Cellulose Nanocrystals From Bacterial Cellulose

Lima, Lais R.; Santos, Daniele B.; Santos, Molíria V.; Barud, Hernane S.; Henrique, Mariana Alves; Pasquini, Daniel; Pécoraro, Édison; Ribeiro, Sidney J. L.

doi:10.5935/0100-4042.20150131

Cited by 9 publications

(6 citation statements)

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“…The X-ray diffractograms with Rietveld refinement of the pristine and GPTMS- and APTS-functionalized BCNC films (Figure ) evidence a pattern that is typical of type-I cellulose, with the peaks at 14.6°, 16.7°, and 22.7° being assigned, respectively, to the (10), (110), and (200) planes. This pattern is characteristic of the I β (monoclinic) allomorph of cellulose, confirmed by Rietveld refinement, allomorph which prevails in BC. ,, From the Rietveld refinement, it was possible to obtain the lattice parameters, the crystallite size, and the crystallinity index of the films. Those values are shown in Table , together with the weighted profile ( R wp ) and goodness of fit (GOF) criteria of fit.…”

Section: Resultsmentioning

confidence: 57%

Fabrication of Noncytotoxic Functional Siloxane-Coated Bacterial Cellulose Nanocrystals

Lima

Conte

Brandão

et al. 2022

ACS Appl. Polym. Mater.

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Bacterial cellulose nanocrystals (BCNC) stand out as versatile biocolloidal building blocks for materials that are highperformance, owing to their inherently high crystallinity and specific modulus and surface area, and sustainable, as BCNC are both biobased and biodegradable. BCNC materials are also promising for their multifunctionality because of their huge potential to undergo physical and/or chemical surface modification. This is particularly appealing for biomedical applications thanks to the biocompatibility, high purity, and low toxicity of BCNC. We report on films based on surface-modified BCNC with varying contents of 3-glycidyloxypropyltrimethoxysilane (GPTMS) or 3-aminopropyltriethoxysilane (APTS). Importantly, these highly pure and crystalline needle-shaped BCNC were isolated from scraps generated at industrial operations when shaping bacterial cellulose membranes into wound dressings. The films were extensively characterized as far as their structural characteristics, with emphasis on the major features targeting at biological applications. Compared with pristine BCNC, the films performed better from the thermal stability standpoint and maintained the noncytotoxicity against nontransforming fibroblasts. The latter claim was independent of GPTMS content, but dose-dependent for APTS and valid for films containing up to 30% of this coupling agent. Altogether, this contribution expands the wingspan of nanocellulose-based materials in biomedical applications while mitigating the waste of natural resources by upcycling an industrial byproduct, falling within the circular bioeconomy framework.

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Section: Resultsmentioning

confidence: 57%

Fabrication of Noncytotoxic Functional Siloxane-Coated Bacterial Cellulose Nanocrystals

Lima

Conte

Brandão

et al. 2022

ACS Appl. Polym. Mater.

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“…14.6, 16.9, and 22.7°a re assigned, respectively, to the ( 10), (110), and (200) planes that are characteristic of the Iα (triclinic) allomorph, which in turn prevails in BC. 19,27 All-Cellulose Composite Films. The isolated BCNCs were added at different contents to HPMC film-forming formulations and solvent cast into all-cellulose composite films, all of which were macroscopically continuous (i.e., devoid of macroscopic flaws), homogeneous (i.e., lacking poorly dispersed domains and texture/colors gradients), and pliable (i.e., flexible enough to manipulate and peel off from the casting surface without impaired integrity).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Specifically, the three sharp peaks at ca. 14.6, 16.9, and 22.7° are assigned, respectively, to the (10), (110), and (200) planes that are characteristic of the Iα (triclinic) allomorph, which in turn prevails in BC. , …”

Section: Resultsmentioning

confidence: 99%

“…BCNCs were isolated from the BC scraps via sulfuric acid hydrolysis, as described elsewhere. 19 Briefly, the scraps were milled into powder and allowed to react with a 64 vol % sulfuric acid solution in water (17.5 mL of solution per g of powder) under mechanical stirring at 500 rpm and 50 °C for 50 min. The BCNC suspension was washed with ice-cold water (1:10 volume ratio) and centrifuged at 6000 rpm for 10 min to remove excess sulfuric acid.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Upcycling Microbial Cellulose Scraps into Nanowhiskers with Engineered Performance as Fillers in All-Cellulose Composites

