Archive for the ‘Miscellaneous’ Category

Drug Screening can be a Big Pain

I have the privilege of working with a number of talented people here at Restek and when I approached Sharon Lupo about a project last year known affectionately as “The Big Pain” I wasn’t sure how successful she could be. Think about it: Opioids, Barbiturates, Anti-Depressants, Anti-Epileptics, Hallucinogens, etc. all have vastly different chemical make-ups.  […]

Electronic Cigarettes Part VII: Vapor Analysis – How we sampled for VOCs like formaldehyde

If you have been following this blog series, then you already know that we found numerous (upwards of 64) compounds in electronic cigarette solutions. You also know that we found even more (approximately 82) compounds in e-cigarette vapor. More importantly, you know not to waste your time testing the e-juice, because the vaporization process found […]

Need help finding the correct ferrule to install your GC column? Part 3: Perkin Elmer GCs

Need help finding a ferrule to install your column? Part 3: Perkin Elmer GCs You’re ready to install a column into your GC and realize you do not have ferrules to do the job. Which ferrule do you choose?  The parameters to consider when choosing the correct ferrule are instrument make and model, nut size […]

Easy Peasy: Optimized LC-QTRAP Method for Pesticide Residues

Despite what is sometimes advertised, setting up optimized methods for multiresidue pesticide analysis is typically not “easy peasy” and can be quite time consuming. Luckily, some colleagues are willing to share their method with us. Thank you Kelli, James, and Jon!* The downloadable spreadsheet contains retention times, transitions, ionization and collision parameters for our LC […]

Need help finding the correct Ferrule to install your GC Column? Part 2: Bruker/Varian GCs

You’re ready to install a column into your GC and realize you do not have ferrules to do the job. Which ferrule do you choose?  The parameters to consider when choosing the correct ferrule are instrument make and model, nut size and type, ferrule material, and column ID.  A visit to our ferrules home page […]

GC columns – when one is not enough

Often we get asked for a column recommendation for a complex GC analysis.   This is especially true for gas analysis.  Probably the most common request is for separation of fixed (permanent) gases (like O2, N2, CO, CO2, N2O, etc…) plus separation of larger (higher-boiling point) compounds (light hydrocarbons, moisture, sulfur compounds, etc.).  Unfortunately, there is […]

Great Internal Standards for Pesticide Residues…SRMs too!

  In just about all of my pesticide residue work, I use a convenient multicomponent internal standard mix that contains several PCBs as well as popular internal standard compound triphenylphosphate. The mix contains the six compounds in the chromatogram below. I have been working on a method for our GC Multiresidue Pesticides Kit which has […]

Electronic Cigarettes Part VI: Vapor Analysis – Have we made our point? (hint: look for the bold)

In the last electronic cigarette blog we revealed that e-cig vapor has many more constituents than the propylene glycol, glycerin, nicotine, and flavorings on the manufacturer’s solution list. In fact, we found 82 compounds [i.e., unidentified and identified (some only tentatively)] in the vapor of one e-cigarette vendor. Now if you recall from e-cig blog […]

Swagelok® and Parker® Tube Fitting Manuals

When asked by customers for what I consider the best reference guides on Swagelok® and Parker® fittings, I send them the following links.  I thought our blog readers may also benefit from these links, so here they are (below).  I hope you find them useful. Swagelok® Tube Fitter’s Manual Parker® Instrument Tube Fitting Installation Manual […]

Electronic Cigarettes Part V: Vapor Analysis – Yes… we found formaldehyde too!

It has been over 3 months since the last electronic cigarette blog. I will spare you the excuses. However, I can proudly say that we will be releasing a full application note on electronic cigarettes in the very near future (i.e., 1 to 2 months hopefully). In the meantime I feel obliged to respond to […]