Determination of Phenolic Acids in Sugarcane Vinasse by HPLC with Pulse Amperometry

Table 2

Figures of merit for determination of polyphenols by HPLC-PAD.

Figure of merit	GA	VA	CA	FA	p-COA
Concentration range (mg L^−1)	0.018–18.0	0.15–19.4	0.13–17.0	0.016–16.4	0.008–16.8
Amperometric sensibility (A L mg^−1)	84 ± 1.89	49 ± 0.69	28  0.39	6.0 ± 0.14	56 ± 0.70
Correlation coefficient	0.996	0.997	0.998	0.995	0.998
LOD (mg L^−1)	0.085	0.0042	0.0045	0.097	0.0016
Precision (%)	3.78	2.19	2.75	1.73	3.05

GA, gallic acid; VA, vanillic acid; CA, caffeic acid; FA, ferulic acid; p-COA, p-coumaric acid.