Gel Documentation Systems: A Complete Guide to Imaging, UV Transillumination, and Quantitative Analysis
A gel documentation system captures, archives, and quantifies images of agarose and polyacrylamide gels stained with nucleic acid stains, fluorescent stains, or protein stains such as Coomassie Blue and fluorescent protein stains. These gel imaging systems combine UV transillumination, white and blue light illumination, and fluorescent detection in a single instrument so labs can capture images and analyze data efficiently. The technology sits at the intersection of UV transillumination, optical imaging, and densitometric analysis. Whether you are documenting a routine PCR product, validating a cloning step, or quantifying band intensities for a publication, the choice of system determines what level of detail you can extract from each gel. This guide covers the principles behind UV transillumination, the gel electrophoresis image acquisition steps, the technical criteria that distinguish a routine documentation tool from a high performance instrument, the wavelength choices across the visible spectrum, and the densitometry workflows that turn gel images into publishable data.
