Edible security tags on pills could fight fake drugs

Researchers are aiming to fight counterfeit drugs with an edible “security tag” they can embed into medicine.

To imitate the drug, a counterfeiter would have to crack a complicated puzzle of patterns not fully visible to the naked eye.

Counterfeit drugs are a thriving business, making up at least 10% of global pharmaceutical commerce while also claiming thousands of lives each year. Manufacturing prescription drugs with distinct markings, colors, shapes, or packaging isn’t enough to protect them from counterfeiting, US Drug Enforcement Administration reports have shown.

Researchers have created a silk film “security tag” to go on the surface of drug capsules. The photo has a green filter for visibility. (Credit: Jung Woo Leem/Purdue)

In the US, counterfeit drugs range from cancer and diabetes treatment to erectile dysfunction medication. Counterfeit opioids have caused deaths in 46 states.

Tagging drugs would not only guard against fakery, but also help pharmacies better verify the legitimacy of a drug before selling to consumers.

“Every single tag is unique, offering a much higher level of security,” says Young Kim, an associate professor in Purdue University’s Weldon School of Biomedical Engineering.

The tag acts as a digital fingerprint for each drug capsule or tablet, using an authentication technique called “physical unclonable functions,” or PUF, that was originally developed for information and hardware security.

PUFs have the ability to generate a different response each time that they are stimulated, rendering them unpredictable and extremely difficult to duplicate. Even the manufacturer wouldn’t be able to recreate an identical PUF tag.

Kim’s group is the first to create an edible PUF—a thin, transparent film made of silk proteins and fluorescent proteins genetically fused together. Because the tag is easily digestible and made entirely of proteins, patients can consume it as part of a pill or tablet.

Shining various LED light sources on the tag excites the fluorescent silk microparticles, causing them to generate a different random pattern each time. The microparticles emit cyan, green, yellow, or red fluorescent colors.

Digital bits can then be extracted from an image of those patterns to produce a security key, which a pharmacy or patient would use to confirm that a drug is authentic.

The researchers are currently converting this process to a smartphone app for both pharmacies and consumers.

“Our concept is to use a smartphone to shine an LED light on the tag and take a picture of it. The app then identifies if the medicine is genuine or fake,” says Jung Woo Leem, a postdoctoral associate in biomedical engineering.

The tag also has the potential to hold much more information than simply a confirmation of what the drug is and whether it’s counterfeit, Leem says, such as the dose and expiration date.

Leem found that the tag works for at least a two-month period without the proteins degrading. Next, the team will need to confirm that the tag could last as long as a drug does and that it doesn’t affect a medicine’s key ingredients or potency.

The work appears in Nature Communications.

The researchers have filed two patent applications for the technology through the Purdue Research Foundation Office of Technology Commercialization. CryptoMED LLC, a new company Young Kim founded, will continue to develop the mobile technology.

The US Air Force Office of Scientific Research supported the work.

Source: Purdue University

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