Transforming Discarded Banana Peels into Functional Food and Drink via Fermentation: Space Seed Holdings Files Patent for Banana Peel Upcycling Technology

Space Seed Holdings Inc. (Headquarters: Minato-ku, Tokyo; CEO: Kengo Suzuki) has filed a patent for a "method for producing fermented banana peel compositions," which upcycles banana peels—previously discarded in large quantities—into raw materials for beverages, powders, and fermented foods using fermentation technology. This application is a joint filing with the Butterfly Pea Research Institute (Headquarters: Naha, Okinawa; CEO: Wang Penglong). The core of this invention lies in an unexpected discovery. While black koji mold, known for producing high levels of citric acid, typically creates a sour "amazake" when fermenting grains, it suppresses acidity and brings out sweetness and rich flavors when used on banana peels. This effect, difficult to predict from conventional wisdom, became the starting point for this technology. Globally, over 3.5 million tons of banana peels are discarded annually during food processing. While peels are rich in polyphenols, dietary fiber, potassium, magnesium, and B vitamins, their strong bitterness and tough fibers have historically made them difficult to use for consumption. This invention solves these issues by not drying the peels, breaking them down with enzymes (cellulase/pectinase), and fermenting them with black koji mold. This transforms waste into ingredients with sweet, fruity flavors. The initial research focused on apple bananas grown in Okinawa, with the cooperation of Ryukyu Plantations. Space Seed Holdings, a space-focused deep-tech venture builder, views this technology as a crucial piece for human life beyond Earth, as it creates a closed-loop food supply system. Moving forward, the company plans to implement this in Okinawa, develop commercial products, and pursue international patent rights to establish a model where technology and local economies thrive together.