TY - JOUR

T1 - An automatic chemiluminescence method based on the multi-pumping flow system coupled with the fluidized reactor and direct-injection detector

T2 - Determination of uric acid in saliva samples

AU - Vakh, Christina

AU - Koronkiewicz, Stanislawa

AU - Kalinowski, Slawomir

AU - Moskvin, Leonid

AU - Bulatov, Andrey

N1 - -

PY - 2017/5/15

Y1 - 2017/5/15

N2 - A novel approach for the automatic chemiluminescence (CL) analysis of the complex samples is proposed. A multi-pumping flow system was successfully combined with fluidized reactor and direct-injection CL detector. The possibility of the approach was demonstrated on the determination of uric acid in saliva samples. Uric acid is clinically important analyte and its determination in biological fluids is related to human organism dysfunctions, such as gout. For the first time, the fast luminol – N-bromosuccinimide (NBS) reaction in an alkaline medium was used for the CL determination of uric acid in saliva samples. The CL intensity is greatly quenched in the presence of the analyte. The method includes on-line separation of uric acid from the saliva samples based on fluidized beds strategy using anion-exchange resin Dowex® 2×8 followed by the elution and CL determination using a direct-injection CL detector. The stroke pulsations of the solenoid micro-pumps provided the floating of the anion exchange resin in a sample phase and uric acid separation from the sample matrix into a sample pre-treatment block of flow system. To obtain efficient elution of analyte an eluent circulation was applied. Under the optimal conditions, the detector response for uric acid was linear in the logarithmic concentration ranges from 6·10−6 to 1·10−3 mol L−1. The limit of detection, calculated from a blank test based on 3σ, was 2·10−6 mol L−1. Fluidized bed strategy allows us to exclude saliva matrices influence on the luminol–NBS CL reaction, which results in improved selectivity. The applicability of the method developed is demonstrated with the help of real sample analysis. The obtained results are confirmed by reference HPLC-UV method.

AB - A novel approach for the automatic chemiluminescence (CL) analysis of the complex samples is proposed. A multi-pumping flow system was successfully combined with fluidized reactor and direct-injection CL detector. The possibility of the approach was demonstrated on the determination of uric acid in saliva samples. Uric acid is clinically important analyte and its determination in biological fluids is related to human organism dysfunctions, such as gout. For the first time, the fast luminol – N-bromosuccinimide (NBS) reaction in an alkaline medium was used for the CL determination of uric acid in saliva samples. The CL intensity is greatly quenched in the presence of the analyte. The method includes on-line separation of uric acid from the saliva samples based on fluidized beds strategy using anion-exchange resin Dowex® 2×8 followed by the elution and CL determination using a direct-injection CL detector. The stroke pulsations of the solenoid micro-pumps provided the floating of the anion exchange resin in a sample phase and uric acid separation from the sample matrix into a sample pre-treatment block of flow system. To obtain efficient elution of analyte an eluent circulation was applied. Under the optimal conditions, the detector response for uric acid was linear in the logarithmic concentration ranges from 6·10−6 to 1·10−3 mol L−1. The limit of detection, calculated from a blank test based on 3σ, was 2·10−6 mol L−1. Fluidized bed strategy allows us to exclude saliva matrices influence on the luminol–NBS CL reaction, which results in improved selectivity. The applicability of the method developed is demonstrated with the help of real sample analysis. The obtained results are confirmed by reference HPLC-UV method.

KW - Chemiluminescence

KW - Direct-injection detector

KW - Fluidized reactor

KW - Multi-pumping flow system

KW - Saliva

KW - Uric acid

KW - -

UR - http://www.scopus.com/inward/record.url?scp=85013422173&partnerID=8YFLogxK

U2 - 10.1016/j.talanta.2017.02.009

DO - 10.1016/j.talanta.2017.02.009

M3 - Article

AN - SCOPUS:85013422173

VL - 167

SP - 725

EP - 732

JO - Talanta

JF - Talanta

SN - 0039-9140

ER -