KSBB Journal

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
권호 표지

Fabrication of Label-Free Biochips Based on Localized Surface Plasmon Resonance (LSPR) and Its Application to Biosensors

국소 표면 플라즈몬 공명 (LSPR) 기반 비표지 바이오칩 제작 및 바이오센서로의 응용

  • Kim, Do-Kyun (BioProcess Engineering Research Center, Center for Systems & Synthetic Biotechnology, Institute for the BioCentury, and Center for Ultramicrochemical Process Systems) ;
  • Park, Tae-Jung (BioProcess Engineering Research Center, Center for Systems & Synthetic Biotechnology, Institute for the BioCentury, and Center for Ultramicrochemical Process Systems) ;
  • Lee, Sang-Yup (Department of Chemical & Biomolecular Engineering, Department of Bio & Brain Engineering, Department of Biological Sciences, Bioinformatics Research Center, KAIST)
  • 김도균 (한국과학기술원 생물공정연구센터, 시스템 및 합성생명공학연구센터, 바이오융합연구소, 초미세화학공정연구센터) ;
  • 박태정 (한국과학기술원 생물공정연구센터, 시스템 및 합성생명공학연구센터, 바이오융합연구소, 초미세화학공정연구센터) ;
  • 이상엽 (생명화학공학과 (BK21 프로그램), 바이오 및 뇌공학과, 생명과학과, 생물정보연구센터)
  • Published : 2009.02.28
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Abstract

In the past decade, we have observed rapid advances in the development of biochips in many fields including medical and environmental monitoring. Biochip experiments involve immobilizing a ligand on a solid substrate surface, and monitoring its interaction with an analyte in a sample solution. Metal nanoparticles can display extinction bands on their surfaces. These charge density oscillations are simply known as the localized surface plasmon resonance (LSPR). The high sensitivity of LSPR has been utilized to design biochips for the label-free detection of biomolecular interactions with various ligands. LSPR-based optical biochips and biosensors are easy to fabricate, and the apparatus cost for the evaluation of optical characteristics is lower than that for the conventional surface plasmon resonance apparatus. Furthermore, the operation procedure has become more convenient as it does not require labeling procedure. In this paper, we review the recent advances in LSPR research and also describe the LSPR-based optical biosensor constructed with a core-shell dielectric nanoparticle biochip for its application to label-free biomolecular detections such as antigen-antibody interaction.

현재까지 연구 개발된 바이오칩 및 센서의 경우에는 생체분자 상호작용의 분석을 수행하기 위해서 효소나 형광 물질 등과 같은 표지물질을 생체분자에 주입할 필요성이 있었다. 이러한 표지작업은 단백질 등과 같이 고차구조를 형성하는 생체분자에 있어서 그 분자인식능을 저하시키는 문제가 발생하게 된다. 그리고 표지작업은 일련의 조작이 필요하기 때문에 조작의 복잡성을 띄게 되고, 간편성을 저해하는 문제가 발생하게 되며, 분석 결과를 얻기 위해서는 장시간을 필요로 하게 된다. 또한, 생체분자 상호작용의 분석에 적용되는 측정장치도 대형화하게 되어 온사이트 모니터링에 이용하기 어렵다. 이러한 문제점들을 해결하기 위해서 비표지로 생체분자의 상호작용 분석이 가능한 SPR 광학특성, QCM 및 전기화학법 등을 이용한 비표지 바이오칩 및 센서가 개발되었다. 하지만 표지 바이오칩 및 센서와 마찬가지로 장치의 대형화 및 복잡화, 간편성 및 감도 등에 문제가 있었다. 따라서 지금까지 개발되어진 표지 및 비표지 바이오칩의 문제들을 해결하기 위해서 나노구조에서만 발현되는 새로운 광학특성인 LSPR을 기반으로 하는 새로운 형태의 코어-쉘 구조 나노입자 바이오칩이 제작되었다. 코어-쉘 나노입자 바이오칩의 표면에 수직방향으로부터 입사광을 조사하고 바이오칩 표면으로부터 반사된 반사광을 검출기로 검출하여 흡수 스펙트럼을 소형의 분광기로 해석함으로서 코어-쉘 나노입자 바이오칩 기반 비표지 광학 바이오센서를 완성하였다. 또한 단백질 항원-항체 반응에 대한 비표지 검출 및 정량특성을 평가한 결과, 감도, 간편성, 유연성, 폭넓은 응용성 등에 양호한 특성을 확인할 수 있었다. 이상에서 살펴본 바와 같이, 코어-쉘 나노입자 바이오칩 기반 비표지 광학 바이오센서는 생체분자 상호작용의 분석에 많이 이용되고 있는 단백질, DNA, 세포 등의 생체분자에 유연하게 대처할 수 있을 것으로 생각되어지며, 그 밖에 의료, 식품분석, 환경 및 공정 모니터링 등 분야에 폭넓게 이용될 것으로 기대되고 있다. 또한 본 코어-쉘 나노입자 바이오칩 기반 비표지 광학 바이오센서는 소형으로 저렴한 분광기를 이용하여 측정을 실시하고 있기 때문에 온사이트 모니터링에의 적용도 가능할 것으로 생각된다.

Keywords

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