Melo

Otoni

Barud

et al. 2020

ACS Appl. Mater. Interfaces

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Cellulose is everywhere and renovates in nature continuously and rapidly, while petroleum does not. Unlike the latter, cellulose biodegrades and may represent a carbon sink. Inspired by the multiscale architecture of cellulose, we report on all-cellulose composites comprising cellulose ether as a matrix and highly pure bacterial cellulose nanocrystals (BCNCs) as fillers. Optimum performance as a packaging material was achieved by engineering BCNC surface chemistry as well as the filler-in-matrix dispersion, targeting the replacement of unsustainable, fossil-derived plastics intended for single-use applications. Cost could pose a hurdle, eliminated through the valorization of underutilized scraps from industrial operations, which is also in line with the circular bioeconomy in terms of the integral use of biomass. As far as performance, the optically transparent hydroxypropyl methylcellulose (HPMC) films presented improved tensile strength (from 61 ± 6 to 86 ± 9 MPa) and Young's modulus (from 1.5 ± 0.2 to 2.7 ± 0.4 GPa) while reduced elongation at break (from 15 ± 2 to 12 ± 2%) and water vapor permeability (from 0.40 ± 0.02 to 0.31 ± 0.01 g mm h −1 m −2 kPa −1 ) when filled with only 5 wt % of (120 ± 31) nm long, (13 ± 3) nm wide, 88% crystalline BCNC. This dual, win−win effect of BCNCs on the mechanical and barrier properties of HPMC films was enabled by a suitable dispersion state, achieved via high-energy mixing, and quenched by casting. This study adds to the current literature on all-cellulose composites and helps pave the route for the technical and economical feasibilities of replacing non-renewable, non-biodegradable plastics in short-term applications by materials that are both renewable and biodegradable, that are also produced through green protocols and isolated from surplus biomass, and that still perform similarly or even better.

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“…Não há estudo de avaliação do SCOBY quanto à composição química. Segundo Lima et al (2015) fibras naturais, apesar de ser a principal fonte de celulose devido a sua abundância natural, ao serem utilizados com fonte para a extração de nanocristais, requerem um pré-tratamento de purificação para retirada de lignina e hemicelulose e esse processo é poluente e de alto custo. Neste caso a celulose bacteriana surge como excelente alternativa, pois como citado é livre de impurezas, além de ser altamente cristalina e obtida em escalas comerciais.…”

Section: Resultsunclassified

CARACTERIZAçãO DE SCOBY DO KOMBUCHA PARA a PRODUçãO DE BIOFILMES

Domeneghetti¹,

Schmidt²,

Soares³

2019

Blucher Chemical Engineering Proceedings

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RESUMO-O meio ambiente vem sofrendo muito com os materiais poliméricos descartados no solo, pois demoram para se degradarem além de ter a capacidade de produzir resíduos muito tóxicos a terra. Uma solução para o problema ambiental dos plásticos pode ser o SCOBY (Symbiotic Culture of Bacteria and Yeasts). Desta maneira, o objetivo do trabalho foi caracterizar o SCOBY, identificando seu potencial celulósico, assim como, analisar se será possível utilizar esse material para produzir filmes biodegradáveis. Para isso, foi preciso preparar o chá kombucha e adicionar uma colônia de SCOBY para fermentação e posteriormente secagem. Em seguida, foi realizado testes para identificar os teores de lignina klason insolúvel, celulose, holocelulose, hemicelulose e α-celulose que existe no material. Os resultados observados foram 4,09% de α-celulose, 8,96% de holocelulose, 4,89% de hemicelulose, 9,55% de lignina klason insolúvel e 0,0083% de lignina klason solúvel. Pelo teor de celulose e holocelulose apresentado, conclui-se que o SCOBY pode ser utilizado para elaborar filmes biodegradáveis e substituir os materiais poliméricos.

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Cellulose Nanocrystals From Bacterial Cellulose

Cited by 9 publications

References 0 publications

Fabrication of Noncytotoxic Functional Siloxane-Coated Bacterial Cellulose Nanocrystals

Fabrication of Noncytotoxic Functional Siloxane-Coated Bacterial Cellulose Nanocrystals

Upcycling Microbial Cellulose Scraps into Nanowhiskers with Engineered Performance as Fillers in All-Cellulose Composites

CARACTERIZAçãO DE SCOBY DO KOMBUCHA PARA a PRODUçãO DE BIOFILMES

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