Enzymatic Degradation and Pilot-Scale Composting of Cellulose-Based Films with Different Chemical Structures

Leppänen, Ilona; Vikman, Minna; Harlin, Ali; Orelma, Hannes

doi:10.1007/s10924-019-01621-w

Cited by 63 publications

(52 citation statements)

References 51 publications

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“…The physical properties and biodegradability of CA are strongly dependent on its degree of substitution (DS), which corresponds to the number of acetyl groups per monomer (<3.0; Yadav & Hakkarainen, 2021). The acetyl groups of CA inhibit biodegradation mediated by cellulase, which hydrolyzes the -1,4-glucoside linkages of cellulose, owing to steric interference (Leppa ¨nen et al, 2020;Takeda et al, 2016). Therefore, the deacetylation of CA is an essential step in facilitating its biodegradation.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of acetylxylan esterase from Caldanaerobacter subterraneus subsp. tengcongensis

et al. 2021

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The acetylxylan esterases (AXEs) classified into carbohydrate esterase family 4 (CE4) are metalloenzymes that catalyze the deacetylation of acetylated carbohydrates. AXE from Caldanaerobacter subterraneus subsp. tengcongensis (TTE0866), which belongs to CE4, is composed of three parts: a signal sequence (residues 1–22), an N-terminal region (NTR; residues 23–135) and a catalytic domain (residues 136–324). TTE0866 catalyzes the deacetylation of highly substituted cellulose acetate and is expected to be useful for industrial applications in the reuse of resources. In this study, the crystal structure of TTE0866 (residues 23–324) was successfully determined. The crystal diffracted to 1.9 Å resolution and belonged to space group I212121. The catalytic domain (residues 136–321) exhibited a (β/α)7-barrel topology. However, electron density was not observed for the NTR (residues 23–135). The crystal packing revealed the presence of an intermolecular space without observable electron density, indicating that the NTR occupies this space without a defined conformation or was truncated during the crystallization process. Although the active-site conformation of TTE0866 was found to be highly similar to those of other CE4 enzymes, the orientation of its Trp264 side chain near the active site was clearly distinct. The unique orientation of the Trp264 side chain formed a different-shaped cavity within TTE0866, which may contribute to its reactivity towards highly substituted cellulose acetate.

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Section: Introductionmentioning

confidence: 99%

Crystal structure of acetylxylan esterase from Caldanaerobacter subterraneus subsp. tengcongensis

et al. 2021

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“…[ 50 ] Leppänen et al. [ 73 ] observed lower transmittance for pure regenerated cellulose films in comparison to those from a cellulose polymer derivative, possibly related to larger gaps between the derivatized cellulose chains substituted with methyl, ethyl, or carboxymethyl groups. [ 73 ]…”

Section: Lignocellulosic Films For Engineered Light Managementmentioning

confidence: 99%

Plant‐Based Structures as an Opportunity to Engineer Optical Functions in Next‐Generation Light Management

et al. 2021

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This review addresses the reconstruction of structural plant components (cellulose, lignin, and hemicelluloses) into materials displaying advanced optical properties. The strategies to isolate the main building blocks are discussed, and the effects of fibrillation, fibril alignment, densification, self‐assembly, surface‐patterning, and compositing are presented considering their role in engineering optical performance. Then, key elements that enable lignocellulosic to be translated into materials that present optical functionality, such as transparency, haze, reflectance, UV‐blocking, luminescence, and structural colors, are described. Mapping the optical landscape that is accessible from lignocellulosics is shown as an essential step toward their utilization in smart devices. Advanced materials built from sustainable resources, including those obtained from industrial or agricultural side streams, demonstrate enormous promise in optoelectronics due to their potentially lower cost, while meeting or even exceeding current demands in performance. The requirements are summarized for the production and application of plant‐based optically functional materials in different smart material applications and the review is concluded with a perspective about this active field of knowledge.

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“…Cellulase is known as the specific enzyme functioning to break down the cellulose that converts the cellobiose to glucose molecules [ 127 ]. There are two types of cellulases known as endocellulase, and exocellulase or cellobiohydrolases, where the former cleaves the internal bond, and the latter degrades the reducing and non-reducing ends of cellulose chains [ 128 ]. For instance, RC hydrogel used as the crop plantation medium must have a long degradation time to sustain the plantation for up to four months.…”

Section: The Potential Applications Of Regenerated Cellulose Products For Agriculturementioning

confidence: 99%

Regenerated Cellulose Products for Agricultural and Their Potential: A Review

et al. 2021

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Cellulose is one of the most abundant natural polymers with excellent biocompatibility, non-toxicity, flexibility, and renewable source. Regenerated cellulose (RC) products result from the dissolution-regeneration process risen from solvent and anti-solvent reagents, respectively. The regeneration process changes the cellulose chain conformation from cellulose I to cellulose II, leads the structure to have more amorphous regions with improved crystallinity, and inclines towards extensive modification on the RC products such as hydrogel, aerogel, cryogel, xerogel, fibers, membrane, and thin film. Recently, RC products are accentuated to be used in the agriculture field to develop future sustainable agriculture as alternatives to conventional agriculture systems. However, different solvent types and production techniques have great influences on the end properties of RC products. Besides, the fabrication of RC products from solely RC lacks excellent mechanical characteristics. Thus, the flexibility of RC has allowed it to be homogenously blended with other materials to enhance the final products’ properties. This review will summarize the properties and preparation of potential RC-based products that reflect its application to replace soil the plantation medium, govern the release of the fertilizer, provide protection on crops and act as biosensors.

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Enzymatic Degradation and Pilot-Scale Composting of Cellulose-Based Films with Different Chemical Structures

Cited by 63 publications

References 51 publications

Crystal structure of acetylxylan esterase from Caldanaerobacter subterraneus subsp. tengcongensis

Crystal structure of acetylxylan esterase from Caldanaerobacter subterraneus subsp. tengcongensis

Plant‐Based Structures as an Opportunity to Engineer Optical Functions in Next‐Generation Light Management

Regenerated Cellulose Products for Agricultural and Their Potential: A Review

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