Chromatography Forum

I've recieved a bunch of materials From Entech regarding their OMNI-Sampler+ and active SPME system. Has anyone used it? It is claimed to be a faster and less biased form of SPME. I rely heavily on SPME for encapsulated flavors (Mostly qualitative compositional analysis). The flavorists use the % reports as somewhat of a guide in duplications. I was wondering if it might be worth it or I can just keep doing manual SPME.

This is the first I've heard of this so I went to the website:

http://www.entechinst.com/products/head ... ctive-spme

Looks to me like their "active" mode of sampling will suffer from the same limitations from which traditional SPME suffers. Ultimately, it all comes down to how the analytes are trapped in/on the fiber. Blowing the gas over the fiber might improve the mass transfer a little and shorten your analysis time but ultimately, the selectivity won't change a great deal.

I'd have to see some pretty compelling data to sink $ into this. Now, if you're looking for a sampler anyway, then maybe I'd give it a look. I bet it's more $ than a Leap Technologies sampler.

All of that garbage about SPME not be quantitative is just propaganda. I use SPME for quantitative analysis all the time. It may be matrix dependent but if you calibrate in the matrix, it is certainly quantitative.

Just my $0.02.

I find SPME to be good for quantitiation for some things in some matrices but awful for others even with int standards and blank matrix calibrations. Sometimes there are issues with linearity other times there were issues with reproducibility but many compounds gave acceptable results.