{"id":12004,"date":"2026-06-28T21:56:38","date_gmt":"2026-06-29T00:56:38","guid":{"rendered":"https:\/\/solvefortomorrowlatam.com\/pratica\/alunas-desenvolvem-larvicida-natural-em-projeto-stem-para-combater-a-dengue-na-escola\/"},"modified":"2026-06-29T09:48:37","modified_gmt":"2026-06-29T12:48:37","slug":"alunas-desenvolvem-larvicida-natural-em-projeto-stem-para-combater-a-dengue-na-escola","status":"publish","type":"pratica","link":"https:\/\/solvefortomorrowlatam.com\/en\/case\/alunas-desenvolvem-larvicida-natural-em-projeto-stem-para-combater-a-dengue-na-escola\/","title":{"rendered":"How students developed a natural larvicide to combat dengue in a STEM Project"},"content":{"rendered":"\n<p>Tropical diseases, such as dengue, chikungunya, and Zika, are still relatively common in countries like Brazil, Colombia, and Peru. In these regions , anyone who has not yet been affected by these diseases likely knows someone who has. With <a href=\"https:\/\/www.who.int\/news\/item\/22-05-2024-new-research-flags-the-urgent-need-for-research-and-evidence-on-the-impact-of-climate-change-on-neglected-tropical-diseases-and-malaria\">climate change<\/a>, the incidence of these diseases has been increasing, despite vaccines and public health surveillance efforts to control the vectors. That is why controlling the spread of the Aedes aegypti mosquito, the vector for these diseases, remains a <a href=\"https:\/\/solvefortomorrowlatam.com\/en\/entry\/social-challenges\/\">social challenge<\/a>, which caught the attention of a group of students from Itumbiara, a town in the interior of Goi\u00e1s state, Brazil.<\/p>\n\n\n\n<p>The team came up with an alternative solution to the problem: creating a natural plant-based larvicide developed from species native to Brazil. The project \u201cEffect of Plant Extracts on <em>Aedes aegypti<\/em>,\u201d a finalist in the 2025 <a href=\"https:\/\/solvefortomorrowlatam.com\/en\/country\/brazil\/\">Solve for Tomorrow<\/a> <a href=\"https:\/\/solvefortomorrowlatam.com\/en\/country\/brazil\/\">Brazil<\/a>, was developed by high school students, in the third-to-last year of compulsory education, aged 15 to 16. The group observed a steady increase in cases of these diseases in the city, especially in 2024, when there were nearly 700 confirmed cases of <em>dengue<\/em> and 530 of <em>chikungunya<\/em> in the municipality. The state, by the way, broke records for infections, drawing special attention from <a href=\"https:\/\/www.gov.br\/saude\/pt-br\/assuntos\/noticias-para-os-estados\/goias\/2025\/novembro\/casos-de-dengue-caem-70-em-goias-mas-ministerio-da-saude-mantem-o-alerta-e-lanca-nova-campanha-de-prevencao\">the Ministry of Health<\/a>, which implemented control measures.&nbsp;<\/p>\n\n\n\n<p>After reading news reports about rising cases, the <a href=\"https:\/\/solvefortomorrowlatam.com\/en\/entry\/mediator-teacher\/\">mediator teacher<\/a>, Ayanda Lima, presented the challenge to her students. \u201cOur school is very large, located near several bars, and it\u2019s very difficult to control the breeding sites of the <em>Aedes aegypti<\/em> mosquito. Many people were on sick leave because of these diseases, so we had to do more than just raise awareness,\u201d she explains.<\/p>\n\n\n\n<p>Initially, with the entire class, the teacher proposed testing the repellent properties of certain plants in the lab. This search for <a href=\"https:\/\/solvefortomorrowlatam.com\/en\/connected-education\/real-problem-solving\/\">solutions to real-world problems<\/a> is already part of the teacher\u2019s pedagogical approach, who teaches biology and experimental science. \u201cI\u2019ve never been the kind of teacher who just asks students to make a poster. We have to seek concrete solutions,\u201d she says. When she joined the Dom Veloso Full-Time Education Center, she helped transform the traditional science fair into an activity more focused on solving local problems. \u201cThe projects began to follow a clearer <a href=\"https:\/\/solvefortomorrowlatam.com\/en\/entry\/scientific-literacy\/\">scientific methodology<\/a>, with an introduction, hypothesis, and objective. It was no longer just a demonstration of knowledge,\u201d she recalls.