Recovery of phenols from autohydrolysis liquors of barley husks: Kinetic and equilibrium studies

Conde, Enma; Moure, Andrés; Domı́nguez, Herminia

doi:10.1016/j.indcrop.2017.03.048

Cited by 16 publications

(6 citation statements)

References 43 publications

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“…In general, the resin adsorption can be controlled by either the liquid film diffusion or intraparticle diffusion [ 15 ]. In Weber&Morris diffusion model, it is assumed that lignin adsorption occurs in three process: (1) the migration of lignin from RBL to the surface of the adsorbent, (2) the diffusion of lignin from the outer surface to the inner pores of the adsorbent, (3) the attachment of lignin to the active sites on the pore surface of the particle by chemical reaction [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

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Adsorption Study of Lignin Removal from Recycled Alkali Black Liquor by Adsorption Resins for Improved Cellulase Hydrolysis of Corn Straw

Fang

Zhou

et al. 2020

Molecules

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Previous studies showed that aromatic compounds such as lignin, phenols, and furans were main inhibitors of cellulase hydrolysis in recycled alkali black liquor (RBL), which should be removed to improve alkali utilization. In this study, three polymeric resins, XAD-4, XAD-16N, and XAD-7HP, were evaluated for their abilities to remove lignin from alkali black liquor recycled at the third time. Adsorption conditions of adsorbent dose and equilibrium time, isotherms, and kinetics were investigated. Of three tested adsorbents, XAD-16N was the most efficient, which can remove 89.84% of lignin after adsorption at an adsorbent-to-solution ratio of 1:4 for 2.5 h. Pseudo-second-order model was efficient to represent XAD-16N and XAD-7HP adsorption kinetics. Adsorption behavior of XAD-4 on RBL was fitted better to Langmuir model, while XAD-16N and XAD-7HP adsorption were more consistent with Freundlich model. The cellulase hydrolysis rate of corn straw treated with RBL after XAD-16N adsorption combined with ozone was 86.89%, which was only 0.89% lower than that of sodium hydroxide combined with ozone treatment. Structure characterization proved that the damage of XAD-16N adsorbed RBL to corn straw was similar to that of sodium hydroxide. It indicated that adsorption was effective in inhibitor removal from RBL to improve alkali utilization.

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Section: Resultsmentioning

confidence: 99%

“…The third stage was the lignin adsorption saturation tends to equilibrium. The fitting linear failed to pass the origin, which indicated that intraparticle diffusion was not the only rate-controlling step during the entire adsorption process [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Adsorption Study of Lignin Removal from Recycled Alkali Black Liquor by Adsorption Resins for Improved Cellulase Hydrolysis of Corn Straw

Fang

Zhou

et al. 2020

Molecules

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“…Phenolic compounds in the basal medium were biosynthesized by the submerged fermentation fungus itself 2 . Phenolic compounds in the WS‐containing medium probably included those in the basal medium, products of lignin decomposition, 10,29,30 and newly synthesized compounds from mediators as which lignin decomposition products served under oxidative stress during lignocellulose biodegradation 6 . Tr‐100 caused more efficient lignocelllulose degradation, and then probably further enhanced the effect of WS biodegradation (Fig.…”

Section: Resultsmentioning

confidence: 99%

Production of phenolic compounds and antioxidant activity via bioconversion of wheat straw by Inonotus obliquus under submerged fermentation with the aid of a surfactant

