Methylene blue adsorption onto hydrogels made from different Eucalyptus dissolving pulps

Carrillo-Varela, Isabel; Mendonça, Regis Teixeira; Pereira, Miguel; Reyes-Contreras, Pablo; Contreras, David

doi:10.1007/s10570-021-04301-y

Cited by 10 publications

(4 citation statements)

References 100 publications

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“…CCE17.5 and CCE35 presented a carboxyl content of 0.038 and 0.047 mmol/g, respectively ( Figure 7 ). On the other hand, the shorter cellulose chains of CCE17.5 and CCE35 samples also contributed to increase the access to the internal structure of fibers allowing the diffusion of ions involved in the conductimetric titration [ 38 ]. The amount of carboxyl groups in pine (from 0.032 to 0.021 mmol/g) was significantly lower than eucalyptus.…”

Section: Resultsmentioning

confidence: 99%

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Alkalization of Kraft Pulps from Pine and Eucalyptus and Its Effect on Enzymatic Saccharification and Viscosity Control of Cellulose

Carrillo-Varela¹,

Vidal

Vidaurre

et al. 2022

Polymers

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Bleached kraft pulps from eucalyptus and pine were subjected to cold caustic extraction (CCE) with NaOH (5, 10, 17.5, and 35%) for hemicelluloses removal and to increase cellulose accessibility. The effect of these changes was evaluated in enzymatic saccharification with the multicomponent Cellic CTec3 enzyme cocktail, and in viscosity reduction of pulps with the monocomponent Trichoderma reesei endoglucanase (EG). After CCE with 10% NaOH (CCE10) and 17.5% NaOH (CCE17.5), hemicellulose content lower than 1% was achieved in eucalyptus and pine pulps, respectively. At these concentrations, cellulose I started to be converted into cellulose II. NaOH concentrations higher than 17.5% decreased the intrinsic viscosity (from 730 to 420 mL/g in eucalyptus and from 510 to 410 mL/g in pine). Cellulose crystallinity was reduced from 60% to 44% in eucalyptus and from 71% to 44% in pine, as the NaOH concentration increased. Enzymatic multicomponent saccharification showed higher glucose yields in all CCE-treated eucalyptus samples (up to 93%) while only CCE17.5 and CCE35 pine pulps achieved 90% after 40 h of incubation. Untreated bleached pulps of both species presented saccharification yields lower than 70%. When monocomponent EG was used to treat the same pulps, depending on enzyme charge and incubation time, a wide range of intrinsic viscosity reduction was obtained (up to 74%). Results showed that eucalyptus pulps are more accessible and easier to hydrolyze by enzymes than pine pulps and that the conversion of cellulose I to cellulose II hydrate only has the effect of increasing saccharification of CCE pine samples. Viscosity reduction of CCE pulps and EG treated pulps were obtained in a wide range indicating that pulps presented characteristics suitable for cellulose derivatives production.

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Section: Resultsmentioning

confidence: 99%

“…Curve fitting was performed using PeakFit software (Systat, Software Inc., San Jose, CA, USA) to identify individual peaks. The detailed deconvolution procedure can be found in Carrillo-Varela et al [ 38 ]. In all cases, the F number was >45,000 (R 2 < 0.997).…”

Section: Methodsmentioning

confidence: 99%

Alkalization of Kraft Pulps from Pine and Eucalyptus and Its Effect on Enzymatic Saccharification and Viscosity Control of Cellulose

Carrillo-Varela¹,

Vidal

Vidaurre

et al. 2022

Polymers

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“…Fourier transform infrared (FT-IR) spectra of the KL, SMPs, and KL–SMPs fabricated at −20 °C were recorded in the range of 4000–400 cm –1 on a PerkinElmer spectrophotometer with a KBr standard. The crystal phase of the KL, SMPs, and KL–SMPs was analyzed using X-ray diffraction (XRD; D8 Advance X-ray diffractometer, Bruker, Germany) from 3 to 60° (2θ) using Cu Kα radiation (1.54 Å); the percentage of crystallinity of KL–SMPs was estimated from the resulting spectra by calculating the ratio between the area of the peaks and the total area . All samples were dried in a vacuum dryer overnight before the measurement.…”

Section: Methodsmentioning

confidence: 99%

“…The crystal phase of the KL, SMPs, and KL−SMPs was analyzed using X-ray diffraction (XRD; D8 Advance X-ray diffractometer, Bruker, Germany) from 3 to 60°(2θ) using Cu Kα radiation (1.54 Å); the percentage of crystallinity of KL−SMPs was estimated from the resulting spectra by calculating the ratio between the area of the peaks and the total area. 25 All samples were dried in a vacuum dryer overnight before the measurement. The ultraviolet− visible (UV−vis) optical absorption spectra and diffuse reflectance spectra of the SMPs and KL−SMPs were analyzed in the 200−800 nm range using an Agilent Cary 7000 UV−vis spectrophotometer.…”

Section: Fabrication Of Kl-embedded Starch Microparticles (Kl− Smps)mentioning

confidence: 99%

Self-Assembly of Light-Colored UV-Absorbing Lignin–Starch Microcapsules

You

Choi

Kim

et al. 2023

ACS Sustainable Chem. Eng.

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The aromatic polymer kraft lignin (KL) is an effective UV absorber that has recently emerged as a promising natural candidate for UV radiation filters in cosmetics. However, despite the excellent UV-blocking performance of KL, its dark color owing to chromophores and low solubility in aqueous environments are significant bottlenecks to its use in practical UV-shielding applications. Herein, the intrinsic problems associated with the color and dispersity of KL were resolved by fabricating a composite matrix of KL with short-chain glucan (SCG), which was obtained from the enzymatic cleavage of amylopectin in waxy maize starch, to employ its white color and hydrophilic nature; the composite matrix was fabricated via self-assembly into spherical microcapsules without the need for any toxic solvent or chemical modifications. We utilized the characteristics of the intermolecular interactions between KL and SCG which enabled their solubility in the aqueous γ-valerolactone/double-distilled water binary solvent. Notably, the J-aggregation state of KL allows for the even distribution of KL within the composite, significantly improving the UV-blocking properties with a broad absorption range and a UVA/UVB ratio of 0.9 at the critical wavelength (λ c ) of 387 nm, which are sufficient for practical use as a UV-blocking filter.

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Tailoring cellulose-based hydrogels by phosphorylation of unbleached kraft pulps for adsorption applications

Carrillo-Varela,

Albornoz,

Reyes-González

et al. 2024

Cellulose

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Methylene blue adsorption onto hydrogels made from different Eucalyptus dissolving pulps

Cited by 10 publications

References 100 publications

Alkalization of Kraft Pulps from Pine and Eucalyptus and Its Effect on Enzymatic Saccharification and Viscosity Control of Cellulose

Alkalization of Kraft Pulps from Pine and Eucalyptus and Its Effect on Enzymatic Saccharification and Viscosity Control of Cellulose

Self-Assembly of Light-Colored UV-Absorbing Lignin–Starch Microcapsules

Tailoring cellulose-based hydrogels by phosphorylation of unbleached kraft pulps for adsorption applications

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