<\/p>\n\n\n\n\n<div id=\"sp_carousel_block_d2e90a8960473b420b9bae5054e693d8\" class=\"carousel slide\" data-bs-ride=\"carousel\">\n    <div class=\"carousel-inner\">\n                <div class=\"carousel-item active\">\n              <img decoding=\"async\" src=\"https:\/\/solvefortomorrowlatam.com\/wp-content\/uploads\/2026\/06\/WhatsApp-Image-2026-06-05-at-17.25.14.jpeg\" alt=\"Grupo em laborat\u00f3rio escolar com materiais sobre controle da dengue\" class=\"img-fluid\">\n            <\/div>\n                    <div class=\"carousel-item \">\n              <img decoding=\"async\" src=\"https:\/\/solvefortomorrowlatam.com\/wp-content\/uploads\/2026\/06\/WhatsApp-Image-2026-06-05-at-17.25.15.jpeg\" alt=\"Recipiente com larvicida natural para controle de mosquitos\" class=\"img-fluid\">\n            <\/div>\n                    <div class=\"carousel-item \">\n              <img decoding=\"async\" src=\"https:\/\/solvefortomorrowlatam.com\/wp-content\/uploads\/2026\/06\/WhatsApp-Image-2026-06-05-at-17.25.14-1.jpeg\" alt=\"Estudantes manipulam solu\u00e7\u00e3o em atividade sobre dengue na escola\" class=\"img-fluid\">\n            <\/div>\n            \n    <\/div>\n\n\t<div class=\"carousel-indicators\">\n\n    \t\t<button type=\"button\" data-bs-target=\"#sp_carousel_block_d2e90a8960473b420b9bae5054e693d8\" data-bs-slide-to=\"0\" class=\"active\" aria-label=\"Slide 1\"><\/button>\n        \t\t<button type=\"button\" data-bs-target=\"#sp_carousel_block_d2e90a8960473b420b9bae5054e693d8\" data-bs-slide-to=\"1\" class=\"\" aria-label=\"Slide 2\"><\/button>\n        \t\t<button type=\"button\" data-bs-target=\"#sp_carousel_block_d2e90a8960473b420b9bae5054e693d8\" data-bs-slide-to=\"2\" class=\"\" aria-label=\"Slide 3\"><\/button>\n        \n    <\/div>\n\n\t<button class=\"carousel-control-prev\" type=\"button\" data-bs-target=\"#sp_carousel_block_d2e90a8960473b420b9bae5054e693d8\" data-bs-slide=\"prev\">\n\t\t<span class=\"carousel-control-prev-icon\" aria-hidden=\"true\"><\/span>\n\t\t<span class=\"visually-hidden\">Anterior<\/span>\n\t<\/button>\n\t<button class=\"carousel-control-next\" type=\"button\" data-bs-target=\"#sp_carousel_block_d2e90a8960473b420b9bae5054e693d8\" data-bs-slide=\"next\">\n\t\t<span class=\"carousel-control-next-icon\" aria-hidden=\"true\"><\/span>\n\t\t<span class=\"visually-hidden\">Pr\u00f3ximo<\/span>\n\t<\/button>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong><strong>From the lab to the community: testing a formula to combat dengue<\/strong><\/strong><\/h2>\n\n\n\n<p>In laboratory tests, the team developed a method for extracting active substances from plants through maceration. The wingleaf soapberry fruit is immersed in a liquid (in this case, distilled water), which causes the plant\u2019s components to dissolve in the solvent, forming the extract. The wingleaf soapberry plant (<em>Sapindus saponaria<\/em>) showed good results in repelling <em>Aedes aegypti<\/em>, and the team decided to move forward with it, given the teacher\u2019s prior experience with other projects that had used the wingleaf soapberry plant.<\/p>\n\n\n\n<p>With the initial experiments showing positive results, the group began to devise a strategy to bring the solution to the community. During the experimental lab session, they researched <a href=\"https:\/\/mooc.campusvirtual.fiocruz.br\/rea\/edl\/modulo1\/modulo1-aula3.html\">Larvicide Dissemination Stations<\/a> (EDLs), a technique widely used in Brazil to facilitate the spread of larvicide by the mosquitoes themselves, between treated sites and untreated breeding grounds.&nbsp;<\/p>\n\n\n\n<p>It is a low-cost, efficient, and easy-to-replicate strategy: a plastic container filled with water is used to attract mosquitoes, covered with a damp black cloth impregnated with a very fine powdered larvicide. When an adult mosquito lands on the surface of the EDL, particles of the larvicide adhere to the mosquito\u2019s legs and body. Since female <em>Aedes<\/em> mosquitoes prefer to visit many breeding sites to lay just a few eggs at each one, they end up carrying the larvicide with them to these sites, which become lethal traps for immature mosquitoes.