et al. 2020

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BACKGROUNDThis study investigated the effect of surfactants on wheat straw biodegradation and the growth‐associated generation of exo‐ and endo‐phenolic compounds (EPC and IPC) and antioxidant activity expression by liquid‐cultured Inonotus obliquus, an edible and medicinal mushroom, also known as a white rot fungus. Changes in the chemical composition and multiscale structure of wheat straw, in the production and activity of EPC and IPC and in individual flavonoids were analyzed.RESULTSFungal pretreatment decreased significantly the contents of all lignocellulose components, increased and enlarged substrate porosity and caused changes in the structure of wheat straw with the aid of Triton X‐100. A gradual increase in EPC and IPC production was observed up to 6.4‐ and 1.5‐fold for 9 days. The EPC obtained on day 9 showed the highest antioxidant activity (IC50 of 30.96 mg L−1) against 2,2‐diphenyl‐1‐picrylhydrazyl radicals. High‐performance liquid chromatographic results indicated the presence of high amounts of epicatechin‐3‐gallate (ECG; (374.9 mg g−1) and epigallocatechin‐3‐gallate (EGCG; 447.2 mg g−1) in the EPC; other polyphenols were also enhanced but to a lesser extent. Surfactant supplementation was effective in enhancing flavonoid production and in increasing antioxidant activity in EPC.CONCLUSIONSThe results indicated enhanced accumulation of phenolic compounds, particularly ECG and EGCG in Inonotus obliquus via biodegradation and bioconversion of lignocellulose residues. They also indicated enhancement in the production of several flavonoids and also an increase in antioxidant activity in the product by a surfactant‐treated process, which may be a useful way of exploiting underused lignocellulosic residues to various high‐added‐value functional ingredients. © 2020 Society of Chemical Industry

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“…Note here that autohydrolysis liquors for natural and blanched broccoli were labelled as AHN and AHB, followed by the corresponding final operation temperature. Dry content and extraction yield of the liquid phase were determined as reported elsewhere (Conde et al ., ). Briefly, in order to achieve the dry content, a representative liquor sample (5 g) were placed in a test tube and dried in an oven dryer at 105 °C until constant weight (around 72 h).…”

Section: Methodsmentioning

confidence: 97%

“…subcritical water extraction) as reported elsewhere (Flórez‐Fernández et al ., ). Autohydrolysis processing with hot compressed water under non‐isothermal conditions has been successfully proposed as pre‐treatment or treatment for the extraction of bioactive compounds from a broad range of agricultural wastes as barley husks (Conde et al ., ), forestry sources as lignocellulosic wastes (Conde et al ., ) or marine matrices as invasive Sargassum muticum brown seaweeds (Balboa et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Recovery of phytochemical compounds from natural and blanched green broccoli using non‐isothermal autohydrolysis

González‐Muñoz

Conde

Domı́nguez

et al. 2018

Int J of Food Sci Tech

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The temperature effect during autohydrolysis of natural and blanched broccoli was studied. For this purpose, the extraction yield, total phenolic content, antioxidant capacity and glucosinolates type and content of the autohydrolysis liquors have been determined. The development of alginate based hydrogels using the autohydrolysis liquid phase as solvent and the corresponding textural characterisation was also evaluated. In all cases, extraction yields rose with the autohydrolysis temperature up to 150°C and then decreased. For liquors from natural samples, total phenolic content and antioxidant capacity increased with increasing operation temperature. The opposite trend was identified for blanched samples. Comparable values were obtained at 150°C for liquors from natural samples and those blanched treated at 100°C. Glucosinolates content decreased with increasing temperature. Glucoiberin, glucoraphanin, gluconapin, glucobrassicin and gluconasturniin were detected. Hydrogels with suitable textural properties were formulated with the extracted liquors at 100 and 150°C, independently of the blanching treatment.Phytochemical valorisation of broccoli wastes M. J. Gonz alez-Muñoz et al.

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Recovery of phenols from autohydrolysis liquors of barley husks: Kinetic and equilibrium studies

Cited by 16 publications

References 43 publications

Adsorption Study of Lignin Removal from Recycled Alkali Black Liquor by Adsorption Resins for Improved Cellulase Hydrolysis of Corn Straw

Adsorption Study of Lignin Removal from Recycled Alkali Black Liquor by Adsorption Resins for Improved Cellulase Hydrolysis of Corn Straw

Production of phenolic compounds and antioxidant activity via bioconversion of wheat straw by Inonotus obliquus under submerged fermentation with the aid of a surfactant

Recovery of phytochemical compounds from natural and blanched green broccoli using non‐isothermal autohydrolysis

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