Abstract
Biorefining is sustainable biomass processing to obtain energy, biofuels and high value products through different technologies and processes for biomass transformation. On the other hand, microalgae have been received great interest as a biofuel feedstock in response to the uprising energy crisis, climate change and depletion of natural sources. However, the development of microalgal biofuels does not satisfy the economic feasibility to reach commercial status. Due to this, different high-value co-products have been produced through the extraction of microalgae fractions to improve the economical profile of this technology, generating in this way the microalgae biorefineries. Examples of these high-value products are pigments, proteins, lipids, carbohydrates, vitamins, and antioxidants, with applications in cosmetics, nutritional and pharmaceuticals industries. To promote the sustainability of this process, an innovative microalgae biorefinery structure is implemented through the generation of multiple products, usually in form of biofuel and other high valueproducts. This review presents the current challenges in the extraction of high value products from microalgae and its integration in the biorefinery. It describes the general characteristics of microalgae, and their potential to be used as a raw material in the biorefinery process.
 Keywords: microalgae, bioenergy, bioproducts, biorefineries.
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