Abstract
Rhizophora mangle is an abundant plant in mangroves and tannic acid is a polyphenol produced by the secondary metabolism of plants. The aim of the study was to evaluate the embryotoxic and embriostatic effects of the aqueous extract of R. mangle and synthetic tannic acid on eggs and larvae of Aedes aegypti. A. aegypti eggs were exposed in duplicate at concentrations of 250, 500, 750 and 1000 µg/mL of extract and tannic acid for a period of 14 days. Mineral water was used as a negative control. The eggs were observed and counted in a stereomicroscope (1.2x). In all extract concentrations there was stimulation in hatching in relation to the control, but only in concentration of 750 mg/mL it was statistically significant. In tannic acid (250µg/ml) there was significant stimulus in hatching, but in 500, 750 and 1000 µg/mL there was significant inhibition. All concentrations of aqueous extract and tannic acid on larvae showed embryotoxic and embryostatic effects when compared to the control. The aqueous extract of R. mangle showed effect on hatching of A. aegypti eggs and synthetic tannic acid showed embryotoxic and embryostatic effects. On larvae, both the aqueous extract as tannic acid showed embryotoxic and embryostatic effects.
Highlights
Aedes aegypti is the mosquito that transmits dengue, ZIKA fever, chikungunya fever and yellow fever
The female mosquitoes are responsible for the spread of disease since the oviposition process is dependent on blood repasts
All concentrations of aqueous extract and tannic acid showed statistically significant embryotoxic and embryostatic effects when compared to the control during the 14 days of the experiment (Tables III and IV)
Summary
Aedes aegypti is the mosquito that transmits dengue, ZIKA fever, chikungunya fever and yellow fever. It is a serious public health problem given the complications that cause thouse arboviruses. This insect has acquired great adaptability to human dwellings, accompanying people on their migrations across continents. The female mosquitoes are responsible for the spread of disease since the oviposition process is dependent on blood repasts. Egg maturation or oogenesis starts after the blood repast. In Aedes aegypti complete ovariolar maturation is necessarily related to digestion of one or more blood repasts. If there is no complete intake of blood, the development of oocytes will not pass the first stage (Carron et al 2007)
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