Measuring proteins with the Bradford assay
Methods for measuring protein concentration using the Open Colorimeter and 595nm LED.
Tutorials
Tutorials are project-based posts and step-by-step guides on ways to make or use open source tools in science investigations.
Electrochemistry: Current dependence on scan rate
In this tutorial we use the Rodeostat potentiostat and a screen printed electrode to demonstrate current dependence on scan rate. We know that for freely-diffusible analytes like ascorbate, the anodic peak current depends linearly on the square root of the scan rate. This is described by the Randles-Sevcik equation. The
Nitrate-API colorimetric assay
Colorimetric assay for measuring nitrate levels using API test kit. Range: 0-50ppm
Ammonia-API colorimetric assay
Colorimetric assay for measuring ammonia levels using API test kit. Range: 0-8ppm
Nitrite-API colorimetric assay
Colorimetric assay for measuring nitrite levels using API test kit. Range: 0-2ppm
Measuring blue food dye in sports drinks
Goal: Use the Open Colorimeter to experimentally calculate the molar extinction coefficient of FD&C Blue #1
Beer’s Law states that absorbance of a sample (Abs) depends on the molar concentration (c), light path length in centimeters (l), and molar extinction coefficient (ε) for the dissolved substance at the
Making an open source COVID-19 face shield
Like many people, we have been alarmed at the reports of the lack of personal protective equipment (PPE) for healthcare workers on the frontlines of the COVID-19 pandemic. We have been following the work of many individuals and groups on social media making open source PPE as we try to