Selective microextraction of mononucleotides from milk using alumina and stannia hollow fibers prior to their determination by hydrophilic interaction liquid chromatography–diode array detection

Sfakianaki, Afroditi; Stalikas, Constantine D.

doi:10.1016/j.foodchem.2015.03.074

Cited by 9 publications

(7 citation statements)

References 30 publications

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“…Moreover, PDMS/DVB and CAR/PDMS fibers revealed, correspondingly, 14 and 21 peaks on their respective chromatograms and showed adsorbed distinctive compounds. Consistent with the manufacturer, CAR/PDMS coating is more suitable for low molecular weight compounds detection (e.g., 2-butanone or acetone), while PDMS/DVB absorbs higher molecular weight compounds (e.g., nonanal or decanal) [18]. In the present work, the lowest molecular weight compound detected was 3-methylbutanal, and the highest one was heptanal.…”

Section: Optimization Of Spme Experimental Conditionssupporting

confidence: 80%

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Measurement of Off-Flavoring Volatile Compounds and Microbial Load as a Probable Marker for Keeping Quality of Pasteurized Milk

et al. 2019

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(1) Background: Multiple attempts have been conducted to correlate milk keeping quality with chemical, physical or bacteriological parameters. These methods only measure the chemical changes in milk produced by bacteria. Headspace solid-phase micro-extraction (HS-SPME) is an economic and recent method used to measure both volatile compounds and microbial load in milk, also allowing to keep the quality of the milk product. (2) Methods: The present study was conducted to identify and measure the off-flavoring volatile compounds through gas chromatography coupled with flame ionization detector (GC-FID) and the microbial load of pasteurized fluid milk stored at different temperatures, as a possible indicator of its keeping quality. (3) Results: The highest results were obtained to acetone, followed by butanone, pentanal and ethanol. These mean values were significantly enhanced from the 0 to 19th day of storage, at 10 °C. At day 19th, the minimum score for aroma, flavor and overall acceptability were also recorded as 4.33 ± 0.17, 4.02 ± 0.06, 4.00 ± 0.04, respectively. Likewise, maximum values for standard plate count (Log10 CFU 15.54 ± 0.40 mL−1) and total psychotroph count (Log10 CFU 11.67 ± 0.30mL−1) were reported at 10 °C and 4 °C. (4) Conclusion: HS-SPME/GC-FID methodology revealed to be very sensitive and capable to be applied in volatile compounds quantification in pasteurized milk produced during the storage period at different temperatures.

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Section: Optimization Of Spme Experimental Conditionssupporting

confidence: 80%

“…Samples were transferred, under sterilized conditions, to a 250 mL plastic vessel. A total of 30 samples were stored at 4, 7 and 10 • C for 19 days with a time interval of 0, 1,5,9,12,14,16,17,18, and 19 days, for further analysis.…”

Section: Samples and Storage Conditionsmentioning

confidence: 99%

Measurement of Off-Flavoring Volatile Compounds and Microbial Load as a Probable Marker for Keeping Quality of Pasteurized Milk

et al. 2019

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“…A novel procedure has been described in the extraction and preconcentration of nucleotides from samples of infant formulas and human milk; in which selective micro-extraction is carried out using alumina and stannia hollow fibres, previously precipitating the proteins in an acidic medium [64]. Alumina-and stannia-based hollow fibres were synthesized via solegel procedures and the micro-extraction of NMPs takes place owing to the high affinity of phosphorylated species for metal oxides.…”

Section: Sample Treatmentmentioning

confidence: 99%

“…In recent years, the use of HILIC [73e75] has become very important in the separation of these polar analytes [19,29,31,42,47,64,65]. Partitioning between the aqueous layer associated with the stationary phase and the organic component of the mobile phase is the main retention mechanism in HILIC, Other abbreviations as in Tables 3 and 2 a…”

Section: Liquid Chromatographymentioning

confidence: 99%

Determination of nucleosides and nucleotides in food samples by using liquid chromatography and capillary electrophoresis

Domínguez‐Álvarez

Mateos-Vivas

Rodríguez‐Gonzalo

et al. 2017

TrAC Trends in Analytical Chemistry

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“…In this mode, a commercial polypropylene HF is used as supporter for extraction solvents, in which extraction solvents are hold in the wall pores and lumen of HF, thus improving the stability of microdroplets and further the extraction efficiency (Pedersen-Bjergaard & Rasmussen, 1999). More importantly, HF itself could provide excellent sample cleanup effect due to the specific size of micropores in the wall excluding large molecules and particles, which is rather applicable to various complicated matrix samples (Huang, Chen, Gjelstad, Pedersen-Bjergaard, & Shen, 2017;Li et al, 2016;Sfakianaki & Stalikas, 2015). Thus, since its appearance, HF-LPME has been frequently used for the determination of pesticides in various matrices.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pesticide Residue in Tomatoes by Carbon Nanotubes/β‐Cyclodextrin Nanocomposite Reinforced Hollow Fiber Coupled with HPLC

Ding

Song

Chen

2019

Journal of Food Science

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For addressing the issues of pesticide residue analysis characterized by the trace levels of target analytes and the complexity of sample matrices, a selective extracting material, carbon nanotubes (CNTs)/β‐cyclodextrin (β‐CD) nanocomposite reinforced hollow fiber (HF), was developed. CNTs were chemically modified with β‐CD and then the resultant nanocomposite was immobilized into the wall pores and lumen of HF by sol‐gel technology. The reinforced HF was applied to direct‐immersion mode of solid phase microextraction for the determination of carbaryl and 1‐naphthol in tomatoes, coupled with high performance liquid chromatography. The proposed method provided 240‐ and 215‐fold enrichment factors, good linearity in the range of 0.6 to 600 ng/g and 0.2 to 600 ng/g, good repeatability with RSDs of 4.5% and 6.9%, and batch‐to‐batch reproducibility with RSDs of 7.4% and 8.3% for 1‐naphthol and carbaryl, respectively. Moreover, the low limits of detection at 0.05 and 0.15 ng/g for 1‐naphthol and carbaryl, respectively, along with the high recovery in the range of 84.2% to 108.9% were obtained. The results showed that the material combined the respective advantages of CNTs, β‐CD, and HF, thus, exhibiting efficient adsorption property, outstanding molecular recognition performance, and excellent sample clean‐up effect, and it is applicable for pesticide residue analysis in complex matrices. Practical Application The developed extracting material can be used for pesticide residue analysis of tomatoes. Pesticides, carbaryl, and 1‐naphthol were detected in tomatoes, the most popular vegetable grown and consumed globally. The results supported the necessity to monitor pesticide residue for public health.

show abstract

Selective microextraction of mononucleotides from milk using alumina and stannia hollow fibers prior to their determination by hydrophilic interaction liquid chromatography–diode array detection

Cited by 9 publications

References 30 publications

Measurement of Off-Flavoring Volatile Compounds and Microbial Load as a Probable Marker for Keeping Quality of Pasteurized Milk

Measurement of Off-Flavoring Volatile Compounds and Microbial Load as a Probable Marker for Keeping Quality of Pasteurized Milk

Determination of nucleosides and nucleotides in food samples by using liquid chromatography and capillary electrophoresis

Analysis of Pesticide Residue in Tomatoes by Carbon Nanotubes/β‐Cyclodextrin Nanocomposite Reinforced Hollow Fiber Coupled with HPLC

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