Protocol for photo-controlling the assembly of cyclic peptide nanotubes in solution and inside microfluidic droplets

In this protocol, we describe how to perform the photo-isomerization of cyclic peptides containing an unsaturated β-amino acid. This process triggers the formation or disassembly of cyclic peptide nanotubes under appropriate light irradiation. Specifically, we start by describing the solid-phase synthesis of the cyclic peptide component. We also present a technique for performing isomerization studies in solution and how to extend it to microfluidic aqueous droplets. For complete details on the use and execution of this protocol, please refer to Vilela-Picos et al.¹.