Welcome to the Biotage Sample Preparation Blog

      Dilute & shoot ... yourself in the foot

      October 21, 2020 at 8:30 AM / by Simonetta Tumbiolo posted in SLE Supported Liquid Extraction, Sample preparation, Method development, Clinical

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      Urine samples are composed of many interferents which can cause ion-suppression or ion-enhancement when analyzing by mass spec. Build up of these matrix components over multiple sample injections can lead to loss of signal in the mass spec and even unexpected changes in your chromatographic separation. We are going to discuss why not performing adequate sample prep can be detrimental for your analyses.

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      When should I choose SPE instead of SLE?

      October 9, 2020 at 8:00 AM / by Stephanie J. Marin, Ph.D. posted in SLE Supported Liquid Extraction, SPE, Solid-phase extraction

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      When would I choose SLE? When would I choose SPE? We all have faced those questions. Let's have a look at the two sample preparation techniques. 

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      Synthetic Cannabinoids: how to extract them from whole blood?

      August 26, 2020 at 2:41 PM / by Jillian Neifeld, MS posted in SLE Supported Liquid Extraction, Forensic, Clinical, Whole Blood, Cannabinoids

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      Synthetic cannabinoids are some of the most widely abused drugs in the world. They are structurally similar and have similar effects to marijuana but are frequently referred to as “legal highs”. Chemists are constantly changing the structures of these compounds to keep them in a legal state and governments can’t keep up with adding them to scheduled lists. So, how do we analyze for these compounds? How can they be easily extracted from whole blood?

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      There and Square Again: A Frit Coverage Tale

      August 20, 2020 at 8:00 AM / by Jeremy Smith posted in Troubleshooting and Optimization, Loading Techniques, SLE Supported Liquid Extraction, Sample preparation

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      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 achieving complete frit coverage on the load.

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      Extracting both acidic and basic analytes in a single SLE procedure

      August 9, 2020 at 8:00 AM / by Bruce Kempf posted in SLE Supported Liquid Extraction

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      Often the question arises asking how can I extract both acids and bases with the same Supported Liquid Extraction (SLE) procedure. Is this possible? And how?

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      How to extract and analyze for ever-present contaminants of interest?

      August 6, 2020 at 8:00 AM / by Jillian Neifeld, MS posted in SLE Supported Liquid Extraction, Sample preparation, Method development

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      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 interest in every urine that we run! How is that possible?

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      Techniques for disrupting protein binding in sample preparation

      August 2, 2020 at 8:00 AM / by Bruce Kempf posted in SLE Supported Liquid Extraction, SPE, Sample preparation, Solid-phase extraction, Method development

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      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 pre-treatment is the key to solving this issue.

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      When should I choose SLE or SPE for sample cleanup?

      July 13, 2020 at 9:21 AM / by Bruce Kempf posted in SLE Supported Liquid Extraction, SPE

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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 right for you depends on your application and the characteristics of your analytes. This post outlines some of the advantages, disadvantages and limitations of each technique.

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      How to determine recovery and matrix effects for your analytical assay

      June 30, 2020 at 10:50 AM / by Dan Menasco posted in SLE Supported Liquid Extraction, Extraction method optimization

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      For many of us developing an analytical assay requires numerous experiments in addition to lots of data review, and yet despite the feeling of confidence in our success, how reliable is our assay really? How do we measure reliability of our assay?

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      What’s the Best Way to do Supported Liquid Extraction?

      June 23, 2020 at 4:09 PM / by Stephanie J. Marin, Ph.D. posted in SLE Supported Liquid Extraction, Sample preparation

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      Supported Liquid Extraction (SLE) is a sample preparation technique that has been in use for over ten years now, but many analytical chemists don’t know about, or understand the best way to do an SLE extraction.  In this post, I’m going to talk about how SLE works and the proper way to do an SLE extraction for sample clean up.

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