scholarly journals Lignin Precipitation and Fractionation from OrganoCat Pulping to Obtain Lignin with Different Sizes and Chemical Composition

Molecules ◽  
2020 ◽  
Vol 25 (15) ◽  
pp. 3330
Author(s):  
Dennis Weidener ◽  
Arne Holtz ◽  
Holger Klose ◽  
Andreas Jupke ◽  
Walter Leitner ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Beech Wood ◽  
Economic Viability ◽  
Antisolvent Precipitation ◽  
Fractionation Procedure ◽  
Lignin Utilization ◽  
Main Components

Fractionation of lignocellulose into its three main components, lignin, hemicelluloses, and cellulose, is a common approach in modern biorefinery concepts. Whereas the valorization of hemicelluloses and cellulose sugars has been widely discussed in literature, lignin utilization is still challenging. Due to its high heterogeneity and complexity, as well as impurities from pulping, it is a challenging feedstock. However, being the most abundant source of renewable aromatics, it remains a promising resource. This work describes a fractionation procedure that aims at stepwise precipitating beech wood (Fagus sp.) lignin obtained with OrganoCat technology from a 2-methyltetrahydrofuran solution, using n-hexane and n-pentane as antisolvents. By consecutive antisolvent precipitation and filtration, lignin is fractionated and then characterized to elucidate the structure of the different fractions. This way, more defined and purified lignin fractions can be obtained. Narrowing down the complexity of lignin and separately valorizing the fractions might further increase the economic viability of biorefineries.

scholarly journals Avocado-Derived Biomass: Chemical Composition and Antioxidant Potential

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 100
Author(s):  
Minerva C. García-Vargas ◽  
María del Mar Contreras ◽  
Irene Gómez-Cruz ◽  
Juan Miguel Romero-García ◽  
Eulogio Castro
Keyword(s):  
Chemical Composition ◽  
Phenolic Content ◽  
Antioxidant Properties ◽  
Total Phenolic ◽  
Nutritional Properties ◽  
Aqueous Fraction ◽  
Extraction Solvent ◽  
Main Components ◽  
A Minor ◽  
Derivatives Of

Avocado has become fashionable due to its great organoleptic and nutritional properties. It is consumed as a fresh product and it is also processed to obtain salad oil and guacamole. In all cases, the only usable portion is the pulp. Therefore, to be a more sustainable and profitable agribusiness, it is important to recognize which compounds from the peel and the stone waste can be converted into valuable bio-products. Therefore, their chemical composition was determined according to the National Renewable Energy Laboratory, the total phenolic content by the Folin-Ciocalteu method and the antioxidant properties by the FRAP and TEAC assays. The main components of the peel and stone were acid-insoluble lignin (35.0% and 15.3%, respectively), polymeric sugars (23.6% and 43.9%, respectively), and the aqueous extractives (15.5% and 16.9%, respectively). Both biomasses contain lipids and protein, but a minor proportion (<6%). The valorization of lignin and sugars is of interest given the high content; stones are a rich source of glucose (93.2% of the polymeric fraction), which could be used to obtain biofuels or derivatives of interest. The extractive fraction of the peel contained the highest number of phenolic compounds (4.7 g/100 g biomass), mainly concentrated in the aqueous fraction (i.e., 87%) compared to the ethanol one, which was subsequently extracted. It correlated with major antioxidant activity and, therefore, the peel can be applied to obtain antioxidants and water can be used as an environmentally friendly extraction solvent.

scholarly journals Variation of the Chemical Composition of Waste Cooking Oils upon Bentonite Filtration

Resources ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 108 ◽  
Author(s):  
Alberto Mannu ◽  
Gina Vlahopoulou ◽  
Paolo Urgeghe ◽  
Monica Ferro ◽  
Alessandra Del Caro ◽  
...  
Keyword(s):  
Particle Size ◽  
Chemical Composition ◽  
Solid Phase ◽  
Volatile Fraction ◽  
X Ray Diffraction ◽  
Specific Chemical ◽  
Waste Cooking Oils ◽  
Main Components ◽  
Cooking Oils ◽  
Chemical Groups

