I like the last one should be doable but I know that for IR after LC, water could be a problem. Any other IR spectroscopy type that is suitable after LC? Raman is a problem for low sample density so I don't think that would work. On a separate note, the equipment used in academia and big name industry is a bit of an overkill. I mean if you would test milk only, for example, and you know what a liquid chromatography spectra should look like, you don't need MS afterwards to prove what corresponds to which peak.
Gordana
On Monday, August 31, 2015 at 9:43:43 AM UTC-5, Mike Horwath wrote:
-- Gordana
On Monday, August 31, 2015 at 9:43:43 AM UTC-5, Mike Horwath wrote:
Mass spectrometry (usually ICP-MS) is the standard for detecting heavy metals, and can find extremely trace amounts. A tandem chromatography + mass spec setu
p is good for detecting small organic compounds like carcinogens. Unfortunately, this stuff is expensive. Less sensitive methods like flame spectroscopy for metals and column chromatography + IR spectroscopy for organics may be more doable in a DIY setting.
Mike
On Saturday, August 29, 2015 at 9:22:09 AM UTC-4, Gordana Ostojic wrote:I assume that Raman would be great if one is testing a bulk substitution like if milk is replaced with palm oil. What technique is good for traces? Like traces of heavy metals or small carcinogenic compounds in food?I didn't look closely but that DIY Raman looks like an overkill. Raman would be a fairly easy to make with nonmoving parts. You need a lens, grating, filter and CCD (ok if you don't have a ccd and have a single detector, then you need a motor) and laser of course. I would buy from ebay.
On Friday, August 28, 2015 at 8:30:55 PM UTC-5, Branko wrote:Philippo, you might want to check this MOOC course ,scheduled for October :
https://www.futurelearn.com/courses/food-fraud
thanx to all posting in this thread , and pity GMO took over .
Hopefully DIY & afforable non-labeling tech like Raman spectrometer is close :
https://hackaday.io/project/1279-ramanpi-raman- spectrometer
http://www.sciencemadness.org/talk/viewthread.php?tid=23422
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