Previously added items:
Thermo Scientific Silica Bead DNA Gel Extraction Kit is a simple and efficient system for DNA extraction from agarose gels and reaction mixtures. The kit utilizes the modified protocol of Vogelstein and Gillespie (see Reference 1), employing solubilization of the agarose gel and selective adsorption of nucleic acids on specially prepared silica particles at high salt concentration. Silica particles bound with DNA are washed to remove contaminants and pure DNA is eluted with TE buffer or water.
This method requires few manipulations, and is both faster and easier to perform than other organic-based extraction methods. Compared to column based gel-extraction kits, the DNA Gel Extraction Kit offers flexibility for scaling reaction and elution volumes up or down. The purified DNA is suitable for all common molecular biology procedures, including restriction digestion, cloning, sequencing, etc.
Care should be taken to avoid DNA damage with UV light when the gel-purified DNA fragment will be used in downstream cloning reactions. Always use a long wavelength UV (360 nm) light-box during excision of the gel slice. If only a short-wavelength UV (254 to 312 nm) light-box is available, minimize the UV exposure to a few seconds or keep the gel on a glass or plastic plate. Alternatively, visible dyes can be included in standard agarose gels to allow for visualization of the DNA bands in ambient light (2, 3).
Figure 1 | Recovery of GeneRuler 100 bp Plus DNA Ladder individual 100 to 3000 bp DNA fragments from a 1.7% agarose gel using the Silica Bead DNA Gel Extraction Kit.M – GeneRuler 100 bp Plus DNA Ladder
Figure 2 | DNA extraction from agarose gel
B. Vogelstein, D. Gillespie, Preparative and analytical purification of DNA from agarose. Proc. Natl. Acad. Sci. USA. 76(2), 615-619 (1979).
K. N. Rand, Crystal Violet can be used to Visualize DNA Bands during Gel Electrophoresis and to Improve Cloning Efficiency. Elsevier Trends Journals Technical Tips. Online, T40022 (1996).
S. Adkins, M. Burmeister, Visualization of DNA in agarose gels and educational demonstrations. Anal Biochem. 240(1), 17-23 (1996).