| Autor: |
de Oliveira Costa C; Department of Chemistry, CCEN, Federal University of Alagoas, 57072-970 Maceió, AL, Brazil., Miranda PR, Hazra B, Das Sarma M, de Cássia Silva Luz R, Kubota LT, Goulart MO |
| Jazyk: |
angličtina |
| Zdroj: |
Talanta [Talanta] 2006 Feb 15; Vol. 68 (4), pp. 1378-83. Date of Electronic Publication: 2005 Sep 06. |
| DOI: |
10.1016/j.talanta.2005.08.001 |
| Abstrakt: |
A sensor based on glassy carbon (GC) electrode modified with cobalt tetrasulfonated phthalocyanine (CoTSPc) and a poly-l-lysine (PLL) film is proposed for diospyrin determination in nanomolar concentrations with differential pulse voltammetry (DPV) technique. The modified electrode showed excellent catalytic activity presenting much higher peak currents than those measured on a bare GC electrode. Linear response range, sensitivity and limit of detection (LOD) were of 1-120nmoll(-1), 220.46nAlnmol(-1)cm(-2) and 0.3nmoll(-1), respectively. The repeatability of the proposed sensor, evaluated in term of relative standard deviation (R.S.D.), was measured as 4.4% for 10 experiments in 50mumoll(-1) diospyrin samples. The developed sensor was applied for the determination of diospyrin in the crude extracts of the stem-bark of Diospyros montana Roxb. and the average recovery for these samples was 101.9 (+/-3.1)%. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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