Krone Advances to State Science Fair


8th grader Liesl Krone presents her research.

Restek is pleased to congratulate Liesl Krone, an 8th grader at Acton Middle School in Granbury Texas, whose science fair project recently advanced to state-level competition. Her project entitled “What Pesticides Have You Eaten Today” will be presented at the ExxonMobil Texas Science and Engineering Fair in San Antonio, Texas.

Liesl became interested in food safety after hearing news reports on food quality issues. She loves fruit and wondered if she was consuming pesticides along with beneficial nutrients. To answer that question, Liesl tested the pesticide residue concentrations of a variety of organic and conventionally grown fruits. Liesl’s experiment paired a QuEChERS sample extraction procedure with LC-MS/MS analysis.

One of the most interesting things Liesl discovered was that while peeling fruits reduced pesticide levels, it did not eliminate them completely. She also found that it is possible to consume fruit in the U.S. that contains pesticides that are not registered for use in this country when she detected Fenpryoximate in imported grapes. She concluded that, while fruit is still a better choice than junk food, research like this plays a valuable role in helping people understand exactly what is going into their bodies.

This project was made possible by instrument time at Analytical Food Labs in Grapevine, Texas; Q-sep™ QuEChERS products from Restek; and scientific input from André Schreiber at AB SCIEX.

Congratulations, Liesl, and good luck at the state competition!