Sequential solvent fractionation of lignin for selective production of monoaromatics by Ru catalyzed ethanolysis

Kim, Jae‐Young; Park, Shin Young; Lee, Jae Hoon; Choi, In-Gyu; Choi, Joon Weon

doi:10.1039/c7ra11541e

Cited by 37 publications

(30 citation statements)

References 45 publications

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“…The crude extract of (36.8g)MyrtuscommunisL. is fractionated sequentially by liquid-liquid extraction in a separatory funnel in n-hexane, diethyl ether, chloroform, dichloromethane, ethyl acetate and n-butanol 20,28 .…”

Section: Extraction and Fractionationmentioning

confidence: 99%

“…The determination of inhibition zone of the extracts and fractions were tested using agar well diffusion method by taking one gram positive bacterial strain; Staphylococcus aureus and one gram negative bacterial strain; Escherichia coli. The zone of inhibition was compared against reference antibiotics, ciprofloxacin 26,27,28 .…”

Section: Measurement Of Inhibition Zonementioning

confidence: 99%

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Phytochemical Screening and Antibacterial Activity of Leaf Extract Ofmyrtuscommunis L. (Adess)

Legesse¹,

Wassie²,

Addissie³

2020

IJAR

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MyrtuscommunisL. (family-Myrtaceae) is an evergreen aromatic medicinal plant which has been used since ancient times for medicinal, food and spice purposes. The main purpose of this study was to screen out phytochemicalsand apply integrated study between methanol extract and solvent fractions on one gram positive bacterial strains (Staphylococcus aureus)and one gram negative bacterial strains (Escherichia coli) based on four selected bacterial strains (Staphylococcus aureus,Enterococcusfaecalis Escherichia coli and klepsela pneumonia,)of preliminary antibacterial test results of M.communis L. leaves. The present study was screen out phytochemicals by maceration method and determine qualitatively depend on Phytochemical test (alkaloid, flavonoid, carbohydrate, protein, amino acid, steroid and phytosterols, tannin, terpenoid, phenol, gum and mucilage, fat and oil, anthraquinone, cardiac glycoside, and saponine) and essential oil by hydrodistilation. Then, to assess the antibacterial activity of methanol extracts and its solvent fractions by agar well diffusion methods.During phytochemical screening test, most of phytochemicals (51.2%) had a positive result. Thus; it is a promising candidate for antibacterial agents. The antibacterial activity of M.communis L. phytochemicals were studded using agar well diffusion method against S.aureus and E.coli showed high activity (24± 1mm and 23.6 ± 0.994mm zone of inhibition in 900µg/well concentration of crude and n-butanol fractions respectively by comparing with controls of ciprophloxacineand DMSO. Thus, from the present study the plant leaf extracts and its solvent fractions of Myrtuscommunis L. showed an abundant production of phytochemicals as secondary metabolites. These phytochemicals (secondary metabolites) of Myrtuscommunis L. leaves crude extract and solvent fractions which are used for the treatment of various diseases caused by microbes.

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Section: Extraction and Fractionationmentioning

confidence: 99%

Section: Measurement Of Inhibition Zonementioning

confidence: 99%

Phytochemical Screening and Antibacterial Activity of Leaf Extract Ofmyrtuscommunis L. (Adess)

Legesse¹,

Wassie²,

Addissie³

2020

IJAR

View full text Add to dashboard Cite

show abstract

“…Variations in these characteristics due to different lignin origins and processing/extraction methods can cause significant alterations in the performance of the final product [24]. A critical dependence on lignin properties was found for several high-value applications [25][26][27][28], such as the production of polymers [16], antioxidants [29], aromatic compounds [30], the synthesis of vanillin [31], and the development of high-performance concrete water-reducing agents [32]. The availability of effective fractionation processes for obtaining lignins with tailored physico-chemical properties and a defined molecular weight distribution is therefore a key requirement to effectively cope with both the upstream material variability and the downstream application requirements.…”

