Mosa Elhady OsmanAl-Neelain University | Alneelain · Department of Pharmacognosy
Mosa Elhady Osman
B.Pharm (Pharmacy), M.Pharm (Pharmacognosy), PhD (Pharmacognosy)/PostDoc.
About
10
Publications
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25
Citations
Introduction
I have been doing postDoc training in isolation and biological testing of antioxidant constituents from plants at UP.
Additional affiliations
October 2016 - present
September 2016 - present
August 2016 - present
Education
March 2008 - March 2011
Questions
Questions (8)
On TLC the compound have yellow- green color in day light and yellow fluorescence at UV light 365 nm. Its Rf =0.4.mobile phase (toluene:ethylacetate:formic acid)5:4:1, silica gel is stationary phase
When I use this eluent , the top layer of silica gel converted to gel state.
I use hexane:ethylacetate:dichloromethane(3:7:2) but resolved well.
Sample is methylene chloride fraction
When I calculate RSA% using DPPH method I find negative % e.g. - 80%, -18%.
I need formula for calculating %RSA using DPPH method
what are the antioxidant reagents, other than gallic acid, that can be used as positive control in DPPH test?
methodology for identification and characterization?.
Is it better to use HPLC or GC-MS? for analysis of essential oil, alkaloids and flavonoids
what are the suitable solvent for extraction of these phytochemicals
Projects
Project (1)
Extraction and identification using TLC, HPLC from natural products.
