Ultrasound‐assisted swelling of bacterial cellulose

Song, Ji Eun; Su, Jing; Loureiro, Ana; Martins, Madalena; Cavaco-Paulo, Artur; Kim, Hye Rim; Silva, Carla

doi:10.1002/elsc.201700085

Cited by 26 publications

(22 citation statements)

References 70 publications

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“…In a previous study we have evaluated the best conditions for the immobilization of laccase onto bacterial cellulose membranes (Song et al 2017 ). Considering the best operational immobilization conditions, the goal herein was to immobilize native laccase onto bacterial cellulose membranes maintaining its catalytic activity for posterior catalysis.…”

Section: Discussionmentioning

confidence: 99%

“…It is noteworthy after visual evaluation of colored samples, the great potentiality of the bacterial cellulose membranes to be bio-colorized. Their high porosity allows that a higher amount of polymer remain inside the material in contrast to other materials like cotton, to which the new polymers do not have significant affinity (Calafell et al 2007 ; Song et al 2017 ). The color strength, visually evaluated (Table 3 ), corroborates the MALDI-TOF results obtained.…”

Section: Discussionmentioning

confidence: 99%

“…For further studies of immobilization, BC samples were swelled with 8% of NaOH solution in a liquor ratio of 1:10 (v/w) for 30 min under ultrasounds. The ultrasonication was conducted in a sonicator bath at a fixed frequency 45 kHz and power intensity at 120 W. Afterward, the BC samples were dried for 2 h at 50 °C (Song et al 2017 ).…”

Section: Methodsmentioning

confidence: 99%

“…We have previously optimized the swelling of bacterial cellulose membranes obtained from Scooby, in order to achieve the highest level of molecules entrapment and enzyme immobilization. The highly porous material showed potentialities for the in situ phenolics polymerization (Song et al 2017 ).…”

Section: Introductionmentioning

confidence: 99%

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Bio-coloration of bacterial cellulose assisted by immobilized laccase

Song

Noro

et al. 2018

AMB Expr

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In this work a process for the bio-coloration of bacterial cellulose (BC) membranes was developed. Laccase from Myceliophthora thermophila was immobilized onto BC membranes and retained up to 88% of residual activity after immobilization. Four compounds belonging to the flavonoids family were chosen to test the in situ polymerase activity of immobilized laccase. All the flavonoids were successfully polymerized by laccase giving rise to yellow, orange and dark brown oligomers which conferred color to the BC support. The optimal bio-coloration conditions were studied for two of the tested flavonoids, catechol and catechin, by varying the concentration and time of incubation. High color depth and resistance to washing were obtained for both compounds. The highly porous bacterial cellulose material demonstrated great performance as a bio-coloration support, in contrast to other materials cited in literature, like cotton or wool. The process developed is presented as an environmentally friendly alternative for bacterial cellulose bio-coloration and will contribute deeply for the development of new fashionable products within this material.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bio-coloration of bacterial cellulose assisted by immobilized laccase

Song

Noro

et al. 2018

AMB Expr

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“…Afterward the samples were subjected to ultrasonication, using an ultrasonic bath, at 50 • C for 5 min. The BC was neutralized with 0.5% acetic acid (v/v) (Song et al, 2017).…”

Section: Entrapment Of Carboxymethyl Cellulose Inside Bcmentioning

confidence: 99%

Carboxymethyl Cellulose (CMC) as a Template for Laccase-Assisted Oxidation of Aniline

Shim

Noro

Cavaco‐Paulo

et al. 2020

Front. Bioeng. Biotechnol.

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Polyaniline (PANi) is a conducting polymer which has been subject of intensive research on the exploitation of new products and applications. The main aim of the work is the development of a conductive bacterial cellulose (BC)-based material by enzymaticassisted polymerization of aniline. For this, we study the role of carboxymethyl cellulose (CMC) as a template for the in situ polymerization of aniline. Bacterial cellulose was used as the supporting material for the entrapment of CMC and for the in situ oxidation reactions. The amount of CMC entrapped inside BC was optimized as well as the conditions for laccase-assisted oxidation of aniline. The new oligomers were evaluated by spectrometric techniques, namely 1 H NMR and MALDI-TOF, and the functionalized BC surfaces were analyzed by thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), and reflectance spectrophotometry. The conductivity of the developed materials was evaluated using the four-probe methodology. The oligomers obtained after reaction in the presence of CMC as template display a similar structure as when the reaction is conducted only in BC. Though, after oxidation in the presence of this template, the amount of oligomers entrapped inside BC/CMC is considerably higher conferring to the material greater electrical conductivity and coloration. The use of CMC as a template for aniline oxidation on BC seems to be a promising and cheap strategy to improve the yield of functionalization and increment the properties of the materials, namely electrical conductivity and coloration.

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Comparative study on the physical entrapment of soy and mushroom proteins on the durability of bacterial cellulose bio‐leather

Kim

Song

2021

Cellulose

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This study aimed to develop eco-friendly bacterial cellulose (BC) bio-leather with improved durability using plant-based proteins, namely soy protein isolate (SPI) and mushroom protein (MP), which were physically entrapped inside the BC, respectively. The amounts of the plant-based proteins were determined by evaluating the tensile strength of BC bio-leather, and were found to be 20 wt% and 50 wt% of BC for SPI and MP, respectively. The enhanced properties of mechanical strength and durability of BC bio-leather were measured in terms of changes in water resistance, tensile strength, flexibility, crease recovery, and dimensional stability. The durability of BC was improved after the entrapment of proteins, and moreover, the durability of BC entrapped with plant-based proteins was further improved by the addition of glycerol. Especially, BC entrapped with MP and glycerol had better water resistance, tensile strength, flexibility, and crease recovery compared to cowhide leather. The chemical and physical structures of BC bio-leathers were studied using Fourier transform-infrared spectroscopy, X-ray diffraction, field-emission scanning electron microscopy, and energy dispersive X-ray spectroscopy analyses. From the results, it was confirmed that BC entrapped with MP and glycerol could be a suitable leather substitute.

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Ultrasound‐assisted swelling of bacterial cellulose

Cited by 26 publications

References 70 publications

Bio-coloration of bacterial cellulose assisted by immobilized laccase

Bio-coloration of bacterial cellulose assisted by immobilized laccase

Carboxymethyl Cellulose (CMC) as a Template for Laccase-Assisted Oxidation of Aniline

Comparative study on the physical entrapment of soy and mushroom proteins on the durability of bacterial cellulose bio‐leather

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