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Sugar yield and composition of tubers from Jerusalem Artichoke ( Helianthus tuberosus ) irrigated with saline waters

Journal Article · · Biotechnology and Bioengineering
DOI:https://doi.org/10.1002/bit.26582· OSTI ID:1426355
 [1];  [2];  [1];  [3];  [2];  [2];  [2];  [4];  [1]
  1. Department of Chemical and Environmental Engineering Bourns College of Engineering University of California Riverside Riverside California, Center for Environmental Research and Technology (CE‐CERT), Bourns College of Engineering University of California Riverside Riverside California, Oak Ridge National Laboratory BioEnergy Science Center (BESC) Oak Ridge Tennessee
  2. US Salinity Laboratory Riverside California
  3. Department of Chemical and Environmental Engineering Bourns College of Engineering University of California Riverside Riverside California, Center for Environmental Research and Technology (CE‐CERT), Bourns College of Engineering University of California Riverside Riverside California
  4. Center for Environmental Research and Technology (CE‐CERT), Bourns College of Engineering University of California Riverside Riverside California, Oak Ridge National Laboratory BioEnergy Science Center (BESC) Oak Ridge Tennessee

Abstract

Currently, major biofuel crops are also food crops that demand fertile soils and good‐quality water. Jerusalem artichoke ( Helianthus tuberosus , Asteraceae) produces high tonnage of tubers that are rich in sugars, mainly in the form of inulin. In this study, plants of the cultivar “White Fuseau” grown under five salinity levels were evaluated for tuber yield. Results indicated that this cultivar is moderately salt‐tolerant if the goal is tuber production. Hydraulic pressings of the tubers produced juice that contained 15% (wet weight) or 55% (dry weight) free sugars, with 70% of these in the form of inulin and the rest as fructose, sucrose, and glucose. Importantly, salinity did not affect the total free sugar or inulin content of the tubers. Tubers were composed of about 12% dry washed bagasse (wet weight) or 44% (dry matter basis) and bagasse retained such high quantities of free sugars after pressing that washing was required for complete sugar recovery. Chemical composition analysis of tuber bagasse suggested that it had low lignin content (11–13 wt%), and its structural sugar composition was similar to chicory root bagasse. Because of the high hemicellulose and pectin content of the bagasse, adding xylanase and pectinase to cellulase substantially improved sugar yields from enzymatic hydrolysis compared to at the same protein loading as cellulase alone. In addition to the high total sugar yield of tuber, these first findings on the sugar and lignin content and enzymatic hydrolysis of tuber bagasse can lead to low‐cost production of ethanol for transportation fuels.

Sponsoring Organization:
USDOE
OSTI ID:
1426355
Journal Information:
Biotechnology and Bioengineering, Journal Name: Biotechnology and Bioengineering Journal Issue: 6 Vol. 115; ISSN 0006-3592
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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