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Published on: October 22, 2020
A novel method for measuring fructose ingestion by mosquitoes
Rodrigo Dutra Nunes1, Ricardo Lourenço de Oliveira, Glória Regina Cardoso Braz
1Laboratório de Bioquímica de Vetores de Doenças, Departamento de Bioquímica, Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
Summary
Researchers adapted the Seliwanoff method to quantify fructose in mosquitoes, finding it more sensitive than the anthrone test. This method revealed insights into mosquito sugar intake and digestion times.
Area of Science:
- Entomology
- Biochemistry
- Analytical Chemistry
Background:
- Quantifying fructose in mosquitoes is crucial for understanding their feeding behavior and ecological roles.
- Existing methods, like the anthrone test, have limitations in sensitivity and reliability for small sample sizes.
- The Seliwanoff method offers a potential alternative for precise fructose quantification.
Purpose of the Study:
- To adapt and validate the Seliwanoff method for quantifying fructose in individual mosquitoes.
- To compare the sensitivity and reliability of the adapted Seliwanoff method with the anthrone test.
- To investigate sugar intake and digestion dynamics in Aedes aegypti and Aedes albopictus mosquitoes.
Main Methods:
- Adaptation of the Seliwanoff colorimetric method for fructose quantification.
- Determination of the minimum detection limit and sensitivity of the adapted method.
- Laboratory experiments to measure sugar intake and digestion time in Aedes mosquitoes.
- Application of the method to field-collected Aedes aegypti.
Main Results:
- The adapted Seliwanoff method demonstrated a minimum detection limit of 2.4 µg of fructose, showing higher sensitivity and reliability than the anthrone test.
- Aedes albopictus exhibited higher sugar intake (up to 1.7 times) compared to Aedes aegypti.
- Female mosquitoes ingested significantly more sugar (up to 2.5 times) than males in both species.
- Fructose was undetectable in mosquitoes after 48 hours, indicating complete digestion.
- Field-collected Aedes aegypti, including females, were found to contain fructose, confirming sugar feeding.
Conclusions:
- The standardized Seliwanoff method is a reliable and sensitive tool for quantifying small amounts of fructose in individual mosquitoes.
- This method provides valuable data on mosquito feeding habits, including species-specific intake and sexual dimorphism in sugar consumption.
- The findings confirm that Aedes aegypti females actively feed on sugars, contributing to our understanding of their biology and behavior.
