Renee M. Happs
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View article: Storage-Induced Collapse of Lignin Macromolecular Structure and Its Impacts on the Biorefinery
Storage-Induced Collapse of Lignin Macromolecular Structure and Its Impacts on the Biorefinery Open
Lignin plays a vital role in the economics of biorefineries, serving as a source of process energy and a feedstock for sustainable fuels and chemical production. While understanding lignin's chemical composition is crucial, emerging eviden…
View article: Providing biological context for <scp>GWAS</scp> results using <scp>eQTL</scp> regulatory and co‐expression networks in <i>Populus</i>
Providing biological context for <span>GWAS</span> results using <span>eQTL</span> regulatory and co‐expression networks in <i>Populus</i> Open
Summary Our study utilized genome‐wide association studies (GWAS) to link nucleotide variants to traits in Populus trichocarpa , a species with rapid linkage disequilibrium decay. The aim was to overcome the challenge of interpreting stati…
View article: Design and Validation of a High-Throughput Reductive Catalytic Fractionation Method
Design and Validation of a High-Throughput Reductive Catalytic Fractionation Method Open
Reductive catalytic fractionation (RCF) is a promising method to extract and depolymerize lignin from biomass, and bench-scale studies have enabled considerable progress in the past decade. RCF experiments are typically conducted in pressu…
View article: Economic and Sustainability Impacts of Yield and Composition Variation in Bioenergy Crops: Switchgrass (<i>Panicum virgatum</i> L.)
Economic and Sustainability Impacts of Yield and Composition Variation in Bioenergy Crops: Switchgrass (<i>Panicum virgatum</i> L.) Open
Economically viable production of biobased products and fuels requires high-yielding, high-quality, sustainable process-advantaged crops, developed using bioengineering or advanced breeding approaches. Understanding which crop phenotypic t…
View article: Expression quantitative trait loci mapping identified <i>PtrXB38</i> as a key hub gene in adventitious root development in <i>Populus</i>
Expression quantitative trait loci mapping identified <i>PtrXB38</i> as a key hub gene in adventitious root development in <i>Populus</i> Open
Summary Plant establishment requires the formation and development of an extensive root system with architecture modulated by complex genetic networks. Here, we report the identification of the PtrXB38 gene as an expression quantitative tr…
View article: Feedstock-agnostic reductive catalytic fractionation in alcohol and alcohol–water mixtures
Feedstock-agnostic reductive catalytic fractionation in alcohol and alcohol–water mixtures Open
This work demonstrates that reductive catalytic fractionation can be a feedstock-agnostic process on hardwoods, softwoods, agricultural residues, and grasses, especially with water-alcohol solvent mixtures.
View article: Yield, chemistry, and TEA/LCA data for 84 switchgrass (Panicum virgatum L.) variants
Yield, chemistry, and TEA/LCA data for 84 switchgrass (Panicum virgatum L.) variants Open
Switchgrass yield, chemistry, technoeconomic assessment (TEA), and life cycle assessment (LCA) data referenced in the manuscript "Economics and Sustainability impacts of yield and composition variation in bioenergy crops: Panicum virgatum …
View article: Multi-pass flow-through reductive catalytic fractionation
Multi-pass flow-through reductive catalytic fractionation Open
View article: Standard Analytical Methods for Pyrolysis Bio-Oils
Standard Analytical Methods for Pyrolysis Bio-Oils Open
There has been significant recent interest in the production of renewable fuels and chemicals from biomass and waste feedstocks. Pyrolysis pathways produce a liquid bio-oil product, which must be processed further, or upgraded, to yield fu…
View article: Drivers of Thermal Instability of Catalytic Pyrolysis Oils During Hydrotreating and Co-Processing to Sustainable Fuels
Drivers of Thermal Instability of Catalytic Pyrolysis Oils During Hydrotreating and Co-Processing to Sustainable Fuels Open
This presentation goes over polymerization observed in CFPs driven by thermally labile oxygenates. Lower oxygen oils have improved stability and a few percent decrease in oxygen greatly improves stability. Further improvements could be rea…
View article: Abundance of Major Cell Wall Components in Natural Variants and Pedigrees of Populus trichocarpa
Abundance of Major Cell Wall Components in Natural Variants and Pedigrees of Populus trichocarpa Open
The rapid analysis of biopolymers including lignin and sugars in lignocellulosic biomass cell walls is essential for the analysis of the large sample populations needed for identifying heritable genetic variation in biomass feedstocks for …
View article: Lignin alkaline oxidation using reversibly-soluble bases
Lignin alkaline oxidation using reversibly-soluble bases Open
When excess base is required to drive desired reactions, such as in lignin alkaline oxidation, Sr(OH) 2 can offer a reversibly-soluble alternative to NaOH that allows simple recycle of the excess base with concomitant cost and environmenta…
View article: Recovery of low molecular weight compounds from alkaline pretreatment liquor <i>via</i> membrane separations
Recovery of low molecular weight compounds from alkaline pretreatment liquor <i>via</i> membrane separations Open
Lignin is an abundant renewable resource that is a promising substrate for upgrading to fuels and chemicals.
