These isolated compounds are from the same plants with same NMR, MS data and molecular formular (mol. masses) but different colours, textures, rf, solubilities which I know has to do with stereochemistry of the compounds.
I isolated a flavonoid with 33 carbon signals from the C-13 NMR.
31 December 2013 2,304 2 View
I isolated some phytochemicals mainly phenolics from some plants that I need to carry out bioassay(s) on them.
11 December 2013 1,115 4 View
I have isolated this flavonoid glycoside from the ethyl acetate fraction of the leaf extract. The C-13, and DEPT135 NMR experiments shows there are 2 carbonyl peaks, 16 other C- peaks as well as...
04 May 2013 853 2 View
I have very polar fractions from TLC which I suspect to be flavonoids. From my findings, I was convinced of the possibility of using a C-18 RP column for the separation. However, I have not used...
03 April 2013 2,257 11 View
Can I possibly use prep TLC for this situation?
09 October 2012 1,093 73 View
Hi, I am after the reference below, my library says it cannot obtain a copy either locally or internationally, any help appreciated! Chris Wang ZM, Heshka S, Wielopolski L, Pi-Sunyer FX, Pierson...
03 March 2021 6,193 1 View
I need to prepare a solution of Napabucasin (inhibitor of cancer cell stemness) in dichloromethane. The drug is expensive, so maybe somebody already tried to do it. If it is soluble, what is the...
02 March 2021 9,945 3 View
I am a little confuse with the mechanism of solid lipid nanoparticles (SLNs). The main point of encapsulating drugs into SLNs is because some drugs have low solubility in water. Therefore, SLNs...
01 March 2021 3,703 3 View
I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...
28 February 2021 6,477 1 View
Are there any published or unpublished statistics or papers on the dropout rate (Dose1 to Dose-2) for Covid-19 vaccination in India, USA, UK, or any other country where vaccination has started at...
28 February 2021 4,237 1 View
Hi, I am a chemistry undergraduate doing my dissertation project on HPLC. In my project, I need to predict the HPLC retention time of 20 aromatic molecules, the calibration set. To do this I will...
24 February 2021 2,602 1 View
I'm a chemistry student and I'm researching the kinetic degradation of mixed plastic waste. I'm having trouble calculating the activation energy by the coats & Redfern method. The data that...
24 February 2021 974 1 View
Are there any differences (outside of the clinical trials that led to their EUA) observed in the rate of infection among those who have received the Pfizer vs Moderna vaccine since the mass...
22 February 2021 9,727 6 View
i have frequencies of bridge that are effected by mass of vehicle. the problem is when any vehicle pass the bridge it would add the its mass to the bridge mass ultimately mass of the bridge will...
22 February 2021 10,004 3 View
Hello everyone , Please tell me if It possible to seperat POlyethelyn glycol -4000 from an aqueuse media by other ways rather heating . I have tried salting out by electrolyte solution to...
22 February 2021 7,285 5 View