Sensitive phosphorimetric determination of bumetanide in human urine with its inhibition effect on the formation of [Fe-morin]3+ complex.
A novel solid substrate-room temperature phosphorimetry (SS-RTP) was developed for determination of bumetanide (BMTN). It was validated by determining selectivity, linearity, accuracy, precision, and signal to noise ratio (S/N) for analysis. And all the experiments presented in this work were based on that BMTN inhibited the formation of [Fe-morin](3+) ([FeR](3+)) complex by the reaction between Fe(3+) and R, which led to severe quenching of room temperature phosphorescence (RTP) signal. The rate constant of the reaction (k) was 2.44 x 10(-4) s(-1), the activation energy (E) was 21.39 kJ mol(-1). Detection limit of this method (LD, 5.0 ag spot(-1), corresponding concentration was 1.2 x 10(-14) g mL(-1)) was evaluated and compared with other methods, indicating better sensitivity for BMTN determination using this technique. And due to the high sensitivity of the method, it has been successfully applied to determine BMTN in human urine samples. The linear range was from 0.040 pg mL(-1) to 4.0 pg mL(-1), allowing wide determined range of BMTN. Meanwhile, the mechanism of this method was also discussed.
Zeng
Li-Qing
LQ
Department of Chemistry and Environmental Science, Zhangzhou Normal College, Zhangzhou, 363000, People's Republic of China.
Liu
Jia-Ming
JM
Li
Fei-Ming
FM
Huang
Xiao-Mei
XM
Lin
Li-Ping
LP
Wang
Xin-Xing
XX
Zhang
Li-Hong
LH
Lin
Chang-Qing
CQ
D002034:Bumetanide / Q000737:chemistry / Q000652:urine*; D005419:Flavonoids / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D016014:Linear Models; D008163:Luminescent Measurements / Q000379:methods*; D008297:Male; D009942:Organometallic Compounds / Q000737:chemistry*; D016482:Urinalysis / Q000379:methods*; D055815:Young Adult; D047309:Flavones
D002034:Bumetanide; D005419:Flavonoids; D007501:Iron; D009942:Organometallic Compounds; C008548:morin; D047309:Flavones