• Title/Summary/Keyword: SPR biosensor

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SPR-based Antibody-Antigen Interaction for Real Time Analysis of Carbamate Pesticide Residues

  • Yang, Gil-Mo;Kang, Suk-Won
    • Food Science and Biotechnology
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    • v.17 no.1
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    • pp.15-19
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    • 2008
  • This research was conducted to develop a quick and sensitive method of detecting carbamate residues using the immobilization of antibody-antigen interactions with surface plasmon resonance (SPR). We have used commercialized surface plasmon resonance equipment (Biacore 3000). The antibody used for the immunoassay was specific for glutathione-s-transferase (GST) and the antigens included several carbamate pesticides (carbofuran, carbaryl, and benfuracarb). When antigens were applied to the protein GST, the detection limit was 2 ng/mL of carbamate pesticide. The fabricated protein GST maintained its activity for over 200 measurements. Thus we determined that the SPR biosensors could detect the specific reversible binding of a reactant in solution to a binding partner immobilized on the surface of the sensor and allow real-time detection and monitoring.

Graphene Coated Optical Fiber SPR Biosensor

  • Kim, Jang Ah;Hwang, Taehyun;Dugasani, Sreekantha Reddy;Kulkarni, Atul;Park, Sung Ha;Kim, Taesung
    • Proceedings of the Korean Vacuum Society Conference
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    • 2014.02a
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    • pp.401-401
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    • 2014
  • In this study, graphene, the most attractive material today, has been applied to the wavelength-modulated surface plasmon resonance (SPR) sensor. The optical fiber sensor technology is the most fascinating topic because of its several benefits. In addition to this, the SPR phenomenon enables the detection of biomaterials to be label-free, highly sensitive, and accurate. Therefore, the optical fiber SPR sensor has powerful advantages to detect biomaterials. Meanwhile, Graphene shows superior mechanical, electrical, and optical characteristics, so that it has tremendous potential to be applied to any applications. Especially, grapheme has tighter confinement plasmon and relatively long propagation distances, so that it can enhance the light-matter interactions (F. H. L. Koppens, et al., Nano Lett., 2011). Accordingly, we coated graphene on the optical fiber probe which we fabricated to compose the wavelength-modulated SPR sensor (Figure 1.). The graphene film was synthesized via thermal chemical vapor deposition (CVD) process. Synthesized graphene was transferred on the core exposed region of fiber optic by lift-off method. Detected analytes were biotinylated double cross-over DNA structure (DXB) and Streptavidin (SA) as the ligand-receptor binding model. The preliminary results showed the SPR signal shifts for the DXB and SA binding rather than the concentration change.

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A fiber optic surface plasmon resonance (SPR) sensorusing cyclic olefin copolymer (COC) polymer prism (Cyclic olefin copolymer (COC) 폴리머 프리즘을 사용한 광섬유 기반 표면 플라즈몬 공명 (SPR) 바이오 센서)

  • Yun, Sung-Sik;Lee, Soo-Hyun;Ahn, Chong-H.;Lee, Jong-Hyun
    • Journal of Sensor Science and Technology
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    • v.17 no.5
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    • pp.369-374
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    • 2008
  • A novel fiber optic surface plasmon resonance (SPR) sensor using cyclic olefin copolymer (COC) prism with the spectral modulation is presented. The SPR sensor chip is fabricated using the SU-8 photolithography, Ni-electroplating and COC injection molding process. The sidewall of the COC prism is partially deposited with Au/Cr (45/2.nm thickness) by e-beam evaporator, and the thermal bonding process is conducted for micro fluidic channels and optical fibers alignment. The SPR spectrum for a phosphate buffered saline (0.1.M PBS, pH.7.2) solution shows a distinctive dip at 1300.nm wavelength, which shifts toward longer wavelength with respect to the bovine serum albumin (BSA)concentrations. The sensitivity of the wavelength shift is $1.16\;nm{\cdot}{\mu}g^{-1}{\cdot}{\mu}l^{-1}$. From the wavelength of SPR dips, the refractive indices (RI) of the BSA solutions can be theoretically calculated using Kretchmann configuration, and the change rate of the RI was found to be $2.3{\times}10^{-5}RI{\cdot}{\mu}g^{-1}{\cdot}l^{-1}$. The realized fiber optic SPR sensor with a COC prism has clearly shown the feasibility of a new disposable, low cost and miniaturized SPR biosensor for biochemical molecular analyses.

