In this work, we conducted a study on the analysis of monosodium glutamate (MSG) in broths by the induced fluorescence derivatization (IFD) method. The method was based on the derivatization of natura Show more
In this work, we conducted a study on the analysis of monosodium glutamate (MSG) in broths by the induced fluorescence derivatization (IFD) method. The method was based on the derivatization of naturally non-fluorescent MSG to form a fluorescent structure when reacting with orthophthalaldehyde (OPA). The chemical reaction parameters were optimized in an aqueous medium. The calibration curve was subsequently established under optimal conditions, and its linearity was assessed using variance analysis, which indicated a significant regression. The low LOD (0.006 ng mL Show less
In this paper, we present the design of a new automatic fluorescence monitoring system (AUTOFLUO) for real-time control of pesticide contamination in natural waters. This system was used to analyse tw Show more
In this paper, we present the design of a new automatic fluorescence monitoring system (AUTOFLUO) for real-time control of pesticide contamination in natural waters. This system was used to analyse two fluorescent pyrethroid insecticides, phenothrin (PHE) and permethrin (PER), currently used in the Niayes agricultural district in Senegal. The results were then compared with those obtained using the classical fluorescence method (FLUO). The analytical parameters (λex, λem, and pH) were optimised. Phenothrin exhibits maximum excitation and emission wavelengths of 221 and 321 nm, respectively, whereas permethrin has these values at 210 and 297 nm. The optimum pH value was determined to be 7 for PHE and 8 for PER. The linearity of both the calibration and standard addition curves was validated through variance analysis. A Student's t-test demonstrated that the intercept values of the calibration curves were not significantly different from zero (p > 5 %). The limit of detection (LOD) ranges from 0.02 to 5.16 ng mL Show less