The chemical composition and the color of samples of waste cooking oils (WCOs) were determined prior to and after filtration on two different pads of bentonite differing in particle size. The volatile fraction was monitored by headspace solid-phase microextraction (HS-SPME) coupled with gas-chromatography, while the variation of the composition of the main components was analyzed by 1H NMR. Both techniques allowed the detection of some decomposition products, such as polymers, terpenes, and derivatives of the Maillard process. The analysis of the chemical composition prior to and after bentonite treatment revealed a tendency for the clays to retain specific chemical groups (such as carboxylic acids or double bonds), independent of their particle size. A pair comparison test was conducted in order to detect the sensory differences of the intensity of aroma between the WCO treated with the two different bentonites. In addition, characterization of the bentonite by means of powder X-ray diffraction (XRD) and thermogravimetric measurements (TG) was performed.

scholarly journals Chemical Composition and Antimicrobial Activity of the Essential Oil from Flowers of Eryngium triquetrum (Apiaceae) Collected Wild in Sicily

2016 ◽  
Vol 11 (7) ◽  
pp. 1934578X1601100
Author(s):  
Simona Casiglia ◽  
Maurizio Bruno ◽  
Sergio Rosselli ◽  
Felice Senatore
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Antifungal Activities ◽  
Antibacterial And Antifungal Activities ◽  
Art Works ◽  
Main Components ◽  
Antibacterial And Antifungal ◽  
Historical Art

The chemical composition of the essential oil from flowers of Eringium triquetrum Vahl. collected in Sicily was evaluated by GC and GC-MS. The main components were pulegone (50.6%), piperitenone (30.5%) and menthone (7.0%). Comparison of this oil with other studied oils of Eringium species is discussed. The oil showed good antibacterial and antifungal activities against some microorganisms that infest historical art works.

scholarly journals Comparison of the Chemical Composition and Antimicrobial Activity of Thymus serpyllum Essential Oils

2015 ◽  
Vol 43 (2) ◽  
pp. 432-438 ◽  
Author(s):  
Aneta WESOŁOWSKA ◽  
Monika GRZESZCZUK ◽  
Dorota JADCZAK ◽  
Paweł NAWROTEK ◽  
Magdalena STRUK
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Micrococcus Luteus ◽  
Gas Chromatography Mass Spectrometry ◽  
E Coli ◽  
Thymus Serpyllum ◽  
Main Components ◽  
Total Oil

The chemical composition of the essential oils obtained by hydrodistillation from the aerial parts of Thymus serpyllum and Thymus serpyllum‘Aureus’ has been investigated by gas chromatography-mass spectrometry (GC-MS). Forty-seven compounds (99.67% of the total oil) wereidentified in the essential oil of T. serpyllum. The main components found in the oil were carvacrol (37.49%), -terpinene (10.79%), -caryophyllene (6.51%), p-cymene (6.06%), (E)--ocimene (4.63%) and -bisabolene (4.51%). Similarly, carvacrol (44.93%), -terpinene(10.08%), p-cymene (7.39%) and -caryophyllene (6.77%) dominated in the oil of T. serpyllum ‘Aureus’. A total of forty three compounds wereidentified in this oil, representing 99.49% of the total oil content. On the basis of the obtained data it was proved that the content of 1-octen-3-ol,eucalyptol, (Z)--ocimene, (E)--ocimene, -terpinene, carvacrol methyl ether, germacrene D and -bisabolene was significantly higher for T.serpyllum while T. serpyllum ‘Aureus’ was characterized by a significantly higher content of 3-octanone, 3-octanol, p-cymene, borneol andcarvacrol. The isolated essential oils were evaluated for their antimicrobial activity against nine reference strains (Escherichia coli, Staphylococcusaureus, Staphylococcus epidermidis, Streptococcus agalactiae, Enterococcus faecalis, Bacillus cereus, Micrococcus luteus, Proteus vulgaris and Candidaalbicans) by the microdilution technique. Based on this test, the minimum inhibitory concentrations (MIC) of essential oil were calculated. Thevolatile oil obtained from T. serpyllum showed the highest antimicrobial activity relative to the strain of E. coli (MIC=0.025 μL/mL) and to theyeast C. albicans (MIC=0.05 μL/mL). Similarly, a significant antimicrobial activity exhibited T. serpyllum ‘Aureus’ essential oil, although the MICvalues obtained in that case for E. coli and C. albicans strains were twice as high and were respectively 0.05 μL/mL and 0.1 μL/mL.

