• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1698-1699
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• 2011

본 연구는 압전 마이크로캔틸레버 및 생체물질 리셉터를 이용한 인공 후각 장치에 대한 연구이다. 기존의 인공 후각 장치는 폴리머 리셉터를 이용하여 선택적인 감별이 어려웠으나, 본 연구에서 적용된 펩타이드 바이오폴리머 리셉터의 적용을 통해 DNT가스에만 선택적으로 결합하는 후각센서의 개발이 가능하였으며, 이를 통해 인공후각 시스템의 응용가능성에 대해 논하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.677-679
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• 2014

생명현상은 기능적 요소인 단백질의 활성에 의해 유지되고 조절된다. 최근 단백질의 복잡한 네트워크 정보가 생명현상을 조절하는 기능적 단위로 인식되면서 단백질 네트워크의 최소 단위인 단백질-단백질 상호작용 정보의 중요성이 강조되고 있다. 특히 단백질의약품의 경우 단백질 네트워크 상에서 리셉터 단백질과 리간드 단백질 사이의 상호작용에 의해서 약효가 나타나도록 설계되기 때문에 상호작용에 관여하는 인터페이스 정보의 확보가 필수적이다. 단백질-단백질 상호작용 인터페이스 확인을 위한 연구들이 활발히 이루어지고 있으나 인터페이스 정보의 가시화에 대한 연구는 극히 제한적이다. 본 논문에서는 리셉터 단백질과 리간드 단백질에 대한 3차구조 분석을 통해 단백질-단백질 상호작용에 관여하는 인터페이스 정보를 가시화하였다. 기존의 단백질 3차구조 정보 서비스 사이트인 PDB에서 확인할 수 없는 인터페이스 정보를 3차원으로 시각화하여 인터페이스 상에 위치하는 아미노산 정보를 새롭게 제공함으로써 의약품 연구자들이 단백질 구조와 인터페이스 구조를 쉽게 파악할 수 있도록 하였다. 이는 의약품 등 단백질-단백질 상호작용 정보를 활용하는 바이오 산업 분야에 필요한 정보를 제공함으로써 산업 활성화에 기여할 것으로 기대된다.

• Journal of the Korean Society of Visualization
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• v.20 no.3
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• pp.136-145
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• 2022

Later flow immunoassay (LFIA) is a protein analytical method based on immunoreaction. On the LFIA based protein analytical method, bioreceptor molecule plays a key role, and so a system that evaluates and manages the binding affinity of bioreceptor is needed to secure detection reliability. In this study, Lateral Flow Immunoassay based rapid Bioreceptor Screening Method (rBSM) is presented that provide a simple and quick evaluating method for the binding affinity to the target protein of the antibody as model bioreceptor. To verify this evaluation method, Virus-like particles (VLP) and anti-VLP antibodies are selected as a model norovirus, which is target protein, and the candidate bioreceptors respectively. Among the 5 different candidate antibodies, appropriate antibody could be sorted out within 30 minutes through rBSM. In addition, selected antibodies were applied to two representative LFIA based techniques, sandwich assay and competitive assay. Among these methods, sandwich assay showed more effective VLP detection method. Through applying selected antibodies and techniques to the commercialized mass production lines, an VLP detecting LFIA kit was developed with a detection limit of 10¹² copies/g of VLPs in real samples. Since this proposed method in this study could be easily transformable into other combinations with bioreceptors, it is expected that this technique would be applied to LFIA kit development system and bioreceptor quality management.

• KSBB Journal
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• v.22 no.6
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• pp.378-386
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• 2007

Bio-sensing devices, which are basically integrated and miniaturized assay systems consisted of bioreceptor and signal transducer, are advantageous in several ways. In addition to their high sensitivity, selectivity, simplicity, multi-detection capability, and real time detection abilities, they are both very small and require relatively inexpensive equipments. Two core technologies are required to develop bio-sensing devices; the fabrication of biological receptor module (both of receptor development and immobilisation of them) and the development of signal transducing instruments containing signal generation technique. Various biological receptors, such as enzymes, DNA/RNA, protein, and cell were tried to develop bio-sensing devices. And, the signal transducing instruments have also been extensively studied, especially with regard to electrochemical, optical, and mass sensitive transducers. This article addresses bio-sensing devices that have been developed in the past few years, and also discusses possible future major trends in these devices.

• Applied Chemistry for Engineering
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• v.32 no.4
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• pp.461-466
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• 2021

In this article, a portable and cost-effective voltammetric biosensor with nanoparticles was developed for the measurements of heterogeneous nuclear ribonucleoprotein A1 protein (hnRNP A1) biomarker which can potentially be used for lung cancer diagnosis. Gold nanoparticles were first electrodeposited onto screen printed carbon electrode (SPCE) followed by immobilizing a single stranded DNA aptamer specific to hnRNP A1 onto the electrode surface. Ethanolamine was also used when immobilizing DNA aptamer on the surface to prevent signals from non-specific adsorption events. Sequential injection of hnRNP A1 biomarker and anti-hnRNP A1 conjugated with alkaline phosphatase (ALP) onto the aptamer chip surface allows to form the sandwich complex of DNA aptamer/hnRNP A1/ALP-anti-hnRNP A1 on the electrode surface which further reacted with 4-aminophenyl phosphate (APP). The electrocatalytic reaction of the enzyme, ALP, and the substrate, APP, resulting in the oxidative current response changes at -0.05 and -0.17 V (vs. Ag/AgCl) against the hnRNP A1 concentration was measured using cyclic and differential pulse voltammetry, respectively. The Au nanoparticles-integrated voltammetric biosensor was applied to analyze human normal serum solutions possibly suggesting potential applicability for lung cancer diagnosis.

• Applied Chemistry for Engineering
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• v.33 no.2
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• pp.173-178
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• 2022

A lateral flow immunoassay (LFIA) method using carbon nanodot@silica as a signaling material was developed for analyzing the concentration of retinol-binding protein 4 (RBP4), one of the lung cancer biomarkers. Instead of antibodies mainly used as bioreceptors in nitrocellulose membranes in LFIA for protein detection, aptamers that are more economical, easy to store for a long time, and have strong affinities toward specific target proteins were used. A 5' terminal of biotin-modified aptamer specific to RBP4 was first reacted with neutravidin followed by spraying the mixture on the membrane in order to immobilize the aptamer in a porous membrane by the strong binding affinity between biotin and neutravidin. Carbon nanodot@silica nanoparticles with blue fluorescent signal covalently conjugated to the RBP4 antibody, and RBP4 were injected in a lateral flow manner on to the surface bound aptamer to form a sandwich complex. Surfactant concentrations, ionic strength, and additional blocking reagents were added to the running buffer solution to optimize the fluorescent signal off from the sandwich complex which was correlated to the concentration of RBP4. A 10 mM Tris (pH 7.4) running buffer containing 150 mM NaCl and 0.05% Tween-20 with 0.6 M ethanolamine as a blocking agent showed the optimum assay condition for carbon nanodot@silica-based LFIA. The results indicate that an aptamer, more economical and easier to store for a long time can be used as an alternative immobilizing probe for antibody in a LFIA device which can be used as a point-of-care diagnosis kit for lung cancer diseases.