iPhones have already been used for an impressive number of medical applications. We’ve seen them used to screen for skin cancer, manage diabetes, prevent blindness, provide eye examinations and diagnose everything from sleep apnea to bipolar episodes. But the next step could be a $250 organic chemistry lab we can carry in our pocket.

The WSJ has been talking to a couple of startups working in this field, including 6SensorLabs which has a device that can – with the help of a smartphone – detect whether a food really is gluten-free.

The Nima from 6SensorLabs is an organic-chemistry lab small enough to carry in your pocket. Right now it is only good for one thing: detecting gluten in foods at minuscule concentrations, as little as 20 parts per million, the FDA’s threshold for declaring a food “gluten-free.”

The company says that this could be just the start, with future versions able to detect the bacteria that cause food poisoning …

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