MICROWAVE-ASSISTED SEED ESSENTIAL OIL OF ELEUTHEROCOCCUS SENTICOSUS AND ITS ANTIOXIDANT AND FREE RADICAL-SCAVENGING ACTIVITIES

2012 ◽  
Vol 37 (1) ◽  
pp. 119-127 ◽  
Author(s):  
VIVEK K. BAJPAI ◽  
AJAY SHARMA ◽  
SUNG HONG KIM ◽  
YONGHO KIM ◽  
JONG-JOO KIM ◽  
...  
Keyword(s):  
Free Radical ◽  
Essential Oil ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Eleutherococcus Senticosus ◽  
Microwave Assisted ◽  
Free Radical Scavenging Activities

scholarly journals Chemical Composition of the Essential Oil of Ligularia hodgsonii and Free Radical Scavenging Activity of the Oil and Crude Extracts

2014 ◽  
Vol 9 (10) ◽  
pp. 1934578X1400901
Author(s):  
Zihao Zhou ◽  
Jun Tang ◽  
Xueping Song
Keyword(s):  
Free Radical ◽  
Chemical Composition ◽  
Essential Oil ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Ethanolic Extract ◽  
Free Radical Scavenging ◽  
Total Oil ◽  
Lower Capacity ◽  
Free Radical Scavenging Activities

The chemical composition of the essential oil from roots and rhizomes of Ligularia hodgsonii was analyzed by gas chromatography (GC) and GC-mass spectrometry (MS). Forty-seven components were identified, representing 77.0% of the total oil. The main constituents were l-(+)-ascorbic acid 2,6-dihexadecanoate (15.7%), selina-6-en-4-ol (8.4%) and 9,10-dimethyl-1,2,3,4,5,6,7,8-octahydroanthracene (6.6%). The free radical scavenging activities of the essential oil, aqueous extract, ethanolic extract, and crude polysaccharides of L. hodgsonii, as well as some of their major components, were investigated using DPPH and ABTS assays. The essential oil displayed a lower capacity to quench free radicals than the extracts; the ethanolic and aqueous extracts showed considerably higher antioxidant potential that deserves further study.

scholarly journals Composition, Antimicrobial and Free-radical Scavenging Activities of the Essential Oil of Plectranthus marrubatus

2012 ◽  
Vol 7 (5) ◽  
pp. 1934578X1200700
Author(s):  
Kaleab Asres ◽  
Solomon Tadesse ◽  
Avijit Mazumder ◽  
Franz Bucar
Keyword(s):  
Free Radical ◽  
Essential Oil ◽  
Broad Spectrum ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Gas Chromatography Mass Spectrometry ◽  
Diffusion Method ◽  
Traditional Use ◽  
Fungal Strains ◽  
Free Radical Scavenging Activities

Essential oil from the aerial part of Plectranthus marrubatus J. K. Morton (Lamiaceae), obtained by hydrodistillation was analyzed by gas chromatography/mass spectrometry (GC/MS) and evaluated for antimicrobial and free radical scavenging activities. Twenty-four compounds representing 99% of the total oil were identified. The major constituents were thymol, p-cymene and γ-terpinene. The oil was tested against 21 bacterial and 4 fungal strains using the disc diffusion method and found to be active against a broad spectrum of pathogens including Gram-positive and Gram-negative bacteria as well as some fungal strains. The minimum inhibitory concentrations (MICs) of the oil against the bacterial strains tested ranged from 10 to 800 μg/mL, and from 400 to 800 μg/mL against the fungal strains employed. The in vitro antioxidant activity was assessed using 2,2-diphenyl-1-picrylhydrazil (DPPH) and showed a low EC50 value of 0.15 μl/mL. The study provides evidence for the broad-spectrum antimicrobial and antioxidant effect of Plectranthus marrubatus essential oil, and a possible explanation for its traditional use in the treatment of cold, fever, stomach disorder, diarrhea and as a skin cleaner.

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