Recycling Potential of Brewer’s Spent Grains for Circular Biorefineries

Deepti Agrawal, Deeksha Gopaliya, Nicholas Willoughby, Sunil K. Khare, Vinod Kumar

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
70 Downloads (Pure)


Brewer’s Spent Grain (BSG) is the major by-product of the brewing industry. BSG is principally composed of carbohydrates and proteins, with substantial amount of lipids. Presently, BSG usage is restricted to low-grade applications such as ruminant feed or landfills. The high volume, nutrient-rich composition, low cost (€35/ton), abundance, and around the year availability, makes it a promising and renewable feedstock for biorefinery development. The current review begins with beer production process, where BSG is produced. Further, it appraises emerging biotechnological advancements and green processes targeting BSG valorisation ensuring maximal resource recovery. Particularly, it illustrates diverse marketable products obtained by repurposing carbohydrate and protein fraction of BSG using either isolated or cascading approach. We believe that this review will encourage more research groups to work on developing innovative technologies for integrated and holistic valorisation of BSG. Inclusive efforts towards reduced water consumption and waste minimisation is further advocated, which are presently primary challenges associated with beer industry. It will leave a significant imprint on environmental sustainability and pave a way for developing circular bio-based economy.
Original languageEnglish
Article number100748
JournalCurrent Opinion in Green and Sustainable Chemistry
Early online date23 Dec 2022
Publication statusPublished - Apr 2023


  • Brewer's spent grain
  • Carbohydrates
  • Circular economy
  • Protein
  • Valorisation

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Waste Management and Disposal
  • Process Chemistry and Technology
  • Management, Monitoring, Policy and Law
  • Catalysis


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