Repellency property of long chain aliphatic methyl ketones against <i>Anopheles gambiae</i> s.s

Long chain aliphatic methyl ketone series of C 7 -C 15 were tested for repellency activity against the malaria transmitting mosquito Anopheles gambiae s.s.All methyl ketones produced a dose dependent (P<0.001)repellency response with 2-tridecanone giving comparable protection efficacy to DEET at 10% and 1% concentrations.Aliphatic methyl ketones of C 7 -C 10 had lower activity than those of C 11 -C 15.However, within this range compounds with odd carbon atoms (2-undecanone, 2-tridecanone and 2-pentadecanone) were more effective than compounds with even carbon atoms (2-decanone and 2-dodecanone).Comparable repellency activity of 2-tridecanone to DEET show that, it may save as Anopheles gambiae s.s.mosquito repellent.