• Journal of Pharmaceutical Investigation
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• v.24 no.4
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• pp.201-215
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• 1994

Recent development in the immunochemical technique has resulted in a new ultrasensitive analytical method known as liposome immunoassay (LIA). Liposome is a key element in performing liposome immunoassays, specifically designed to participate in immune reactions. A variety of markers can be encapsulated in liposomes and used as quantitative indicators of reactions. Liposome immunoassay based on agglutination, complement-mediated Iysis, cytolysin-mediated Iysis, detergent-mediated Iysis or destabilization of the liposomal membrane have been reviewed. The quantity of markers released from liposomes should be proportional to the concentration of the analytes. Therefore, liposomal agglutination and Iysis which are essential to liposomal Iysis are critically reviewed to provide a better understanding of liposome immunoassay. Based on the literature review of recent advances in liposome immunoassay for bioactive substances, this assay method may provide a convenient, specific and highly sensitive method for detecting and measuring trace amount of clinically relevant substances in the future.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1996.04a
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• pp.281-281
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• 1996

The immunoassay method is frequently used for the identification and quantitation of ultratrace amount of bioactive substances. Homogeneous liposome immunoassays, which can avoid the use of radioisotopes and separation steps, have recently been reported in many publications. Cytolysin-mediated liposome immunoassay using melittin ever been studied but showed limited applications. Here, we designed a homogeneous liposome immunoassay using Clostridium perfringens phospholipase C (PLC), an enzyme which catalyzes the hydrolysis of phosphatidylcholine in biological membranes, as a cytolysin.

• Korean Journal of Pharmacognosy
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• v.17 no.2
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• pp.101-106
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• 1986

For the immunoassay of ginseng sapogenins, the ligands with which panaxadiol and panaxatriol could be determined together and separately were synthesized. For the total assay of panaxadiol and panaxatriol, panaxatriol-6-hemisuccinate was synthesized. For the separate assay, panaxadiol-3-hemisuccinate and panaxatriol-3-hemisuccinate were also synthesized.

• Clinical and Experimental Reproductive Medicine
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• v.17 no.1
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• pp.87-91
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• 1990

Development of a solid-phase chemiluminescence immunoassay for the detection of progesterone in serum extract was described. The chemiluminescence immunoassay was establised utilizing anti-progesterone monoclonal antibody that coated on polystyrene tubes and progesterone-ABEI conjugate as tracer. The light yield generated from antibody bound conjugate was counted on clinilumat luminometer by oxidation with microperoxidase and peroxide. The chemiluminescence immunoassay was high specific and accurate and detects as little as 3.9ng/ml of progesterone. The intra-assay CV ranged from 6% to 11.5% and inter-assay CV ranged from 13.6% to 18.7%. This assay system was good correlated with conventional kit radioimmunoassay system (r=0.98).

• Microbiology and Biotechnology Letters
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• v.17 no.4
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• pp.365-369
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• 1989

Thermal inactivation of Tyichoderma viride cellobiohydrolase was investigated by immunoassay and residual enzyme assay such as carboxymethyl cellulase (CMCase) and filter paper degradation activity (FPase). Arrhenius plots of cellobiohydrolase were appeared as straight line. The Z-values of cellobiohydrolase calculated by CMCase, FPase and immunoassay were 5.2$^{\circ}C$, 6.4$^{\circ}C$ and 5.8$^{\circ}C$, respectively. The thermodynamic parameters obtained from FPase were better agreement with those of immunoassay than CMCase assay.

• BMB Reports
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• v.34 no.1
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• pp.47-50
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• 2001

A one-step, two-site enzyme immunoassay was developed for measuring human alpha-fetoprotein (AFP) in serum and amniotic fluid using monoclonal antibodies (McAb) by eliminating the high-dose hook effect. Three McAbs that recognize different epitopes were selected among 16 different clones on the basis of epitope mapping, two for immobilization and one for horseradish peroxidase conjugation. This one-step immunoassay system is more convenient and rapid compared to a conventional two-step sandwich immunoassay system. It did not exhibit the hook effect to around 2.7 mg/ml of AFP, which is probably one of the highest concentrations of AFP in the serum. The dose-response curve of the system was linear to 500 mg/ml of AFP and the system could differentiate as low as 1 mg/ml of AFP The intra- and inter-assay variations were in an acceptable range; 95~104% and 97~105% respectively Its correlation with other commercial systems was around 95%.

• Korean Journal of Veterinary Research
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• v.28 no.2
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• pp.321-325
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• 1988

This experiment was carried out to determine the progesterone concentration of bovine plasma by liquid phase double antibody enzyme immunoassay. The optimum conditions of assay-system, double (first and second) antibody and carrier (normal rabbit serum) were investigated. The optimum dilution rate of first antibody, second antibody and normal rabbit serum was $10{\times}10^3$ to $15{\times}10^3$, 20 and $1{\times}10^3$ times, respectively.

• Parasites, Hosts and Diseases
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• v.51 no.1
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• pp.129-132
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• 2013

In this study a disperse dye immunoassay method was standardized and evaluated for detection of antibodies against Neospora caninum in cattle. Sera from 150 cattle with a recent history of abortion were collected and tested by commercial ELISA kit and a standardized in-house dye immunoassay system. The positivity rate for the sera used in this study was 34.6% for the disperse dye immunoassay (DDIA) compared to 32% obtained by ELISA kit. This study showed no significant difference between DDIA and ELISA. The results indicated that the DDIA provide an economic, simple, rapid and robust test for detection of N. caninum infection in cattle.

• International Journal of Industrial Entomology and Biomaterials
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• v.6 no.1
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• pp.27-31
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• 2003

Infectious flacherie of silkworm Bombyx mori is caused by B. mori infectious flacherie virus (BmIFV) and causes severe crop loss to sericulturists. In the present study, a colloidal textile dye-based dipstick immunoassay is developed for the detection of infectious flacherie in silkworms. Colloidal textile dye (blue D2R) with Aλ$_{max}$ at 620 nm was sensitised with 500 $\mu\textrm{g}$/ml of purified anti-BmIFV IgG. The dye-antibody reagent detects purified antigen up to 10 ng/ml and BmIFV infection in diseased larval extracts $(up to a dilution of {10^-5})$ and faecal matter extracts $(up to a dilution of {10^-2})$ by forming clear blue dot within 30 min. It was observed to be stable for three months period at $4^{\circ}C$. The efficacy of textile dye-based dipstick immunoassay was on pay with HRP-based dipstick immunoassay and fluorescent antibody test, and better than latex agglutination and ouchterlony tests in the detection of BmIFV The dye-based dipstick immunoassay method provides a simple, sensitive and less expensive test for the detection of BmIFV infection in silkworms.s.

• Bulletin of the Korean Chemical Society
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• v.31 no.5
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• pp.1215-1218
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• 2010

We demonstrate the possible application of the sandwich type surface-enhanced Raman scattering (SERS) immunoassay using antigen-antibody binding for detection of prostate-specific antigen (PSA) in cancer cells. In this sandwich type of SERS immunoassay, to capture antigens onto the immobilized layer of antibodies on the gold substrate we prepared the monolayer of gold nanoparticles on the APTMS-derivatized surface of a glass slide by using the SAM technique. This sandwich type of SERS immunoassay in which antigens on the substrate specifically capture antibodies on a Raman reporter (DSNB coated gold nanoparticles with R6G) could successfully detect PSA at low levels. A strong SERS spectrum of Raman reporter was observed only with a substrate in which PSA is present.