Sulfur contaminations inhibit depolymerization of Kraft lignin

Daniel, D. Jafrey; Khachatryan, Lavrent; Astete, Carlos E.; Asatryan, Rubik; Mărculescu, Cosmin; Boldor, Dorin

doi:10.1016/j.biteb.2019.100341

Cited by 16 publications

(16 citation statements)

References 44 publications

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“…The squat is a task with naturally higher ROM, and its joint ranges are not necessarily associated with larger ground reaction forces (that would likely reflect joint reaction loading). Therefore although previous studies on gait 32,38 reported a decrease in HCF had been linked with decreased bone mineral joint density 57 or improved T1rho signal associated with better cartilage health 6,37 , the higher muscle forces and HCF in the present study can be the initial evidence of postoperative joint health restoration and alleviated symptoms. In this line, finite element analysis would be able to translate HCF to shear stresses providing a clearer picture of the pathomechanism.…”

Section: Discussionmentioning

confidence: 49%

“…Besides, neuromuscular adaptations have been reported to influence symptoms and contribute to changes in biomechanical outcomes 19,[29][30][31][32] . Although several studies reported on hip biomechanics in patients from pre-arthritic hip disease 20,27,[33][34][35][36][37] , the effect on musculoskeletal loading in terms of the dynamic muscle forces and hip contact force (HCF) is still limited to gait 32,37,38 with little information during functional ROM. As osteochondroplasty of the cam morphology can decrease joint contact loading by 21-27% 39,40 , a further understanding of changes in muscle forces and their consequent effect on joint loading may provide benefits to design better pre-and/or postoperative FAI rehabilitation programs after corrective FAI surgery 41,42 .…”

Section: Introductionmentioning

confidence: 99%

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Hip Muscle Forces and Contact Loading During Squatting After Cam-Type FAI Surgery

Catelli

Wesseling

et al. 2020

Journal of Bone and Joint Surgery

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Background: Corrective hip surgery for cam-type femoroacetabular impingement (FAI) aims to improve hip function and prevent joint degeneration. The purpose was to compare muscle and hip contact forces (HCF) during squatting in cam-FAI patients before and after hip corrective surgery, and in healthy control participants (CTRL).Methods: Ten symptomatic cam-FAI male patients performed deep squatting pre-and at 2 years postoperatively. Patients were age, and body-mass-index matched to 10 CTRL male participants. Full-body kinematics and kinetics were computed and, muscle forces and HCF were estimated using musculoskeletal model and static optimization. Normalized squat cycle (%SC) trials were compared using statistical non-parametric mapping (SnPM). Results: Postoperative patients squatted down with higher anterior pelvic tilt (11-29%SC, P=.004), higher hip flexion (9-31%SC, P=.003) and greater hip extension moments (21-26%SC, P=.008) compared to preoperative FAI. Preoperative patients also demonstrated lower anterior pelvic tilt (7-9%SC, P=.023; 92-99%SC, P=.016) and lower hip flexion (87-97%SC, P=.008) compared to the CTRL. Postoperative patients showed increased semimembranosus force concerning their preoperative values (68-73%SC, P=.002). Preoperative forces were also lower than the CTRL for the adductor magnus (28-34%SC, P=.011), psoas major (49-58%SC, P=.

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Section: Discussionmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 99%

Hip Muscle Forces and Contact Loading During Squatting After Cam-Type FAI Surgery

Catelli

Wesseling

et al. 2020

Journal of Bone and Joint Surgery

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“…For example, a report showed that S 8 extracted from pulp and paper mills was acutely toxic to luminescent bacteria in the Microtox test, as well as to zebrafish and perch larvae . Daniel et al also revealed that a sulfur contaminant would decrease the bio-oil yield, the production distribution, and increase the char content during the pyrolysis process of KL . The highly hydrophobic S 8 could dissolve reasonably well in nonpolar solvents like aliphatic ethers due to its zero hydrogen bond acidity and zero hydrogen bond basicity. , MTBE used in this study was an effective aliphatic ether being capable of removing nonlignin substances as well as elemental sulfur.…”

Section: Resultsmentioning

confidence: 95%

Fractionation of Lignin with Decreased Heterogeneity: Based on a Detailed Characteristics Study of Sequentially Extracted Softwood Kraft Lignin

Smeds

Wang

et al. 2021

ACS Sustainable Chem. Eng.

