A PMMA microcapillary quantum dot linked immunosorbent assay (QLISA)

The development of a simple and inexpensive quantum dot based immunoassay for detecting myeloperoxidase (MPO) in stool samples is reported (QLISA). The method developed utilizes readily available polymethylmethacrylate (PMMA) microcapillaries as substrates for performing the sandwich assay. High pow...

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Bibliographic Details
Published in:Biosensors & bioelectronics 2009-08, Vol.24 (12), p.3467-3474
Main Authors: Babu, Sundar, Mohapatra, Sakya, Zubkov, Leonid, Murthy, Sreekant, Papazoglou, Elisabeth
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Biosensing Techniques - instrumentation
Biosensor
Biosensors
Biotechnology
Capillary Action
ELISA
Enzyme-Linked Immunosorbent Assay - instrumentation
Equipment Design
Equipment Failure Analysis
Feces - chemistry
Fundamental and applied biological sciences. Psychology
IBD
Inflammation
Methods. Procedures. Technologies
Microfluidic
Miniaturization
MPO
Peroxidase - analysis
PMMA capillary
Polymethyl Methacrylate - chemistry
QLISA
Quantum Dots
Reproducibility of Results
Sensitivity and Specificity
Spectrometry, Fluorescence - instrumentation
Various methods and equipments
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Summary:The development of a simple and inexpensive quantum dot based immunoassay for detecting myeloperoxidase (MPO) in stool samples is reported (QLISA). The method developed utilizes readily available polymethylmethacrylate (PMMA) microcapillaries as substrates for performing the sandwich assay. High power (80 mW) and low power (10 mW) UV-LEDs were tested for their efficiency in maximizing detection sensitivity in a waveguide illumination or a side illumination mode. The results obtained indicate that both waveguide and side illumination modes can be employed for detecting MPO down to 15 ng/mL, however the high power LED in a side illumination mode improves sensitivity and simplifies the data acquisition process. The protocol and sensor robustness was evaluated with animal stool samples spiked with MPO and the results indicate that the sensitivity of detection is not compromised when used in stool samples. The effect of the ionic strength of the environment on the fluorescence stability of quantum dots was evaluated and found to affect the assay only if long imaging times are employed. Replacing the buffer with glycerol during imaging increased the fluorescence intensity of quantum dots while significantly minimized the loss in intensity even after 2 h.
ISSN:0956-5663
1873-4235
DOI:10.1016/j.bios.2009.04.043