Other Publications (1)
Articles by Sunmin Ahn in JoVE
Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS) Carlos A. Lopez1, George G. Daaboul2, Sunmin Ahn2, Alexander P. Reddington1, Margo R. Monroe2, Xirui Zhang2, Rostem J. Irani3, Chunxiao Yu4,5, Caroline A. Genco4,5, Marina Cretich6, Marcella Chiari6, Bennett B. Goldberg1, John H. Connor5, M. Selim Ünlü1,2 1Department of Electrical and Computer Engineering, Boston University, 2Department of Biomedical Engineering, Boston University, 3Center for Advanced Genomics Technology, Boston University, 4Department of Medicine, Section of Infectious Diseases, Boston University School of Medicine, 5Department of Microbiology, Boston University School of Medicine, 6CNR (National Research Council), Istituto di Chimica del Riconoscimento Molecolare Quantitative, high-throughput, real-time, and label-free biomolecular detection (DNA, protein, etc.) on SiO2 surfaces can be achieved using a simple interferometric technique which relies on LED illumination, minimal optical components, and a camera. The Interferometric Reflectance Imaging Sensor (IRIS) is inexpensive, simple to use, and amenable to microarray formats.
Other articles by Sunmin Ahn on PubMed
Label-free Microarray Imaging for Direct Detection of DNA Hybridization and Single-nucleotide Mismatches Biosensors & Bioelectronics. Mar, 2010 | Pubmed ID: 20097056 A novel method is proposed for direct detection of DNA hybridization on microarrays. Optical interferometry is used for label-free sensing of biomolecular accumulation on glass surfaces, enabling dynamic detection of interactions. Capabilities of the presented method are demonstrated by high-throughput sensing of solid-phase hybridization of oligonucleotides. Hybridization of surface immobilized probes with 20 base pair-long target oligonucleotides was detected by comparing the label-free microarray images taken before and after hybridization. Through dynamic data acquisition during denaturation by washing the sample with low ionic concentration buffer, melting of duplexes with a single-nucleotide mismatch was distinguished from perfectly matching duplexes with high confidence interval (>97%). The presented technique is simple, robust, and accurate, and eliminates the need of using labels or secondary reagents to monitor the oligonucleotide hybridization.