Feasibility of on-chip detection of endotoxin by LAL test

Autor: Yoomin Ahn, Chang Woo Suh, Yang Sun Kim, Hyo Jin Choi, Gi Hoon Seong, Sang Youn Hwang, Eun Kyu Lee
Rok vydání: 2004
Předmět:
Zdroj: Biotechnology and Bioprocess Engineering. 9:132-136
ISSN: 1976-3816
1226-8372
DOI: 10.1007/bf02932996
Popis: The LAL (Limulus amebocyte lysate) test for the detection and quantification of endotoxin is based on the gelation reaction between endotoxin and LAL from a blood extract ofLimulus polyphemus. The test is labor intensive, requiring dedicated personnel, a relatively long reaction time (approximately 1 h), relatively large volumes of samples and reagents and the detection of the end-point is rather subjective. To solve these problems, a miniaturized LOC (labon-a-chip) prototype, 62 mm (L)×18 mm (W), was fabricated using PDMS (polydimethylsiloxane) bonded to glass. Using this prototype, in which 2 mm (W)×44.3 mm (L)×100 μm(D) microfluidic channel was constructed, turbidometric and chromogenic assay detection methods were compared, and the chromogenic method was found the most suitable for a small volume assay. In this assay, the kinetic-point method was more accurate than the end-point method. The PDMS chip chickness was found to be minimized to around 2 mm to allow sufficient light transmittance, which necessitated the use of a glass slide bonding for chip rigidity. Due to this miniaturization, the test time was reduced from 1 h to less than 10 min, and the sample volume could be reduced from 100 toca. 4.4 μL. In summation, this study suggested that the LOC using the LAL test principle could be an alternative as a semi-automated and reliable method for the detection of endotoxin.
Databáze: OpenAIRE
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