The device uses Nuclear Quadrupole Resonance (NQR) spectroscopy, a non-invasive and non-destructive analytical technique for medicines and supplements in pill or powder form. Mandal's research team proposes what it calls a "chemometric passport approach" for quality assurance.
Data on packaged medicines will be derived from a spectroscopic analysis performed at the point of manufacture. The contents of the packet will later be authenticated by matching the results of another spectroscopic analysis using unique chemical identifiers from a reference spectrum. Authentication information can be accessed either from a secure database stored in the cloud, or from information encoded directly within the product barcode. The absence of a match triggers a "contents don't match the label" alarm on the testing device. Mandal said that capability would be particularly useful at customs checkpoints and postal sorting offices when a barcode might not be visible. "The work builds on -- and improves -- a related project introduced in Europe a few years ago to create a portable, low-cost detector for medicines," he said. Mandal said the detector he and his colleagues are developing is much more flexible (capable of analysing a wide variety of medicines and dietary supplements), and more sensitive or capable of measuring smaller quantities. The findings will be published in the journal IEEE/ACM Transactions on Computational Biology and Bioinformatics.