Organic dyes, such as Coomassie blue, can be used for this purpose; nevertheless, their low sensitivity and a detection range that goes from 1 to 50 ng can be a challenge for detecting low abundance proteins (Jin, Huang, Yoo, & Choi, 2006). A higher sensitivity can be achieved by fluorescent staining techniques (from 0.1 to 10 ng.); however, UV instruments are necessary in order to read the data (Jin et al., 2006). The most sensitive method up to date is radiolabeling, but the requirement of hazardous isotopes and their complex management makes it a complicated procedure (Jin et al., 2006). Silver staining is a method that offers great sensitivity and an easy to handle protocol, thus making it one of the most commonly used staining methods.
 Bio-rad.com, 'Coomassie Stains', 2015. [Online]. Available: http://www.bio-rad.com/webroot/web/images/lsr/products/electrophoresis/product_overlay_content/global/lsr_biosafe_coomasie_gel.jpg. [Accessed: 14- Jun- 2015].