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  • Title: [Development of immunoblot kit for the detection of anti-Toxoplasma antibodies].
    Author: Jiang SF, Zhang SY, Cao L, Pan CE, Wei MX.
    Journal: Zhongguo Ji Sheng Chong Xue Yu Ji Sheng Chong Bing Za Zhi; 2005 Dec 30; 23(6):449-52. PubMed ID: 16566219.
    Abstract:
    OBJECTIVE: To develop a diagnostic kit for the detection of anti-Toxoplasma antibodies in human sera by immunoblot technique. METHODS: The cytoplasm proteins of Toxoplasma gondii were extracted from collected ascites in Kunming strain mice infected by tachyzoites of Toxoplasma gondii (RH strain). Toxoplasma gondii soluble antigens were separated by SDS-PAGE electrophoresis and transferred to pyroxylin membrane. Using nonpoisonous tetramethylbenzidine (TMB) as horseradish peroxidase substrate for immunoblot, the optimal experimental conditions were selected through comparison of antigen preparation, reagents for blocking or washing, dilution concentration, reaction time, and frequencies of reacting band. Sensitivity, specificity, Youden index and stability were evaluated as the standard for the kit. RESULTS: In 30 sera with anti-Toxoplasma [gM antibodies and 28 with IgG antibodies, the sensitivity for IgM and IgG antibody detection was 90.0% (27/30) and 85.7% (24/28) respectively, the specificity was all 100% in examining 40 healthy control sera, and the Youden index was 0.9 and 0.86 respectively. The kit was stable at 49 degrees C for 6 months. CONCLUSION: The immunoblot kit shows an easy operation, fast reaction and reliable result, and may be practical.
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