Sleman, IDN Times – A group of students from the Faculty of MIPA, Yogyakarta State University (UNY) processing galangal rhizome extract to eradicate the Aedes Aegypti mosquito.
The group of students consisted of Yasinta Dwi Salsabila and Mia Luvita Sari, students of Chemistry Education Study Program, Intan Tri Wahyuni of Biology Education, Intan Damayanti, students of Physics Study Program and Mifta Fajarwati of Chemistry Study Program.
1. So far, the larvae have been exterminated with materials that are harmful to the environment
Yasinta Dwi Salsabila explains the most effective way to break the chain of transmission fever bloody dengue (DHF) is to eradicate Aedes Aegypti mosquito larvae, using larvicides such as Dichloro Diphenyil Trichloroethane (DDT), ethylhexanol, temefos, and various other synthetic compounds that can harm the environment.
“Though these compounds can harm the environment,” he explained.
He and his team finally processed galangal rhizome extract as a bioreductant to eradicate mosquitoes that are environmentally friendly.
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2. These are the benefits found in galangal
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According to Yasinta, galangal is a rhizomatous herb that grows firmly by forming large clumps and reaches three meters in height. The active compounds found in this plant are saponins, terpenoids, phenolics, flavonoids, carbohydrates, alkaloids, glycosides, phytosterols and essential oils.
The flavonoid content of galangal has a concentration value that can kill 50 percent of Aedes aegypti larvae or has an LC value of 50 <50 ppm, which is 29.8 ppm. Vegetable larvicides come from natural ingredients that are toxic to insects but do not have a negative impact on the environment and human health. Natural larvicides can be found in plants that contain active compounds such as cyanide, saponins, tannins, flavonoids, alkaloids, steroids, and essential oils.
“Larvicides themselves can be interpreted as a group of pesticides that can kill immature insects or kill larvae,” he said.
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3. Tool and manufacture of galangal extract
Galangal extract as a mosquito repellent Aedes aegypti. Doc: PR UNY–
Intan Tri Wahyuni explained how to make galangal rhizome extract by peeling and washing the galangal rhizome several times with distilled water. The rhizomes are cleaned, cut into small and thin pieces, then dried in the sun to remove moisture and dried in the oven.
The tools used in this study were basins, trays, knives, scales, 1000 mL measuring cup, 1000 mL beaker, pan, Whattman No. filter paper. 1, 2000 mL beaker, erlenmeyer, glass stirrer, stirrer, oven, 100 mL volumetric flask 5 pieces, spatula, flacon bottle, glass funnel, measuring pipette, ball pipette, analytical balance, dropper pipette, thermometer, PSA, and UV spectrophotometer -Vis. The materials used were galangal rhizome, distilled water, Whatman No.1 filter paper, CuSO₄.5H₂O, and NiCl₂.6H₂O.
“Furthermore, the galangal is mashed using a blender. The dried galangal rhizome is weighed as much as 40 grams and dispersed in 800 ml of sterile distilled water in a 1000 ml beaker,” he explained.
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