At-home test to measure excess caffeine in drinks

To help prevent serious health problems arising from consuming too much caffeine, scientists, including Indian-origin researchers, have developed a rapid, at-home test to detect even low levels of the stimulant in most beverages and even breast milk.
Mani Subramanian from the University of Iowa and colleagues note that caffeine's popularity as a "pick-me-up" has led to it being added to more than 570 beverages and 150 food products, including gums and jelly beans.
It also comes in a pure powder form that consumers can use themselves to spike drinks and food.
In small amounts, most people can handle caffeine without a problem.

But excessive doses can lead to serious health problems, including insomnia, hallucinations, vitamin deficiency, several types of cancer and in rare cases, death, researchers said.
Subramanian's team, including Sujit K Mohanty and Sridhar Gopishetty and Chi Li Yu, wanted to develop a quick and easy way for consumers to determine whether the caffeine levels in their foods and drinks fall within a safe range.

They tested an enzyme called caffeine dehydrogenase and found that it could detect caffeine in a variety of drinks - with the exception of teas - within one minute.
Also, it was sensitive enough to pick up on caffeine's presence at concentrations as low as 1 to 5 parts per million, the maximum limit the US Food and Drug Administration (FDA) advises for nursing mothers.

They say that their method could be integrated into a dip-stick type of test, like over-the-counter pregnancy tests, that could be used at home.
The research was published in the Journal of Agricultural and Food Chemistry.