Evaluation of an HPIC Method for Determination of Nitrates in Vegetables

Hegedűs, Ondrej; Hegedüsová, Alžbeta; Jakabová, Silvia; Vargová, Andrea; Pernyeszi, Tı́mea; Boros, B

doi:10.1365/s10337-010-1595-9

Cited by 7 publications

(6 citation statements)

References 27 publications

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“…the determination of nitrate in foodstuffs [20,21]. An UV-Vis spectroscopic method, either based on deconvolution of UV spectra of a number of references to reconstitute the UV spectrum of an unknown sample to determine nitrate concentration or based on the quantitative reaction of nitrate with 2-sec-butylphenol to form a yellow complex in alkaline medium which has maximum absorbance at 418 nm has also been used [22,23].…”

Section: Introductionmentioning

confidence: 99%

A Simple Electrochemical Method for Nitrate Determination in Leafy Vegetables

Huang¹,

Samuel²,

Willis³

2019

J Hum Nutr

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Section: Introductionmentioning

confidence: 99%

A Simple Electrochemical Method for Nitrate Determination in Leafy Vegetables

Huang¹,

Samuel²,

Willis³

2019

J Hum Nutr

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“…Based on the fact, that the AA content was calculated from the calibration curve, we evaluated the linearity of the calibration dependence in the range of use for the analysis of agricultural products [34]. The linearity of the method is guaranteed in the whole range of the calibration curve ( fig.…”

Section: Resultsmentioning

confidence: 99%

“…The results of the analyses were statistically processed and the validation parameters calculated by the work Hegedûs, et al [34]. We describe the reliability of the method in the following parameters:…”

Section: Validation Of the Methodsmentioning

confidence: 99%

Validation and Quality Assurance of Ascorbic Acid Determination in Agricultural Products

Hegedűs¹,

Szarka²,

Hegedüsová³

et al. 2019

Rev. Chim.

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The study describes a method for the determination of ascorbic acid (AA) with the technique of high performance liquid chromatography with UV detection (UV-HPLC) modified for routine analysis of agricultural products. For successful use of the method in the test laboratory practice, the reliability of using this method has been confirmed by validation. The repeatability of method has been observed, which is 2.80 - 5.55% for the various crops. Relative combined standard uncertainty has a value of 6.2%. The accuracy of the method is 103.2% and calculated as recovery of the standard addition. The value of the LOQ computed from the upper limit of reliability is 26.7 mg kg-1, which ensures safe determination of AA in every major agricultural crop.

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“…All calculated validation characteristics were summarized in the Excel table and the final evaluation of the method. Calculation of the validation characteristics was performed according to a previously published work [30]. The analytical method was validated for the purpose of the laboratory of the Regional Authority of Public Health in Nitra, Slovak Republic.…”

Section: Validation and Verification Of The Methodsmentioning

confidence: 99%

Determination of Isocyanates in Workplace Atmosphere by HPLC

Hegedűs¹,

Smotlakova²,

Hegedüsová³

et al. 2018

Rev. Chim.

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Determination of diisocyanates in the laboratories of the Authorities of Public Health was described and verified. Air samples collected in the breathing zone of workers exposed to diisocyanates were analyzed in an automotive industry. Diisocyanates (2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4�-methylenediphenyl isocyanate, and 1,6-hexamethylene diisocyanate) were measured by HPLC and the validation characteristics were determined. Diisocyanate exposure was monitored in the workplace atmosphere of 25 workers. Air samples from the breathing zone were collected and analyzed by HPLC after extraction. The results were compared to the occupational exposure limit. Reliability of the method was confirmed by validation characteristics for the diisocyanates. The repeatability of the method ranged from 2.98 to 4.51%, the calculated relative standard uncertainty was 11 � 12% for the parameters, and the recovery was between 99 and 103%. The low LOD and LOQ ensured the determination of the diisocyanates in the harmful concentration. Monitoring of diisocyanate exposure was performed on four different workplaces. The results showed that 2,4-toluene diisocyanate and 2,6-toluene diisocyanate were present in the concentration range from 6.3 to 13.2 �g m-3. The 1,6-hexamethylene diisocyanate was found in all cases below the limit of detection and the 4,4�-methylenediphenyl isocyanate was found only at two workplaces (between 8.3 and 44.8 �g m-3). The HPLC method was found to be appropriate for the determination of diisocyanates. Applying the method for the determination of diisocyanate exposure in four different workplaces, which produce car accessories, showed that the diisocyanate level did not exceed the occupational exposure limit set for average exposure.

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Evaluation of an HPIC Method for Determination of Nitrates in Vegetables

Cited by 7 publications

References 27 publications

A Simple Electrochemical Method for Nitrate Determination in Leafy Vegetables

A Simple Electrochemical Method for Nitrate Determination in Leafy Vegetables

Validation and Quality Assurance of Ascorbic Acid Determination in Agricultural Products

Determination of Isocyanates in Workplace Atmosphere by HPLC

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