Oxidative Coupling Assay for Mesalazine Determination in Pharmaceuticals and Spiked Human Plasma Utilizing Syringic Acid

Table 7

Comparison of the proposed method with other spectrophotometric methods.

Reference	λmax (nm)	Type of reaction	Beer’s law (μg·mL^−1)	LOD (μg·mL^−1)	LOQ (μg·mL^−1)	(L·mol^−1·cm^−1)	RSD (%)
[6]	440	Schiff ’s base	50–500	0.699	1.84	3.744 × 10^2	0.00436
[29]	610	Oxidative coupling	0.1–11	—	—	2.055 × 10^4	0.714
[8]	640	Diazotization and coupling	1.25–30	0.14	0.483	0.36 × 10^4	0.17
[37]	459	Oxidative coupling	2.5–37.5	—	—	3.36 × 10^3	0.87
[10]	600	Charge transfer	15–97.5	4.92	14.89	1.18 × 10^3	0.890
[11]	645	Oxidative coupling	0.4–12	0.101	0.338	22435	1.54
[12]	687	—	15–50	0.5808	1.76	0.001958	0.4024
[13]	525	Diazotization and coupling	0.5–40	0.113	0.342	1.50 × 10^4	0.615
Present work	615	Oxidative coupling	1.25–50	0.093	0.282	0.53 × 10^4	0.61