Fabrication of porous covalent organic frameworks as selective and advanced adsorbents for the on-line preconcentration of trace elements against the complex sample matrix

2018 ◽  
Vol 344 ◽  
pp. 220-229 ◽  
Author(s):  
Jing-Min Liu ◽  
Xing-Zhi Wang ◽  
Chao-Yue Zhao ◽  
Jia-Li Hao ◽  
Guo-Zhen Fang ◽  
...  
Keyword(s):  
Trace Elements ◽  
Covalent Organic Frameworks ◽  
Sample Matrix ◽  
Complex Sample ◽  
On Line

scholarly journals Quantification of Fructans in Bioethanol Stillage Based On a Simplified Analytical Method

2021 ◽  
Author(s):  
Andreas Zimmermann ◽  
Martin Kaltschmitt
Keyword(s):  
Analytical Method ◽  
Measurement Errors ◽  
Process Development ◽  
Stationary Phases ◽  
New Approach ◽  
Sample Matrix ◽  
Sample Throughput ◽  
Complex Sample ◽  
Potential Substrate

Abstract Bioethanol stillage, the main by-product of industrial bioethanol production, is a potential substrate for fructans. However, the determination and quantification of fructans in such complex sample matrices is still a challenge for the corresponding analytics to be overcome in order to allow for the identification and utilisation of such unused fructan sources. Especially a possible utilisation or rather the corresponding process development requires appropriate analytics first. Thus, this paper aims to illuminate the basics of fructan quantification in stillage and the corresponding challenges particularly arising with widely used HPLC-RID systems. On this basis, a new approach for fructan quantification is presented based on such HPLC-RID systems allowing for a reliable and especially simple fructan determination in bioethanol stillage for comparably high sample throughput. The developed method performs fructan quantification by determination of fructose and glucose equivalents after a targeted acidic hydrolysis adapted to the respective sample matrix. By means of two different stationary phases, the problem of limited resolution in case of HPLC-RID is overcome and thus measurement errors are reduced. The approach towards the adapted analytical method can be transferred easily to comparable complex sample matrices.

scholarly journals Determination of Four Fluoroquinolones in Milk by On-Line Immunoaffinity Capture Coupled with Reversed-Phase Liquid Chromatography

1999 ◽  
Vol 82 (3) ◽  
pp. 607-613 ◽  
Author(s):  
Carol K Holtzapple ◽  
Sandra A Buckley ◽  
Larry H Stanker
Keyword(s):  
Raw Milk ◽  
Reversed Phase ◽  
Immunoaffinity Column ◽  
Isocratic Elution ◽  
Reversed Phase Liquid Chromatography ◽  
Sample Matrix ◽  
On Line ◽  
Phase Liquid ◽  
Liquid Chromatographic

Abstract An automated, on-line immunoaffinity extraction method was developed for the analysis of 4 fluoroquinolones in milk: ciprofloxacin, difloxacin, enrofloxacin, and sarafloxacin. This method involves analyte extraction using an immunoaffinity capture column containing anti-fluoroquinolone antibodies coupled on-line with reversed-phase column chromatography. Liquid chromatographic analyses were performed by isocratic elution using a mobile phase of 2% acetic acid-acetonitrile (85 + 15) and an Inertsil phenyl column with fluorescence detection at excitation and emission wavelengths of 278 and 444 nm, respectively. No significant interferences from the sample matrix were observed, indicating good selectivity with the immunoaffinity column. Recoveries from fortified raw milk samples (5–50 ppb of each fluoroquinolone) ranged from 72 to 90%, with standard deviations of ≤8%.

scholarly journals Recent Materials Developed for Dispersive Solid Phase Extraction

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4869
Author(s):  
Piotr Ścigalski ◽  
Przemysław Kosobucki
Keyword(s):  
Solid Phase Extraction ◽  
Analytical Procedure ◽  
Solid Phase ◽  
Phase Extraction ◽  
Dispersive Solid Phase Extraction ◽  
High Effectiveness ◽  
Sample Matrix ◽  
Complex Sample ◽  
Qualitative Determination ◽  
Analytical Equipment

Solid phase extraction (SPE) is an analytical procedure developed with the purpose of separating a target analyte from a complex sample matrix prior to quantitative or qualitative determination. The purpose of such treatment is twofold: elimination of matrix constituents that could interfere with the detection process or even damage analytical equipment as well as enriching the analyte in the sample so that it is readily available for detection. Dispersive solid phase extraction (dSPE) is a recent development of the standard SPE technique that is attracting growing attention due to its remarkable simplicity, short extraction time and low requirement for solvent expenditure, accompanied by high effectiveness and wide applicability. This review aims to thoroughly survey recently conducted analytical studies focusing on methods utilizing novel, interesting nanomaterials as dSPE sorbents, as well as known materials that have been only recently successfully applied in dSPE techniques, and evaluate their performance and suitability based on comparison with previously reported analytical procedures.

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