• Biotechnology and Bioprocess Engineering:BBE
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• 제4권1호
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• pp.72-77
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• 1999

An antibody containing a genetically engineered lipid group at the N-termunus and a hexahistidinyl tag at the C-terminus (Lpp-scF-His6) was immobilized in an oriented manner on the surface of liposome. Liposomes, consisting of antibody and phosphatidyl-choline, have been prepared and imaged by AFM. For AFM visualization, the resulting liposomes were bound on the surface of mica by two different mechanisms. The histidine tags present in the antibody molecules of the immonuliposome were anchored to the NiCl2 treated mica surface. Alternatively, the immunoliposomes were immunochemically bound on antigen-coated mica surface. Both approaches yielded liposomes which were clearly imaged without damage by AFM in ambient condition.

• Food Science and Biotechnology
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• 제17권1호
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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.

• 한국분말재료학회지
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• 제16권3호
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• pp.180-184
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• 2009

In this paper, the electrochemical non-enzyme immunosensor has been developed for the determination of salmonella antigen, using inverse voltammetry. For the estimation of salmonella antigen concentration, the $Fe_3O_4$ nanoparticles synthesized by microemulsion method were conjugated with salmonella antigen. Then, the immunocomplex between antibody immobilized on the transducer surface and antigen containing a magnetic nanoparticles was formed. From the linear relationship between the reduction peak current of Fe(III) and salmonella antigen concentration, it is suggested that the electrochemical non-enzyme biosensor is applicable to detect salmonella antigen in the concentration range of $10^1-10^5$ CFU/ml.

• Parasites, Hosts and Diseases
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• 제31권1호
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• pp.37-42
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• 1993

질트리코모나스(Trichomonasvqqin is)의 항원성 변이를 관찰하기 위해 원충의 표면 항원 (surface antigen)을 N-hydmwsuccinlmide-biotin(N반5-biotin)으로 표지 하고 표지된 표면 단백질과 토끼의 항혈청으로 면역침전(Immunoprecipitation; IP)시켰으며 sodium dodec낀 sulfate-polyacrylamide gel electrophoresis (SDS-PAGE)와 전기영동이적법을 시 행하였다. 살아있는 원충을 NHS-biotin으로 표지하여 표면 단백질을 분리하고 이를 질트리코모나스에 면역된 토끼 항혈청과 면역침전 시켰던 바 46, 60, 68, 90, 130 그리고 220 kDa에서 6개의 단백질이 항원성을 나타내었으며 질토리코모나스의 분리주인 HY-1, HV-15 및 ATCC 50148 주간에 차이는 없어 이들 6개 분획이 표면 항원성 발현에 중요한 역할을 할 것으로 생각된다.

• 미생물학회지
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• 제54권3호
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• pp.222-227
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• 2018

CD1 분자는 결핵균 유래 지질항원 발현하는 단백질이며, 특히 수지상세포(dendritic cells)가 결핵균 감염시에 발현이 점차 감소함을 관찰하였다. 이는 결핵균의 사균이나 항원만으로는 관찰되지 않는 결과였다. 2차원 전기영동(2D electrophoresis)을 통하여 CD1b 의 인산화를 관찰하였고 이러한 현상이 식세포작용과 연관됨을 확인하였다.

• KSBB Journal
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• 제17권1호
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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.

• Journal of Microbiology and Biotechnology
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• 제25권2호
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• pp.206-216
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• 2015

To clarify the role of surface protective antigen A (SpaA) in the pathogenesis of Erysipelothrix rhusiopathiae C43065 (serotype 2), the spaA deletion mutant of E. rhusiopathiae ${\Delta}spaA$ was constructed by homologous recombination. The virulence of the ${\Delta}spaA$ mutant decreased more than 76-fold compared with that of the wild-type strain C43065 in mice. The mutant strain was sensitive to the bactericidal action of swine serum, whereas the wild-type strain was resistant. The adhesion of wild-type strain to MEF cells was inhibited significantly by treatment with rabbit antiserum against recombinant SpaA (rSpaA) as compared with the treatment with normal rabbit serum, but the mutant strain was not affected. The mutant strain was readily taken up by mouse peritoneal macrophages in the normal rabbit serum, whereas the wild-type strain was resistant. Whereas the rabbit antiserum against rSpaA promoted the phagocytosis of wild-type strain by macrophages, the mutant strain was not affected. In addition, mice vaccinated with the formalin-killed mutant strain were provided 40% protection against challenge by the homologous virulent strain as compared with those with wild-type strain, NaOH-extracted antigen, or rSpaA, which provided more than 80% protection against the same infection. These suggested that SpaA has an important role in the pathogenesis of E. rhusiopathiae infection and could be a target for vaccination against swine erysipelas.

