HPLC-ECDHigh Performance Liquid Chromatography coupled to Electrochemical Detection
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Considering the lack of studies employing a sensitive, selective, fast, and easily operated procedure to determine polyphenols in sugarcane vinasse, this work developed a method for detection and quantification of phenolic acids in a vinasse sample by HPLC-ECD with PAD employing a GCE.
Also, concerning HPLC-ECD, employment of an organic solvent in mobile phase induced noise during chromatographic separation with PAD of furanic aldehydes as previously observed [50].
From the various methods included into this interlaboratory trial, the chromatographic methods (mass spectrometry and HPLC-ECD) were generally comparable, while ELISA-based methods overestimated the 8-oxodG content and were not as robust [104].
The discrepancy between our results and those of that study may be explained by the difference in the precision of HPLC-ECD methods.
We compared the results obtained by XLC-MS/MS and HPLC-ECD methods for patient specimens routinely screened for pheochromocytoma.
Correlation parameters show similarity between HPLC-ECD and XLC-MS/MS.
HPLC-ECD analysis showed no signal in the chromatogram, but a marked disturbance was seen when the pretreatment was omitted, indicating that pretreatment eliminates the interference caused by MAA and AA.
The basal urinary 8-oxodGuo concentration observed in this study was ~4.69 [micro]g/g of creatinine, which is in good agreement with several previous measurements obtained with HPLC-ECD, GC-MS, and LC-MS/MS (3-6 [micro]g/g of creatinine) (22, 27, 28).
We showed that this method has a lower LOD (2.0 fmol) than previously reported HPLC-ECD and LC-MS/MS methods and could be suitable for analysis of 8-oxodGuo in human serum and DNA.
Bland-Altman plots for the results of the correlation study with a comparative HPLC-ECD method for urine samples are presented in Fig.
Regression equations, correlation coefficients, and [S.sub.y/x] for the correlation between the LC-MS/MS method and the comparison HPLC-ECD method.