May 18, 2021 — When chemistry graduate student Abby Gatmaitan first visited the University of Texas at Austin on a recruiting tour, she learned about the MasSpec Pen—a handheld device that scientists there were developing to diagnose tumors on contact. “I knew that was where I wanted to do my research,” she says. Shortly after joining the lab, she realized that if the pen could categorize human tissue, it would probably also work on other animals.
Gatmaitan had a very specific problem in mind, and her hunch paid off. Her research, published this spring in the Journal of Agricultural and Food Chemistry, showed that touching the tip of the “pen” to a sample of raw meat or fish could correctly identify the species it came from. The device was tested on five samples and took less than 15 seconds for each of them. Roughly the length of a typical ink pen, the tool provided answers about 720 times faster than a leading meat-evaluating technique called polymerase chain reaction (PCR) testing—and it was much easier to use. Gatmaitan says it could help scientists tackle a global conservation issue: mislabeled seafood.
Seafood fraud is not just a concern for the restaurant diner who orders expensive, wild-caught red snapper, only to wind up with a plate of mercury-laden tilefish. Such deception also threatens the environment. Mislabeled fishes often come from poorly managed fisheries that can harm local ecosystems. Sometimes a fish is passed off as the wrong species or is falsely claimed to have been caught in a different geographical area in order to evade conservation laws or sell a catch for more money than its market value.