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Industrial lignin fractionation is attracting increasing interest due to its enormous potential in the development of high value-added materials. However, the widely reported fractionation approaches are primarily focused on the separation of fractions with a low polydispersity index (PDI). In this study, based on the detailed characteristic examination of carefully sequential-extracted softwood Kraft lignin fractions, a novel method to isolate lignin fraction with decreased heterogeneity (LGF-dh), was established in consideration of impurities, elemental composition, molar mass distribution, carbohydrate content, functional hydroxyl content, and the content of ligninrelevant aromatic units. To characterize the mentioned properties, an elemental analyzer, SEC-MALS, GC−MS, GC-FID, Py/GC− MS, 31 P-NMR, and HSQC-NMR were used to compare the differences of the sequential lignin fractions that were obtained by methyl tert-butyl ether (MTBE), ethyl acetate (EtOAc), ethanol (EtOH), methanol (MeOH), acetone, and dioxane. Moreover, a practical and feasible three-step extraction process was proposed to separate the low heterogeneity lignin fraction from industrial lignin according to the different solubilities of each fraction in the green cosolvent system of EtOH/water, MeOH/water, and acetone/water. Overall, this work presented a comprehensive study on the properties of softwood lignin as well as proposed a feasible and convenient method to reduce the heterogeneity of lignin, which would promote its valorization.

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“…The quantitatively most frequent representative of the bound sulfur in Indulin AT is dimethyl-disulfide. This may inhibit the depolymerization of kraft lignin (Daniel et al, 2019). Demethylation of kraft lignin is recommended for activation (Bourbonnais and Paice, 1992;Hu et al, 2011;Venkatesagowda, 2019).…”

Section: Oxygen Consumption Measurementsmentioning

confidence: 99%

Enzymatic Oxidation of Ca-Lignosulfonate and Kraft Lignin in Different Lignin-Laccase-Mediator-Systems and MDF Production

Euring

Ostendorf

Rühl

et al. 2022

Front. Bioeng. Biotechnol.

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Laccase-mediator-oxidized lignin offers replacement for conventional chemical binders to produce fiberboards. Compared to the previously reported laccase–mediator system (LMS), a lignin-laccase-mediator-system (LLMS) has an advantage in that it requires much shorter fiber-enzyme incubation time due to significantly increased redox reactions. However, the cost of regularly applying laccase on an industrial scale is currently too high. We have employed CcLcc5 from cultures of the basidiomycete Coprinopsis cinerea as a novel basi-laccase (a CAZy subfamily AA1_1 laccase) in medium-density fiberboard (MDF) production, in comparison to the commercial formulation Novozym 51003 with recombinantly produced asco-laccase MtL (a CAZy subfamily AA1_3 laccase-like multicopper oxidase from the ascomycete Myceliophthora thermophila). With the best-performing natural mediator 2,6-dimethoxyphenol (DMP), unpurified CcLcc5 was almost as good as formulated Novozym 51003 in increasing the molecular weight (MW) of the technical lignins tested, the hydrophilic high-MW Ca-lignosulfonate and the hydrophobic low-MW kraft lignin (Indulin AT). Oxygen consumption rates of the two distantly related, poorly conserved enzymes (31% sequence identity) with different mediators and lignosulfonate were also comparable, but Indulin AT significantly reduced the oxidative activity of Novozym 51003 unlike CcLcc5, regardless of the mediator used, either DMP or guaiacol. Oxygen uptake by both laccases was much faster with both technical lignins with DMP than with guaiacol. In case of lignosulfonate and DMP, 20–30 min of incubation was sufficient for full oxygen consumption, which fits in well in time with the usual binder application steps in industrial MDF production processes. LLMS-bonded MDF was thus produced on a pilot-plant scale with either crude CcLcc5 or Novozym 51003 at reduced enzyme levels of 5 kU/kg absolutely dry wood fiber with lignosulfonate and mediator DMP. Boards produced with CcLcc5 were comparably good as those made with Novozym 51003. Boards reached nearly standard specifications in internal bond strength (IB) and modulus of rupture (MOR), while thickness swelling (TS) was less good based on the hydrophilic character of lignosulfonate. LLMS-bonded MDF with Indulin AT and DMP performed better in TS but showed reduced IB and MOR values.

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Sulfur contaminations inhibit depolymerization of Kraft lignin

Cited by 16 publications

References 44 publications

Hip Muscle Forces and Contact Loading During Squatting After Cam-Type FAI Surgery

Hip Muscle Forces and Contact Loading During Squatting After Cam-Type FAI Surgery

Fractionation of Lignin with Decreased Heterogeneity: Based on a Detailed Characteristics Study of Sequentially Extracted Softwood Kraft Lignin

Enzymatic Oxidation of Ca-Lignosulfonate and Kraft Lignin in Different Lignin-Laccase-Mediator-Systems and MDF Production

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