Repellent Activity Of Essential Oils From Andean Species Of San Juan Against Triatoma Infestans

LOPEZ SANDRA; ZYGADLO J,; ARAGÓN L,; FERESIN G. E.; LÓPEZ M.L.; TAPIA A

Ciudad de La Punta, San Luis

Congreso; XXVII Congreso Anual de la Sociedad de biologia de Cuyo; 2009

Sociedad de Biologia de Cuyo

Chagas disease is a major public health concern in Argentina with estimates near three millions infected people. Essential oils from (EO) Azorella cryptantha and Gymnophyton polycephalum were assayed in vitro for their repellence activity against five instar nymphs of T infestans, the vector of Chagas disease. Fresh aerial parts were hydrodistilled to obtain the EO in a Clevenger type apparatus. EO were evaluated at 1, 24 and 72 hours of treatment. Chemical composition was carried out by GC-MS. Percent Repellency (PR) was determined according to standard method. Analysis of EO oils identified 16 components for G. polycephalum representing 96.74 % of the EO and 31 components for A. cryptantha, representing 89.06 % of the EO. Main components from G. polycephalum EO were camphene, (E) ƒÀ-ocimene and ƒ¿-phellandrene. Mean repellency was 100 % and 86.7% for A. cryptantha and G. polycephalum respectively, both equivalent to V class. The results provide evidence that Andean species, should be sheltered due to the bioactivity of the EO to alleviate local problems as ChagasL disease.