Quantitative Assay of Hepatitis B Surface Antigen by Using Surface Plasmon Resonance Biosensor

  • Hwang, Sang-Yoon;Yoo, Chang-Hoon;Jeon, Jun-Yeoung;Choi, Sung-Chul;Lee, Eun-Kyu
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.10 no.4
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    • pp.309-314
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    • 2005
  • We performed a basic experiment for the rapid, on-line, real-time measurement of hepatitis B surface antigen using a surface plasmon resonance biosensor. We immobilized anti­HBsAg (hepatitis B surface antigen) polyclonal antibody, as a ligand, to the dextran layer on a CM5 chip surface that had previously been activated by N-hydroxysuccinimide. A sample solution containing HBsAg was fed through a microfluidic channel, and the reflecting angle change due to the mass increase from the binding was detected. The binding characteristics between HBsAg and its polyclonal antibody followed the typical monolayer adsorption isotherm. When the entire immobilized antibody had interacted, no additional, non-specific binding occurred, suggesting the immunoreaction was very specific. The bound antigen per unit mass of the antibody was independent of the immobilized ligand density. No significant steric hindrance was observed at an immobilization density of approximately $17.6 ng/mm^2$. The relationship between the HBsAg concentration in the sample solution and the antigen bound to the ligand was linear up to ca. $40{\mu}g$/mL. This linearity was much higher than that of the ELISA method. It appeared the anti­gen-antibody binding increased as the immobilized ligand density increased. In summary, this study showed the potential of this SPR biosensor-based method as a rapid, simple and multi­sample on-line assay. Once properly validated, it may serve as a more efficient method for HBsAg quantification for replacing the ELISA.

Quantitative Assay of Recombinant Hepatitis B Surface Antigen by Using Surface Plasmon Resonance Biosensor (Surface plasmon resonance 바이오센서를 이용한 재조합 B형 간염 표면항원의 정량분석)

  • Lee, E. K.;Ahn, S. J.;Yoo, C. H.;Ryu, K.;Jeon, J. Y.;Lee, H. I.;Choi, S. C.;Lee, Y. S.
    • KSBB Journal
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    • v.17 no.1
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    • pp.20-25
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    • 2002
  • We performed a basic experiment for rapid, on-line, real-time measurement of HBsAg by using a surface plasmon resonance biosensor to quantify the recognition and interaction of biomolecules. We immobilized the anti-HBsAg polyclonal antibody to the dextran layer on a CM5 chip surface which was pre-activated by N-hydroxysuccinimide for amine coupling. The binding of the HBsAg to the immobilized antibody was measured by the mass increase detected by the change in the SPR signal. The binding characteristics between HBsAg and its antibody followed typical monolayer adsorption isotherm. When the entire immobilized antibody was interacted, there was no additional, non-specific binding observed, which suggested the biointeraction was very specific as expected and independent of the ligand density. No significant steric hindrance was observed at 17.6 nm/$mm^2$ immobilization density. The relationship between the HBsAg concentration in the sample solution and the antigen bound to the chip surface was linear up to ca. $40\mu\textrm{g}$/mL, which is much wider than that of the ELISA method. It appeared the antigen-antibody binding was increased as the immobilized ligand density increased, but verification is warranted. This study showed the potential of this biosensor-based method as a rapid, simple, multi-sample, on-line assay. Once properly validated, it can serve as a more powerful method for HBsAg quantification replacing the current ELISA method.

Direct Triazine Herbicide Detection Using a Self-Assembled Photosynthetic Reaction Center from Purple Bacterium

  • Nakamura, Chikashi;Hasegawa, Miki;Shimada, Kazumi;Shirai, Makoto;Miyake, Jun
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.5 no.6
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    • pp.413-417
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    • 2000
  • In this study, a direct detection system for triazine derivative herbicides was developed using the photosynthetic reaction center (RC) from the purple bacterium, Rhodobacter sphaeroides, and surface plasmon resonance (SPR) apparatus. The histidine-tagged RCs were immobilized on an SPR gold chip using nickel-nitrilotriacetic acid groups as a binder for one of the triazine herbicide, atrazine. The SPR responses were proportional to the sample concentrations of atrazine in the range 0.1-1 $\mu\textrm{g}$/mL. The sensitivity of the direct detection of atrazine using the RC-assembled sensor chip was higher than that using the antibody-immobilized chip. The other types of herbicides, DCMU or MCPP, were not detected with such high sensitivity. The results indicated the high binding selectivity of the RC complex.

