Structure and Some Reactions of Cellulose

Jones, David M.

doi:10.1016/s0096-5332(08)60283-0

Cited by 20 publications

(4 citation statements)

References 199 publications

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“…In contrast, the apparent crystallinity increased after acid extraction and remained high after alkali treatment. It is well known (Jones 1964) that hot acid (2 M, lOOOC) may be used to prepare standards of highly crystalline cellulose, and that the crystallinity can be significantly decreased by more concentrated acids or alkalis.…”

Section: X-ray Spectrometry and Light Microscope Observationsmentioning

confidence: 99%

Structure and properties of sugar beet fibres

Bertin¹,

Rouau²,

Thibault³

1988

J Sci Food Agric

112

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Fibrous fractions were prepared from sugar beet pulp (RF) by sequential extractions with potassium oxalate, 0.05 M hydrochloric acid at 85°C and 0.05 M sodium hydroxide at 4°C. The overall composition, polysaccharide structure and some physico-chemical properties (cation exchange capacity, CEC; water holding capacity, W H C ; swelling) of each fraction were determined. RF was mostly composed of carbohydrates (66.3 %) with minor amounts of ash, proteins and lignin. The main polysaccharides were highly methylated and acetylated pectins, cellulose and arabinans. The oxalate residue (82.1 % of RF) exhibited only minute differences from RF whereas the acidic and alkaline residues,accounting for 42.8 %and 35.5 % of RF, respectively, were enriched in cellulose and hemicelluloses (xylans, xyloglucans, mannans) and mostly devoid of pectins and arabinans. CEC and WHC of fractions were closely related to the content of unmethylated galacturonic acid residues. The influence of the ionic form of ionisable groups was demonstrated, the Na' form giving the highest WHC. The ionic strength of the medium can reduce the WHC, especially in the case of the acid-and alkali-extracted fibres.

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Section: X-ray Spectrometry and Light Microscope Observationsmentioning

confidence: 99%

Structure and properties of sugar beet fibres

Bertin¹,

Rouau²,

Thibault³

1988

J Sci Food Agric

112

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“…Cellulose, a kind of polysaccharide, is also a promising biomaterial for epidermal electronics applications. It is usually acquired from natural cotton, wood or bacteria [ 78 , 79 , 80 ]. In specific, bacterial nanocellulose (BC) extracted from bacteria has been regarded as an ideal candidate for environment-friendly epidermal electronics [ 81 , 82 ].…”

Section: Biomaterials-based Epidermal Electronicsmentioning

confidence: 99%

Recent Progress of Biomaterials-Based Epidermal Electronics for Healthcare Monitoring and Human–Machine Interaction

et al. 2023

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Epidermal electronics offer an important platform for various on-skin applications including electrophysiological signals monitoring and human–machine interactions (HMI), due to their unique advantages of intrinsic softness and conformal interfaces with skin. The widely used nondegradable synthetic materials may produce massive electronic waste to the ecosystem and bring safety issues to human skin. However, biomaterials extracted from nature are promising to act as a substitute material for the construction of epidermal electronics, owing to their diverse characteristics of biocompatibility, biodegradability, sustainability, low cost and natural abundance. Therefore, the development of natural biomaterials holds great prospects for advancement of high-performance sustainable epidermal electronics. Here, we review the recent development on different types of biomaterials including proteins and polysaccharides for multifunctional epidermal electronics. Subsequently, the applications of biomaterials-based epidermal electronics in electrophysiological monitoring and HMI are discussed, respectively. Finally, the development situation and future prospects of biomaterials-based epidermal electronics are summarized. We expect that this review can provide some inspirations for the development of future, sustainable, biomaterials-based epidermal electronics.

