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Marriage of Microfluidics, Optics Could Advance Lab-on-a-Chip Devices

Scalable and reusable optical detection system boasts the sensitivity of a large microscope in a much smaller, cheaper package.

redOrbit
Thu, 02/18/2010 - 06:00
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With a silicone rubber “stick on” sheet containing dozens of miniature, powerful lenses, engineers at Harvard are one step closer to putting the capacity of a large laboratory into a microsized package.

The marriage of high-performance optics with microfluidics could prove the perfect match for making lab-on-a-chip technologies more practical.

Microfluidics, the ability to manipulate tiny volumes of liquid, is at the heart of many lab-on-a-chip devices. Such platforms can automatically mix and filter chemicals, making them ideal for disease detection and environmental sensing.

The performance of these devices, however, is typically inferior to larger scale laboratory equipment. While lab-on-a-chip systems can deliver and manipulate millions of liquid drops, there is not an equally scalable and efficient way to detect the activity, such as biological reactions, within the drops.

The Harvard team’s zone-plate array optical detection system, described in an article appearing in Lab on a Chip (Issue 5, 2010), may offer a solution. The array, which integrates directly into a parallel microfluidic device, can analyze nearly 200,000 droplets per second, is scalable and reusable, and can be readily customized.

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