Accumulation of high-value bioproducts in planta can improve the economics of advanced biofuels

Accumulation of high-value bioproducts in planta can improve the economics of advanced biofuels

TitleAccumulation of high-value bioproducts in planta can improve the economics of advanced biofuels
Publication TypeJournal Article
Year of Publication2020
AuthorsMinliang Yang, Nawa Baral, Blake A Simmons, Jenny C Mortimer, Patrick M Shih, Corinne Scown
JournalProceedings of the National Academy of Sciences
Volume117
Issue15
Pagination8639 - 8648
Date Published04/2020
ISSN0027-8424
Abstract

Coproduction of high-value bioproducts at biorefineries is a key factor in making biofuels more cost-competitive. One strategy for generating coproducts is to directly engineer bioenergy crops to accumulate bioproducts in planta that can be fractionated and recovered at biorefineries. Here, we develop quantitative insights into the relationship between bioproduct market value and target accumulation rates by investigating a set of industrially relevant compounds already extracted from plant sources with a wide range of market prices and applications, including <$10/kg (limonene, latex, and polyhydroxybutyrate [PHB]), $10 to $100/kg (cannabidiol), and >$100/kg (artemisinin). These compounds are used to identify a range of mass fraction thresholds required to achieve net economic benefits for biorefineries and the additional amounts needed to reach a target $2.50/gal biofuel selling price, using cellulosic ethanol production as a test case. Bioproduct market prices and recovery costs determine the accumulation threshold; we find that moderate- to high-value compounds (i.e., cannabidiol and artemisinin) offer net economic benefits at accumulation rates of just 0.01% dry weight (dwt) to 0.02 dwt%. Lower-value compounds, including limonene, latex, and PHB, require at least an order-of-magnitude greater accumulation to overcome additional extraction and recovery costs (0.3 to 1.2 dwt%). We also find that a diversified approach is critical. For example, global artemisinin demand could be met with fewer than 10 biorefineries, while global demand for latex is equivalent to nearly 180 facilities. Our results provide a roadmap for future plant metabolic engineering efforts aimed at increasing the value derived from bioenergy crops.

URLhttp://www.pnas.org/lookup/doi/10.1073/pnas.2000053117https://syndication.highwire.org/content/doi/10.1073/pnas.2000053117http://www.pnas.org/syndication/doi/10.1073/pnas.2000053117
DOI10.1073/pnas.2000053117
Short TitleProc Natl Acad Sci USA