Re: [DIYbio] Re: I want to test my own food - where do I start

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:

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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