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基于酶標噬菌體抗體的磁分離免疫分析方法

2014-07-10 21:13:01穆晞惠等
分析化學 2014年6期
關鍵詞:檢測

穆晞惠等

摘 要 [HTSS]以磁微粒偶聯多抗為磁性捕獲探針,酶標噬菌體抗體為特異信號檢測探針,采用“磁性捕獲探針待測物酶標噬菌體抗體探針”的檢測模式,成功建立了一種基于酶標噬菌體抗體的磁分離免疫分析方法。

1 引 言

噬菌體抗體是利用噬菌體展示技術,將編碼抗體分子片段的基因與噬菌體衣殼蛋白基因末端融合,使表達抗體展示在噬菌體顆粒表面,再經抗原抗體特異性結合篩選得到目的噬菌體抗體。該抗體具有產量高、分子量小、穩定性好、親和力高及特異性強等優點

4 結 論

本研究以磁微粒偶聯多抗作為磁性捕獲探針,酶標噬菌體抗體作為特異信號檢測探針,采用“磁性捕獲探針待測物酶標噬菌體抗體探針”的檢測模式,建立了基于酶標噬菌體抗體的磁分離免疫分析方法,以βBGT為檢測目標物,實現了微量βBGT檢測。利用噬菌體表面含有多拷貝的衣殼蛋白與其相應的酶標抗體特異結合特性,酶標噬菌體抗體作為信號檢測探針與傳統抗體酶標二抗結合形成的酶標抗體復合物探針相比,一個噬菌體抗體能結合更多的酶分子,從而產生針對檢測靶分子的特異信號放大效應。

References

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李成文. 現代免疫化學技術. 上海: 上海科學技術出版社, 1990: 79-101

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Magnetic Affinity Immunoassay Based EnzymeLabeled

Phage Displayed Antibody

MU XiHui, TONG ZhaoYang*, HUANG QiBin, LIU Bing, LIU ZhiWei, HAO LanQun, ZHANG JinPing

(Research Institute of Chemical Defence, State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China)

Abstract A new magnetic affinity immunoassay (MAIA) strategy based on enzymelabeled phage displayed antibody was developed. The assay consisted of a sandwich format in which immobilized polyclonal antibody (pcAb) on magnetic microparticle was used for capture probe, and enzymelabeled phage displayed antibody for specific detection probe to increase enzyme amount and enhance detection signal. By the proposed method, βbungarotoxin (βBGT) was successfully detected. A linear relationship between absorbance value and the concentration of βBGT in the range of 0.016-62.5 μg/L was obtained. The linear regression equation was Y=0.641X+1.355 (R=0.9925, n=13, p<0.0001)with a detection limit of 0.016 μg/L. In comparison with the traditional ELISA, this method gave a 10fold better sensitivity in βBGT detection. This strategy also gave a 4fold better sensitivity comparing with the MAIA based on enzyme labeled monoclonal antibody (mcAb). Due to low detection limit, acceptable reproducibility and high specificity, this method holds great promise in toxin trace detection.

Keywords Enzymelabeled phage displayed antibody; Magnetic affinity immunoassay; βBungarotoxin

(Received 4 November 2013; accepted 21 February 2014)

徐志凱. 實用單克隆抗體技術. 西安: 陜西科學技術出版社, 1992: 42-50

17 Le V D, Selvanayagam Z E, Gopalakrishnakone P, Eng K H. Journal of Immunological Methods, 2002, 260(12): 125-136

Magnetic Affinity Immunoassay Based EnzymeLabeled

Phage Displayed Antibody

MU XiHui, TONG ZhaoYang*, HUANG QiBin, LIU Bing, LIU ZhiWei, HAO LanQun, ZHANG JinPing

(Research Institute of Chemical Defence, State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China)

Abstract A new magnetic affinity immunoassay (MAIA) strategy based on enzymelabeled phage displayed antibody was developed. The assay consisted of a sandwich format in which immobilized polyclonal antibody (pcAb) on magnetic microparticle was used for capture probe, and enzymelabeled phage displayed antibody for specific detection probe to increase enzyme amount and enhance detection signal. By the proposed method, βbungarotoxin (βBGT) was successfully detected. A linear relationship between absorbance value and the concentration of βBGT in the range of 0.016-62.5 μg/L was obtained. The linear regression equation was Y=0.641X+1.355 (R=0.9925, n=13, p<0.0001)with a detection limit of 0.016 μg/L. In comparison with the traditional ELISA, this method gave a 10fold better sensitivity in βBGT detection. This strategy also gave a 4fold better sensitivity comparing with the MAIA based on enzyme labeled monoclonal antibody (mcAb). Due to low detection limit, acceptable reproducibility and high specificity, this method holds great promise in toxin trace detection.

Keywords Enzymelabeled phage displayed antibody; Magnetic affinity immunoassay; βBungarotoxin

(Received 4 November 2013; accepted 21 February 2014)

徐志凱. 實用單克隆抗體技術. 西安: 陜西科學技術出版社, 1992: 42-50

17 Le V D, Selvanayagam Z E, Gopalakrishnakone P, Eng K H. Journal of Immunological Methods, 2002, 260(12): 125-136

Magnetic Affinity Immunoassay Based EnzymeLabeled

Phage Displayed Antibody

MU XiHui, TONG ZhaoYang*, HUANG QiBin, LIU Bing, LIU ZhiWei, HAO LanQun, ZHANG JinPing

(Research Institute of Chemical Defence, State Key Laboratory of NBC Protection for Civilian, Beijing 102205, China)

Abstract A new magnetic affinity immunoassay (MAIA) strategy based on enzymelabeled phage displayed antibody was developed. The assay consisted of a sandwich format in which immobilized polyclonal antibody (pcAb) on magnetic microparticle was used for capture probe, and enzymelabeled phage displayed antibody for specific detection probe to increase enzyme amount and enhance detection signal. By the proposed method, βbungarotoxin (βBGT) was successfully detected. A linear relationship between absorbance value and the concentration of βBGT in the range of 0.016-62.5 μg/L was obtained. The linear regression equation was Y=0.641X+1.355 (R=0.9925, n=13, p<0.0001)with a detection limit of 0.016 μg/L. In comparison with the traditional ELISA, this method gave a 10fold better sensitivity in βBGT detection. This strategy also gave a 4fold better sensitivity comparing with the MAIA based on enzyme labeled monoclonal antibody (mcAb). Due to low detection limit, acceptable reproducibility and high specificity, this method holds great promise in toxin trace detection.

Keywords Enzymelabeled phage displayed antibody; Magnetic affinity immunoassay; βBungarotoxin

(Received 4 November 2013; accepted 21 February 2014)

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