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Questions related from Jovale Vincent Tongco
I am looking for clear-cut protocols for the quantification of tyrosinase inhibition of plant extracts or isolated compounds from plant sources. What are the differences if crude extracts were...
26 March 2014 4,514 4 View
I may have detected vitamin D3 from my plant extracts using GC-MS. I searched the literature and came up with studies that say it's possible and others that says otherwise. What is your expert...
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Does anyone know a free online UV-Visible spectra database where someone can compare and verify their experimental spectra with? I am dealing with organic compounds (e.g. phenolics).
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Can anyone provide some relevant information on using column chromatography in separating phenolics from crude plant extracts? Is it ok to use silica gel or do I have to use another type of...
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I want to test the ACE inhibitory effect of my phenolic extracts. Can you give me a proper and suitable protocol for doing it? My phenolics came from the leaves of a plant material.
12 July 2013 4,951 9 View
I'm thinking of using either 2D paper chromatography or column chromatography. Which do you think is better if I have many compounds on my sample and I want to estimate their quantity?
02 June 2013 1,465 6 View
I am planning to use either DPPH, ABTS, Nitric Oxide, or Ascorbic acid assay. Due to financial constraints, I can only do two of these assays. Can you help me weigh down my options? Other methods...
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What solvent (system) would you recommend if I'm to extract major components from a commercial tea product. I am thinking of using acetone-water as my solvent. I am planning to do Soxhlet...
29 April 2013 9,277 8 View
