Wei Q, Li YY, Li Y, Du B, Duan CH. Rapid and highly sensitive determination of trace proteins using dibromomethyl carboxyazo–Pb(II) complex as a spectroscopic reagent.
Clin Chim Acta 2005;
362:79-84. [PMID:
15996646 DOI:
10.1016/j.cccn.2005.05.013]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2005] [Revised: 04/10/2005] [Accepted: 05/27/2005] [Indexed: 11/26/2022]
Abstract
BACKGROUND
The concentration of protein in body fluids is an important measure in disease diagnosis and in analytical biochemistry. Searching for a sensitive and rapid method for proteins is an ongoing subject of investigation. We describe the reaction of dibromomethyl carboxyazo-Pb(II) with proteins found in urine.
METHODS
In a buffer containing of HCl and KCl at pH 1.80, dibromomethyl carboxyazo-Pb(II) complex combined with proteins to form a colored compound. The reaction was completed in 2 min and remained stable for 80 min. Under optimum conditions, the product of reaction between protein and dibromomethyl carboxyazo-Pb(II) absorbed at 530 nm and was linear in the range of 0-50 microg/ml of BSA. Moreover, the maximum binding number was defined to express the binding ability of dibromomethyl carboxyazo-Pb(II) to protein under a given set of conditions.
RESULTS
The method was applied to the determination of urine proteins. The recovery of protein from human urine was 97.6-103% and the precision was <4.8%. Results compared favorably to the Biuret and Bradford protein methods on 50 urine samples.
CONCLUSIONS
This method had high sensitivity and specificity and may be applicable to clinical analysis.
Collapse