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When it comes to sample cleanup the question occasionally comes up asking what technique is best for my application: Solid Phase Extraction (SPE) or Supported Liquid Extraction (SLE)? Well, what’s rig...
There is often confusion as to how to choose the proper SPE ion exchange media. How do you determine if you should be looking at anion or cation, weak or strong? In this post, I will give some simple ...
When running through the exhaustive process of method development, most of us put the majority of our focus on validation and how to complete our crazy validation checklists. Throughout this process, ...
LC/MS/MS seems to be the gold standard in sample analysis nowadays. However, some labs are still analyzing samples using GC/MS. The majority of published peer-reviewed articles are for LC/MS/MS, so th...
In this blog post, we will discuss how to determine the optimal sample volume for a sorbent bed mass. We have developed an adequate solid phase extraction method for our laboratory. However, we're sta...
Solid-phase extractions (SPE) can be a long and sometimes complicated process. So, we want to make sure that everything works the first time we extract. In this blog post, I will be discussing some of...
If you are frustrated with low recoveries caused by protein binding during Supported Liquid Extraction (SLE) and Solid Phase Extraction (SPE), this blog post will give you a few tips. Proper sample pr...
It happens to all of us. We're getting a new method developed and validated and then it comes time to run our negative urines. And everything comes up as positive! There are peaks for our analytes of ...
Have you ever encountered problems loading your samples onto an SPE or SLE plate? Aside from sample viscosity or cartridge blockages, a good troubleshooting step to start with is ensuring that you are...
Most clinical and forensic labs have a used a traditional approach for drug testing called screen with reflex to confirmation. This involves analyzing samples using an immunoassay technique that ident...