Supercritical water treatment for cello-oligosaccharide production from microcrystalline cellulose

Tolonen, Lasse; Juvonen, M.; Niemelä, Klaus; Mikkelson, Atte; Tenkanen, Maija; Sixta, Herbert

doi:10.1016/j.carres.2014.10.012

Cited by 52 publications

(46 citation statements)

References 37 publications

(65 reference statements)

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“…Microsecond sc-H 2 O-extracted cellulose (DP n = 7.76, DP w = 10.83, PDI = 1.39) was prepared according to ap ublished procedure. [40] PHK pulp (Eucalyptus urograndis, DP n = 433.09, DP w = 1388.30, PDI = 3.21) was obtained from Bahia Specialty Cellulose, Brazil. Borregaard Super VS (Softwood Sulfite) dissolving pulp (DP n = 675.28, DP w = 4744.43, PDI = 7.06) was obtained from Borregaard, Norway.C otton linters (DP n = 513, DP w = 1254, PDI = 2.44), acid-(DP n = 249, DP w = 732, PDI = 2.0) and cellulose enzyme-hydrolysed cotton (DP n = 487, DP w = 996, PDI = 2.93) were provided by Shirin Asaadi at Aalto University.M ild hot/waterextracted Norway spruce GGM was ag ift from Stefan Willfçr at bo Akademi University and was prepared as described previously.…”

Section: Methodsmentioning

confidence: 99%

Solution‐State One‐ and Two‐Dimensional NMR Spectroscopy of High‐Molecular‐Weight Cellulose

et al. 2016

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High-molecular-weight celluloses (which even include bacterial cellulose) can be dissolved fully in methyltrioctylphosphonium acetate/[D6 ]DMSO solutions to allow the measurement of resonance-overlap-free 1 D and 2 D NMR spectra. This is achieved by a simple and non-destructive dissolution method, without solvent suppression, pre-treatment or deuteration of the ionic component. We studied a range of cellulose samples by using various NMR experiments to make an a priori assignment of the cellulose resonances. Chain-end resonances are also visible in the (1) H NMR spectrum. This allows the rough determination of the degree of polymerisation (DP) of a sample for low-DP celluloses by the integration of non-reducing chain ends C1 versus polymeric cellobiose C1. Low-DP celluloses show a good agreement with the gel-permeation chromatography (GPC) values, but high-DP pulps show more deviation. For high-purity pulps (pre-hydrolysis kraft and sulfite), residual xyloses and mannoses can also be identified from the (1) H-(13) C heteronuclear single-quantum coherence (HSQC) spectra. Resonances are thus assigned for the common polymeric polysaccharides found in chemical pulps.

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Section: Methodsmentioning

confidence: 99%

Solution‐State One‐ and Two‐Dimensional NMR Spectroscopy of High‐Molecular‐Weight Cellulose

et al. 2016

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“…The hydrolysis in nearcritical and supercritical water leads to the formation of LMWC and COS with a wide DP range as well as glucose, the final depolymerization product 124 . In contrast, under subcritical conditions at temperatures below 250 °C, no LMWC formation could be observed 125 .…”

Section: Cellulose Hydrolysismentioning

confidence: 99%

The chemical-free production of nanocelluloses from microcrystalline cellulose and their use as Pickering emulsion stabilizer

Buffière

Balogh-Michels

Borrega

et al. 2017

Carbohydrate Polymers

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This paper takes a comparative approach in characterizing two types of nano-scale cellulosic particles obtained using chemical-free pathways, either by nearcritical water treatment or by high-shear homogenization from the same microcrystalline cellulose (MCC). The nearcritical water treatment efficiently depolymerized cellulose, producing a solid precipitated fraction of low-molecular-weight material containing cellulose II, while homogenization mechanically deconstructed MCC without altering its molecular structure. Both pathways yielded nanocellulose-like materials yet with different morphologies. The mechanically produced, rod-like particles were obtained with high yield. In contrast, the hydrothermal precipitate exhibited more hydrophobic ribbon-like particles that provided a greater level of particle-particle interaction. Both materials successfully acted as stabilizers for oil-in-water Pickering emulsions; however, the hydrothermally-produced material exhibited superior performance, with stable emulsions obtained upon addition of as low as 1.0wt.% cellulose. These two pathways are highly relevant for altering the structure and properties of MCC and for formulating new, sustainably produced nanocellulose-based materials.

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“…A 40% yield of cellulose oligomers was reached with DP from 1 to 5 after a treatment at 380 °C for 16 s . More recently, cellulose oligomers with DP from 2 to 9 were obtained with a 42% yield after treatment with supercritical water at 380 °C and 250 bar (25 MPa) for 0.4 s …”

Section: Hot Compressed Water/supercritical Watermentioning

confidence: 99%

Water-soluble cellulose oligomer production by chemical and enzymatic synthesis: a mini-review

et al. 2017

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This mini‐review focuses on the production of water‐soluble cellulose oligomers. They are easier to handle than cellulose while still having some very interesting cellulose features. Their production is not trivial and they are thus seldom commercially available or are available at high prices and only in small quantities (100 mg or less). The goal of this mini‐review is to describe various routes to obtain these cellulose oligomers. Several examples of chemical or enzymatic synthesis and enzymatic or acidic depolymerization are presented. All the pathways considered are then compared according to several criteria: polymerization degree, yield, availability and cost of reagents, reaction time, etc. As most of the pathways produce a mixture of cellulose oligomers, techniques to separate them according to their length are also discussed. © 2017 Society of Chemical Industry

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Supercritical water treatment for cello-oligosaccharide production from microcrystalline cellulose

Cited by 52 publications

References 37 publications

Solution‐State One‐ and Two‐Dimensional NMR Spectroscopy of High‐Molecular‐Weight Cellulose

Solution‐State One‐ and Two‐Dimensional NMR Spectroscopy of High‐Molecular‐Weight Cellulose

The chemical-free production of nanocelluloses from microcrystalline cellulose and their use as Pickering emulsion stabilizer

Water-soluble cellulose oligomer production by chemical and enzymatic synthesis: a mini-review

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