Matrix solid-phase dispersion extraction and determination by high-performance liquid chromatography with fluorescence detection of residues of glyphosate and aminomethylphosphonic acid in tomato fruit

Llasera, Martha Patricia García de; Gómez-Almaraz, L.; Vera-Avila, Luz E.; Peña-Álvarez, Araceli

doi:10.1016/j.chroma.2005.07.063

Cited by 50 publications

(20 citation statements)

References 29 publications

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“…For these reasons, chemical derivatization or labeling becomes a necessary procedure to transform the analytes into derivatives that can be more easily isolated, separated and detected [19]. Thus for sensitive determination of glyphosate, many derivatization agents have been developed including 4-chloro-7-nitrobenzofurazan (NBD-Cl) [20], 2,2-dihydroxy-1h-indene-1,3-(2h)-dione (Ninhydrin) [21][22][23], lfluoro-2,4-dinitrobenzene (DNP) [24], 9-fluorenylmethyl chloroformate (FMOC-Cl) [25][26][27][28][29][30][31][32][33][34], o-phthalaldehyde-mercaptoethanol (OPA-MERC) [35,36], p-toluenesulphonyl chloride (TsCl) [37,38]. 4-Chloro-3,5-dinitrobenzotrifluoride (CNBF) is an important fine chemical, which has been known to react with primary or secondary amines in presence of base to produce stable N-substituted-2,6-dinitro-4-(trifluoromethyl)-benzamine derivatives which are satisfactory ultraviolet absorption [39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Residue determination of glyphosate in environmental water samples with high-performance liquid chromatography and UV detection after derivatization with 4-chloro-3,5-dinitrobenzotrifluoride

Qian

Tang

Shi

et al. 2009

Analytica Chimica Acta

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Section: Introductionmentioning

confidence: 99%

Residue determination of glyphosate in environmental water samples with high-performance liquid chromatography and UV detection after derivatization with 4-chloro-3,5-dinitrobenzotrifluoride

Qian

Tang

Shi

et al. 2009

Analytica Chimica Acta

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“…In recent years, as glyphosate has been broadly used for controlling weeds in orchards, the problem of glyphosate residues in fruits has become increasingly serious. Determination methods have been reported for orange juice [9] and tomatoes [10]. However, there is a distinct lack of information in the literature about glyphosate residue in apple as one of the world's favorite fruits.…”

Section: Introductionmentioning

confidence: 98%

Solid‐phase extraction and residue determination of glyphosate in apple by ion‐pairing reverse‐phase liquid chromatography with pre‐column derivatization

Qian

Tang

Shi

et al. 2009

J of Separation Science

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A new method for glyphosate residue determination in apple has been developed. A SPE cartridge was used to clean up the samples before derivatization. Glyphosate was derivatized with 4-chloro-3,5-dinitrobenzotrifluoride (CNBF) and quantified by reverse ion-pair liquid chromatography using cetyltrimethylammonium bromide (CTAB) as ion-pair reagent. In pH 9.5 H(3)BO(3)-Na(2)B(4)O(7) medium, the reaction of glyphosate with CNBF was complete after 30 min at 60 degrees C. The stability of the derivative on exposure to light at room temperature in methanol-water was demonstrated. The labeled glyphosate was separated on a Kromasil C(18) column (250 x 4.6 mm, 5 microm) at room temperature and UV detection was applied at 360 nm. Separation was achieved within 15 min in gradient elution mode. The correlation coefficient for the method was 0.9998 at concentrations ranging from 0.1 to 50 microg/g. The calculated recoveries for glyphosate in apple were from 86.00 to 99.55%, and the relative standard deviations (n = 6) were from 1.43 to 6.32. The limit of detection was 0.01 microg/g for glyphosate in apple.

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“…In the literature, several works can be found that develop methodologies for glyphosate detection. Most of these studies are based on chromatographic techniques using either gas [8,9] or liquid chromatography (HPLC) [10–13]. In the case of the studies using HPLC chromatography, the reached limits of detection were in the range of μg/mL when the sample was conditioned by pre- or post-column derivatization protocols and coupled to mass analysis (HPLC/MS/MS).…”

Section: Introductionmentioning

confidence: 99%

Glyphosate Detection by Means of a Voltammetric Electronic Tongue and Discrimination of Potential Interferents

Bataller

Campos

Laguarda-Miró

et al. 2012

Sensors

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A new electronic tongue to monitor the presence of glyphosate (a non-selective systemic herbicide) has been developed. It is based on pulse voltammetry and consists in an array of three working electrodes (Pt, Co and Cu) encapsulated on a methacrylate cylinder. The electrochemical response of the sensing array was characteristic of the presence of glyphosate in buffered water (phosphate buffer 0.1 mol·dm−3, pH 6.7). Rotating disc electrode (RDE) studies were carried out with Pt, Co and Cu electrodes in water at room temperature and at pH 6.7 using 0.1 mol·dm−3 of phosphate as a buffer. In the presence of glyphosate, the corrosion current of the Cu and Co electrodes increased significantly, probably due to the formation of Cu2+ or Co2+ complexes. The pulse array waveform for the voltammetric tongue was designed by taking into account some of the redox processes observed in the electrochemical studies. The PCA statistical analysis required four dimensions to explain 95% of variance. Moreover, a two-dimensional representation of the two principal components differentiated the water mixtures containing glyphosate. Furthermore, the PLS statistical analyses allowed the creation of a model to correlate the electrochemical response of the electrodes with glyphosate concentrations, even in the presence of potential interferents such as humic acids and Ca2+. The system offers a PLS prediction model for glyphosate detection with values of 098, −2.3 × 10−5 and 0.94 for the slope, the intercept and the regression coefficient, respectively, which is in agreement with the good fit between the predicted and measured concentrations. The results suggest the feasibility of this system to help develop electronic tongues for glyphosate detection.

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Matrix solid-phase dispersion extraction and determination by high-performance liquid chromatography with fluorescence detection of residues of glyphosate and aminomethylphosphonic acid in tomato fruit

Cited by 50 publications

References 29 publications

Residue determination of glyphosate in environmental water samples with high-performance liquid chromatography and UV detection after derivatization with 4-chloro-3,5-dinitrobenzotrifluoride

Residue determination of glyphosate in environmental water samples with high-performance liquid chromatography and UV detection after derivatization with 4-chloro-3,5-dinitrobenzotrifluoride

Solid‐phase extraction and residue determination of glyphosate in apple by ion‐pairing reverse‐phase liquid chromatography with pre‐column derivatization

Glyphosate Detection by Means of a Voltammetric Electronic Tongue and Discrimination of Potential Interferents

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