We compare two different techniques for the extraction of biodiesel from macroalgae: the thermochemical liquefaction and the extraction using supercritical carbon dioxide (sc-CO 2 ). The first allows to use wet material, while sc-CO 2 requires dry material and uses moderate temperature and pressure so that it can be useful for the extraction of thermolabile compounds which may decompose at the temperature at which thermal methos are carried out. In both cases the extracted oil was characterized quantitatively and qualitatively. The novelty of the work is that in the literature the use of macroalgae for the production of biodiesel has not so far been described, while they are used mainly as food or other purposes.

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Rocking chair enzyme: Chemical reducing agents (sodium dithionite) or bioglycerol (as H and e−‐donor under irradiation in the presence of ZnS‐A as photocatalyst) are able to back‐convert NADP+ into NADPH, which is used as e−‐donor in the enzymatic reduction of CO2 into CH3OH. In doing so, the molar ratio CH3OH/CO2 has been increased (without recycling of NADP+) using the photocatalyst.

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