaded‐MNs exhibit satisfactory rigidity, minimum injury, and controlled drug delivery. The anti‐reactive oxygen species (anti‐ROS) and anti‐inflammatory action are verified by the effective scavenging oxygen and nitrogen radicals. In addition, the loading of baicalin nanoparticles brings remarkable photothermic effect to the MNs, enabling the device to release a controlled drug under near‐infrared region II (NIR‐II) laser irradiation. With the aid of NIR‐II laser, the baicalin‐mediated treatment of psoriasis is significantly improved by expediting radical scavenging and suppressing inflammation. The design of baicalin MNs provides a new idea for the treatment of chronic disease.