Title: A technique for lyopreservation of Clostridium ljungdahlii in a biocomposite matrix for CO absorption

Abstract

A system capable of biocatalytic conversion of distributed sources of single carbon gases such as carbon monoxide into hydrocarbons can be highly beneficial for developing commercially viable biotechnology applications in alternative energy. Several anaerobic bacterial strains can be used for such conversion. The anaerobic carbon monoxide-fixing bacteria Clostridium ljungdahlii OTA1 is a model CO assimilating microorganism that currently requires cryogenic temperature for storage of the viable strains. If these organisms can be stabilized and concentrated in thin films in advanced porous materials, it will enable development of high gas fraction, biocomposite absorbers with elevated carbon monoxide (CO) mass transfer rate, that require minimal power input and liquid, and demonstrate elevated substrate consumption rate compared to conventional suspended cell bioreactors. We report development of a technique for dry-stabilization of C. ljungdahlii OTA1 on a paper biocomposite. Bacterial samples coated onto paper were desiccated in the presence of trehalose using convective drying and stored at 4°C. Optimal dryness was ~1g H₂O per gram of dry weight (g_DW). CO uptake directly following biocomposite rehydration steadily increases over time indicating immediate cellular metabolic recovery. A high-resolution Raman microspectroscopic hyperspectral imaging technique was employed to spatially quantify the residual moisture content. We have demonstrated formore » the first time that convectively dried and stored C. ljungdahlii strains were stabilized in a desiccated state for over 38 days without a loss in CO absorbing reactivity. The Raman hyperspectral imaging technique described here is a non-invasive characterization tool to support development of dry-stabilization techniques for microorganisms on inexpensive porous support materials. In conclusion, the present study successfully extends and implements the principles of dry-stabilization for preservation of strictly anaerobic bacteria as an alternative to lyophilization or spray drying that could enable centralized biocomposite biocatalyst fabrication and decentralized bioprocessing of CO to liquid fuels or chemicals.« less

Authors:

Schulte, Mark J.; Solocinski, Jason; Wang, Mian; Kovacs, Michelle; Kilgore, Ryan; Osgood, Quinn; Underwood, Lukas; Flickinger, Michael C.; Chakraborty, Nilay ;

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• Search DOE PAGES for ORCID "0000-0001-8138-3506"

He, ed., Xiaoming

Publication Date:

Wed Jul 05 00:00:00 EDT 2017

Research Org.:

North Carolina State University, Raleigh, NC (United States); University of Michigan-Dearborn, MI (United States)

Sponsoring Org.:

USDOE Office of Energy Efficiency and Renewable Energy (EERE)

OSTI Identifier:

1367938

Alternate Identifier(s):

OSTI ID: 1393201

Grant/Contract Number:  

EE0006877; SusChEM 1510072; CHE 1609440; T32 GM008776-11; U038726; U046888

Resource Type:

Published Article

Journal Name:

PLoS ONE

Additional Journal Information:

Journal Name: PLoS ONE Journal Volume: 12 Journal Issue: 7; Journal ID: ISSN 1932-6203

Publisher:

Public Library of Science (PLoS)

Country of Publication:

United States

Language:

English

Subject:

59 BASIC BIOLOGICAL SCIENCES; anaerobic bacteria; trehalose; coatings; specimen storage; biocatalysis; gases; argon; clostridium