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Published: 2022-08-03

New way to produce bio-based products from quinoa residue

NEWS Bio4Energy researchers at Umeå University have found a new building block for biorefinery. It could be decisive for using quinoa residues grown in extreme environments in South America in the future. The results are published in the scientific journal Fermentation.

Text: Anna Strom

We can think about applications such as fine chemicals, medical materials and food additives.

A long-running research project designed to create the conditions for making renewable fuels, chemicals and pesticides from residues of the agricultural crop quinoa; grown in extreme environments; has hit a major milestone.

Bio4Energy’s long-running ‘Quinoa Project’, started in 2017 by scientists in Sweden and Bolivia, not only has expanded to a multi-partner effort, but also has classified and provided a detailed map of characteristics of a previously unknown bacterium that can be at the base of high value-added biorefinery products.

This bacterium lives on the Andean Altiplano, or high-altitude plateau, of the great mountain range straddling Bolivia and a number of other South American countries. To protect itself from the intense sunlight and high salt concentration of its environment, it produces a type of polymer (a base component of many living organisms), which the scientists believe can be at the base of a number of high value-added biorefinery applications. It is this "exopolysaccharide" polymer that can become use products down the line.

"We believe that this type of polymer will be useful for producing products of high market value. We can think about applications such as fine chemicals, medical materials and food additives", says Carlos Martín Medina, visiting professor at the Department of Chemistry at Umeå University in Sweden. He shares the project leadership with Cristhian Carrasco of the Bolivian Universidad Mayor de San Andrés.

This means that scientists across the world who have the competence and access to infrastructure, with the classification of this bacterium, Bacillus atrophaeus, have the possibility to use the new research results for making bio-based applications from crops grown in extreme environments.

In Bolivia and other South American countries, a good part of the population are farmers who rely on the production of the protein-rich staple crop quinoa for their subsistence.

On the one hand, demand for this health food from the rest of the world has dwindled as importers such as the U.S.A. have turned to growing the crop domestically. On the other, important negative environmental consequences have sprung from the quinoa production, including depleted and contaminated soils, due to monoculture and use of petroleum-based fertilizers, as well as a problematic amount of agricultural waste.

Several of the governments of South America see great promise in biorefinery. This means the production of fuels, chemicals and materials; using renewable starting materials such as organic waste, instead of fossil resources such as oil or gas.

However, methods and tools for converting agricultural residue, such as quinoa stalks, must be delevoped. Given the harsh environment of the high Altiplano — a salt flat situated at an altitude of 3000-4500 metre above sea level — the size of the task is great.

Next step

In a next step, researchers at Umeå University will investigate which industries may benefit most from the present discovery. In other words, potential applications will be identified.

The current project is a collaboration between scientists at Umeå University, Bolivian Universidad Mayor de San Andrés of Bolivia and consultant researchers at the RISE Research Institutes of Sweden.

The Quinoa Project is supported by the Swedish International Development Agency and Bio4Energy. The Swedish Research Council provided financial support during the 2017-2021 period.

About the scientific article:

Chambi, D.; Lundqvist, J.; Nygren, E.; Romero-Soto, L.; Marin, K.; Gorzsás, A.; Hedenström, M.; Carlborg, M.; Broström, M.; Sundman, O.; Carrasco, C.; Jönsson, L.J.; Martín, C. Production of Exopolysaccharides by Cultivation of Halotolerant Bacillus atrophaeus BU4 in Glucose- and Xylose-Based Synthetic Media and in Hydrolysates of Quinoa Stalks. Fermentation 2022, 8, 79.


For more information, please contact:

Carlos Martín
Visiting professor