Section: Introductionmentioning

confidence: 99%

Tuning Lignin Characteristics by Fractionation: A Versatile Approach Based on Solvent Extraction and Membrane-Assisted Ultrafiltration

et al. 2020

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Technical lignins, typically obtained from the biorefining of lignocellulosic raw materials, represent a highly abundant natural aromatic feedstock with high potential in a sustainable economy scenario, especially considering the huge primary production volumes and the inherently renewable nature of this resource. One of the main drawbacks in their full exploitation is their high variability and heterogeneity in terms of chemical composition and molecular weight distribution. Within this context, the availability of effective and robust fractionation processes represents a key requirement for the effective valorization of lignin. In the present work, a multistep fractionation of two different well known technical lignins obtained from two distinct delignification processes (soda vs. kraft pulping) was described. A comprehensive approach combining solvent extraction in organic or aqueous medium with membrane-assisted ultrafiltration was developed in order to maximize the process versatility. The obtained lignin fractions were thoroughly characterized in terms of their chemical, physical, thermal, and structural properties, highlighting the ability of the proposed approach to deliver consistent and reproducible fractions of well-controlled and predictable characteristics, irrespective of their biomass origin. The results of this study demonstrate the versatility and the reliability of this integrated multistep fractionation method, which can be easily adapted to different solvent media using the same ultrafiltration membrane set up, thereby enhancing the potential applicability of this approach in an industrial scale-up perspective for a large variety of starting raw lignins.

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“…The recovered lignin fractions were analyzed by gel permeation chromatography (GPC), derivatization followed by reductive cleavage (DFRC) and 2D heteronuclear single quantum coherence nuclear magnetic resonance (2D-HSQC-NMR) spectrum according to our previous study [25]. To determine the weight average (Mw) and number average (Mn) molecular weights, each isolated fraction was first subjected to acetylation in pyridine/acetic anhydride (1:1) solution and was periodically shaken after being maintained at a temperature of 105 • C for 2 h. After this, almost 20 mg of this acetylated lignin was dissolved in 2 mL of tetrahydrofuran and then analyzed using a GPC, Agilent 1200, USA (equipped with an ultraviolet detector (UV) on a PL-gel 5 mm Mixed-c. column, calibrated with polystyrene standards), and THF was used as a mobile phase while it was flowed at a rate of 1 mL/min.…”

Section: Characterization Of Isolated Lignin and Fractionated Biomassmentioning

confidence: 99%

Effects of Gamma-Valerolactone Assisted Fractionation of Ball-Milled Pine Wood on Lignin Extraction and Its Characterization as Well as Its Corresponding Cellulose Digestion

et al. 2020

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Gamma-valerolactone (GVL) was found to be an effective, sustainable alternative in the lignocellulose defragmentation for carbohydrate isolation and, more specifically, for lignin dissolution. In this study, it was adapted as a green pretreatment reagent for milled pinewood biomass. The pretreatment evaluation was performed for temperature (140–180 °C) and reaction time (2–4 h) using 80% aqueous GVL to obtain the highest enzymatic digestibility of 92% and highest lignin yield of 33%. Moreover, the results revealed a positive correlation (R2 = 0.82) between the lignin removal rate and the crystallinity index of the treated biomass. Moreover, under the aforementioned conditions, lignin with varying molecular weights (150–300) was obtained by derivatization followed by reductive cleavage (DFRC). 2D heteronuclear single quantum coherence nuclear magnetic resonance (2D-HSQC-NMR) spectrum analysis and gel permeation chromatography (GPC) also revealed versatile lignin properties with relatively high β-O-4 linkages (23.8%–31.1%) as well as average molecular weights of 2847–4164 with a corresponding polydispersity of 2.54–2.96, indicating this lignin to be a heterogeneous feedstock for value-added applications of biomass. All this suggested that this gamma-valerolactone based pretreatment method, which is distinctively advantageous in terms of its effectiveness and sustainability, can indeed be a competitive option for lignocellulosic biorefineries.

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Sequential solvent fractionation of lignin for selective production of monoaromatics by Ru catalyzed ethanolysis

Abstract: The purpose of this study was to investigate the impact of lignin structure, especially its average molecular weight (Mw) on the distribution of catalytically depolymerized products.

Cited by 37 publications

References 45 publications

Phytochemical Screening and Antibacterial Activity of Leaf Extract Ofmyrtuscommunis L. (Adess)

Phytochemical Screening and Antibacterial Activity of Leaf Extract Ofmyrtuscommunis L. (Adess)

Tuning Lignin Characteristics by Fractionation: A Versatile Approach Based on Solvent Extraction and Membrane-Assisted Ultrafiltration

Effects of Gamma-Valerolactone Assisted Fractionation of Ball-Milled Pine Wood on Lignin Extraction and Its Characterization as Well as Its Corresponding Cellulose Digestion

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