New findings about the lipase acetylation of nanofibrillated cellulose using acetic anhydride as acyl donor

Božič, Mojca; Vivod, Vera; Kavčič, Sabina; Leitgeb, Maja; Kokol, Vanja

doi:10.1016/j.carbpol.2015.02.061

Cited by 47 publications

(17 citation statements)

References 31 publications

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“…Co-solvents 1-butyl-3-methyl-imidazoliumhexafluorophosphate and acetic anhydride were successfully employed, allowing the original NFC morphology and crystallinity to be preserved.These chemical acetylation methods use expensive and/or corrosive chemicals, which raise concerns over the sustainability of the whole process. Recently, acetylation of nanofibrillated cellulose using acetic anhydride as an acyl doner has reported using enzyme lipase from Aspergillus niger166 . Enzymatic acetylation on NFC yielded much higher hydophobicity (contact angle of 84±9°) compared to chemical acetylation (contact angle of 33±3°)166 .…”

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confidence: 99%

“…Recently, acetylation of nanofibrillated cellulose using acetic anhydride as an acyl doner has reported using enzyme lipase from Aspergillus niger166 . Enzymatic acetylation on NFC yielded much higher hydophobicity (contact angle of 84±9°) compared to chemical acetylation (contact angle of 33±3°)166 . Transesterification of cellulose using acylating agents such as vinyl propionate and vinyl acrylate can make the surfaces of nanocellulose hydrophobic as demonstrated by increased contact angles…”

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confidence: 99%

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Nanocellulose, a Versatile Green Platform: From Biosources to Materials and Their Applications

Thomas¹,

Raj²,

B³

et al. 2018

Chem. Rev.

1,271

752

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With increasing environmental and ecological concerns due to the use of petroleum based chemicals and products, the synthesis of fine chemicals and functional materials from natural resources is of great public value. Nanocellulose may prove to be one of the most promising green materials of modern times due to its intrinsic properties, renewability and abundance. In this review, we present nanocellulose-based materials from sourcing, synthesis, and surface modification of nanocellulose, to materials formation and applications. Nanocellulose can be sourced from biomass, plants or bacteria, relying of fairly simple, scalable and efficient isolation techniques. Mechanical, chemical, enzymatic treatments, or a combination of these, can be used to extract nanocellulose from natural sources. The properties of nanocellulose are dependent on the source, the isolation technique and potential subsequent surface transformations. Nanocellulose surface modification techniques are typically used to introduce either charged or hydrophobic moieties, and include: amidation, esterification, etherification, silylation, polymerization, urethanization, sulfonationand phosphorylation. Nanocellulose has excellent strength, Young's modulus, biocompatibility, and tunable self-assembly, thixotropic and photonic properties, which are essential for the applications of this material. Nanocellulose participates in the fabrication of a large range of nanomaterials and nanocomposites, including those based on polymers, metals, metal oxides and carbon. In particular, nanocellulose complements organic-based materials, where it imparts its mechanical properties to the composite. Nanocellulose is a promising material whenever material strength, flexibility and/or specific nanostructuring are required. Applications include functional paper, optoelectronics and antibacterial coatings, packaging, mechanically reinforced polymer composites, tissue scaffolds, drug delivery, biosensors, energy storage, catalysis, environmental remediation and 3 electrochemical controlled separation. Phosphorylated nanocellulose is a particularly interesting material, spanning a surprising set of applications in various dimensions including bone scaffolds, adsorbents, flame retardants and as a support for the heterogenization of homogeneous catalysts.

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confidence: 99%

mentioning

confidence: 99%

Nanocellulose, a Versatile Green Platform: From Biosources to Materials and Their Applications

Thomas¹,

Raj²,

B³

et al. 2018

Chem. Rev.

1,271

752

View full text Add to dashboard Cite

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“…The Stokes-Einstein equation is applied for non-interacting spherically shaped particles. (Božič et al 2015) Attenuated total reflectance fourier transform infrared spectroscopy (ATR-FTIR) measurements…”

Section: Dynamic Light Scattering (Dls) and Zeta Potentialmentioning

confidence: 99%

Effect of different surface active polysaccharide derivatives on the formation of ethyl cellulose particles by the emulsion-solvent evaporation method

et al. 2018

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This paper aims at a better understanding of the systematic production of the ethyl cellulose (EC) particles by using an emulsification-solvent evaporation method in the presence of different polysaccharide derivatives. In particular, the role of different surface active polymers i.e. one ioniccarboxymethyl cellulose, one nonionic-hydroxyethyl cellulose, and two amphiphilic-high molecular weight methyl cellulose and low molecular weight methyl cellulose on EC particle formation was investigated. We have established how individual surface active polysaccharides with varying concentration from 0.1 to 3.0 wt% affect particle size and its distribution, particle shape, surface charge, and particle surface morphology. The interdependencies between surfactant nature and concentration at constant processing parameters and the subsequent nanoto micro-particle characteristics are discussed. It was determined that the particle size, surface morphology, supramolecular structure and surface properties of EC particles, prepared by an emulsion evaporation method can be effectively controlled by the type and concentration of used polysaccharide surfactant yielding spherical particles sizes from 170 nm to the micrometer level with smooth particle surfaces or remarkably a wrinkled surface morphology or ''particle on particle'' structures.

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“…Cellulose esters (CEs), from which cellulose acetate (CA) is the more popular, are of great importance because of their abilities for selective absorption and removal of organic compounds or their compatibilities with plastics as a reinforcing material [117]. Božič et al studied the acetylation efficiency of nanofibrillated cellulose (NFC) with acetic anhydride as acetyl donor using lipase from A. niger in a mixture of dimethyl sulfoxide (DMSO) and phosphate buffer solution at ambient conditions and in supercritical carbon dioxide (scCO 2 ) [117].…”

Section: Chemical Industrymentioning

confidence: 99%

Aspergillus Lipases: Biotechnological and Industrial Application

Contesini¹,

Calzado²,

Madeira³

et al. 2016

Fungal Metabolites

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Lipases are enzymes with remarkable properties and catalytic versatility. These proteins are capable of catalyzing hydrolytic and synthetic reactions, allowing the production of different compounds. Aspergillus are important producers of lipases, since they are able to secrete large amounts of these proteins to the extracellular media. Several studies have reported the importance of fermentation parameters as well as genetic engineering of Aspergillus strains in order to improve lipase production. Different Aspergillus species secrete lipases with interesting characteristics such as thermostability, stability in a wide pH range, stability in organic solvents, and enantioselectivity toward the substrate. The obtainment of lipases with highlighted characteristics for use in industry is the main focus of several studies. Such lipases can be obtained with screening of Aspergillus strains, protein engineering, and immobilization of lipases that can frequently improve thermostability and enantioselectivity. Among the applications of lipases from Aspergillus, there are studies on the improvement of sensorial properties of different products in the food industry, compatibility with detergents for removal of fat stains from fabrics, and the obtainment of enantiopure pharmaceuticals.

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New findings about the lipase acetylation of nanofibrillated cellulose using acetic anhydride as acyl donor

Cited by 47 publications

References 31 publications

Nanocellulose, a Versatile Green Platform: From Biosources to Materials and Their Applications

Nanocellulose, a Versatile Green Platform: From Biosources to Materials and Their Applications

Effect of different surface active polysaccharide derivatives on the formation of ethyl cellulose particles by the emulsion-solvent evaporation method

Aspergillus Lipases: Biotechnological and Industrial Application

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