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“…Elution with EtOAc/PE = 2.5 : 7.5 gave compound 13 (77 mg, 88%) as a semisolid. R f 0.5 (EtOAc/PE = 5 : 5); [a] 20 D -9.25 (c 6.2, CHCl 3 ); 1 H NMR (500 MHz, CDCl 3 ) d 7.59-7.27 (m, 10H, 2 ¥ C 6 H 5 ), 5.52 (s, 1H, CHPh), 5.36 (t, J = 9.5, 1H, H-3¢), 5.29 (d, J = 4.1, 1H, H-1), 5.09 (dd, J = 9.4, 7.9, 1H, H-2¢), 5.04 (dd, J = 3.9, 2.5, 1H, H-2), 4.81 (d, J = 7.8, 1H, H-1¢), 4.47 (m, 2H, H-5, H-6), 4.42-4.32 (m, 2H, H-3, H-6¢), 4.29 (dd, J = 5.5, 2.4, 1H, H-4), 3.88 (dd, J = 10.3, 2.6, 1H, H-6), 3.80 (t, J = 10.3, 1H, H-6¢), 3.73 (t, J = 9.6, 1H, H-4¢), 3.57 (td, J = 9.7, 5.0, 1H, H-5¢), 2.12 (s, 3H, COCH 3 ), 2.06 (s, 3H, COCH 3 ), 1.91 (s, 3H, COCH 3 ); 13 [a] 20 D -16.6 (c 0.5, CHCl 3 ), 1 H NMR (500 MHz, CDCl 3 ) d 7.91-7.01 (m, 10H, 2 ¥ Ph), 5.47 (s, 1H, CHPh), 5.38 (dd, J = 4.0, 1.9, 1H), 5.31 (t, J = 9.5, 1H), 5.08-4.97 (m, 1H), 4.75 (d, J = 7.8, 1H), 4.58 (d, J = 4.1, 1H), 4.46 (t, J = 2.9, 1H), 4.32 (dt, J = 8.4, 4.1, 2H), 4.25 (dd, J = 5.5, 2.0, 1H), 4.12 (t, J = 8.4, 1H), 3.98 (dd, J = 10.9, 2.9, 1H), 3.70 (dt, J = 19.0, 9.9, 2H), 3.58-3.43 (m, 1H), 2.03 (s, 4H), 1.94 (s, 3H), 1.66 (s, 3H). 13…”

Section: -Thiophenyl-23-diacetyl-6-o-tosyl-4-o-(2¢3¢di-o-acetyl-4¢6¢-...mentioning

confidence: 99%

“…Cellulose is the most abundant organic molecule in the biosphere constituting up to 50% of biomass such as wood and straw. 1 The tremendous amount of cellulose available makes it a highly interesting molecule for exploitation, be it conversion to food, energy or materials. 2 At present the use of cellulose for materials such as paper and clothes is well established, but the use of cellulosic biomass for chemicals is more difficult, but would nevertheless be of high interest.…”

Section: Introductionmentioning

confidence: 99%

A study of anhydrocelluloses – Is a cellulose structure with residues in a 1C4-conformation more prone to hydrolysis?

2011

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A study of the effect of introduction of 3,6-anhydroglucose residues in the cellulose structure on glycoside hydrolysis rate was performed. A cellotetrose with an 3,6-anhydroglucose as the third residue was synthesised. Acidic hydrolysis of this tetrasaccharide showed that hydrolysis of the 3,6-anhydro-β-D-glucoside linkage was 31.400 times faster than hydrolysis of cellobiose. A series of different 3,6-anhydrocelluloses with different degree of substitution were prepared by tosylation of cellulose with varying amounts of tosyl chloride in dimethylacetamide and subsequent treatment with sodium hydroxide. Anhydrocelluloses with degrees of substitution of 0.02, 0.07, 0.31 and 0.74 were obtained. The anhydrocelluloses were subjected to acidic hydrolysis in 2.0 M aqueous HCl and the rate of hydrolysis monitored by ion chromatography analysis of the amount of glucose and/or cellobiose formed. All 3,6-anhydrocelluloses hydrolyzed with a faster rate than cellulose, but the anhydrocellulose with a low degree of substitution (ds = 0.07) hydrolyzed fastest which was 90 times faster than cellulose.

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Structure and Some Reactions of Cellulose

Cited by 20 publications

References 199 publications

Structure and properties of sugar beet fibres

Structure and properties of sugar beet fibres

Recent Progress of Biomaterials-Based Epidermal Electronics for Healthcare Monitoring and Human–Machine Interaction

A study of anhydrocelluloses – Is a cellulose structure with residues in a 1C4-conformation more prone to hydrolysis?

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