| Abstract: | Abstract β-naphthoxyacetic acid (NOA) residues in strawberries have been determined in acetone extracts using direct, first and second derivatives with spectrofluorimetric detection, without clean-up procedures needed. Solvent effects on the spectral characteristics of NOA solutions and their influences on the sensitivity of its variables and instrumental parameters are also studied. A detection limit of 1.14 ng/ml was achieved using the first derivative approach. Strawberries were fortified at different NOA concentrations (10 to 90 ng/ml). Recoveries averaged 87.2% (range 80.16–98.53) at the lower fortification level and 98.36% (range 97.54–99.63) for the higher fortification level. |
