Sally A. Ralph

NMR of Fully and Partially $^{13}$C-Enriched Biomass Enhances Pendent Group Structural Characterization

John Ralph, Guy Lippens, Marco Tonelli, Charles G. Fry (1747018) et autres

Traditional solution-state NMR experiments may either fail or yield unsatisfactory results when employing fully-$^{13}$C-labeled biomass due to complications arising from $^{13}$C–$^{13}$C coupling. Constant-time analogs of HSQC experiments mitigate such issues and deliver enhanced sensitivity. A rarely reported CT-HSQC-TOCSY experiment allows the proton …

NMR of Fully and Partially 13 C-Enriched Biomass Enhances Pendent Group Structural Characterization

John Ralph, Guy Lippens, Marco Tonelli, Charles G. Fry et autres

High Resolution Image Download MS PowerPoint Slide Traditional solution-state NMR experiments may either fail or yield unsatisfactory results when employing fully- 13 C-labeled biomass due to complications arising from 13 C– 13 C coupling. Constant-time analogs of HSQC experiments mitigate such issues …

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Effect of lignin on veneer densification and set-recovery

Catherine Kilumets, Heikko Kallakas, Sally A. Ralph, J. Y. Zhu et autres

Wood densification, aimed at enhancing mechanical properties through compression, faces challenges due to set-recovery, where densified wood regains its original shape upon re-moistening. However, understanding the role of lignin in set-recovery remains elusive. In this study, acidified sodium chlorite was applied to …

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Use of Renewable Alcohols in Autocatalytic Production of Aspen Organosolv Lignins

Biljana Bujanovic, Kolby Hirth, Sally A. Ralph, Richard Reiner et autres

This study aimed to investigate the intrinsic efficiency of renewable alcohols, applied under autocatalytic conditions, for removing lignin from aspen and hot-water-extracted aspen while substantially preserving the lignin structure so as to facilitate various valorization strategies. Ethylene glycol (EG), propylene glycol (PG), …

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NMR Database of Lignin and Cell Wall Model Compounds.

Sally A. Ralph, John Ralph, Fachuang Lu

This database was designed to provide a coherent, single source of NMR data of lignin and other plant cell wall model compounds. The database exists as an Adobe pdf cross-platform file for viewing and printing. This is the latest public version of …

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Raman Spectra of Delignified Plant Fibers: Exploring the Impact of Xylan’s Presence on the Spectral Features of Cellulose

Umesh P. Agarwal, Sally A. Ralph

Wood and plants are made of fibers that contain, in addition to cellulose, lignin and hemicelluloses. Xylan and galactoglucomannan are the dominant secondary cell wall hemicelluloses. In modern times, fibers are important materials for the biorefinery industry and for developing biocomposites. For …

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Raman Spectra of Delignified Plant Fibers: Exploring the Impact of Xylan’s Presence on Cellulose Spectral Features

Umesh P. Agarwal, Sally A. Ralph

Wood and plants are made of fibers which contain, in addition to cellulose, lignin and hemicelluloses. Xylan and galactoglucomannan are the dominant secondary cell wall hemicelluloses. Besides fibers’ traditional use in textile and paper industries, the fibers are important materials for the …

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Native state of wood cellulose: evidence that further supports its non-crystalline nature

Umesh P. Agarwal, Richard Reiner, Carlos Báez, Sally A. Ralph

Abstract Although highly desirable, the nature of wood-cellulose in its native state has remained difficult to comprehend. Contrary to the traditional acceptance of wood-cellulose being crystalline, in 2016, the authors’ research found that the cellulose was not crystalline. Here, additional evidence is …

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Lignins and Lignification

John Ralph, Hoon Kim, Fachuang Lu, Rebecca A. Smith et autres

As ever more component monomers are discovered, lignin can no longer be regarded as deriving from just the three canonical monolignols. Pathway intermediates such as the hydroxycinnamaldehydes and their derived hydroxybenzaldehydes, and additional products of truncated biosynthesis such as caffeyl and 5-hydroxyconiferyl …

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Detection and quantitation of cellulose II by Raman spectroscopy

Umesh P. Agarwal, Sally A. Ralph, Carlos Báez, Richard Reiner

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Detection and quantitation of cellulose II by Raman spectroscopy

Umesh P. Agarwal, Sally A. Ralph, Carlos Báez, Richard Reiner

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Contributions of Crystalline and Noncrystalline Cellulose Can Occur in the Same Spectral Regions: Evidence Based on Raman and IR and Its Implication for Crystallinity Measurements

Umesh P. Agarwal, Sally A. Ralph, Carlos Báez, Richard Reiner

Aggregated states of celluloses remain poorly understood, and therefore, the topic requires careful investigation. In this study, Raman, IR, and X-ray diffraction (XRDs) were used to study cotton microcrystalline cellulose (MCC) and MCC that has been ball-milled to various degrees. Raman and …

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