Modified μ-QuEChERS coupled to diethyl carbonate-based liquid microextraction for PAHs determination in coffee, tea, and water prior to GC–MS analysis: An insight to reducing the impact of caffeine on the GC–MS measurement

El-Deen, Asmaa Kamal; Shimizu, Kuniyoshi

doi:10.1016/j.jchromb.2021.122555

Cited by 24 publications

(11 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the roasting process the caffeine content increases to 1.7% to 1.9% (an increase of 10%-15% of initial weight). Caffeine is a compound that is stable on heating (roasting process up to 210℃) because of the high boiling point of caffeine [16], so that there is no change in levels during the roasting process. The increase in caffeine levels occurs because in the roasting process there is a loss of coffee mass.…”

Section: Caffeine Contentmentioning

confidence: 99%

Effect of Fruit Ripening Level and Roasting Temperature on Robusta Coffee Bean Quality

Muhari

Sihombing

Sarungu

et al. 2023

IJATR

View full text Add to dashboard Cite

The purpose of this study is to determine the effect of roasting temperature on the chemical content of Robusta coffee at various levels of Robusta coffee maturity. The research will be conducted at roasting temperatures of 190℃, 200℃, 210℃, 220℃ and chemical content analysis is carried out bygravimetric method and UV-VIS spectrophotometry on fresh beans, green beans and coffee beans at each temperature variation and the maturity level of Robusta coffee. Maturity of coffee beans will be classified visually and use an RGB meter to help and facilitate the selection of coffee beans in accordance with the level of maturity. The variables taken and observed in the study are the temperature of the roasting process, the time required at the time of roasting, as well as the mass, chemical content and physical parameters of robusta coffee beans observed before and after the roasting process. Chemical content was observed in the form of water content, fat content, caffeine, and antioxidants, then the physical parameters observed were aroma, color, shape, taste, and characteristics of coffee beans at each level of robusta coffee fruit maturity. The results obtained value of the chemical content and organoleptic test at each level of maturity of the coffee fruit and roasting temperature variations because basically the roasting temperature will produce coffee beans that have their own characteristics and flavors. This study also determines the value of the mass transfer coefficient and heat transfer in the drying process by the roasting method.

show abstract

Section: Caffeine Contentmentioning

confidence: 99%

Effect of Fruit Ripening Level and Roasting Temperature on Robusta Coffee Bean Quality

Muhari

Sihombing

Sarungu

et al. 2023

IJATR

View full text Add to dashboard Cite

show abstract

“…The volume of the extracting solvent must also be optimized. An increase in the volume of the extracting solvent corresponds to an increase in the amount of extracted analytes, which, in turn, increases the % recovery [ 38 ]. This increase in % recovery, however, is deceptive since the enrichment factor (EF) will drop.…”

Section: Dess In Dllme-sfodmentioning

confidence: 99%

“…However, intriguing solutions to similar challenges have been revealed. Dispersers can be replaced by greener deep eutectic solvents [ 33 ], surfactants can act as dispersers, or the process can be conducted through several mechanical dispersion methods such as ultrasound [ 49 ], vortex [ 72 ], air [ 38 ], or magnetic stirring. On the other hand, the extensive application of DLLME-SFOD has raised the necessity to fully automate the extraction process.…”

Section: Challenges and Future Perspectivesmentioning

confidence: 99%

Deep Eutectic Solvents as Promising Green Solvents in Dispersive Liquid–Liquid Microextraction Based on Solidification of Floating Organic Droplet: Recent Applications, Challenges and Future Perspectives

El-Deen

Shimizu

2021

Molecules

Self Cite

View full text Add to dashboard Cite

Deep eutectic solvents (DESs) have recently attracted attention as a promising green alternative to conventional hazardous solvents by virtue of their simple preparation, low cost, and biodegradability. Even though the application of DESs in analytical chemistry is still in its early stages, the number of publications on this topic is growing. Analytical procedures applying dispersive liquid–liquid microextraction based on the solidification of floating organic droplets (DLLME-SFOD) are among the more appealing approaches where DESs have been found to be applicable. Herein, we provide a summary of the articles that are concerned with the application of DESs in the DLLME-SFOD of target analytes from diverse samples to provide up-to-date knowledge in this area. In addition, the major variables influencing enrichment efficiency and the microextraction mechanism are fully investigated and explained. Finally, the challenges and future perspectives of applying DESs in DLLME-SFOD are thoroughly discussed and are critically analyzed.

show abstract

“…Moreover, stages such as separation and preconcentration of the analytes are needed before the detection, depending on the sample to be analyzed [29,30]. Similar methodologies have been employed for determining CZL and derivatives, such as GC-MS [31][32][33][34], liquid chromatography with UV or Fluorescence detection (LC-UV and LC-F) [27]. Other methodologies with F [35] or room temperature phosphorescence (RTP) also exist [36].…”

Section: Introductionmentioning

confidence: 99%

Calixarenes and cyclodextrins as off- and on-fluorescence probes for carbazole

Carranza,

Elero,

Hernández

et al. 2024

Methods Appl. Fluoresc.

View full text Add to dashboard Cite

Absorption and fluorescence spectra of the nitrogen polycyclic aromatic hydrocarbon carbazole (CZL) were analyzed with native cyclodextrins (CD; α,β,γ); derivatized CD (hydroxypropyl-β-cyclodextrin, HPCD; methyl-β-cyclodextrin, MeCD) and p-sulfonated calixarenes (SCAn, with n= 6 and 8) macrocycles. The results showed a slight increase in the absorbance of CZL with CD, but the mixture of CZL with SCA showed lower absorption than the sum of the individual spectra. Also, changes in fluorescence were observed by adding the macrocycles, quenching with SCA, and significant increases with CD. The higher fluorescence enhancement was with HPCD rationalized as a complex formation with 1:1 stoichiometry, with an average value for the association constant (KA) of (12 ± 1) x 102 M-1, and a quantum yield ratio between the complexed CZL and free CZL (ΦCZL-HPCD/ΦCZL) of (1.56 ± 0.02) at neutral pH and 25.0 °C. These increases in fluorescence were used as an on-fluorescence switch to develop a supramolecular analytical method for CZL in aqueous samples. The best analytical parameters were in HPCD (LOD= 1.41±0.01 ng/mL). The method was validated in aqueous samples of river and tap water with recoveries between 96-104%. The proposed supramolecular method is quick, direct, selective and represents an alternative and low-cost analysis method.

show abstract

Modified μ-QuEChERS coupled to diethyl carbonate-based liquid microextraction for PAHs determination in coffee, tea, and water prior to GC–MS analysis: An insight to reducing the impact of caffeine on the GC–MS measurement

Cited by 24 publications

References 51 publications

Effect of Fruit Ripening Level and Roasting Temperature on Robusta Coffee Bean Quality

Effect of Fruit Ripening Level and Roasting Temperature on Robusta Coffee Bean Quality

Deep Eutectic Solvents as Promising Green Solvents in Dispersive Liquid–Liquid Microextraction Based on Solidification of Floating Organic Droplet: Recent Applications, Challenges and Future Perspectives

Calixarenes and cyclodextrins as off- and on-fluorescence probes for carbazole

Contact Info

Product

Resources

About