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Questions related from Haoxin Li
I isolated several different pentacyclic triterpenes from a plant source. I am sure they are all known but I am still trying to identify them with only proton and carbon NMR. I find it is very...
05 May 2014 7,662 10 View
Do polyketides have some characteristics of porton NMR singals? For example, terpenes have the characteristics of methyl singlets between 0.5 and 1 ppm? Is there a way that you can tell if a...
07 July 2013 9,002 1 View
We have a old waters 2487 UV detector in our lab and we were trying to hook it up with a normal phase HPLC, but the channel with 190 nm wavelength is always jumping round creating hung background...
06 June 2013 5,259 7 View
Our lab has an old LC/MS with Agilent 1100 LC and API 2000 triquad mass spec. I want to do some quantification work on specific compounds from plant extracts. Can anyone help me with setting up...
06 June 2013 9,365 9 View
I have isolated some betulinic acid from a plant extract, but I can not find a way to dissolve the compound to run NMR. From the literature, people would use pyridine to dissolve it, but it's very...
05 May 2013 7,027 10 View
