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Title: Production of xylose enriched hydrolysate from bioenergy sorghum and its conversion to β-carotene using an engineered Saccharomyces cerevisiae

Abstract

A new bioprocess has been created that allows for producing β-carotene from the xylose portion of bioenergy sorghum. Bioenergy sorghum was pretreated in a pilot-scale continuous hydrothermal reactor followed by disc refining. Xylose was extracted using low-severity dilute acid hydrolysis. A xylose yield of 64.9% (17.4 g/L) was obtained by hydrolyzing at 120 °C for 5 min with 2% sulfuric acid. The xylose-enriched syrup was separated and concentrated to either 32 g xylose/L (medium-concentrated hydrolysate, MCB) or 66 g xylose/L (high-concentrated hydrolysate, HCB). The non- (NCB), medium-, and high-concentrated xylose syrup were neutralized and fermented to β-carotene using Saccharomyces cerevisiae strain SR8B, which had been engineered for xylose utilization and β-carotene production. In HCB, MCB, and NCB cultures, the yeast produced β-carotene titers of 114.50 mg/L, 93.56 mg/L, and 82.50 mg/L, which corresponds to specific yeast biomass productions of 7.32 mg/g DCW, 8.10 mg/g DCW, and 8.29 mg/g DCW, respectively.

Authors:
 [1];  [1];  [1];  [2];  [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States)
  2. US Dept. of Agriculture-Agriculture Research Service (USDA-ARS), Peoria, IL (United States)
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1616272
Alternate Identifier(s):
OSTI ID: 1608385
Grant/Contract Number:  
SC0018420
Resource Type:
Accepted Manuscript
Journal Name:
Bioresource Technology
Additional Journal Information:
Journal Volume: 308; Journal Issue: C; Journal ID: ISSN 0960-8524
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; Xylose; β-Carotene; Hydrothermally pretreated; Bioenergy sorghum; Saccharomyces cerevisiae; Dilute acid hydrolysis

Citation Formats

Cheng, Ming-Hsun, Sun, Liang, Jin, Yong-Su, Dien, Bruce, and Singh, Vijay. Production of xylose enriched hydrolysate from bioenergy sorghum and its conversion to β-carotene using an engineered Saccharomyces cerevisiae. United States: N. p., 2020. Web. doi:10.1016/j.biortech.2020.123275.
Cheng, Ming-Hsun, Sun, Liang, Jin, Yong-Su, Dien, Bruce, & Singh, Vijay. Production of xylose enriched hydrolysate from bioenergy sorghum and its conversion to β-carotene using an engineered Saccharomyces cerevisiae. United States. https://doi.org/10.1016/j.biortech.2020.123275
Cheng, Ming-Hsun, Sun, Liang, Jin, Yong-Su, Dien, Bruce, and Singh, Vijay. Wed . "Production of xylose enriched hydrolysate from bioenergy sorghum and its conversion to β-carotene using an engineered Saccharomyces cerevisiae". United States. https://doi.org/10.1016/j.biortech.2020.123275. https://www.osti.gov/servlets/purl/1616272.
@article{osti_1616272,
title = {Production of xylose enriched hydrolysate from bioenergy sorghum and its conversion to β-carotene using an engineered Saccharomyces cerevisiae},
author = {Cheng, Ming-Hsun and Sun, Liang and Jin, Yong-Su and Dien, Bruce and Singh, Vijay},
abstractNote = {A new bioprocess has been created that allows for producing β-carotene from the xylose portion of bioenergy sorghum. Bioenergy sorghum was pretreated in a pilot-scale continuous hydrothermal reactor followed by disc refining. Xylose was extracted using low-severity dilute acid hydrolysis. A xylose yield of 64.9% (17.4 g/L) was obtained by hydrolyzing at 120 °C for 5 min with 2% sulfuric acid. The xylose-enriched syrup was separated and concentrated to either 32 g xylose/L (medium-concentrated hydrolysate, MCB) or 66 g xylose/L (high-concentrated hydrolysate, HCB). The non- (NCB), medium-, and high-concentrated xylose syrup were neutralized and fermented to β-carotene using Saccharomyces cerevisiae strain SR8B, which had been engineered for xylose utilization and β-carotene production. In HCB, MCB, and NCB cultures, the yeast produced β-carotene titers of 114.50 mg/L, 93.56 mg/L, and 82.50 mg/L, which corresponds to specific yeast biomass productions of 7.32 mg/g DCW, 8.10 mg/g DCW, and 8.29 mg/g DCW, respectively.},
doi = {10.1016/j.biortech.2020.123275},
journal = {Bioresource Technology},
number = C,
volume = 308,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 2020},
month = {Wed Jul 01 00:00:00 EDT 2020}
}

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Cited by: 16 works
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