Blogs for June 2017

Taking a closer look at isotype controls in antibody applications

Thursday, June 29, 2017 - 14:32

With the wide variety of experimental techniques relying on primary antibodies, it is important to use both positive- and negative-controls in your antibody applications. We are generally more familiar with positive controls, which confirm antibody reactivity with a known-positive sample. However, we are often less familiar with adequate negative controls. An example of a negative control is an isotype control, which helps to confirm the specificity of a primary antibody.

Isotype controls may serve as a negative control for flow cytometry, immunohistochemistry and western blotting experiments. This control provides a measure of non-specific binding and may strengthen your experimental findings.

The antibody isotype or class denotes differences in the immunoglobulin’s heavy chain. When choosing an isotype control, select one that matches the clonality and...

Applications Guide: How to choose fluorophore combinations for Flow Cytometry

Wednesday, June 14, 2017 - 11:22

Flow cytometry is an experimental method that was developed to label and examine a high volume of cells in an extremely rapid rate using antibodies conjugated to fluorophores.  The basic concept of flow cytometry is that a cell suspension is situated into a single stream, which then passes through a light source that uses detectors to generate data sets based off cellular properties.  More specifically, the fluorescent light emitted by fluorophores conjugated to antibodies is channeled through selected filters to sort based off preset parameters or targets used. Flow cytometry is particularly useful in cell viability and proliferation assays, as well as diagnosing disease (particularly blood cancers).  When creating a panel of fluorophores for your flow cytometry panel, it is important to follow a few basic guidelines.

First, it is important to understand your flow cytometer.  You should know the type of laser in your instrument, the number of lasers present and...

Make the most of your membrane: PVDF vs. Nitrocellulose

Wednesday, June 7, 2017 - 11:38

The Western Blot – a tried and true experimental protocol where protein structures are separated via molecular weight/charge and transferred to a membrane before visualization by a chemiluminescent solution (say that three times fast!). Seems simple, right?  While the step-by-step process of a western blot has for the most part remained the same over the years, variations in solutions, procedures and reagents may increase the efficacy of your results. For example, when it comes to choosing a membrane for protein transfer there are good arguments for choosing between a PVDF and Nitrocellulose. Which one suits your protein sample best? 

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PVDF

Nitrocellulose


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