scholarly journals Correlation between chemical composition and radical scavenging activity of 10 commercial essential oils: Impact of microencapsulation on functional properties of essential oils

2020 ◽  
Vol 13 (8) ◽  
pp. 6815-6827 ◽  
Author(s):  
Hoda Hanem Mohamed Fadel ◽  
Ahmed H. El-Ghorab ◽  
Ahmed M.S. Hussein ◽  
Khaled F. El-Massry ◽  
Shereen Nazeh Lotfy ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oils ◽  
Functional Properties ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Scavenging Activity

Chemical Composition and TLC-DPPH-Radical Scavenging Activity ofCyperus alternifoliusRottb. Essential Oils

2017 ◽  
Vol 20 (4) ◽  
pp. 1125-1130 ◽  
Author(s):  
Shimaa S. Elshrif ◽  
Abd El-Nasser G. El Gendy ◽  
Abdelsamed I. Elshamy ◽  
Mahmoud I. Nassar ◽  
Hesham R. El-Seedi
Keyword(s):  
Chemical Composition ◽  
Essential Oils ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Scavenging Activity ◽  
Dpph Radical ◽  
Dpph Radical Scavenging Activity ◽  
Dpph Radical Scavenging

scholarly journals Drying Effects on Chemical Composition and Antioxidant Activity of Lippia thymoides Essential Oil, a Natural Source of Thymol

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2621
Author(s):  
Lidiane Diniz do Nascimento ◽  
Sebastião Gomes Silva ◽  
Márcia Moraes Cascaes ◽  
Kauê Santana da Costa ◽  
Pablo Luis Baia Figueiredo ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Antioxidant Activity ◽  
Chemical Composition ◽  
Essential Oils ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Scavenging Activity ◽  
Dpph Radical ◽  
Dpph Radical Scavenging Activity ◽  
Dpph Radical Scavenging

Leaves of Lippia thymoides (Verbenaceae) were dried in an oven at 40, 50 and 60 °C and the kinetic of drying and the influence of the drying process on the chemical composition, yield, and DPPH radical scavenging activity of the obtained essential oils were evaluated. The composition of the essential oils was determined with gas chromatography-mass spectrometry and gas chromatography-flame ionization detection analyses. The influence of drying on the chemical composition of the essential oils of L. thymoides was evaluated by multivariate analysis, and their antioxidant activity was investigated via the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The Midilli model was the most appropriate to describe the behavior of drying kinetic data of L. thymoides leaves. Thymol was the major compound for all analyzed conditions; the maximum content was obtained from fresh leaves (62.78 ± 0.63%). The essential oils showed DPPH radical scavenging activity with an average of 73.10 ± 12.08%, and the fresh leaves showed higher inhibition (89.97 ± 0.31%). This is the first study to evaluate the influence of drying on the chemical composition and antioxidant activity of L. thymoides essential oils rich in thymol.

Chemical Composition, Antibacterial, Insecticidal and Anti-Oxidant Activities of Three Acantholimon Species (A. atropatanum, A. gilliatii and A. tragacanthium)

2020 ◽  
Vol 10 (3) ◽  
pp. 272-278
Author(s):  
Ardalan Pasdaran ◽  
Satyajit D. Sarker ◽  
Lutfun Nahar ◽  
Azadeh Hamedi
Keyword(s):  
Antibacterial Activity ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Main Compound ◽  
Aerial Parts ◽  
Anti Oxidant ◽  
Gas Chromatography Mass Spectroscopy

Background: The essential oil from the Acantholimon genus have been an integral part of the traditional food additive in Middle East. Most of the plants in Acantholimon genus have not been studied scientifically. The aim of this study is to investigate the chemical composition, antibacterial, insecticidal and anti-oxidant activities of three Acantholimon species including Acantholimon atropatanum, A. gilliatii and A. tragacanthium. Method: The essential oils of the aerial parts were extracted by hydrodistillation. Chemical constitutions were identified by gas chromatography- mass spectroscopy technique, also their toxicities were assessed against the two important grain products pests, Oryzeaphilus mercator and Tribolium castaneum. Antibacterial activity was assessed against the three foodborne bacteria that include Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus based on the disc diffusion assay. Free-radical-scavenging property was identified based on 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity. Results: 2-hexahydrofarnesyl acetone was the main compound in A. gilliatii and A. tragacanthium, whilst farnesyl acetone, heptacosane and germacrene D were the principal components of A. atropatanum essential oil. These oils exhibited 40-90% mortality of O. mercator and/or T. castaneum at a dose of 12 μl/l air after 48h of exposure, and exhibited significant free-radicalscavenging property (RC50 = 3.7 × 10-3 - 8.3 × 10-3 mg/ml). The oils of A. tragacanthium and A. gilliatii showed a weaker antibacterial activity compared to A. atropatanum. Conclusion: A. atropatanum, A. gilliatii and A. tragacanthium essential oils had significant insecticidal and anti-oxidant properties. They also showed week to moderate antibacterial activity against P. aeruginosa and S. aureus.

scholarly journals Mangifera indica Bark Essential Oil: Chemical Composition and Biological Activities in Comparison with Aqueous and Ethanol Extracts

2018 ◽  
Vol 13 (7) ◽  
pp. 1934578X1801300
Author(s):  
Gislaine Aurelie Kemegne ◽  
Maximilienne Ascension Nyegue ◽  
Sylvain Leroy Sado Kamdem ◽  
François-Xavier Etoa ◽  
Chantal Menut
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Radical Scavenging Activity ◽  
Mangifera Indica ◽  
Radical Scavenging ◽  
Antimicrobial Properties ◽  
Scavenging Activity ◽  
Total Phenols ◽  
Dpph Method ◽  
Ethanol Extracts