<\/p>\n\n\n\n<p>To achieve this, the chemical pesticide pyriproxyfen is typically used. However, the teacher stated that the team wanted to replace it with a natural component. \u201cThis was one of the areas where the mentoring from Solve for Tomorrow helped a lot. It boosted our work, took the results we had in the lab, and showed us the way forward with a natural component and how to take it further,\u201d Lima acknowledges.<\/p>\n\n\n\n<p>To meet the program\u2019s requirements, the class itself selected the five students to represent the group and move forward with the proposal. \u201cNow, the main challenge was to take the extract, which was liquid, and turn it into a gel to apply to the EDL,\u201d she explains.<\/p>\n\n\n\n<div class=\"banner -yellow\">\n    <h5>\n                Eureka moment!    <\/h5>\n    <p><span style=\"font-weight: 400;\">To create the gel, the group had several ideas, such as using cornstarch or cassava starch to thicken the extract. \u201cBut that would have required heating it, and that was a dealbreaker, because the high temperature would destroy its chemical properties\u2014it wouldn\u2019t have worked,\u201d notes the teacher. That\u2019s when it clicked: what if they looked for an option in the opposite direction, using something cold? Through online research, they discovered <\/span><span style=\"font-weight: 400;\">Cold pregelatinized corn starch <\/span><span style=\"font-weight: 400;\">, an inexpensive substance that\u2019s easy to find online. That was the breakthrough the project needed!<\/span><\/p>\n<\/div>\n\n\n<p>Cold pregelatinized corn starch&nbsp; around USD 6,00 (for 500g) and is a product that has already undergone a pre-cooking and drying process, making it more porous and capable of absorbing cold water. As a result, it adds thickness and stability to foods without requiring cooking, which simplifies production and preserves characteristics such as flavor, texture, color, and aroma.&nbsp;<\/p>\n\n\n\n<p>With the gel extract ready, it was time to test it in the community. First, the group identified the locations with the highest concentrations of mosquito breeding sites in the city, with the support of a municipal disease control official. They then selected three sites, where they installed 18 EDLs and continued monitoring for several days, collecting samples to observe the effects on the mosquito larvae. According to the teacher, the class used insect repellent and lab coats and made sure to spend as little time as possible on site to ensure the students\u2019 personal safety.<\/p>\n\n\n\n<p>The results exceeded expectations: \u201cThe mosquito\u2019s life cycle takes 10 days to reach adulthood. We observed that by the eighth day, all the larvae had already died; they hadn\u2019t even reached the pupal stage [the final stage before the adult mosquito emerges]. We were amazed by this result, which went beyond our expectations,\u201d says Lima. Using a sample from the soap extract, distilled water, and pregelatinized cornstarch, any community or school can replicate this solution.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong><strong><strong>Strengthening student leadership and raising the school\u2019s profile in the community<\/strong><\/strong><\/strong><\/h2>\n\n\n\n<p>Educator Ayanda Lima notes that, after participating in Solve for Tomorrow, the school increased visibility in the community and became a leader in STEM research and projects. Students also feel more inspired and excited to participate in experiences like these. \u201cThe school is buzzing. You have no idea how much of an impact the program has had on the city and the state. It\u2019s impossible to describe! In the first week of school, I\u2019d already selected classes to develop projects,\u201d the teacher exclaimed.