Summary
Corn is a high starchy cereal crop with the highest production and provides over 85% of the starch produced worldwide. Various by-products, differentiated by technological process features such as steep liquor, corn germ, corn bran, gluten, are created largely during corn starch processing. They are inexpensive, nutrient-rich, and vary widely in chemical composition such as proteins, oils, carbohydrates, and minerals. In an increasingly resource-constrained modern world, the utilization approach of these by-products for non-starch industrial processing is attractive widely considering both nutritive value and economic aspects. In fact, at present, applications of these by-products can often be found in feed, fermentation, nutrient extraction and other industries. For example, protein-rich
Regional applicability
Corn starch processing is a global commodity industry, though the scale and downstream utilisation pathways vary by region. The by-product separation technologies and compositional data reported are internationally applicable; however, UK corn production is limited, and most starch processing occurs elsewhere. The findings on value-added product development (pharmaceuticals, functional foods) are relevant to UK food and health sectors as import-dependent consumers and potential processors.
Key measures
Chemical composition profiles (proteins, oils, carbohydrates, minerals) of by-product streams; industrial application categories and market development over the preceding decade
Outcomes reported
The review synthesises knowledge on separation processes, chemical composition, and industrial applications of corn starch processing by-products including steep liquor, corn germ, corn bran, and gluten. It identifies applications across feed, fermentation, nutrient extraction, pharmaceuticals, and functional food sectors, and highlights opportunities for high value-added product development.
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