title: Application of stochastic resonance to quantitative analysis of weak chromatographic signal of phenazopyridine in human plasma.
abstract: OBJECTIVE
  To apply stochastic resonance algorithm (SRA) to quantitative analysis of weak chromatographic signal, which was embedded in the noise.
  
  
  METHODS
  Based on the theory of stochastic resonance (SR), a simple and effective SRA has been established to improve analytical detection limits of chromatographic analysis, which apply to enhance the signal to noise ratio by the optimization of the parameters and Runge-Kutta method, was established. The method was used to quantitative analysis of phenazopyridine in human plasma by HPLC/UV. Meanwhile this method is compared with HPLC/MS.
  
  
  RESULTS
  By experimental chromatographic data sets, an excellent quantitative relationship between concentrations of phenazopyridine and their responses had been obtained. The concentration of phenazopyridine in plasma determined by HPLC/UV with SRA and HPLC/MS showed that there was no significant difference (P > 0.05) between the two methods.
  
  
  CONCLUSIONS
  The new method was feasible.
authors.affiliation: Center for Instrumental Analysis of China Pharmaceutical University, Nanjing 210009, China.
authors.forename: Yan-Wei
authors.initials: YW
authors.lastname: Wu
authors.forename: Bing-Ren
authors.initials: BR
authors.lastname: Xiang
authors.forename: Er-Xin
authors.initials: EX
authors.lastname: Shang
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006801:Humans; D013058:Mass Spectrometry; D009622:Noise; D010621:Phenazopyridine / Q000097:blood*; D012684:Sensory Thresholds; D013056:Spectrophotometry, Ultraviolet; D013269:Stochastic Processes
chemical_list: D010621:Phenazopyridine