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A System to Recognize Microorganisms Using SPR Biosensor (SPR 바이오센서를 이용한 미생물 인식 시스템)

  • 조용진;김남수
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2003.02a
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    • pp.200-208
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    • 2003
  • 미생물수를 측정하는 가장 정확하고 보편적인 방법은 배양법이다. 그러나 배양법은 많은 시간과 노력이 소요되기 때문에 현장에서 실시간에 준하는 측정법으로 사용하기에는 원천적으로 한계를 가지고 있다. 이러한 한계를 극복하기 위해서는 실시간(real-time) 또는 준실시간(near real-time)으로 미생물을 검출할 수 있는 기술이 요구된다. 표면플라즈몬공명(surface plasmon resonance: SPR)은 생물분자 또는 미생물을 실시간 또는 준실시간으로 검출할 수 있는 센서로서 특이성(specificity)과 정확도(accuracy) 측면에서 일찍이 큰 관심을 받아왔다. 1902년, Wood(1902)는 반사 회절격자를 사용하여 연속광원의 스펙트럼을 관찰한 결과, 회절광 스펙트럼에서 어두운 좁은 밴드를 발견하였으며, Fano(1941)는 이 현상이 surface plasma waves와 관련이 있음을 이론적으로 밝혔다. (중략)

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Surface Plasmon Resonance Based on ZnO Nano-grating Structure (산화아연을 이용한 나노격자 구조의 표면 플라즈몬 공명)

  • Kim, Doo-Gun;Kim, Seon-Hoon;Ki, Hyun-Chul;Kim, Hwe-Jong;Oh, Geum-Yoon;Choi, Young-Wan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.5
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    • pp.922-926
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    • 2010
  • We have investigated the grating coupled surface plasmon resonance (GC-SPR) sensors using ZnO nano-grating structures to enhance the sensitivity of an SPR sensor. The GC-SPR sensors were analyzed using the finite-difference time-domain method. The optimum resonance angles of 49 degrees are obtained in the 150 nm wide grating structure with a period of 300 nm for the ZnO thickness of 30 nm. Then, the ZnO nano-grating patterns were fabricated by using laser interference lithography. The measured resonance angle of nano-grating patterns was around 49 degrees. Here, an enhanced evanescent field is obtained due to the surface plasmon on the edge of the bandgap when the ZnO grating structures are used to excite the surface palsmon.

The Integrated Surface Plasmon Resonance Sensor using Polymer Optical Waveguide (폴리머 광도파로를 이용한 집적형 표면 플라즈몬 공명 센서)

  • Oh, Geum-Yoon;Kim, Doo-Gun;Kim, Hong-Seung;Lee, Tae-Kyeong;Choi, Young-Wan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.3
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    • pp.433-436
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    • 2012
  • We propose a novel micro surface plasmon resonance (SPR) sensor system based on polymer materials. The proposed SPR system consists of the incident medium with polymer waveguide and the gold thin film for sensing area. Using a polymer optical waveguide instead of a prism in SPR sensing system offers miniaturization, low cost, and potable sensing capability. The whole device performance was analyzed using the finite-difference time domain method. The optimum gold thickness in the attenuated total reflection mirror of polymer waveguide is around 50 nm and the resonance angle to generate surface plasmon wave is 68 degrees.

Evaluation of Two Types of Biosensors for Immunoassay of Botulinum Toxin

  • Choi, Ki-Bong;Seo, Won-Jun;Cha, Seung-Hee;Choi, Jung-Do
    • BMB Reports
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    • v.31 no.1
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    • pp.101-105
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    • 1998
  • Immunoassay of botulinum toxin (BTX) B type was investigated using two typed of biosensors: light addressable potentiometric sensor (LAPS) and surface plasmon resonance (SPR) sensor. Urease-tagged and immuno-filtration capture method have been used for LAPS. Tag-free and direct binding real-time detection method have been used for SPR sensor. The detection limit of sandwich assay format with LAPS was 10 ng/ml, which was the lowest among methods tested. SPR has the advantage of being more convenient because tag-free direct binding assay can be used and reaction time was reduced, regardless of low sensitivity. This result shows that sandwich assay format with LAPS can be used as an alternative method of BTX mouse bioassay which is known as the most sensitive method for the detection of BTX.

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