Human lactoferrin monoclonal antibody pair
A monoclonal antibody and human lactoferrin technology, which is applied in the direction of anti-animal/human immunoglobulin, material inspection products, measuring devices, etc., can solve the problem of low sensitivity and specificity, which cannot meet the detection of human lactoferrin Requirements, poor matching, etc., to achieve high sensitivity and specificity
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Embodiment 1
[0037] This example is used to illustrate the screening of human lactoferrin monoclonal antibody pairs.
[0038] The protein sequence of human lactoferrin (hLF) is shown in NCBIGenbank sequence number: U95626. According to the method in the literature (Penghua Yang, et al., Cattle Mammary Bioreactor Generated ya Novel Procedure of Transgenic Cloning for Large-Scale Production of Functional HumanLactoferrin., PLoSONE, 2008, 3(10), e3453), human lactoferrin (hLF) transgenic cows were obtained.
[0039] Intramuscular injection of prolactin needles (purchased from Xi'an Caotan Pharmaceutical Factory, the infertile cow lactation needles, the product is boxed, 10 No. I needles, 3 No. II needles) to transgenic dairy cows for lactation, of which No. I needles were injected intramuscularly continuously 10 days, once a day. One No. II needle was injected on the 13th, 15th, and 17th days respectively. From the 7th day of injection, the udders of the transgenic cows were massaged with w...
Embodiment 2
[0048] This example is used to illustrate the sensitivity and specificity of the monoclonal antibody of the present invention to the prepared immune colloidal gold test paper (ie, the immune colloidal gold test paper screened in Example 1) when testing actual samples.
[0049] (1) Sample preparation: collected milk, dissolved milk powder and liquid dairy products. Take about 200 μl of milk sample into the sample tube.
[0050] (2) Detection: Take out the immunocolloidal gold test strips screened in Example 1, equilibrate at room temperature for 20 minutes, open the package and take out the test strips, insert the test strips into the sample tube in the direction of the arrow, and let stand for 10-15 minutes ,judgement result.
[0051] (3) Judgment of results: At that time, there was a purple-red quality control line visible to the naked eye on the paper strip, but no visible purple-red detection line, it was judged as negative, and recorded as "-"; Control line, if there is ...
Embodiment 3
[0059] 140 milks known to be negative for human lactoferrin were collected (including 100 non-transgenic cows collected from a dairy farm in Dachang, Hebei, 20 transgenic cows with human lysozyme in a dairy farm at China Agricultural University and 20 human α-lactalbumin transgenic cows located in the dairy farm of China Agricultural University), and 22 known positive human lactoferrin milk (collected from the dairy farm located in China Agricultural University, transgenic human lactoferrin Gene cows), 162 samples in total, carried out blind test with the immune colloidal gold test paper obtained by screening in Example 1, and the measurement results showed that 140 known human lactoferrin-negative milks were all shown as negative for detection, and 22 known human lactoferrin Positive milk was all shown as positive for the test, and the diagnostic specificity of the test strip was 100%. Some of the results of the measurements can be seen in Figure 4 and Figure 5 shown.
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