Spent Grain: A Functional Ingredient for Food Applications

Area of Science:

• Food Science
• Biotechnology
• Sustainable Agriculture

Background:

• Spent grain is a nutritionally dense by-product of wort removal, rich in fiber, protein, lipids, vitamins, and minerals.
• Its high moisture and protein content necessitate proper management to prevent microbial contamination and facilitate valorization.
• Effective processing of spent grain aligns with circular economy principles, promoting waste reduction and resource reuse in the food industry.

Purpose of the Study:

• To review and update information on the incorporation of spent grain into diverse food products.
• To analyze the impact of spent grain addition on the characteristics and quality of these foods.
• To highlight the role of spent grain valorization in advancing the circular bio-economy and sustainable development.

Main Methods:

• Literature review of scientific publications and industry reports on spent grain utilization.
• Analysis of studies detailing the nutritional composition and functional properties of spent grain.
• Examination of research on the sensory, textural, and shelf-life implications of adding spent grain to food matrices.

Main Results:

• Spent grain can be successfully incorporated into bakery products, pasta, snacks, and dairy/plant-based alternatives.
• Nutritional fortification with spent grain enhances fiber, protein, and mineral content in fortified foods.
• The addition of spent grain can influence product texture, taste, and overall quality, requiring optimized processing.

Conclusions:

• Valorizing spent grain as a food ingredient offers a sustainable solution for waste management in the brewing industry.
• Incorporating spent grain into food products aligns with circular bio-economy and industrial symbiosis, promoting sustainable development.
• Further research is needed to optimize processing techniques and fully leverage the potential of spent grain in the food sector.