A team of University of Canterbury students is working on a way to turn one of the brewing industry’s biggest waste problems into a material that sells for a small fortune around the world.
The project, called Nanobrew, aims to convert spent grain, the soggy leftover barley that piles up after beer is brewed, into a natural fibre called nanocellulose. Nanocellulose is already used in biodegradable plastics, cosmetics, packaging and even the circuit boards inside electronics, and the global market for it runs into the billions of dollars.
Spent grain makes up about 85 percent of all brewing waste, and it is a persistent headache for breweries because it spoils so fast. Jade Wilson, a third-year biochemistry student on the team, said the timing pressure is one of the main problems brewers face. As she told the University of Canterbury, “Brewers have to organise farmers to come and pick up the waste on the same day that they do the brewing, and if it’s not that same day, then it’s gone off and it can’t be fed to animals.”
Much of that grain ends up in landfill, where it rots and gives off greenhouse gases. The students estimate their approach could keep about 13,700 tonnes of waste out of landfill each year, cutting emissions equal to taking around 3,300 petrol cars off the road. That figure is what drew the group to the idea in the first place, because it tackles a waste stream that most people never see but that every brewery has to deal with.
The science behind Nanobrew relies on two specialised enzymes. The enzymes break down the tough plant structures that wrap around the cellulose fibres in barley grain, and the fibres are then processed down to nano-scale particles. One of the enzymes the team is using is a reconstructed ancestral endoglucanase, a version of a natural enzyme rebuilt from evolutionary history so that it holds up better under heat.
Dr Amy Yewdall, a University of Canterbury researcher and Principal Investigator at the Biomolecular Interaction Centre, is one of the mentors guiding the work. She explained why the reconstructed enzyme matters. “These conserved regions imbue more thermostable properties to the enzyme, meaning it stays active at high temperatures,” she said. Staying active under heat is useful in an industrial setting, where a process that falls apart at warm temperatures is far harder to run at scale.
Wilson said nanocellulose is drawing attention across a lot of different fields at the moment. “It’s one of those new, really exciting materials, so it’s being explored in a range of applications,” she said. The material is prized because it is strong, flexible and comes from a renewable source, which makes it a candidate to replace some petroleum-based plastics.
The project is the team’s entry in the international Genetically Engineered Machine competition, known as iGEM, a global contest that challenges student groups to use synthetic biology to solve real-world problems. The design the Canterbury students have drawn up centres on a bioreactor in which bacteria are engineered to produce the enzymes needed to break the grain down.
For Wilson, part of the appeal is the chance to run a genuine research project from the ground up rather than following a set experiment. “It’s not often that undergraduates get to do a full research project that’s their idea from the very start,” she said.
The ten-strong team includes Wilson alongside Samuel Ramsay, Rosie McCormick, Bella Marsh, Thea-Rose Willcocks, Aislinn Prest, Charles Cadillac, JP Opperman, Kaito Ito and Grace Baragwanath. They are being supported by university staff including Dr Ali Nazmi and Dr Hossein Zadeh from the School of Product Design, along with industry partner Leo Vanhanen.
The students are aiming to have preliminary results within a few months and to finish the research by October. The big goal is the iGEM jamboree in Paris in November 2026, a gathering that brings together more than 2,000 participants from student teams around the world. The Canterbury group is fundraising to cover the cost of getting there and presenting what they have found.
If the idea works, the payoff could reach well beyond the lab. New Zealand has a large and growing craft brewing sector, and a reliable way to turn spent grain into a high-value product would give breweries a reason to hang on to a by-product they currently pay to get rid of. The team has said it plans to return in December to share its findings with the wider community and with the brewery partners who have an interest in seeing the work succeed, as reported by RNZ.
For now the work is still at an early stage, and turning a promising design into a proven industrial process is a long road. But the students have set themselves a clear target, and they are chasing a problem that sits at the meeting point of two things New Zealanders care about, good beer and less waste.
What do you make of the Nanobrew idea and the push to find new uses for brewery waste? Share your thoughts in the comments below.
This article was written by AI, briefed to report the facts, hopefully without some of the bias people bring to the job π
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