Preparation and Characterization of Wheat Straw Hemicellulosic Succinates

Sun, Run‐Cang; Min, Sun; Sun, Xaio-Feng

doi:10.1080/10236660214602

Cited by 14 publications

(5 citation statements)

References 16 publications

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“…In previous studies, succinoylated XH with lower DS (0.21) were also prepared in aqueous solution, indicating the low efficiency mainly was ascribed to the heterogeneous reaction system in aqueous solution. While the succinoylation was carried out in homogeneous N, N-dimethylformamide/lithium chloride (DMF/LiCl) systems, and the highest DS of 1.67 and 1.39 could be obtained when the reaction ran for 12 h and 2 h, respectively [10]. Comparatively, in this study, products with a maximum DS value of 1.80 could be obtained in a much shorter time scale (40 min) in [BMIM]Cl IL.…”

Section: Resultsmentioning

confidence: 62%

“…The results of variation in reaction temperatures were shown in Fig. 3, there was an increment in the DS as the reaction temperature increased from 70 o C to 100 o C, and a maximum DS of 1.75 was obtained under the reaction temperature of 100 o C. The increase may be due to the fact that there is better reaction environment created for modification, which was favored to diffusion of the esterifying reagent and mobility of the reactant molecules of XH [9,10]. The decrease in the DS beyond 100 o C may be due to the degradation of XH and the occurrence of side reaction.…”

Section: Resultsmentioning

confidence: 98%

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Functional Modification of Xylan-Rich Hemicelluloses in Ionic Liquid

Peng

Ren

Zhong

et al. 2011

AMR

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Xylan-rich Hemicelluloses (XH) isolated from wheat straw were converted to functional biopolymers by modification using succinic anhydride (SA) as reactant without catalyst in 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) ionic liquid. The reaction was performed under various conditions such as different temperatures, different times, and the different amounts of SA, and the effect of reaction factors on the degree substitution (DS) of products were discussed. The product had the maximum DS of 1.80. The structure of modified hemicellulosic derivatives (MD) was actually confirmed by13C NMR spectroscopy. The thermal behavior of MD was monitored by means of thermogravimetry (TG) and differential thermal analysis (DTA), and the thermal stability of MD was lower than XH.

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Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 98%

Functional Modification of Xylan-Rich Hemicelluloses in Ionic Liquid

Peng

Ren

Zhong

et al. 2011

AMR

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“…Low-purity hemicellulose contains impurities, such as other polysaccharides, proteins, or lignin, which compete with or hinder the contact of the modifying agents with hemicellulose molecules. High-purity hemicellulose provides more reactive sites, such as free hydroxyl groups, allowing for a more complete chemical modification [ 31 , 32 ]. Common chemical modification methods include etherification, esterification, and copolymerization [ 33 , 34 ].…”

Section: Modification Of Gobpsmentioning

confidence: 99%

“…Under optimal conditions (85 °C, 60 h), approximately 75% of the free hydroxyl groups in hemicellulose were acetylated. Sun, Min, and Sun [ 31 ] used pyridine as a catalyst to esterify wheat straw hemicelluloses. The optimal DS was 1.67.…”

Section: Modification Of Gobpsmentioning

confidence: 99%

Valorization of Grain and Oil By-Products with Special Focus on Hemicellulose Modification

Liu,

Xie,

Jacquet

et al. 2024

Polymers

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Hemicellulose is one of the most important natural polysaccharides in nature. Hemicellulose from different sources varies in chemical composition and structure, which in turn affects the modification effects and industrial applications. Grain and oil by-products (GOBPs) are important raw materials for hemicellulose. This article reviews the modification methods of hemicellulose in GOBPs. The effects of chemical and physical modification methods on the properties of GOBP hemicellulose biomaterials are evaluated. The potential applications of modified GOBP hemicellulose are discussed, including its use in film production, hydrogel formation, three-dimensional (3D) printing materials, and adsorbents for environmental remediation. The limitations and future recommendations are also proposed to provide theoretical foundations and technical support for the efficient utilization of these by-products.

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“…Recent studies on the modification of hemicelluloses in our laboratory have demonstrated that these polymers can be modified by means of esterification reactions to afford conventional thermoplastics 11, 12. Moreover, previous reports have described the esterification of hemicelluloses carried out in the presence of 4‐dimethylaminopyridine (DMAP) as co‐catalyst 13.…”

Section: Introductionmentioning

confidence: 99%

Oleoylation of sugarcane bagasse hemicelluloses using N‐bromosuccinimide as a catalyst

Sun¹,

Sun

Sun³

2004

J Sci Food Agric

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Conditions for the preparation of esters of sugarcane bagasse hemicelluloses with oleoyl chloride using N-bromosuccinimide (NBS) as a catalyst in the N,N-dimethylformamide/lithium chloride system under mild conditions were studied comparatively. The oleoylation was followed in terms of yield and degree of substitution (DS). The parameters optimised included oleoyl chloride concentration as the molar ratio of oleoyl chloride/anhydroxylose units in native hemicelluloses (1:1-8:1), NBS concentration (0.5-3.0%), reaction time (20-100 min) and reaction temperature (30-100 • C). Results were also compared with those for other catalysts such as H 2 SO 4 and four tertiary amine catalysts, pyridine, 4-dimethylaminopyridine, N-methyl pyrrolidine and N-methyl pyrrolidinone. An oleoyl chloride/hemicellulose molar ratio of 3:1 was found to be necessary for the reaction to proceed smoothly and to yield a product with a low DS. The new materials were characterised by FT-IR and 1 H and 13 C NMR spectroscopies as well as thermal analysis. The thermal stability of the oleoylated hemicelluloses decreased slightly upon chemical modification, but no significant further decrease in thermal stability was observed for DS ≥ 0.29.

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Preparation and Characterization of Wheat Straw Hemicellulosic Succinates

Cited by 14 publications

References 16 publications

Functional Modification of Xylan-Rich Hemicelluloses in Ionic Liquid

Functional Modification of Xylan-Rich Hemicelluloses in Ionic Liquid

Valorization of Grain and Oil By-Products with Special Focus on Hemicellulose Modification

Oleoylation of sugarcane bagasse hemicelluloses using N‐bromosuccinimide as a catalyst

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