Algal residue—an alternative carbon resource for pharmaceuticals and polyesters

Microalgae have received much attention in biomass production due to many strains having a high biomass productivity per unit time and per unit area. Algae produce high levels of oil as well as carbohydrates, occurring mainly in the form of starch. They can survive in unfavorable, nutrient deficient conditions, and can be propagated industrially without using farmland. Oil derived from algae has recently been adopted for use in jet fuels and biodiesel. Previously overlooked, however, was the starch remaining in algal cells after oil extraction. Tokyo Tech researcher Sho Yamaguchi and colleagues found that this starch can be converted into alkyl lactate and alkyl levulinate, important chemicals in the production of pharmaceuticals, additives, and polyesters.