Allo-A Sepharose 4B親和層析分離血清糖缺失轉(zhuǎn)鐵蛋白
[Abstract]:OBJECTIVE: To establish an Allo-A Sepharose affinity chromatography method for the separation of Tf and CDT in serum, and to determine the levels of Tf and CDT by direct sandwich ELISA.
Method
1. to establish a direct sandwich ELISA assay for transferrin.
A direct sandwich ELISA for the quantitative determination of Tf and CDT was established by labeling sheep anti-human Tf antibody with anti-human Tf IgG and HRP.
Separation of CDT. by affinity chromatography with 2.Allo-A Sepharose 4B
Allo-A Sepharose 4B affinity chromatography column was prepared with Allo-A and CNBr activated Sepharose 4B for the separation of Tf and CDT in serum.
Separation and determination of Tf and CDT in 3. human blood
The Tf and CDT in the eluent were separated by affinity chromatography and then determined by direct sandwich method.
Result
1. establishment of direct sandwich ELISA for transferrin detection
The optimum dilution of HRP-labelled sheep anti-human Tf antibody was determined to be 1/2000. The concentration of Tf was highly correlated with 450 nm optical density (R~2=0.9845). The coefficient of variation (CV%) of different concentrations of human Tf standard and serum samples was 1.8%-7.52%. The four alcoholic sera were observed and returned to the study. The yield is 96% ~ 105.7%..
Separation of CDT. by affinity chromatography with 2.Allo-A Sepharose 4B
2.1 The coupling experiments of Allo-A and CNBr-activated Sepharose 4B were carried out four times. The coupling rates were 80.6-91.4% and CV=4.9%.
2.2 The affinity chromatogram of CDT Allo-A Sepharose 4B showed that there were two elution peaks, CDT existed in the first elution peak and Tf existed in the second one.
Identification of 2.3 Tf and CDT by isoelectric focusing electrophoresis and immunoblotting showed that the affinity chromatography of Allo-A Sepharose 4B could effectively separate CDT and Tf under the conditions determined in this experiment.
3. There was a linear relationship between Tf and OD450nm in human serum (R~2=0.9917). The average level of CDT in normal subjects was 27.02 ug/ml, the 99% confidence limit was 23.1-30.9 ug/ml, the average level of Tf was 1998.0 ug/ml, the 99% confidence limit was 1606.1-2389.9 ug/ml, and the ratio of CDT to Tf was 1.45%. The average level of Tf was 720.7 ug/ml, which was significantly lower than the normal level. The ratio of CDT to Tf was 5.1%.
conclusion
1. the Tf direct sandwich ELISA method established in this experiment has better sensitivity, precision and reliability.
2. The affinity chromatography technique of Allo-A Sepharose 4B established in this experiment is suitable for the separation of Tf and CDT in serum.
3. By using Allo-A Sepharose 4B affinity chromatography combined with Tf direct central ELISA, the serum CDT levels in 20 normal subjects and 27 patients with alcoholic liver disease were higher than those in normal subjects, while Tf levels were lower than those in normal subjects. It is mainly caused by the decrease of Tf level.
4. According to the observation of normal people and alcoholic liver disease patients, Allo-A Sepharose 4B affinity chromatography combined with Tf sandwich ELISA can be used as a routine detection technique for the diagnosis of alcoholic liver disease.
【學(xué)位授予單位】:天津醫(yī)科大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2007
【分類號(hào)】:R392
【共引文獻(xiàn)】
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