Journal
BIOTECHNOLOGY ADVANCES
Volume 42, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biotechadv.2020.107579
Keywords
Raw starch; Amylases; Bioethanol; Recombinant yeast; Consolidated bioprocessing; Starch hydrolysis; Starch fermentation; Saccharomyces cerevisiae
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Funding
- South African The National Research Foundation (NRF) [86423]
- bilateral joint research project between Italy and South Africa [DOR1931153, DOR2087054]
- Padova University [DOR1931153, DOR2087054]
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Recent advances in amylolytic strain engineering for starch-to-ethanol conversion have provided a platform for the development of raw starch consolidated bioprocessing (CBP) technologies. Several proof-of-concept studies identified improved enzyme combinations, alternative feedstocks and novel host strains for evaluation and application under fermentation conditions. However, further research efforts are required before this technology can be scaled up to an industrial level. In this review, different CBP approaches are defined and discussed, also highlighting the role of auxiliary enzymes for a supplemented CBP process. Various achievements in the development of amylolytic Saccharomyces cerevisiae strains for CBP of raw starch and the remaining challenges that need to be tackled/pursued to bring yeast raw starch CBP to industrial realization, are described. Looking towards the future, it provides potential solutions to develop more cost-effective processes that include cheaper substrates, integration of the 1G and 2G economies and implementing a biorefinery concept where high-value products are also derived from starchy substrates.
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