Ethnobotanic surveys have revealed the use of Mangifera indica L. (Anacardiaceae) bark for the treatment of infectious diarrhea. The essential oil of M. indica bark is described for the first time for its chemical composition, radical scavenging activity (DPPH method) and antimicrobial properties. The total phenols content of its water and ethanol bark extracts as well as their radical scavenging and antimicrobial properties were also evaluated. Four commercial plant extracts were also studied for a comparison purpose. The antimicrobial activities were measured for all samples against three Gram (-): Escherichia coli, Salmonella enteritidis, Shigella and two Gram (+): Staphylococcus aureus and Bacillus cereus bacteria. The M. indica bark essential oil was characterized by the association of two major sesquiterpenes: ( E)-β-caryophyllene (60.3%) and α-humulene (36.7%). It presented the lowest ratio of concentration to inhibition zone diameter on all the strains. The aqueous and ethanol extracts of M. indica bark were characterized by high contents of total phenols compounds and high radical scavenging activity compared to the essential oil. Finally, the interesting combination of the antibacterial and antiradical activities of the aqueous M. indica bark extract justifies the traditional use of this plant part in decoction form for the treatment of diarrheal infections.

scholarly journals CHEMICAL COMPOSITION AND HEPATOPROTECTIVE EFFECTS OF POLYPHENOLIC FRACTION FROM RIVEA HYPOCRATERIFORMIS IN PARACETAMOL INDUCED LIVER DAMAGE IN WISTAR ALBINO RATS

2016 ◽  
Vol 8 (10) ◽  
pp. 228
Author(s):  
Shivakumar S. Godipurge ◽  
Naveen J. Biradar ◽  
Jaiprakash S. Biradar ◽  
Nitin Mahurkar
Keyword(s):  
Lipid Peroxidation ◽  
Chemical Composition ◽  
Hydroxyl Radical ◽  
Liver Damage ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Scavenging Activity ◽  
Aerial Parts ◽  
Hepatoprotective Effects ◽  
Phenolic And Flavonoid

<p><strong>Objective: </strong>This study was designed to chemical composition and hepatoprotective effects of a polyphenolic fraction of aerial parts of <em>R. hypocrateriformis </em>(PPFRH). It was shown to exhibit strong <em>in vitro</em> lipid peroxidation and scavenging activity against hydroxyl radical.</p><p><strong>Methods: </strong>The chemical composition of a polyphenolic fraction of <em>R. hypocrateriformis</em> was analyzed by High-performance liquid chromatography method. Hepatocellular injuries induced by paracetamol were assessed by liver damage in Wistar albino rat; the hepatoprotective effect was evaluated by biochemical parameters in rat serum, antioxidant hydroxyl radical scavenging activity and lipid peroxidation in liver tissue.</p><p><strong>Results: </strong>The polyphenolic fraction of aerial parts of <em>R. hypocrateriformis</em> for lipid peroxidation is significantly (p&lt;0.05). In the hepatoprotective activity of liver enzymes and hepatic necrosis were significantly (p&lt;0.001) closer to paracetamol. The correlation coefficient between the hydroxyl scavenging radical and total phenolic and flavonoid contents were found to be R² = 0.9045 and R² = 0.8876 suggesting the contribution of phenolic and flavonoid compounds of the polyphenolic fraction of aerial parts of <em>R. hypocrateriformis</em> by 90% and 88% to its radical scavenging activity.</p><p><strong>Conclusion: </strong>The polyphenolic fraction of aerial parts of <em>R. hypocrateriformis</em> possesses a significant protective effect against acute hepatotoxicity induced by paracetamol and which may be due to the phenolic and flavonoid components.</p>

scholarly journals Chemical composition, botanical evaluation and screening of radical scavenging activity of collected pollen by the stingless bees Melipona rufiventris (Uruçu-amarela)

2009 ◽  
Vol 81 (2) ◽  
pp. 173-178 ◽  
Author(s):  
Tania M.S. Silva ◽  
Celso A. Camara ◽  
Antonio C.S. Lins ◽  
Maria de Fátima Agra ◽  
Eva M.S. Silva ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Stingless Bees ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Northeastern Brazil ◽  
Scavenging Activity ◽  
Dominant Type ◽  
Etoac Extract ◽  
Pollen Loads ◽  
Pollen Types

Stingless bees in Brazil are indigenous and found all over the country. Bee pollen is used for its nutritional value in the human diet. It is made up of natural flower pollen mixed with nectar and bee secretions. In order to evaluate the chemical composition, free radical scavenging activity, and botanical origin, sample of pollen loads from stingless bee, Melipona rufiventris (Uruçu amarela) was studied. The EtOAc extract of pollen of Melipona rufiventris yielded the following compounds: p-hydroxycinnamic acid, dihydroquercetin, isorhamnetin, isorhamnetin3-O-(6"-O-E-p-coumaroyl)-β-D-glucopyranoside, luteolin, and quercetin. This is the first report of the isolation of isorhamnetin3-O-(6"O-E-p-coumaroyl)β-D-glucopyranoside from pollen. The free radicalscavenging activities of different solvent extracts of pollen were determined using DPPH assay. This activity decreases in the order: EtOAc>EtOH>Hexane extract. It appears that the EtOAc extract of the pollen is a good scavenger of active oxygen species. The botanical evaluation of pollen loads showed the composition by two pollen types, with the dominant type (97.3%) being Scopariadulcis (L.) (Scrophulariaceae) and the minor one Senna obtusifolia (L.) Irwin & Barneby (Fabaceae). This suggests a specific foraging behavior in Melipona rufiventris bees, even in an environment with such a rich botanical diversity as the Northeastern Brazil.

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