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Table 1 Results showing the effect of solvents on the absorbance of C-T complexes when 160 and 32 μg mL-1 MEB used in the reaction in PCA and DDQ methods, respectively

From: Application of two charge transfer complex formation reactions for selective determination of metformin hydrochloride in pharmaceuticals and urine

Solvent PCA method DDQ method
λmaxa, nm Absorbance of blank at λmax Absorbance of product of MEB and PCA at λmax λmaxa, nm Absorbance of blank at λmax Absorbance of product of MEB and DDQ at λmax
Acetonitrile 530.0 0.013 0.496 460.0 0.006 0.520
Chloroform 525.0 0.014 0.232 450.0 0.018 0.315
Methanol 520.0 0.019 0.331 450.0 0.024 0.321
Ethanol 520.0 0.014 0.292 450.0 0.011 0.268
Acetone 520.0 0.014 0.232 445.0 0.017 0.260
1,4-Dioxane 520.0 0.018 0.124 450.0 0.019 0.160
Dichloromethane 525.0 0.023 0.212 450.0 0.022 0.302
Dimethylformamide 525.0 0.028 0.224 450.0 0.024 0.319
  1. aWavelength maximum of C-T complexes in respective solvent