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A silicon nitride ISFET based immunosensor for Ag85B detection of tuberculosis
Saengdee P. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): A silicon nitride ISFET based immunosensor for Ag85B detection of tuberculosis
ผู้แต่ง / หัวหน้าโครงการ (EN): Saengdee P.
บทคัดย่อ (EN): A silicon nitride Ion Sensitive Field Effect Transistor (ISFET) based immunosensor was developed as a low-cost and label-free electrical detection for the detection of antigen 85 complex B (Ag85B). The sensing membrane of the ISFET was modified with 3-aminopropyltriethoxysilane (APTES) followed by glutaraldehyde (GA), yielding an aldehyde-terminated surface. This group is available for immobilization of a monoclonal antibody against a recombinant Ag85B protein (anti-Ag85B antibody). The optimal concentration for anti-Ag85B antibody immobilization onto the modified ISFET was 100 μg ml-1. This optimal condition provided the maximal binding capability and minimal non-specific background signal. The binding event between the recombinant Ag85B antigen and anti-Ag85B antibody on the ISFET surface is presented by monitoring the gate potential change at a constant drain current. The dose response for the recombinant Ag85B protein showed a linear response between 0.12 and 1 μg ml-1 without significant interference from other recombinant proteins. The analytical imprecision (CV%) and accuracy of this Ag85B protein biosensor were 9.73-10.99% and 95.29%, respectively. In addition, an irrelevant antibody and other recombinant proteins were employed as a negative control to demonstrate the non-specific interaction of the antigen and antibody. The success of this immunosensor system for Ag85B protein detection facilitates the construction of a promising device which can shorten the turnaround time for the diagnosis of tuberculosis compared to a standard culture method. Furthermore, this device could also be applied for real-time growth monitoring of Mycobacterium tuberculosis in a mycobacterial culture system. © 2016 The Royal Society of Chemistry.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): https://www.scopus.com/inward/record.uri?eid=2-s2.0-84990061917&doi=10.1039%2fc6an00568c&partnerID=40&md5=ed238e48d1d67156c4ae60f526baaa26
เผยแพร่โดย (EN): มหาวิทยาลัยมหิดล
คำสำคัญ (EN): Tuberculosis
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยมหิดล
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A silicon nitride ISFET based immunosensor for Ag85B detection of tuberculosis
Saengdee P.
มหาวิทยาลัยมหิดล
ไม่ระบุวันที่เผยแพร่
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