Reactions conducted with 2% TPP were found to be easier to handle and to scale up. At the end of the reaction, the obtained methacrylated epoxidated microalgal oil (MEMO) was purified from the methacrylic acid residue to remove possible reactive double bonds that can interfere during the successive curing step (Suppl. Info.). For the purification step, the oil was diluted with EtOAc and washed with a water solution of NaHCO₃ (2.5% w/v). After all the washing steps, the organic phase was dried over sodium sulfate, and the solvent evaporated under reduced pressure. The purification of the MEMO to remove the residues of methacrylic acid was also confirmed by diffusion ordered spectroscopy (DOSY). The purified MEMO, a dark orange oil, was stored at 4 °C until used, and a sample was taken to analyze the product with 1H NMR (Figure ). Comparing the methacrylation product spectrum to that of the epoxidation mixture, the peaks of the epoxide groups (3.00 ppm) decrease and new ones corresponding to the methacrylic acid (5.5-6.5 ppm) appear. Peaks from the residual methacrylic acid were at 5.66 and 6.2 ppm.