A 13-year-old student from the United States is gaining global recognition after transforming discarded peanut shells into an innovative solution aimed at improving food safety. Arika Kundu, a seventh-grade student at Minnetonka Middle School East in Minnesota, has developed LIGNEX, a sustainable technology designed to reduce pesticide residue on fruits and vegetables using agricultural waste.
Her remarkable invention has secured her a place among the finalists of the 2026 3M Young Scientist Challenge, one of the most prestigious science competitions for middle school students in the United States.
Key Highlights
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Arika Kundu developed LIGNEX, a pesticide-removal solution made from peanut shells.
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The innovation uses biosorption technology to absorb harmful contaminants.
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Laboratory tests showed nearly 94% removal of a model contaminant.
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The project earned Arika a place in the 2026 3M Young Scientist Challenge finals.
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She aims to make the technology affordable, sustainable, and accessible worldwide.
Who Is Arika Kundu?
Arika Kundu is a 13-year-old seventh-grade student at Minnetonka Middle School East in Minnesota, United States. Passionate about science and environmental sustainability, she focuses on creating practical solutions to real-world challenges.
Her latest project, LIGNEX, demonstrates how agricultural waste can be repurposed to improve food safety while reducing environmental waste.
What Is LIGNEX?
LIGNEX is an innovative filtration solution that uses processed peanut shells to reduce pesticide residue on fresh fruits and vegetables.
The technology is based on biosorption, a natural process in which biological materials absorb unwanted chemicals from liquids.
Recognizing that peanut shells naturally contain compounds capable of binding to pesticide molecules, Arika enhanced their effectiveness by treating powdered peanut shells with acetic acid, improving their contaminant-absorbing properties.
How Does the Technology Work?
Instead of experimenting with actual pesticides, Arika used methylene blue, a laboratory dye commonly employed as a safe substitute in adsorption studies because it behaves similarly during the absorption process.
She also designed an Arduino-based spectrometer to accurately measure the performance of her invention.
Her experiments demonstrated that the treated peanut shell tablets removed approximately 93.94% of the model contaminant, highlighting the technology's strong potential for reducing pesticide residue from fresh produce.
To make the innovation practical, she compressed the treated peanut shell powder into effervescent tablets, making it suitable for household use, farms, and communities with limited resources.
A Sustainable Approach to Food Safety
One of the most significant aspects of LIGNEX is its focus on sustainability.
By converting discarded peanut shells—an agricultural by-product that often goes to waste—into a useful filtration material, the innovation addresses two important challenges simultaneously:
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Reducing agricultural waste.
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Improving food safety through an affordable solution.
Its simple manufacturing process also makes the technology potentially scalable for wider adoption.
Why Did Arika Enter the 3M Young Scientist Challenge?
According to the 3M Young Scientist Challenge, Arika entered the competition to further refine her innovation and transform it into a product that could benefit people around the world.
She has credited encouragement from judges at regional and state science fairs for inspiring her to seek mentorship from 3M scientists and continue improving her project.
Beyond Food Safety: A Passion for Space Science
Arika's scientific ambitions extend beyond food safety.
She hopes to pursue a career as an astrobiologist specializing in computational biology, focusing on methods to reduce radiation exposure during space travel.
She believes research in this field could contribute not only to future space missions but also to advancements in cancer treatment, agriculture, ageing research, and degenerative disease studies.
About the 3M Young Scientist Challenge
The 3M Young Scientist Challenge, organized by 3M in partnership with Discovery Education, is one of the United States' leading science competitions for students in Grades 5 through 8.
The competition encourages young innovators to apply science, engineering, and creativity to develop practical solutions for real-world problems, with finalists receiving mentorship from experienced scientists to further develop their inventions.
Why This Innovation Matters
As concerns over pesticide residue and food safety continue to grow globally, affordable and environmentally friendly solutions are becoming increasingly important.
Arika Kundu's innovation demonstrates how scientific creativity and sustainable thinking can transform agricultural waste into a practical solution with the potential to benefit households, farmers, and communities worldwide.
While further research and real-world testing will be necessary before commercial adoption, LIGNEX highlights the growing role young innovators can play in addressing global challenges.
Frequently Asked Questions (FAQs)
1. Who is Arika Kundu?
Arika Kundu is a 13-year-old student from Minnesota, USA, and a finalist in the 2026 3M Young Scientist Challenge for developing LIGNEX.
2. What is LIGNEX?
LIGNEX is a sustainable technology that uses treated peanut shells to reduce pesticide residue on fruits and vegetables through biosorption.
3. How effective is Arika Kundu's invention?
Laboratory testing showed the system removed approximately 93.94% of a model contaminant used to simulate pesticide absorption.
4. Why are peanut shells used in the invention?
Peanut shells naturally contain compounds capable of binding with contaminants. Treating them with acetic acid further enhances their adsorption capacity.
5. What is the 3M Young Scientist Challenge?
It is a national science competition in the United States that encourages students in Grades 5–8 to develop innovative solutions to real-world problems through science and engineering.
