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“They’re using things like vitamin C serums, salicylic acid, really expensive products that have actives that can actually harm their skin,” Cheng said, referring to active ingredients meant to address specific conditions such as wrinkles and dark spots.

For the new study, the researchers used this approach to develop a sensor that can detect salicylic acid, a molecule that is involved in regulating many aspects of plant growth, development, and response to stress.

In this study, the researchers applied the sensors for hydrogen peroxide and salicylic acid to pak choi, a leafy green vegetable also known as bok choy or Chinese cabbage.

Heat, light, and bacterial infection all provoked salicylic acid production within two hours of the stimulus, but at distinct time points.

Insect bites did not stimulate salicylic acid production at all.