Chromophores from hexeneuronic acids: chemical behavior under peroxide bleaching conditions

Zwirchmayr, Nele Sophie; Hosoya, Takashi; Bacher, Markus; Krainz, Karin; Dietz, Thomas H.; Henniges, Ute; Potthast, Antje; Rosenau, Thomas

doi:10.1007/s10570-017-1398-3

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…The reason was mainly due to the darker color of lignin chromophore from the repolymerization of the lignin fragment from the depolymerization process when heating at 200 and 220 °C. It was reported that the main lignin chromophore found in lignocellulose was 2,5-dihydroxy-[1,4]-benzoquinone (DHBQ), and a minor component, 2,5-dihydroxyacetophenone (DHA), while hexeneuronic acids (HexA) were found to cause discoloration (yellowing/brightness reversion) in cellulose pulps from xylan-containing biomass [ 28 ]. We adopted the L × a × b color measurement approach [ 29 ], as shown in Table S3 .…”

Section: Resultsmentioning

confidence: 99%

Cryo-Induced Cellulose-Based Nanogel from Elaeis guineensis for Antibiotic Delivery Platform

Hajidariyor

Nuntawad

Somsaen

et al. 2023

IJMS

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Cryo-induced hydrogel from cellulose is a new class of biomaterials for drug delivery, cell delivery, bone and skin tissue engineering for cell proliferation and regeneration applications. This research aimed to synthesize cryo-induced hydrogel from cellulose and carboxymethyl cellulose (CMC) produced from empty bunch’s cell wall of Elaeis guineensis. First, the experiment was to produce cellulose-rich material using hot-compressed water extraction followed by alkaline delignification and bleaching with H2O2. The obtained bleached EFB cellulose was used as the substrate for CMC, and the optimal condition with the highest degree of carboxyl substitution (DS) of 0.75 was achieved when varying NaOH and monochloroacetic acid concentration as well as etherification temperature using fractional factorial design. For cryogelation study, hydrogels were synthesized from cellulose, CMC and beta-cyclodextrin (β-CD) by dissolving cellulose-based matrix in a NaOH/urea system, and the cellulose (CEL) solution was frozen spontaneously at −40 °C followed by high speed mixing to loosen cellulose fibrils. Epichlorohydrin (ECH) and Polyethylene glycol diglycidyl ether (PEGDE) were used as a cross-linker. First, the ratio of cellulose and CMC with different amounts of ECH was investigated, and subsequently the proper ratio was further studied by adding different crosslinkers and matrices, i.e., CMC and β-CD. From the result, the ECH crosslinked CMC-CEL (E-CMC-CEL) gel had the highest swelling properties of 5105% with the average pore size of lyophilized hydrogel of 300 µm. In addition, E-CMC-CEL gel had the highest loading and release capability of tetracycline in buffer solution at pH 7.4 and 3.2. At pH 7.4, tetracycline loading and release properties of E-CMC-CEL gel were 65.85 mg g−1 dry hydrogel and 46.48 mg g−1 dry hydrogel (70.6% cumulative release), respectively. However, at pH 3.2, the loading and release capabilities of Tetracycline were moderately lower at 16.25 mg g−1 dry hydrogel and 5.06 mg g−1 dry hydrogel, respectively. The findings presented that E-CMC-CEL hydrogel was a suitable material for antibiotic tetracycline drug carrying platform providing successful inhibitory effect on Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, respectively.

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Section: Resultsmentioning

confidence: 99%

Cryo-Induced Cellulose-Based Nanogel from Elaeis guineensis for Antibiotic Delivery Platform

Hajidariyor

Nuntawad

Somsaen

et al. 2023

IJMS

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“…4 (a). 64,65 This molecule is composed of four furane (F) units bridged by six CO (C) units and we will denote 3 F, derived from hexeneuronic acid, is found in cellulosic pulps where it is a cause for discolouration. 64 While this discolouration is unwanted in cellulose one may ponder whether this strongly absorbing chromophore 64 may ultimately be used as a basis for optoelectronic applications and we will proceed to study its electronic structure here.…”

