The microalgae extracts were func onalized with acrylate groups adap ng a previously reported solvent-free one-step approach (further details can be found in the Suppor ng Informa on). The reac on was carried out for 24 h at a temperature of 75 °C and the double bond conversion was monitored by 1 H-NMR spectroscopy (Figure and Figure ). Please note that a er func onalizing the microalgae-based extracts with acrylates they are referred to as "inks". Despite having a lower unsatura on degree (3.3), the O. aurita-based inks show high conversion of double bonds (68 %), leading to 2.3 acrylate groups per molecule on average. T. striata-based inks exhibit a higher number of acrylate groups per molecule, with approximately 2.8 and a conversion of 60 %. The obtained values indicate that not only the quan ty, but also the loca on of the unsatura ons within the triglyceride molecule affects the conversion of double bonds.