Paul Marks, New Scientist Magazine
The perils of counterfeit drugs go way beyond being ripped off by dubious online pill-pushers. Malaria treatments containing no active ingredients, out-of-date chemotherapy drugs and diabetes medication with lethal levels of compounds that encourage insulin release have all recently been found on sale in legitimate outlets. Now the pharmaceutical industry is trying to fight back by making it easier to spot fakes.
Some key events illustrate the risk these pose. In
What can be done? The WHO coordinates an umbrella body called the
Drug packaging is an obvious avenue for counterfeiters to exploit. Boxes and blister packs are usually easy to copy and the repackaging of drugs is not necessarily illegal. Indeed it is standard practice in the pharmaceutical industry as countries have their own rules on, for example, the quantity of a drug that can be supplied in a pack.
What's really needed, says
The idea is based loosely on technology developed by NanoGuardian's owner, NanoInk, which pioneered a process called Dip Pen Nanolithography. DPN was originally designed to drop biological samples such as individual stem cells into test wells. NanoInk has adapted the technology to create a print head 15 nanometers across at the end of a nanoscale arm steered by an electric field. The tip can incorporate hollows that hold a minuscule volume of a substance to be "printed" onto a surface.
"We are using a lot of what we learned building those nanoscale tools to write on pills, capsules, vial caps and pre-filled syringes," Hart told New Scientist.
Nothing is added chemically to a tablet in the process, he stresses. Instead, they use a nano-imprinter whose precise mode of operation is confidential. First, they use their imprinting pen to create a microscale mar -- perhaps the drug company's logo -- that is visible only using a high-magnification eyeglass, or loupe. "That gives you a very good indication that the drug's authentic," says Hart.
Inside the logo they then imprint a 350-digit nanoscale random number that is changed daily. That number is recorded on the drug-maker's database alongside information on where the batch was made, where it was destined to be sold and the drug's expiration date.
Should investigators find out-of-date drugs on sale, they can send them to NanoGuardian to read the number and trace where that consignment was originally shipped to. The technology, which has been approved by the
NanoGuardian is not alone in trying to apply a benign ID mark to tablets. At
De Smedt is experimenting with cellulose and polystyrene-based fibers. To make them, he takes a solution of the fibers and adds fluoroscein, a fluorescing agent used in medical tests. The solution is then turned into microfibers using a process called electrospinning, where the solution is squirted from a charged syringe tip onto a rotating wheel on which fibers adhere like sticky tape on a roll.
To write barcode-style stripes into these fibers, perhaps encoding information on the type of drug, its source and expiration date, De Smedt illuminates them with laser light at 488 nanometers, a wavelength which locally bleaches the fluoroscein in the fibers, creating dark stripes. The fibers are then cut by laser into 10-micrometer lengths for dropping into the mixture from which the drug will be made.
"You can easily see the pattern of bleached stripes through a simple microscope," De Smedt says. That makes it particularly suitable for the developing world, he adds.
Another authentication method in development uses gadgets that fire near-infrared light at tablets and which then analyze the reflected spectra to ascertain what they contain. With funding from
All, however, realize they're in an arms race to some extent. Hart reckons they have a good 10 years before fakers can copy them. "Counterfeiters are highly resourced, highly intelligent and have picked apart every security measure that's out there," he says. "But we're confident that nano-encryption is as close to being uncopyable as possible."
Smedt is not so confident. "The fact is, every type of anticounterfeiting technology gets counterfeited in the end."
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