Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Isolation and characterisation of antioxidant compounds in yellow rose root extract
Download
index.pdf
Date
2009
Author
Kyejussa, Yusuf
Metadata
Show full item record
Item Usage Stats
284
views
113
downloads
Cite This
A phytochemical investigation on methanolic extract of roots of yellow rose led to the isolation of a catechin gallate. The crude extract first underwent fractionation using petroleum ether, chloroform, ethylacetate, butanol with water as solvents in their respective order. The emerging solvent fractions were subjected to further separation using lipophilic sephadex (LH-20), and silica gel column chromatography to isolate pure compounds. Analytical thin layer chromatography (TLC) was used to confirm the presence of a catechin in butanol fraction. Purified catechin compound was subjected to 2,2-diphenyl-1-picrylhydrazyl (DPPH) experiment to determine its Radical Scavenging Capacity, which was found quite promising. Chemical structure of purified compound was established by using Nuclear Magnetic Resonance (NMR) and Mass Spectrometry (MS) experiments.
Subject Keywords
Chemistry.
URI
http://etd.lib.metu.edu.tr/upload/3/12610686/index.pdf
https://hdl.handle.net/11511/18558
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Synthesis of spiro-containing 1,4-oxazepines from N-propargylic beta-enaminones
Karadeniz, Eda; Kelgökmen, Yılmaz; Zora, Metin (2018-03-18)
An efficient and general method for the synthesis of spiro‐1,4‐oxazepines and 3,3‐dimethyl‐1,4‐oxazepines is reported. When treated with ZnI2 and AgSbF6 in refluxing DCE, cyclohexane‐embedded N‐propargylic β‐enaminones underwent 7‐exo‐dig cyclization to afford spiro‐1,4‐oxazepines, specifically 12‐methylene‐11‐oxa‐7‐azaspiro[5.6]dodeca‐7,9‐dienes, in good to high yields. Accordingly, N‐(1,1‐dimethyl)propargylic β‐enaminones produced 3,3‐dimethyl‐1,4‐oxazepines. Cyclization was found to be general for a dive...
ANALYSIS OF DIFFUSION AND SORPTION OF CHLORINATED HYDROCARBONS IN SOIL BY SINGLE-PELLET MOMENT TECHNIQUE
CABBAR, C; DOGU, G; Doğu, Timur; MCCOY, BJ; SMITH, JM (American Chemical Society (ACS), 1994-07-01)
The single-pellet moment technique was shown to be a powerful method for investigating the diffusion and adsorption of volatile hydrocarbons in the soil. The technique was used to evaluate effective diffusivities, adsorption equilibrium, and rate constants of chlorinated hydrocarbons (monochloroethane, 1,2-dichloroethane, 1,1,1-trichloroethane, and 1,1,2-trichloroethane). Results obtained in a dry system showed that adsorption rate constants of all these hydrocarbons on the soil pellet used are of the same ...
Synthesis and characterization of fully aromatic thermotropic liquid-crystalline copolyesters containing m-hydroxybenzoic acid units
Yerlikaya, Z; Aksoy, S; Bayramlı, Erdal (Wiley, 2001-10-01)
A series of fully aromatic copolyesters based on p-acetoxybenzoic acid (p-ABA), hydroquinone diacetate (HQDA), terephthalic acid (TPA), and m-acetoxybenzoic acid (m-ABA) were prepared by a modified melt-polycondensation reaction. The copolyesters were characterized by DSC, thermogravimetric analysis, H-1 NMR, polarized optical microscopy, X-ray diffraction, and intrinsic viscosity measurements. The copolyesters exhibited nematic liquid-crystalline phases in a broad temperature range of about 150 degreesC, w...
Growth of gold films on quartz surfaces for quartz crystal microbalance application
Özkan, Berrin; Danışman, Mehmet Fatih; Department of Chemistry (2010)
In this study, we have investigated the effect of substrate temperature, use of adhesive layer, deposition rate, annealing and substrate prebaking on the morphology of gold films deposited onto quartz surfaces. For the film growth, physical vapor deposition methods namely electron beam and thermal depositions have been used. Surface morphology of the films have been characterized with atomic force microscopy. Our aim was to confirm the general trends observed for these parameters in our evaporator system fo...
Synthesis and properties of thermotropic liquid crystalline copolyesters containing p-hydroxyphenylacetic acid and m-hydroxybenzoic acid units
Yerlikaya, Z; Aksoy, S; Bayramlı, Erdal (Informa UK Limited, 2006-03-01)
A series of copolyesters based on p-acetoxybenzoic acid (p-ABA), m-acetoxybenzoic acid (m-ABA), and p-acetoxyphenylacetic acid (p-APAA) were prepared by a modified melt polycondensation reaction. The effect of linear p-ABA structure, kink m-ABA and flexible p-APAA moiety on the properties of copolyesters were systematically investigated. The copolyesters were characterized by DSC, thermogravimetric analysis, 1 H-NMR, polarized optical microscopy, X-ray diffraction, and intrinsic viscosity measurements. The ...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
Y. Kyejussa, “Isolation and characterisation of antioxidant compounds in yellow rose root extract,” M.S. - Master of Science, Middle East Technical University, 2009.
