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Protein extraction from agri-food residues for integration in biorefinery: Potential techniques and current status

Contreras, María del Mar, Lama-Muñoz, Antonio, Manuel Gutiérrez-Pérez, José, Espínola, Francisco, Moya, Manuel, Castro, Eulogio
Bioresource technology 2019 v.280 pp. 459-477
biobased products, biomass, biorefining, crops, environmental impact, harvesting, hydrolysates, issues and policy, proteins
The biorefinery concept is attracting scientific and policy attention as a promising option for enhancing the benefits of agri-food biomass along with a reduction of the environmental impact. Obtaining bioproducts based on proteins from agri-food residues could help to diversify the revenue stream in a biorefinery. In fact, the extracted proteins can be applied as such or in the form of hydrolyzates due to their nutritional, bioactive and techno-functional properties. In this context, the present review summarizes, exemplifies and discusses conventional extraction methods and current trends to extract proteins from residues of the harvesting, post-harvesting and/or processing of important crops worldwide. Moreover, those extraction methods just integrated in a biorefinery scheme are also described. In conclusion, a plethora of methods exits but only some of them have been applied in biorefinery designs, mostly at laboratory scale. Their economic and technical feasibility at large scale requires further study.