On-chip Immunoassay for Determination of Urinary Albumin

Overview

Journal Sensors (Basel)

Publisher MDPI

Specialty Biotechnology

Date 2012 Feb 4

PMID 22303162

Citations 7

Authors

Wanida Laiwattanapaisal

Temsiri Songjaroen

Thitima Maturos

Tanom Lomas

Assawapong Sappat

Adisorn Tuantranont

Affiliations

Soon will be listed here.

Abstract

An immunoassay performed on a portable microfluidic device was evaluated for the determination of urinary albumin. An increase in absorbance at 500 nm resulting from immunoagglutination was monitored directly on the poly(dimethylsiloxane) (PDMS) microchip using a portable miniature fibre-optic spectrometer. A calibration curve was linear up to 10 mg L(-1) (r(2) = 0.993), with a detection limit of 0.81 mg L(-1) (S/N = 3). The proposed system showed good precision, with relative standard deviations (RSDs) of 5.1%, when evaluated with 10 mg L(-1) albumin (n = 10). Determination of urinary albumin with the proposed system gave results highly similar to those determined by the conventional spectrophotometric method using immunoturbidimetric detection (r(2) = 0.995; n = 15).

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