Question: why tae buffer is used in electrophoresis?
Answer: The combination of the buffer TA and EDTA (TAE) is used for agarose gel electrophoresis of large DNA fragments (2kb or larger) because it is thought to be easier to extract large DNA fragments when you use acetate. A more popular buffer for DNA agarose electrophoresis is TBE (acetic acid is replaced by boric acid).