Tarczyca bocznokwiatowa (Scutellaria lateriflora) – znaczenie w medycynie tradycyjnej i pozycja we współczesnej fitoterapii

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Inga Kwiecień ◽  
Beata Kawka ◽  
Halina Ekiert
Keyword(s):  
Chemical Composition ◽  
North American ◽  
Folk Medicine ◽  
Raw Material ◽  
Study Results ◽  
Phenylpropanoid Glycosides ◽  
Scutellaria Lateriflora ◽  
Sedative Action ◽  
Main Components

American skullcap (Scutellaria lateriflora L.) has long been used as a medicine by North American Indian tribes. A monograph of Scutellariae lateriflorae herba was included in the American Herbal Pharmacopoeia in 2009. This raw material is very popular in North America because of its sedative action. It is also highly valued in Australia, while in Europe, it has been widely used until now in the United Kingdom. The main components of the herb of this plant species include flavonoids specific for the Scutellaria genus, mostly baicalein, baicalin, wogonin, scutellarin. They are accompanied by other groups of compounds: diterpenoids – neoclerodan derivatives, γ-aminobutyric acid, melatonin, serotonin, catalpol, phenolic acids, phenylpropanoid glycosides (mostly verbascoside) and essential oil. Studies of chemical composition and investigation of medicinal activity of this raw material confirmed its uses known from North American folk medicine. Study results proved most of all a significance of flavonoid compounds present in the raw material for its documented biological activity. The aim of the paper is to review the present knowledge on chemical composition and medicinal significance of this very valuable plant. The research team from the Department of Pharmaceutical Botany JU MC initiated biotechnological studies of this species. Its microshoots successfully grown in vitro produce considerable amounts of specific flavonoids (mostly baicalin and wogonoside) and verbascoside, and in future they can be an alternative rich source of these compounds for pharmaceutical and cosmetic applications.

scholarly journals Composition and in-vitro CytotoxicActivities of the Leaf Essential Oil of Beilschmiedia erythrophloia from Taiwan

2013 ◽  
Vol 8 (1) ◽  
pp. 1934578X1300800
Author(s):  
Yu-Chang Su ◽  
Chen-Lung Ho
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Cytotoxic Activity ◽  
Cancer Cells ◽  
Cytotoxic Activities ◽  
Anticancer Activities ◽  
Leaf Essential Oil ◽  
Main Components ◽  
Type Apparatus

This study investigated the chemical composition and in-vitro cytotoxic activities of the essential oil isolated from the leaf of Beilschmiedia erythrophloia. The essential oil was isolated using hydrodistillation in a Clevenger-type apparatus, and characterized by GC-FID and GC-MS. Fifty-five compounds were identified, representing 100% of the oil. The main components identified were β-caryophyllene (22.6%), α-humulene (21.9%), terpinen-4-ol (5.3%), cis-β-ocimene (5.1%), sabinene (5.0%) and limonene (4.5%). The anticancer activities of oil were evaluated. The results showed that the oil exhibited cytotoxic activity against human oral, liver, lung, colon, melanoma, and leukemic cancer cells.

scholarly journals Chemical Composition of the Essential Oil of Mentha pulegium Growing Wild in Sicily and its Activity on Microorganisms Affecting Historical Art Crafts

2017 ◽  
Vol 12 (8) ◽  
pp. 1934578X1701200
Author(s):  
Simona Casiglia ◽  
Maurizio Bruno ◽  
Gianfranco Fontana ◽  
Felice Senatore
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Mentha Pulegium ◽  
Antibacterial And Antifungal Activities ◽  
Aerial Parts ◽  
Art Works ◽  
Different Populations ◽  
Main Components ◽  
Antibacterial And Antifungal ◽  
Historical Art

