Plant bling: cellulose that sparkles – Nature Biotechnology

Plant-based glitter with sustainable credentials has arrived. Cambridge, UK–based startup Sparxell has developed a color platform that could replace the inorganic and synthetic shiny particles in powders, liquids, films and foils that end up scattered in the environment, polluting soil, air and water. These biodegradable pigments are based on cellulose, a polysaccharide. As the main component in the cell walls of plants, it the most abundant organic polymer on Earth.

Sparxell has made cellulose nanocrystals and could replace the shine in synthetic dyes, microplastics and unsustainable mined glitters such as titania or mica with natural, biodegradable components. Its cellulose nanocrystals reflect light to produce vibrant colors, just as in butterfly wings and peacock tails but using wood pulp or other plant waste instead. The colors are durable and fade resistant, and they can replace plastic glitter used in packaging, cosmetics and personal care with a natural and biodegradable alternative.

The company’s patent-protected technology involves a cellulose nanocrystal suspension that is dried as a large, iridescent film. One of the main challenges is scaling up for industrial use. The company is developing prototypes and samples and is currently working on proof of concept across key target industries such as cosmetics and fashion, while also scaling up its manufacturing facilities to increase production. Sparxell recently raised a seed funding round of over $3.2 million.