View article: Corresponding Standard Reference Material Data used in Partial Least Squares Regression Models for Sugar Composition Estimates in Biomass in: Economic Impact of Yield and Composition Variation in Bioenergy Crops: Populus trichocarpa
Corresponding Standard Reference Material Data used in Partial Least Squares Regression Models for Sugar Composition Estimates in Biomass in: Economic Impact of Yield and Composition Variation in Bioenergy Crops: Populus trichocarpa Open
Corresponding Standard Reference Material Data used in Partial Least Squares Regression Models for Sugar Composition Estimates in Biomass in: Economic Impact of Yield and Composition Variation in Bioenergy Crops: Populus trichocarpa (for c…
View article: Determination of Carbon Functional Groups in Pyrolysis Bio-Oils using <sup>13</sup>C NMR: Laboratory Analytical Procedure (LAP)
Determination of Carbon Functional Groups in Pyrolysis Bio-Oils using <sup>13</sup>C NMR: Laboratory Analytical Procedure (LAP) Open
Pyrolysis is a process that can be used to convert biomass to solid, liquid and gaseous products for use as renewable chemicals and fuels. The liquid fraction, known as “bio-oil” is complex and challenging to characterize, particularly by …
View article: Comparison of methodologies used to determine aromatic lignin unit ratios in lignocellulosic biomass
Comparison of methodologies used to determine aromatic lignin unit ratios in lignocellulosic biomass Open
View article: Comparison of Methodologies used to Determine Aromatic Lignin Unit Ratios in Lignocellulosic Biomass
Comparison of Methodologies used to Determine Aromatic Lignin Unit Ratios in Lignocellulosic Biomass Open
Background Multiple analytical methods have been developed to determine the ratios of aromatic lignin units, particularly the syringyl/guaiacyl (S/G) ratio, of lignin biopolymers in plant cell walls. Chemical degradation methods such as th…
View article: Additional file 1 of Comparison of methodologies used to determine aromatic lignin unit ratios in lignocellulosic biomass
Additional file 1 of Comparison of methodologies used to determine aromatic lignin unit ratios in lignocellulosic biomass Open
Additional file 1. S/G ratios determined by different methods, thioacidolysis yields, lignin content estimates, relative lignin linkage abundances and py-MBMS spectral peak TIC-normalized intensities for each sample analyzed in this study.
View article: Correction: Flow-through solvolysis enables production of native-like lignin from biomass
Correction: Flow-through solvolysis enables production of native-like lignin from biomass Open
Correction for ‘Flow-through solvolysis enables production of native-like lignin from biomass’ by David G. Brandner et al. , Green Chem. , 2021, 23 , 5437–5441, DOI: 10.1039/D1GC01591E.
View article: Additional file 3 of Comparison of methodologies used to determine aromatic lignin unit ratios in lignocellulosic biomass
Additional file 3 of Comparison of methodologies used to determine aromatic lignin unit ratios in lignocellulosic biomass Open
Additional file 3. Pearson correlation coefficients for various characteristics determined using all samples in this study.