Section: Visualisation Of Correlation Effects In Large Conjugated mentioning

confidence: 99%

TheoDORE: A toolbox for a detailed and automated analysis of electronic excited state computations

Plasser

2020

The Journal of Chemical Physics

325

354

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The advent of ever more powerful excited-state electronic structure methods has lead to a tremendous increase in the predictive power of computation but it has also rendered the analysis of these computations more and more challenging and time-consuming. TheoDORE tackles this problem through providing tools for post-processing excited-state computations, which automate repetitive tasks and provide rigorous and reproducible descriptors. Interfaces are available for ten different quantum chemistry codes and a range of excited-state methods implemented therein. This article provides an overview of three popular functionalities within TheoDORE, a fragment-based analysis for assigning state character, the computation of exciton sizes for measuring charge transfer, and the natural transition orbitals used not only for visualisation but also for quantifying multiconfigurational character. Using the examples of an organic push-pull chromophore and a transition metal complex, it is shown how these tools can be used for a rigorous and automated assignment of excited-state character. In the case of a conjugated polymer, we venture beyond the limits of the traditional molecular orbital picture to uncover spatial correlation effects using electron-hole correlation plots and conditional densities.

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“…OH and . OOH) continue to react with unreacted hydrogen peroxide, decomposing it and generating perhydroxyl radicals until all hydrogen peroxide molecules are consumed, resulting in water and oxygen as the final products 50 , 51 . However, in the presence of pigments, electrons are abstracted from the chromogens, leading to their breakdown in a redox reaction, thereby reducing their optical absorption 50 .…”

Section: Resultsmentioning

confidence: 99%

Isolation, characterization and response surface method optimization of cellulose from hybridized agricultural wastes

Rasheed,

Adeleke,

Nzerem

et al. 2024

Sci Rep

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This study explores the utilization of eight readily available agricultural waste varieties in Nigeria—sugarcane bagasse, corn husk, corn cob, wheat husk, melina, acacia, mahogany, and ironwood sawdust—as potential sources of cellulose. Gravimetric analysis was employed to assess the cellulose content of these wastes, following which two selected wastes were combined based on their cellulose content and abundance to serve as the raw material for the extraction process. Response Surface Methodology, including Box-Behnken design, was applied to enhance control over variables, establish an optimal starting point, and determine the most favorable reaction conditions. The cellulose extracted under various conditions was comprehensively examined for content, structure, extent of crystallinity, and morphological properties. Characterization techniques such as X-ray Diffraction, Scanning Electron Microscopy, and Fourier Transform Infrared Spectroscopy were employed for detailed analysis. Compositional analysis revealed sugarcane bagasse and corn cob to possess the highest cellulose content, at 41 ± 0.41% and 40 ± 0.32% respectively, with FTIR analysis confirming relatively low C=C bond intensity in these samples. RSM optimization indicated a potential 46% isolated yield from a hybrid composition of sugarcane bagasse and corn cob at NaOH concentration of 2%, temperature of 45 °C, and 10 ml of 38% H2O2. However, FTIR analyses revealed the persistence of non-cellulosic materials in this sample. Further analysis demonstrated that cellulose isolated at NaOH concentration of 10%, temperature of 70 °C, and 20 ml of 38% H2O2 was of high purity, with a yield of 42%. Numerical optimization within this extraction condition range predicted a yield of 45.6% at NaOH concentration of 5%, temperature of 45 °C, and 20 ml of 38% H2O2. Model validation confirmed an actual yield of 43.9% at this condition, aligning closely with the predicted value. These findings underscore the significant potential of combinning and utilizing agricultural wastes as a valuable source of cellulose, paving the way for sustainable and resource-efficient practices in various industrial applications.

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Chromophores from hexeneuronic acids: chemical behavior under peroxide bleaching conditions

Cited by 9 publications

References 16 publications

Cryo-Induced Cellulose-Based Nanogel from Elaeis guineensis for Antibiotic Delivery Platform

Cryo-Induced Cellulose-Based Nanogel from Elaeis guineensis for Antibiotic Delivery Platform

TheoDORE: A toolbox for a detailed and automated analysis of electronic excited state computations

Isolation, characterization and response surface method optimization of cellulose from hybridized agricultural wastes

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