• 대한바이러스학회지
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• 제27권2호
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• pp.129-135
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• 1997

Serum samples from 123 males and 123 females collected by age in 1996 were analyzed for antibodies against surface antigen of Hepatitis B virus and C22-3, C200 antigens of Hepatitis C virus. Sera from the children under the age of 10 showed 30% seropositivity to the surface antigen of Hepatitis B virus, 33.3% in $10{\sim}19$ year group, 20% in $20{\sim}29$ year group, 17.6% in $30{\sim}39$ year group, 3.3% in $40{\sim}49$ year group, 5.9% in $50{\sim}59$ year group, 8,3% in $60{\sim}69$ year group, 2.9% in $70{\sim}79$ year group, but antibody could not found in $80{\sim}86$ year group. 12 out of 123 male sera were positive, 19 out of 123 female sera were positive and overall rate of positivity of antibody against surface antigen of Hepatitis B virus was 12.6%. Serum samples from peoples under the age of 30 had not antibody against C22-3, C200 antigens of Hepatitis C virus. The positivity rate was 2.9% in $30{\sim}39$ year group. 5 out of 30 sera from $40{\sim}49$ year age group were positive, and 3 positive sera showed extremely high titer (1:524,288) but the titers of two remaining sera were 1:32, 1:8,192 respectively. 5.9% was positive in $50{\sim}59$ year group, 8.3% in $60{\sim}69$ year group, 11.8% in $70{\sim}79$ year group but all negative in $80{\sim}86$ year group 6 out of 123 male sera were positive (4.9%), 9 out of 123 female sera were positive (7.3%). Overall rate of positivity of antibody against C22-3, C200 antigen of Hepatitis C virus was 6.1 %. None out of 246 sera had both antibodies against Hepatitis B virus and Hepatitis C virus.

• Laboratory Medicine and Quality Assurance
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• 제40권2호
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• pp.51-69
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• 2018

대한임상검사정도관리협회 면역혈청프로그램의 2016년 간염바이러스 항원항체검사 신빙도조사 사업은 6월과 10월에, 2017년 신빙도조사사업은 5월과 10월에 2회에 걸쳐 시행되었다. 간염바이러스 항원항체검사 신빙도조사사업은 총 10종목에 대하여 실시하였다. 저자들은 2016년 1회차 2개, 2회차 3개의 혼합혈청 검체를 각각 965기관, 962기관에 발송하였다. 참여기관은 1회차에 915 기관(94.8%), 2회차 913기관(95.0%)이었다. 2017년도에는 매 회차 3개의 혼주혈청 검체를 각각 936기관, 1,015기관에 발송하였다. 참여기관은 1회차에 920기관(98.3%), 2회차 996기관(98.1%) 이었다. Hepatitis B surface antigen에 가장 많은 기관이 참여하였고, hepatitis B surface antigen, anti-hepatitis C virus, hepatitis B envelope antigen, antibodies to hepatitis B envelope antigen, anti-hepatitis A virus 및 antibodies to hepatitis B core antigen 순으로 참여하였다. 간염바이러스 항원항체검사 신빙도조사 결과, matrix effect로 인하여 전기화학발광면역검사법을 포함한 화학발광면역검사법에서 위양성 결과가 발생하였다. Anti-hepatitis A virus검사에서 면역크로마토그래피법의 낮은 민감도는 위음성 결과를 초래하였다. 검사실의 간염바이러스 신빙도조사사업의 지속적인 참여를 통한 검사의 질 향상이 필요할 것으로 생각되었다.

• 센서학회지
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• 제25권4호
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• pp.243-246
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• 2016

The characteristics of a bimetallic surface plasmon resonance (SPR) chip were investigated to detect a tumor biomarker, carcinoembryonic antigen (CEA). The linewidth and the tangential slope of the reflectance curve of the bimetallic SPR chip was compared with those of the reflectance curve of a conventional gold (Au) SPR chip. The changes in reflectance in response to the variation in CEA in the critical concentration range were analyzed at an angle where the tangential slope of the reflectance curve was maximum. From linear regression analysis, the sensitivity of the bimetallic SPR chip with respect to the CEA in critical concentration was obtained.