Determination of trace alkaline phosphatase by affinity adsorption solid substrate room temperature phosphorimetry based on wheat germ agglutinin labeled with 8-quinolineboronic acid phosphorescent molecular switch and prediction of diseases.
The 8-quinolineboronic acid phosphorescent molecular switch (abbreviated as PMS-8-QBA. Thereinto, 8-QBA is 8-quinolineboronic acid, and PMS is phosphorescent molecular switch) was found for the first time. PMS-8-QBA, which was in the "off" state, could only emit weak room temperature phosphorescence (RTP) on the acetyl cellulose membrane (ACM). However, PMS-8-QBA turned "on" automatically for its changed structure, causing that the RTP of 8-QBA in the system increased, after PMS-8-QBA-WGA (WGA is wheat germ agglutinin) was formed by reaction between -OH of PMS-8-QBA and -COOH of WGA. More interesting is that the -NH(2) of PMS-8-QBA-WGA could react with the -COOH of alkaline phosphatase (AP) to form the affinity adsorption (AA) product WGA-AP-WGA-8-QBA-PMS (containing -NH-CO- bond), which caused RTP of the system to greatly increase. Thus, affinity adsorption solid substrate room temperature phosphorimetry using PMS-8-QBA as labelling reagent (PMS-8-QBA-AA-SSRTP) for the determination of trace AP was established. The method had many advantages, such as high sensitivity (the detection limit (LD) was 2.5zgspot(-1). For sample volume of 0.40mulspot(-1), corresponding concentration was 6.2x10(-18)gml(-1)), good selectivity (the allowed concentration of coexisting material was higher, when the relative error was +/-5%), high accuracy (applied to detection of AP content in serum samples, the result was coincided with those obtained by enzyme-linked immunoassay), which was suitable for the detection of trace AP content in serum samples and the forecast of human diseases. Meanwhile, the mechanism of PMS-8-QBA-AASSRTP was discussed. The new field of analytical application and clinic diagnosis technique of molecule switch are exploited, based on the phosphorescence characteristic of PMS-8-QBA, the AA reaction between WGA and AP, as well as the relation between AP content and human diseases. The research results promote the development and interpenetrate among molecule switch technique, lectin science and SSRTP.
Liu
Jia-Ming
JM
Department of Chemistry and Environmental Science, Zhangzhou Normal College, Zhangzhou 363000, PR China. zzsyliujiaming@163.com
Gao
Hui
H
Li
Fei-Ming
FM
Shi
Xiu-Mei
XM
Lin
Chang-Qing
CQ
Lin
Li-Ping
LP
Wang
Xin-Xing
XX
Li
Zhi-Ming
ZM
D000327:Adsorption; D000469:Alkaline Phosphatase / Q000737:chemistry* / Q000378:metabolism; D001897:Boronic Acids / Q000737:chemistry*; D004194:Disease; D006801:Humans; D057230:Limit of Detection; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods* / Q000592:standards; D015394:Molecular Structure; D011804:Quinolines / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013696:Temperature; D014909:Wheat Germ Agglutinins / Q000737:chemistry* / Q000378:metabolism
D001897:Boronic Acids; D011804:Quinolines; D014909:Wheat Germ Agglutinins; C477948:8-quinolineboronic acid; D000469:Alkaline Phosphatase