The chemical composition of the essential oil from aerial parts of Mentha pulegium L. (Linné) collected in Sicily was evaluated by GC and GC-MS. The main components were pulegone (50.6%), piperitenone (27.8%) and menthone (6.9%). Comparison of this oil with other studied oils of different populations is discussed. The oil showed good antibacterial and antifungal activities against some microorganisms that infest historical art works.

scholarly journals Fragaria Genus: Chemical Composition and Biological Activities

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 498 ◽  
Author(s):  
Radu Claudiu Fierascu ◽  
Georgeta Temocico ◽  
Irina Fierascu ◽  
Alina Ortan ◽  
Narcisa Elena Babeanu
Keyword(s):  
Chemical Composition ◽  
Biological Activities ◽  
Scientific Research ◽  
Biological Properties ◽  
Wide Spread ◽  
Scientific Papers ◽  
The Subject ◽  
Main Components ◽  
By Products ◽  
Fragaria Species

The strawberries represent in our days one of the main fresh fruits consumed globally, inevitably leading to large amounts of by-products and wastes. Usually appreciated because of their specific flavor, the strawberries also possess biological properties, including antioxidant, antimicrobial, or anti-inflammatory effects. In spite of the wide spread of the Fragaria genus, few species represent the subject of the last decade scientific research. The main components identified in the Fragaria species are presented, as well as several biological properties, as emerging from the scientific papers published in the last decade.

scholarly journals In Vitro Antimicrobial Activity of Essential Oil Extracted from Leaves of Leoheo domatiophorus Chaowasku, D.T. Ngo and H.T. Le in Vietnam

Plants ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 453 ◽  
Author(s):  
Nhan Trong Le ◽  
Duc Viet Ho ◽  
Tuan Quoc Doan ◽  
Anh Tuan Le ◽  
Ain Raal ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Inhibitory Concentration ◽  
Antimicrobial Activities ◽  
Antiviral Effects ◽  
Scientific Report ◽  
Main Components ◽  
Hiv 1

The present study aimed to determine the antimicrobial activity and chemical composition of leaves-extracted essential oil of Leoheo domatiophorus Chaowasku, D.T. Ngo and H.T. Le (L. domatiophorus), including antibacterial, antimycotic, antitrichomonas and antiviral effects. The essential oil was obtained using hydrodistillation, with an average yield of 0.34 ± 0.01% (v/w, dry leaves). There were 52 constituents as identified by GC/MS with available authentic standards, representing 96.74% of the entire leaves oil. The essential oil was comprised of three main components, namely viridiflorene (16.47%), (-)-δ-cadinene (15.58%) and γ-muurolene (8.00%). The oil showed good antimicrobial activities against several species: Gram-positive strains: Staphylococcus aureus (two strains) and Enterococcus faecalis, with Minimum Inhibitory Concentration (MIC) and Minimum Lethal Concentration (MLC) values from 0.25 to 1% (v/v); Gram-negative strains such as Escherichia coli (two strains), Pseudomonas aeruginosa (two strains) and Klebsiella pneumoniae, with MIC and MLC values between 2% and 8% (v/v); and finally Candida species, having MIC and MLC between 0.12 and 4% (v/v).Antitrichomonas activity of the oil was also undertaken, showing IC50, IC90 and MLC values of 0.008%, 0.016% and 0.03% (v/v), respectively, after 48h of incubation. The essential oil resultedin being completely ineffective against tested viruses, ssRNA+ (HIV-1, YFV, BVDV, Sb-1, CV-B4), ssRNA- (hRSVA2, VSV), dsRNA (Reo-1), and dsDNA (HSV-1, VV) viruses with EC50 values over 100 µg/mL. This is the first, yet comprehensive, scientific report about the chemical composition and pharmacological properties of the essential oil in L. domatiophorus.

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