Dopamine ion-selective electrode for potentiometry in pharmaceutical preparations

• Type: Article in International Scientific Journal
• Date: 1999

Authors

Lima, JLFC (Author) FFUP; Montenegro, MCBSM (Author) FFUP

Journal

Title: Mikrochimica Acta

Vol. 131

Pages: 187-190

ISSN: 0026-3672

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 51 Citations

Scopus - 55 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-001-603

DOI: 10.1007/pl00010030

Abstract (EN): This paper reports the construction and evaluation of a dopamine sensitive electrode and its usefulness for the determination of this compound by direct potentiometry in pharmaceutical preparations. The electrode comprised a carboxylated poly(vinyl chloride) membrane based on beta-cyclodextrine dissolved in 2-fluoro-2-nitrodiphenyl ether and using tetrakis(p-chlorophenyl) berate as a fixed anionic site. For comparison purposes membranes with similar composition but including normal high molecular weight PVC were also prepared, The electrodes including carboxylated poly(vinyl chloride) presented linear response within the concentration range of 5 x 10(-5) and 10(-1) mol dm(-3) of dopamine with a slope of about 59 mV decade(-1) of activity, in the pH range of 2 to 7.5 units. The response time was less than 15 seconds. Selectivity coefficients for different interferents including sodium, potassium, ammonium, lithium, epinephrine and norepinephrine were evaluated using the separated solution method and no significant interferences were observed. The electrode displays useful analytical characteristics for the direct determination of dopamine in pharmaceutical preparations. Results with an average recovery of 98.6 +/- 0.3% were obtained.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4