<\/p>\n\n\n\n<p>According to her, the state secretary of education visited the school to learn about the institution, and all the recognition it has earned gives school administrators greater confidence in understanding the importance of investing in this type of initiative. \u201cI get emotional just talking about it. You know that feeling of a job well done, of knowing it worked out?\u201d she says, her eyes welling up.<\/p>\n\n\n\n<p>While before the program\u2019s results were announced the teacher felt that the local health department wasn\u2019t open to hearing about the class\u2019s findings, she feels that the reception has changed following the interest generated by Solve for Tomorrow: \u201cIt seems they\u2019ve opened the doors a little. I was invited by the State Department of Health to share what we\u2019d done; let\u2019s see what the next steps will be,\u201d she shares. The next step, the educator envisions, is to establish a partnership with the city\u2019s endemic disease control department to install more EDLs.&nbsp;<\/p>\n\n\n\n<p>The change in the students\u2019 behavior was also evident to the teacher. At first, they were very shy, so much so that, on the eve of the <a href=\"https:\/\/solvefortomorrowlatam.com\/en\/entry\/pitch\/\">pitch<\/a>, during the program\u2019s final phase, they were still nervous about giving the presentation. \u201cThe night before, at the hotel, we had to have a talk with them to help them gain that confidence, you know? After the final and once they got past that, it seemed like they came out of their shells,\u201d she jokes. \u201cI saw them walking down the hallways, their eyes shining, radiant, with a whole new attitude. And it\u2019s contagious. One of the girls\u2019 younger sisters, who didn\u2019t seem very interested in this kind of thing, has now come to me wanting to follow in her older sister\u2019s footsteps,\u201d reveals the teacher, she says emotionally.&nbsp;<\/p>\n\n\n\n<p>Lima also highlights how her classes learned the <a href=\"https:\/\/solvefortomorrowlatam.com\/en\/importance-mistakes\/\">importance of making mistakes in STEM projects<\/a> through this experience. \u201cDuring the first week of school this year, my class gave me a letter that still moves me to this day. They said: \u2018We want to study, research, make mistakes, learn, and grow together with you. We want to represent our school with pride and prove that when a teacher believes, an entire classroom can flourish. If science transforms lives, we want to be proof of that,\u2019\u201d she concludes.<\/p>\n\n\n\n<div class=\"banner -blue\">\n    <h5>\n                Tip!    <\/h5>\n    <p><span style=\"font-weight: 400;\">For educators who want to try Project-Based Learning (PBL) for the first time, Ayanda Lima recommends learning from the work of colleagues. \u201cI learned a lot from the modeling technique, by observing what others were doing and how they interacted.\u201d In addition, she notes that demonstrating that you believe in students\u2019 abilities makes a huge difference in the end. \u201cThey\u2019re young, but they know what they want; they\u2019re very smart and capable of making decisions. As teachers, we need to play fair and always communicate with the class,\u201d she concludes.<\/span><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>A high school class turned lessons on dengue into a solution for community problems, creating a low-cost, easy-to-replicate technology<\/p>\n","protected":false},"featured_media":11989,"template":"","tags":[],"eixo_tematico":[209],"area_stem":[210],"ano_projeto":[2485],"posicao_projeto":[228],"pais_projeto":[107],"area_conhecimento":[253,926],"class_list":["post-12004","pratica","type-pratica","status-publish","has-post-thumbnail","hentry","eixo_tematico-saude-en","area_stem-ciencias-en","ano_projeto-2485","posicao_projeto-finalista-en","pais_projeto-brasil-en","area_conhecimento-educacao-ambiental-en","area_conhecimento-quimica-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Student-made natural larvicide for dengue 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