發展微珠式96孔過濾盤競爭型免疫分析法偵測硫酸紫菌素

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姓名

何天瑜(Tien Yu Jessica) 查詢紙本館藏

畢業系所

系統生物與生物資訊研究所

論文名稱

發展微珠式96孔過濾盤競爭型免疫分析法偵測硫酸紫菌素
(Development of a Bead-based 96-well Filtration Plate Competitive Immunoassay for the Detection of Gentamycin)

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摘要(中)

我們藉由在脫脂牛奶中偵測硫酸紫菌素 (Gentamycin)，建立了一個靈敏、簡易、平價並且快速的免疫分析平台。此偵測平台由奈米脂粒訊號放大系統、硫酸紫菌素微珠以及96孔過濾盤所組成；此競爭型免疫分析是藉由製成硫酸紫菌素微珠做為與分析物硫酸紫菌素競爭硫酸紫菌素抗體的競爭者。而所有的反應步驟皆於底部黏貼封膜的96孔過濾盤中操作，反應完成後清洗多餘未結合反應物的步驟則可輕易將大量清洗液通過已經除去封膜的96孔過濾盤而完成，無須任何反覆離心或者抽真空的步驟，而抗體將藉由與硫酸紫菌素微株的結合而滯留於96孔過濾盤中。接著加入接合蛋白質G並包有螢光物質的奈米脂粒，藉由蛋白質G與抗體之間的結合特性使滯留於96孔過濾盤中的硫酸紫菌素抗體與硫酸紫菌素微株複合物攜帶包有螢光物質的奈米脂粒，將多餘未結合的奈米脂粒洗除以後再將滯留於96孔過濾盤中的螢光訊號以介面活性劑將之自奈米脂粒釋放並收集在96孔盤中。此平台針對在Tris buffered saline緩衝液 (TBS) 以及脫脂牛奶中偵測硫酸紫菌素的偵測極限 (Limit of detection, LOD)分別為52.65 ng/mL 和14.16 ng/mL，皆足以偵測在Codex中法規所訂定的 200 ng/mL 最大殘留量濃度。在 TBS 以及脫脂牛奶中的偵測範圍為各自的偵測極限至100 μg/mL。最低可定量濃度個別為257.06 ng/mL 和 236.85 ng/mL。最後，此平台在 TBS 和脫脂牛奶中的50%抑制率濃度各自為199.66 ng/mL 和 360.81 ng/mL。亦藉由在脫脂牛奶中單獨偵測硫酸紫菌素與同時偵測硫酸紫菌素及另外5種抗生素的混合液來確認此偵測平的專一性。此偵測平台在60個不同樣本同時操作之下仍可在2小時內完成。而以上的結果皆可證明此新建立的生物感測法不但具有磁珠式分析法的優點，藉由96孔過濾盤分離法取代磁吸式分離法亦兼具節省成本以及操作簡易的優勢。

摘要(英)

We developed a sensitive, simple, inexpensive and rapid immunoassay platform for the detection of Gentamycin in milk. This platform was composed of liposomal nanovesicle amplification system, Gentamycin sulfate beads and 96-well filtration plates. Gentamycin beads were constructed as a competitor of analyte for the recognition by antibody. The incubation for this competitive assay was conducted in a bottom-sealed 96-well filtration plate. By running washing buffers through the unsealed 96-well filtration plate with gravity but without any spin or vacuum force, the antibody-Gentamycin bead complexes were separated from the rest of the components in the solution. Fluorescent dye-loaded protein G-liposomal nanovesicles were added to specifically bind to antibodies on the beads retained in the sealed 96-well filtration plate. After washing unbound nanovesicles, millions of fluorescent dye molecules were released by adding a detergent solution to lyse liposomal nanovesicles. Results showed that the limit of detection (LOD) of this novel detection platform in TBS and in skim milk were 52.65 ng/mL and 14.16 ng/mL, which are both sufficient for detecting the 200 ng/mL Codex maximum residual level (MRL). The dynamic ranges were both from each of their LODs to 100μg/mL. The LOQs were 257.06 ng/mL and 236.85 ng/mL for detection in TBS and skim milk respectively. The 50% inhibition concentrations (IC50) in TBS and skim milk were 199.66 ng/mL and 360.81 ng/mL, respectively. We also demonstrated the good specificity of this platform by comparing detection results between pure Gentamycin solution and a mixture solution of Gentamycin with other 5 different antibiotics. The entire assay with 60 samples was conducted within 2 h. These results demonstrated that this novel biosensing platform not only fulfilled most benefits of magnetic bead-based assays, but also was inexpensive and convenient by replacing the magnetic separation with a 96-well filtration plate separation.

關鍵字(中)

★ 免疫分析平台
★ 奈米脂粒
★ 微珠
★ 96孔過濾盤
★ 競爭型免疫分析
★ 抗生素
★ 脫脂牛奶

關鍵字(英)

★ immunoassay platform
★ liposomal nanovesicle
★ beads
★ 96-well filtration plates
★ competitive assay
★ antibiotic
★ skim milk

論文目次

中文摘要 i
ABSTRACT iii
ABBREIVIATION v
AKNOWLEDGMENT vi
CONTENTS vii
LIST OF FIGURES ix
LIST OF TABLES x
INTRODUCTION 1
I MATERIALS AND METHODS 4
I.1 Reagents and Apparatus 4
I.2 Preparation of N-succinimidyl-S-acetylthioacetate (SATA)-modified and SRB-loaded Liposomal Nanovesicles 5
I.3 Conjugation of Protein G to SATA-modified Liposome 6
I.4 Binding Test for Conjugation Verification 7
I.5 Gentamycin Bead Preparation 7
I.6 Bead-based 96-well Filtration Plate Competitive Immunoassays 8
II RESULTS AND DISCUSSION 11
II.1 Conjugation between protein G and liposomal nanovesicles 18
II.2 Linear Dose Response Correlation of Gentamycin Sulfate in TBS 20
II.3 Entire Dose Response Curves of Gentamycin sulfate Detection in TBS and Skim Milk 22
II.4 Gentamycin sulfate Detection Specificity 27
II.5 Detection of Other Antibiotics 29
CONCLUSION 31
REFFERENCES 32

參考文獻

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指導教授

陳健生(Chien-Sheng Chen)

審核日期

2013-1-31

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