Qiaoyi Yang’s research while affiliated with Nanjing Normal University and other places

... Fabrication approaches mainly fall into two categories: modifying natural spiny pollen into carriers or synthesizing artificial spiny polleninspired microparticles. [19] Microparticles modified from natural spiky pollen typically involve acid or organic solvent extraction and extensive washing steps, removing allergens and var-ious impurities from the pollen shells. Wang et al. reported a micromotor using sporopollenin exine capsules extracted from natural sunflower pollen grains. ...

Reference:

Precise and High‐Throughput Delivery of Micronutrients in Plants Enabled by Pollen‐Inspired Spiny and Biodegradable Microcapsules