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Table 3 Methodology for choosing a reagent for the development of the spectrophotometric methods for the determination of dihydropyridines CCBs

From: Novel ecofriendly spectrophotometric methods for the determination of six dihydropyridines calcium channel blockers through derivatization with sulfophtalein dye: application to tablet analysis

Analyte

Reagent

Optimal conditions (wavelenght, solvent, molar concentration)

Possibility of application

Remark

AML

BCG

415 nm, MetOH, 5.0*10–4 M

No

pH adjustment

BTB

405 nm, MetOH, 2.49*10–4 M

No

pH adjustment

BPB

598 nm, MetOH, 6.0*10–5 M

Yes

Methanol medium, absorption maximum at a wavelength 598 nm

BCP

415 nm, EtAc, 2.26*10–4 M

No

pH adjustment

CR

398 nm, AcN, 2.5*10–4 M

No

pH adjustment

PR

350 nm, AcN, 1.0*10–4 M

No

No interaction

TB

405 nm, AcN, 1.0*10–4 M

No

pH adjustment

NIF

BCG

405 nm, MetOH, 5.0*10–4 M

No

pH adjustment

BTB

398 nm, MetOH, 2.76*10–4 M

No

pH adjustment

BPB

598 nm, MetOH, 5.0*10–4 M

Yes

Methanol medium, absorption maximum at a wavelength 598 nm

BCP

415 nm, EtAc, 2.26*10–4 M

No

pH adjustment

CR

380 nm, AcN, 2.5*10–4 M

No

pH adjustment

PR

350 nm, AcN, 2.26*10–4 M

No

No interaction

NIT

BCG

415 nm, MetOH, 5.0*10–4 M

No

pH adjustment

BTB

350 nm, MetOH, 2.77*10–5 M

No

pH adjustment

BPB

598 nm, metOH, 5,0*10–4 M

Yes

Methanol medium, absorption maximum at a wavelength 598 nm

BCP

415 nm, EtAc, 2.26*10–4 M

No

No interaction

CR

398 nm, AcN, 2.5*10–4 M

No

pH adjustment

TB

350 nm, AcN, 1.0*10–4 M

No

No interaction

NIM

BTB

423 nm, MetOH, 5.0*10–5 M

No

pH adjustment

BPB

598 nm, AcN

Yes

Acetonitrile medium, absorption maximum at a wavelength 598 nm

BCP

420 nm, MetOH, 5.0*10–5 M

No

pH adjustment

CR

423 nm, EtOH, 1.0*10–4 M

No

pH adjustment

TB

390 nm, AcN, 1.0*10–4 M

No

pH adjustment

LAC

BCG

MetOH, 1*10–3 M

No

No interaction

BTB

MetOH, 1.0*10–3 M

No

No interaction

BPB

AcN, 1.0*10–3 M

Yes

Acetonitrile medium, absorption maximum at a wavelength 598 nm

BCP

MetOH, 1.0*10–3 M

No

No interaction

MR

AcN, 1.0*10–3 M

No

No interaction

CR

MetOH, 1.0*10–3 M

No

No interaction

PR

MetOH, 1.0*10–3 M

No

No interaction

TB

MetOH, 1.0*10–3 M

No

No interaction

LAML

BCG

MetOH, 1.0*10–3 M

No

No interaction

BTB

MetOH, 1.0*10–3 M

No

No interaction

BPB

MetOH, 1.0*10–3 M

Yes

Methanol medium, absorption maximum at a wavelength 598 nm

BCP

MetOH, 1.0*10–3 M

No

No interaction

MR

AcN, 1.0*10–3 M

No

No interaction

CR

MetOH, 1.0*10–3 M

No

No interaction

PR

MetOH, 1.0*10–3 M

No

No interaction

TB

MetOH, 1.0*10–3 M

No

No interaction