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 2,391 2 View
I isolated some phytochemicals mainly phenolics from some plants that I need to carry out bioassay(s) on them.
11 December 2013 1,211 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 940 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 2,354 11 View
Can I possibly use prep TLC for this situation?
09 October 2012 1,261 73 View
I have a response variable called skin yellowness, which I will measure via a scored color chart, whereby 1 is pale yellow and 15 is orange. I'm not sure if this counts as an ordinal variable,...
11 August 2024 4,793 1 View
Can anyone explain this method? Especially the last statement where it says only at 1.5 to 2.5mins was the MS/MS connected to the UPLC. How is that possible, is it a feature in this specific...
11 August 2024 8,141 3 View
Hello experts, Does anyone know any free software about retention index prediction ?
08 August 2024 7,403 2 View
I'm currently working on calculating the collision cross section (CCS) for various ions, and I'm facing challenges when dealing with sodiated and multiply charged ions. Most of the resources I’ve...
08 August 2024 8,329 0 View
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05 August 2024 4,407 0 View
I am currently investigating the cytotoxicity of a series of herbal extracts, and like many studies, I have been using the MTT assay to evaluate cell viability. However, I am encountering a...
31 July 2024 193 4 View
I want to perform a CRISPRa/i library screening for candidate regulatory factors that affect pathogenic Th17 differentiation in PBMC. But I am wondering how to define the size of gene library, so...
31 July 2024 2,150 0 View
EDX analisys
31 July 2024 5,947 2 View
Hi researchers! I'm working on soil texture analysis, and the end result for sand is doubtful because there is black sediment appearing after drying, as shown in the figure. Is it considered sand?...
30 July 2024 557 2 View
Using SPSS, I made my edits in one bar chart — e.g., font type and size, hiding grid lines, and colours, namely: blue, orange, green, purple, and grey for 5 bars, respectively, etc. — and I saved...
29 July 2024 1,981 1 View