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    Breaking News

    Nanotech-Enhanced Biochip Detects Minute Levels of Disease

    The chip aims to spot cancers, malaria, and viral diseases such as pneumonia early in their progression with a pinprick blood test.

    Nanotech-Enhanced Biochip Detects Minute Levels of Disease
    Bharath Babu Nunna, a recent NJIT Ph.D. graduate, worked to develop a nanotechnology-enhanced biochip to detect cancers, malaria, and viral diseases such as pneumonia early in their progression with a pin prick blood test. Image courtesy of NJIT.
    New Jersey Institute of Technology04.04.19
    The difficulty in spotting minute amounts of disease circulating in the bloodstream has proven a stumbling block in the detection and treatment of cancers that advance stealthily with few symptoms. With a novel electrochemical biosensing device that identifies the tiniest signals these biomarkers emit, a pair of NJIT inventors are hoping to bridge this gap.
     
    Their work in disease detection is an illustration of the power of electrical sensing—and the growing role of engineers—in medical research.
     
    "Ideally, there would be a simple, inexpensive test—performed at a regular patient visit in the absence of specific symptoms—to screen for some of the more silent, deadly cancers," said Bharath Babu Nunna, a recent Ph.D. graduate who worked with Eon Soo Lee, an assistant professor of mechanical engineering, to develop a nanotechnology-enhanced biochip to detect cancers, malaria and viral diseases such as pneumonia early in their progression with a pinprick blood test.
     
    Their device includes a microfluidic channel through which a tiny amount of drawn blood flows past a sensing platform coated with biological agents that bind with targeted biomarkers of disease in body fluids such as blood, tears, and urine—thereby triggering an electrical nanocircuit that signals their presence.
     
    In research recently published in Nano Convergence, Nunna and his co-authors demonstrated the use of gold nanoparticles to enhance the sensor signal response of their device in cancer detection, among other findings.
     
    One of the device's core innovations is the ability to separate blood plasma from whole blood in its microfluidic channels. Blood plasma carries the disease biomarkers and it is, therefore, necessary to separate it to enhance the "signal to noise ratio" in order to achieve a highly accurate test. The standalone device analyzes a blood sample within two minutes with no need for external equipment.
     
    "Our approach detects targeted disease biomolecules at the femto scale concentration, which is smaller than nano and even pico scale and is akin to searching for a planet in a galaxy cluster. Current sensing technology is limited to concentrations a thousand times larger. Using a nanoscale platform allows us to identify these lower levels of disease," Nunna said, adding, "And by separating the plasma from the blood, we are able to concentrate the disease biomarkers."
     
    In another recent paper in BioNanoScience, Nunna, Lee and their co-authors detailed their findings on variations in sensitivity based on microfluidic flow.
     
    Nunna is now a postdoctoral research fellow at Harvard Medical School, where he is expanding his expertise in microfluidic platforms, using them in organ-on-the-chip research conducted with Su Ryon Shin, a principal investigator and instructor in the medical school's Department of Medicine who develops 3D-bioprinted organoids—artificial organs composed of cultured cells within structured hydrogels—for medical experimentation.
     
    "I'm primarily responsible for developing the microfluidic devices that will automate the process of bioprinting 3D organs that will be incorporated on a chip for a number of purposes. I'm tasked, for example, with developing an automated platform for long-term drug efficacy and toxicity analysis to track liver cancer and cardiac biomarkers. I'll be integrating the microfluidic biosensor with the liver cancer- and heart-on-a-chip model for continuous monitoring," he said.
     
    By measuring the biomarker concentrations secreted from drug-injected 3D-bioprinted organs, we can study drug effects on several organs without harming a live patient. Creating artificial organs allows us to experiment freely."
     
    Down the road, he added, the work at Harvard could potentially be applied in regenerative medicine. "The goal is to develop fully functional 3D-bioprinted organoids and clinically relevant 3D tissues to address the issue of donor shortages in transplantation."
     
    Nunna said his research at Harvard Medical School will expand his knowledge of programmable microfluidics and precise electrochemical sensing techniques, which will, in turn, help him advance his biochip technology. The goal is a simple, standard assay for cancer diagnosis that avoids conventional, complex diagnostic steps.
     
    Lee and Nunna have been working with oncologists at Weill Cornell Medicine and Hackensack Medical Center to identify clinical applications. As currently designed, the device would provide both qualitative and quantitative results of cancer antigens in blood samples, providing information on the presence and the severity of the cancer. Their next step, he said, will be to expand the platform to detect multiple diseases using a single blood sample obtained with a pinprick.
     
    "Although healthcare technology is considered to be a fast-evolving technology, there are still many unmet needs that need to be addressed. Diagnosing potentially deadly diseases at the early stages is the key to saving lives and improving patient treatment outcomes," he said, adding, "There is a huge need for healthcare technology, including a universal diagnostic platform that can provide instant results at the physician's office and other point-of-care settings."
     
    Nunna is the co-founder and chief research scientist for Abonics Inc., a startup formed by Lee to commercialize their device. He is named as a co-inventor with Lee on three published biochip patents and six additional patents that are now under review by the U.S. Patent and Trademark Office. Their technology has won financial backing from the National Science Foundation I-Corps program and the New Jersey Health Foundation (NJHF), a not-for-profit corporation that supports top biomedical research and health-related education programs in New Jersey.
     
    "As we know, early detection can improve treatment outcomes for patients significantly," explained George F. Heinrich, M.D., vice chair and CEO of NJHF, in announcing the award. "Currently, doctors rely on diagnostic devices requiring a minimum of four hours of sample preparation through centralized diagnostic centers rather than their local offices."
     
    In 2017, Nunna received the "Best Design in Healthcare Innovations and Point-of-Care Innovations Award" at the Healthcare Innovation and Point-of-Care Technologies conference from the Engineering in Medicine and Biology Society, held at the National Institute of Health headquarters in Bethesda, Md. That same year, the technology received the national innovation award at the TechConnect World Innovation Conference and Expo, an annual gathering of technology transfer offices, companies, and investment firms who meet to identify promising technologies from across the globe.
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