View article: Flow-through solvolysis enables production of native-like lignin from biomass
Flow-through solvolysis enables production of native-like lignin from biomass Open
Flow-through solvolysis offers an opportunity to limit lignin condensation reactions that prevent isolation of native lignin in biomass processing, thus allowing for the study of intrinsic lignin properties and steady-state lignin depolyme…
View article: Additional file 2 of Comparison of methodologies used to determine aromatic lignin unit ratios in lignocellulosic biomass
Additional file 2 of Comparison of methodologies used to determine aromatic lignin unit ratios in lignocellulosic biomass Open
Additional file 2. Pearson correlation coefficients for various characteristics measured in the poplar samples.
View article: Electrocatalytic CO<sub>2</sub> Reduction over Cu<sub>3</sub>P Nanoparticles Generated via a Molecular Precursor Route
Electrocatalytic CO<sub>2</sub> Reduction over Cu<sub>3</sub>P Nanoparticles Generated via a Molecular Precursor Route Open
The design of nanoparticles (NPs) with tailored morphologies and finely tuned electronic and physical properties has become a key strategy for controlling selectivity and improving conversion efficiency in a variety of important electrocat…
View article: Selective One-Dimensional <sup>13</sup>C–<sup>13</sup>C Spin-Diffusion Solid-State Nuclear Magnetic Resonance Methods to Probe Spatial Arrangements in Biopolymers Including Plant Cell Walls, Peptides, and Spider Silk
Selective One-Dimensional <sup>13</sup>C–<sup>13</sup>C Spin-Diffusion Solid-State Nuclear Magnetic Resonance Methods to Probe Spatial Arrangements in Biopolymers Including Plant Cell Walls, Peptides, and Spider Silk Open
Two-dimensional (2D) and 3D through-space 13C-13C homonuclear spin-diffusion techniques are powerful solid-state nuclear magnetic resonance (NMR) tools for extracting structural information from 13C-enriche…
View article: Comparison of Methodologies Used to Determine Monolignol Ratios in Lignocellulosic Biomass
Comparison of Methodologies Used to Determine Monolignol Ratios in Lignocellulosic Biomass Open
Background Multiple analytical methods have been developed to determine the ratios of monolignol monomers, particularly the syringyl/guaiacyl (S/G) ratio, of lignin biopolymers in plant cell walls. Chemical degradation methods yield monome…
View article: Economic impact of yield and composition variation in bioenergy crops: <scp><i>Populus trichocarpa</i></scp>
Economic impact of yield and composition variation in bioenergy crops: <span><i>Populus trichocarpa</i></span> Open
To achieve a bio‐based economy, it is necessary to consider variability within a feedstock population. We must understand the range of key phenotypic characteristics when selecting economically advantageous genotypes for domestication in a…
View article: High Throughput Screening Technologies in Biomass Characterization
High Throughput Screening Technologies in Biomass Characterization Open
Biomass analysis is a slow and tedious process and not solely due to the long generation time for most plant species. Screening large numbers of plant variants for various geno-, pheno-, and chemo-types, whether naturally occurring or engi…
View article: The effect of coumaryl alcohol incorporation on the structure and composition of lignin dehydrogenation polymers
The effect of coumaryl alcohol incorporation on the structure and composition of lignin dehydrogenation polymers Open
View article: A thioacidolysis method tailored for higher‐throughput quantitative analysis of lignin monomers
A thioacidolysis method tailored for higher‐throughput quantitative analysis of lignin monomers Open
Thioacidolysis is a method used to measure the relative content of lignin monomers bound by β‐O‐4 linkages. Current thioacidolysis methods are low‐throughput as they require tedious steps for reaction product concentration prior to analysi…
View article: Quantitative <sup>13</sup>C NMR characterization of fast pyrolysis oils
Quantitative <sup>13</sup>C NMR characterization of fast pyrolysis oils Open
DEPT spectra illustrate the overlap of aromatic C–H signals in the aromatic C–C region for catalytic and hydrotreated pyrolysis oils.