Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Antibody Functionalized UiO-66-(COOH)2 Amplified Surface Plasmon Resonance Analysis Method for fM Oxytocin

펨토몰 농도의 옥시토신 검출을 위한 항체 기능성 UiO-66-(COOH)2 증폭형 표면 플라즈몬 공명 분석법 개발

  • Myungseob Lee (Department of Chemistry, Kyungpook National University) ;
  • Ha-Young Nam (Department of Chemistry, Kyungpook National University) ;
  • Su Yeon Park (Department of Chemistry, Kyungpook National University) ;
  • Sung Hwa Jhung (Department of Chemistry, Kyungpook National University) ;
  • Hye Jin Lee (Department of Chemistry, Kyungpook National University)
  • Received : 2024.06.19
  • Accepted : 2024.07.22
  • Published : 2024.08.10
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Abstract

In this paper, we synthesized organic and inorganic hybrid materials to introduce antibody functionality to UIO-66 and incorporated them into a surface plasmon resonance (SPR) assay to enhance the sensitivity of detecting small molecules such as oxytocin. A biological marker peptide called oxytocin may help in the diagnosis of heart failure, Alzheimer's disease, and cancer. To detect oxytocin at concentrations as low as a few femtomole (fM), we developed a surface sandwich assay utilizing a pair of oxytocin-specific antibodies for enhancing selectivity and one of metal organic frameworks [e.g., UiO-66-(COOH)2] possessing high porosity and surface-area as a signal amplifier. Initially, real-time SPR assays were used to confirm that each selected oxytocin-specific antibody binds strongly to oxytocin and to different binding sites on oxytocin. One of these antibodies (e.g., anti-OXT[OTI5G4]) was immobilized on the surface of a thin gold chip. Upon sequential injecting of oxytocin and the other antibody (e.g., anti-OXT[4G11]) conjugated to UiO-66-(COOH)2 onto the surface to form the surface sandwich complex of anti-OXT[OTI5G4]/oxytocin/UiO-66-(COOH)2-anti-OXT[4G11]), SPR changes, which varied with oxytocin concentration, were then measured in real time. The results demonstrated that sensitivity was amplified by over a million-fold compared to assays without UiO-66-(COOH)2, enabling oxytocin detection down to approximately 10 fM.

본 논문에서는 UIO-66에 항체 기능성을 도입한 유무기 하이브리드 소재를 합성하고 이를 표면 플라즈몬 공명(surface plasmon resonance, SPR) 분석법에 접목하여 옥시토신과 같은 작은 분자를 검출하는 감도를 향상시키고자 하였다. 옥시토신은 암, 알츠하이머, 심부전증 진단에 중요한 생물학적 표지 펩타이드 분자로 알려져 있으며, 이를 수 펨토몰(femtomole, fM) 농도 수준까지 검출하기 위해 다공성이며 표면적이 우수한 metal organic frameworks 중 하나인 UiO-66-(COOH)2 소재를 신호증폭용으로 활용하면서 옥시토신에 특이적인 항체 페어를 이용하는 표면 샌드위치 분석법을 개발함으로써 선택성을 향상시키고자 하였다. 이를 위해 먼저 선정한 각 옥시토신 특이적 항체가 옥시토신에 대해 강하게 결합하는지 그리고 각 항체가 옥시토신의 서로 다른 결합사이트에 결합하는지를 실시간 SPR 분석법으로 확인하였다. 선정한 항체 중 한 개(예: anti-OXT [OTI5G4])를 SPR용 금 박막 칩 표면에 고정하고, 옥시토신을 흘려준 후, UiO-66-(COOH)2에 컨쥬게이션된 다른 항체(예: anti-OXT[4G11])를 순차적으로 흘려주어 표면에 샌드위치 복합체(anti-OXT[OTI5G4]/옥시토신/UiO-66-(COOH)2-anti-OXT[4G11])를 형성하였을 때 옥시토신 농도에 따라 SPR 신호가 변화하는 것을 실시간으로 모니터링하였다. 그 결과, UiO-66-(COOH)2를 사용하지 않았을 때 대비 약 백만 배 이상 감도를 증폭시켜 약 10 fM까지 검출 가능함을 보여주었다.

Keywords

Acknowledgement

This Project was supported by the National Research Foundation of Korea (NRF) grant, funded by the Korean government (Ministry of Science and ICT, MSIT) (Grand number: RS-2023-00207831 and RS-2024-00343620).

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