Table I.

Comparison of passive thermal diffusion and electrophoresis lipids extraction.

Methods	Principle	Elution time	Complexity of implementation	Refresh SDS buffer	Volume of SDS buffer	Circulation
Passive thermal diffusion	Transporting surfactant micelles into tissues via heat-induced diffusion	Weeks to months	Easy	Occasionally	Small (several ten milliliters)	No
Electrophoresis	Transporting surfactant micelles into tissues via electric fields	Several days	Difficult	Frequently	Large (several liters for each circulation)	Yes (to control the temperature)