A supramolecular structure insight for conversion property of cellulose in hot compressed water: Polymorphs and hydrogen bonds changes

Wang, Yan; Lian, Jie; Wan, Jinquan; Ma, Yuanyuan; Zhang, Yingshi

doi:10.1016/j.carbpol.2015.06.110

Cited by 17 publications

(6 citation statements)

References 42 publications

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“…Meanwhile, the crystal structure of the native C -type starch was converted to the B -type ( Figure 3 d). The observed phenomenon is typical of amorphocrystalline polymers such as cellulose [ 25 , 42 ].…”

Section: Resultsmentioning

confidence: 99%

Comprehensive Enzymatic Conversion of Starch for the Food Industry

et al. 2022

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This study demonstrated the feasibility of comprehensive enzymatic conversion of starch for non-waste applications in food industry. Enzymatic conversion of starch gives rise to nano-sized particles that can be used for manufacturing biodegradable and edible packaging materials and glucose syrup for replacing sugar in confectionery formulations. The 96 h enzymatic hydrolysis yielded starch nanoparticles smaller than 100 nm. Films based on nano-sized starch particles have promising physicochemical properties for manufacturing biodegradable and edible packaging materials. Such properties as reduced moisture content, increased homogeneity, crystallinity, and high initial thermal stability improve the mechanical and performance characteristics of the final food packaging materials. During film formation from starch subjected to preliminary mechanical amorphization, the polymer chain is recrystallized. The C-type crystal structure of starch is converted to the B-type structure. The supernatant obtained by starch hydrolysis can be used for producing glucose syrup. The resulting glucose syrup can be used as a sugar substitute in production of confectionery products. No objective technological differences in properties of glucose syrup obtained by comprehensive conversion of starch and the commercially available glucose syrup derived from sucrose were revealed.

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Section: Resultsmentioning

confidence: 99%

Comprehensive Enzymatic Conversion of Starch for the Food Industry

et al. 2022

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“…As mentioned previously, the cavitation phenomenon produced by ultrasonication creates localized hot spots (Noltingk and Neppiras 1950). Therefore, we hypothesized that the high localized temperature/pressure attained by cavitation, which is higher than the cracking temperature of intermolecular hydrogen bonds in cellulose I a (200°C) (Wada et al 2003) and cellulose I b (230°C) (Wada et al 2010) induced the thermal expansion of the crystal lattice with the formation of a ''high temperature intermediate'' structure (Wang et al 2015). During the cooling process, the barrier to the formation of I b is much smaller than that to the formation of I a , and hence, kinetics favor the formation of I b (Matthews et al 2012), resulting in the transformation from the I a phase to the I b phase.…”

Section: Ftir Studiesmentioning

confidence: 86%

Stable microfluidized bacterial cellulose suspension

et al. 2019

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In this work, nanofibrillated suspensions of bacterial cellulose (BC) were produced via microfluidization. The effects of the size of the openings of the microfluidizer chamber and ultrasonication on the nanofibril properties were evaluated. The results of the X-ray diffraction analysis indicated a considerable reduction in BC crystallinity (86-65%) and crystallite size (5.8-4.0 nm) after microfluidization and ultrasonication. Thermal analysis showed a remarkable reduction from 337 to 283°C in the initial temperature of degradation along the several steps of BC deconstruction. Moreover, infrared analysis indicated that both processes led to an increase in the I b content (43-66%) of the fibers. Morphological analysis showed that the fibrillation process used exposed the internal faces of the ribbon-like nanofibrils, and thus, increased the surface area of the cellulose network, and produced fibers with a high aspect ratio (L/d). A thermally stable nanofibrillated suspension could be obtained by adding carboxymethyl cellulose as a simple and effective way to maintain cellulose fibers dispersed in the solution during sterilization by autoclaving.

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“…Cellulose has a fibrous structure, which on a nanoscale scale, presents properties that are affordable to the composition of various products, including giving reinforcement to polymers. 9 Some studies have shown that nanoscale materials present chemical, physical and biological properties, to be used as fillers, presenting excellent mechanical properties and can be produced by different raw materials, such as clays and cellulose. 10 Palm oil is composed by palmitic, oleic, and linoleic acids, as well as other oils from renewable sources.…”

Section: Introductionmentioning

confidence: 99%

Green compounds of SBR with nanofibrilated cellulose and palm oil in replacement to traditionally compounds used

Ribeiro

Damo

Zattera

et al. 2022

Journal of Elastomers & Plastics

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Silica and carbon black (CB) are the most used reinforcement fillers in elastomeric compositions; however, their obtention and usage might result in environmental and human health damages. The same happens to the plasticizers used in elastomeric compounds, which contain a high content of polycyclic aromatics. To use reinforcement and plasticizer loads from natural sources, the performance of an elastomeric compound by partially replacing CB with nanofibrillated cellulose (CEL) provided with Eucalyptus spp. shavings was evaluated in this work, as well as, the use of palm oil to replace aromatic oils. Nanofibrilated cellulose was obtained by grinding in a micronizing mill. As a characterization of the raw material, the thermal, chemical and morphological properties, as well as particle size analysis of the cellulose suspension were evaluated by the particle size analyzer. From the vulcanized material, the physical, mechanical, dynamic-mechanical properties, cross-link density, and swelling index in solvents were evaluated. As the main results obtained, the presence of CEL clusters seen by scanning electron microscopy with nanofibers with diameters of 100–85 nm was observed. The dynamic light scattering particle size analyzers (DLS) showed nanoparticles from 1 to 100 nm. The rheometric properties showed lower values for the parameters of safety time, optimal vulcanization time, and maximum and minimum torques when compared to samples with CEL as CB. For tear resistance properties, samples with the presence of nanofibrilated cellulose showed 48% more resistance than samples with CB, in the modulus of elasticity, cross-link density, and swelling index, a better performance was also achieved for the samples with CEL, along with presenting a similar behavior in the hardness property between samples with the presence of nanofibrillates and those with CB. Palm oil, a substitute for aromatic oil, was found to be similar in the evaluated properties results, with interaction with CEL, by chemical affinity, which can replace aromatic oil.

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A supramolecular structure insight for conversion property of cellulose in hot compressed water: Polymorphs and hydrogen bonds changes

Cited by 17 publications

References 42 publications

Comprehensive Enzymatic Conversion of Starch for the Food Industry

Comprehensive Enzymatic Conversion of Starch for the Food Industry

Stable microfluidized bacterial cellulose suspension

Green compounds of SBR with nanofibrilated cellulose and palm oil in replacement to traditionally compounds used

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