scholarly journals Rapid and Simultaneous Determination of Free Aromatic Carboxylic Acids and Phenols in Commercial Juices by GC-MS after Ethyl Chloroformate Derivatization

Separations ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 9
Author(s):  
Alessio Incocciati ◽  
Elisa Di Fabio ◽  
Alberto Boffi ◽  
Alessandra Bonamore ◽  
Alberto Macone
Keyword(s):  
Carboxylic Acids ◽  
Total Concentration ◽  
Aqueous Media ◽  
Ethyl Chloroformate ◽  
Aromatic Carboxylic Acids ◽  
Beneficial Effects ◽  
Accuracy And Precision ◽  
Extraction Step ◽  
Derivatizing Agent

Natural phenol and phenolic acids are widely distributed in the plant kingdom and the major dietary sources include fruits and beverages derived therefrom. Over the past decades, these compounds have been widely investigated for their beneficial effects on human health and, at the same time, several analytical methods have been developed for their determination in these matrices. In the present paper, 19 different aromatic carboxylic acids and phenols were characterized by GC-MS using ethyl chloroformate as the derivatizing agent. This procedure occurs quickly at room temperature and takes place in aqueous media simultaneously with the extraction step in the presence of ethanol using pyridine as a catalyst. The analytical method herein developed and validated presents excellent linearity in a wide concentration range (25–3000 ng/mL), low LOQ (in the range 25–100 ng/mL) and LOD (in the range 12.5–50 ng/mL), and good accuracy and precision. As a proof of concept, ethyl chloroformate derivatization was successfully applied to the analysis of a selection of commercial fruit juices (berries, grape, apple, pomegranate) particularly rich in phenolic compounds. Some of these juices are made up of a single fruit, whereas others are blends of several fruits. Our results show that among the juices analyzed, those containing cranberry have a total concentration of the free aromatic carboxylic acids and phenols tested up to 15 times higher than other juices.

Application of flow-injection potentiometric system for determination of total concentration of aliphatic carboxylic acids

Talanta ◽  
2011 ◽  
Vol 85 (4) ◽  
pp. 2047-2052 ◽  
Author(s):  
Monika Mroczkiewicz ◽  
Łukasz Górski ◽  
Anna Zamojska-Jaroszewicz ◽  
Krzysztof W. Szewczyk ◽  
Elżbieta Malinowska
Keyword(s):  
Carboxylic Acids ◽  
Flow Injection ◽  
Total Concentration ◽  
Aliphatic Carboxylic Acids

scholarly journals Test means for separate and total determination of heavy metals in aqueous media

2019 ◽  
Vol 57 (1) ◽  
pp. 101-114
Author(s):  
Marina K. Gabidulina ◽  
◽  
Sergey Yu. Doronin ◽  
Irina V. Kosyreva ◽  
◽  
...  
Keyword(s):  
Heavy Metals ◽  
Total Concentration ◽  
Aqueous Media ◽  
Natural Fibers ◽  
Polymeric Materials ◽  
Petroleum Products ◽  
Test Methods ◽  
Test Tube ◽  
Silica Gels

The classification of the main indicators of the quality of water bodies is considered. The data on controlled chemical indicators are given (content of dissolved oxygen, suspended solids, phenols, petroleum products, etc.) A list of priority hydrochemical water pollutants and the sources of their pollution are presented. The expediency of determining both individual ions of heavy metals (HM) and their complex (integral) indicators is shown by the example of the sum of HMs. The authors summarized existing data on contemporary test methods used for detection and quantitative measurement of the most prominent HM pollutants of aqueous media, namely – Fe(II), Fe(III), Co(II), Ni(II), Cu(II), Mn(II) and Al(III) ions. Concentration of such HM ions can be evaluated by various test means such as indicator papers, detector tubes and polymer plates etc. The main matrices of the test means are considered: cellulose papers, fabrics from artificial and natural fibers, silica gels, xerogels, polymeric materials, etc. The conditions for immobilization and modification of test means (carrying agent, reagent, surfactant, etc.) and principles of analyte determination using the developed test tools (visual and instrumental assessment of the intensity of staining of test forms, determination of the length of staining or bleaching of test tube zones, etc.), as well as some metrological characteristics (detection limit, range of determined contents, relative errors of definitions, etc.) are shown in this article. Detection limits of studied heavy metal ions in aqueous media that can be achieved with proposed test means are as follows: Fe(II) – (0.005-0.01) mg/l; Fe(III) – 0.1 mg/l; Co(II) – (0.02-0.4) mg/l; Ni(II) – (0.1-10) mg/l; Cu(II) – 0.05 mg/l; Mn(II) – 0.03 mg/l; Al(III) – 0.02 mg/l; total concentration of several HM ions – (0.0005-0.001) mg/l.

A Convenient Method for One Step Oxidative Decarboxylation by KMnO4 in Non Aqueous Media

2000 ◽  
Vol 2000 (3) ◽  
pp. 148-149 ◽  
Author(s):  
Shahram Mehdipour Ataei
Keyword(s):  
Carboxylic Acids ◽  
Potassium Permanganate ◽  
Efficient Method ◽  
Convenient Method ◽  
Aqueous Media ◽  
Oxidative Decarboxylation ◽  
Aromatic Carboxylic Acids ◽  
One Step

A simple and efficient method for one step oxidative decarboxylation of some aromatic carboxylic acids, using potassium permanganate in non-aqueous media is described.

scholarly journals Ethylchloroformate Derivatization for GC–MS Analysis of Resveratrol Isomers in Red Wine

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4603
Author(s):  
Elisa Di Fabio ◽  
Alessio Incocciati ◽  
Federica Palombarini ◽  
Alberto Boffi ◽  
Alessandra Bonamore ◽  
...  
Keyword(s):  
Red Wine ◽  
Extraction Process ◽  
Human Diet ◽  
Beneficial Effects ◽  
Accuracy And Precision ◽  
High Concentrations ◽  
Cis And Trans ◽  
Further Development ◽  
Selection Of

Resveratrol (3,5,4′-trihydroxystilbene) is a natural compound that can be found in high concentrations in red wine and in many typical foods found in human diet. Over the past decades, resveratrol has been widely investigated for its potential beneficial effects on human health. At the same time, numerous analytical methods have been developed for the quantitative determination of resveratrol isomers in oenological and food matrices. In the present work, we developed a very fast and sensitive GC–MS method for the determination of resveratrol in red wine based on ethylchloroformate derivatization. Since this reaction occurs directly in the water phase during the extraction process itself, it has the advantage of significantly reducing the overall processing time for the sample. This method presents low limits of quantification (LOQ) (25 ng/mL and 50 ng/mL for cis- and trans-resveratrol, respectively) and excellent accuracy and precision. Ethylchloroformate derivatization was successfully applied to the analysis of resveratrol isomers in a selection of 15 commercial Italian red wines, providing concentration values comparable to those reported in other studies. As this method can be easily extended to other classes of molecules present in red wine, it allows further development of new GC–MS methods for the molecular profiling of oenological matrices.

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