一応メーカーのHPには以下のような記述があります。
しかし、マーカーだけは多めに入れてみても綺麗に流れるんですよね。
不思議です。
Why am I seeing smeared or smiling DNA band(s) or discrepant DNA migration?
Many customers use GelRed precast gels for convenience. However, because GelRed and GelGreen are high affinity dyes designed to be larger dyes to improve their safety, they can affect the migration of DNA in precast gels. Some samples, such as restriction digested DNA may migrate abnormally in GelRed precast gels. The following modifications may improve band resolution in precast gels.
Reduce the amount of DNA loaded. Smearing and smiling is often caused by overloading of DNA. The recommended loading amount for ladders and samples of known concentration is 50-200 ng/lane. For samples of unknown concentration, try loading one half or one third of the usual amount of DNA.
Reduce the amount of GelRed in the gel, for example use 0.5X instead of 1X final concentration of GelRed.
Pour a lower percentage agarose gel. Higher molecular weight DNA separates better with a lower percentage gel.
Change the running buffer. TBE buffer has a higher buffering capacity than TAE buffer.
To avoid any interference the dye may have on DNA migration, we recommend using the post-staining protocol. If your application requires loading more than the recommended amount of DNA, use the post-staining protocol. |
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