I have a plant extract (petro.ether).for antibiotic susceptibility test shall i dissolve that in pet.ether or DMSO? which will be good DMSO or pet ether?
It depends on the method you are going to follow for antimicrobial activity. Pet ether may show activity itself. If DDA is being followed then use of pet ether will not affect the result as it will evaporate from the disc.