scholarly journals Pipette Tip Solid-Phase Extraction Combined with Fluorescence Spectroscopy for Determination of Selenium in Green Tea Samples

2021 ◽  
Vol 913 (1) ◽  
pp. 012064
Author(s):  
S R Kamali ◽  
C H Tsai ◽  
C N Chen
Keyword(s):  
Solid Phase Extraction ◽  
Green Tea ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Standard Addition ◽  
Phase Extraction ◽  
Addition Method ◽  
The Matrix ◽  
Pipette Tip

Abstract In this study, the custom-built pipette-tip solid phase extraction (PT-SPE), was used for pre-concentrating the selenium (Se) in green tea samples. The PT-SPE was prepared using a pipette tip and C18 as the adsorbent that was placed between glass wool. This method afforded several advantages in terms of efficiency of extraction time (8 min), sample (2 mL), and solvent (1 mL) volumes with less wastage of solvent. Under optimal conditions of extraction, this method yielded good linearity (r2=0.998) for the Se calibration curve and good limit of detection (0.2 μg/L) and quantification (0.6 μg/L). The standard addition method was used to remove the matrix effect. The recovery percentages of tea samples spiked with different Se concentrations ranged from 97.7 to 106.0%, indicating that the proposed method would be suitable for the determination of Se in green tea samples.

Hollow mesoporous structured molecularly imprinted polymer as adsorbent in pipette-tip solid-phase extraction for the determination of antiretrovirals from plasma of HIV-infected patients

2018 ◽  
Vol 39 (20) ◽  
pp. 2581-2589 ◽  
Author(s):  
Nathália Soares Simões ◽  
Hanna Leijoto de Oliveira ◽  
Ricky Cássio Santos da Silva ◽  
Leila Suleimara Teixeira ◽  
Thaís Lorenna Souza Sales ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Molecularly Imprinted Polymer ◽  
Solid Phase ◽  
Phase Extraction ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Pipette Tip

Spectrofluorometrical Determination of Vitamin B 1 in Different Matrices Using Box‐Behnken Designed Pipette Tip Solid Phase Extraction by a Carbon Nanotube Sorbent

2019 ◽  
Vol 4 (11) ◽  
pp. 3052-3057 ◽  
Author(s):  
Sayyed Hossein Hashemi ◽  
Hossein Yahyavi ◽  
Massoud Kaykhaii ◽  
Mohammad Hashemi ◽  
Majid Mirmoghaddam ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Vitamin B ◽  
Phase Extraction ◽  
Pipette Tip

scholarly journals Spectrophotometric Determination of Iron(II) after Solid Phase Extraction of Its 2,2′ Bipyridine Complex on Silica Gel-Polyethylene Glycol

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Nahid Pourreza ◽  
Saadat Rastegarzadeh ◽  
Ali Reza Kiasat ◽  
Hossein Yahyavi
Keyword(s):  
Polyethylene Glycol ◽  
Solid Phase Extraction ◽  
Silica Gel ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Extraction Procedure ◽  
Calibration Graph ◽  
Phase Extraction ◽  
Relative Standard

A new solid phase extraction procedure was developed for preconcentration of iron(II) using silica gel-polyethylene glycol (silica-PEG) as an adsorbent. The method is based on retention of iron(II) as 2,2′ bipyridine complex on silica-PEG. The retained complex is eluted by 1.0 mol L−1of sulfuric acid-acetone mixture (1:2) and its absorbance is measured at 518 nm, spectrophotometrically. The effects of different parameters such as pH, concentration of the reagent, eluting reagent, sample volume, amount of adsorbent, and interfering ions were investigated. The calibration graph was linear in the range of 1–60 ng mL−1of iron(II). The limit of detection based on3Sbwas 0.57 ng mL−1and relative standard deviations (R.S.D) for ten replicate measurements of 12 and 42 ng mL−1of iron(II) were 2.4 and 1.7%, respectively. The method was applied to the determination of of iron(II) in water, multivitamin tablet, and spinach samples.

Pipette-tip solid-phase extraction based on deep eutectic solvent modified graphene for the determination of sulfamerazine in river water

2017 ◽  
Vol 40 (9) ◽  
pp. 1887-1895 ◽  
Author(s):  
Lingling Liu ◽  
Weiyang Tang ◽  
Baokun Tang ◽  
Dandan Han ◽  
Kyung Ho Row ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
River Water ◽  
Solid Phase ◽  
Deep Eutectic Solvent ◽  
Phase Extraction ◽  
Pipette Tip ◽  
Modified Graphene

scholarly journals Determination of Phthalate Plasticisers in Palm Oil Using Online Solid Phase Extraction-Liquid Chromatography (SPE-LC)

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Nazarudin Ibrahim ◽  
Rozita Osman ◽  
Azmui Abdullah ◽  
Norashikin Saim
Keyword(s):  
Solid Phase Extraction ◽  
Palm Oil ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Correlation Coefficients ◽  
Array Detector ◽  
Phase Extraction ◽  
Extraction Solvent ◽  
Online Solid Phase Extraction

Contamination of phthalates plasticisers to food has raised concern as some of the phthalates are suspected to be endocrine disruptors. The phthalates have high affinity with oily environment and analysing these chemicals in such matrices is difficult because of the trace amount of the analyte and interference from matrix. An online solid phase extraction (SPE) technique using a large volume (3.5 mL) injection was developed for the analysis of 6 common plasticisers in palm oil. A simple sample preparation involving alumina as a fat retainer and methanol : acetonitrile (1 : 1) as the extraction solvent was performed prior to the usage of online SPE-LC system. This system consists of two columns, C16for the solid phase extraction (SPE) and C18as the analytical column, and a photo diode array detector. The calibration curves were linear from 5 to 1000 μg L−1, with correlation coefficients above 0.99. The instrumental limit of detection was 3 μg L−1and satisfactory recovery was obtained. A screening on a few samples in the retail market revealed the presence of dibutyl phthalate (DBP) and butylbenzylphthalate (BBP) in the palm oil, with concentration less than 1 mg L−1.

scholarly journals HPLC method validation and application for organic acid analysis in wine after solid-phase extraction

2016 ◽  
Vol 35 (2) ◽  
pp. 225 ◽  
Author(s):  
Violeta Ivanova-Petropulos ◽  
Krste Tašev ◽  
Marina Stefova
Keyword(s):  
Solid Phase Extraction ◽  
Organic Acids ◽  
High Performance ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Hplc Method ◽  
Phase Extraction ◽  
Hplc Separation ◽  
Limit Of Quantification

<p>A solid-phase extraction method followed by reverse phase high-performance liquid chromatography (RP-HPLC) was optimized and validated for the quantitative determination of tartaric, malic, shikimic, lactic, citric and succinic acids in wine. Solid-phase extraction was carried out with C18 cartridges and extraction recoveries for all acids ranging from 98.3 to 103% were obtained. HPLC separation was performed with isocratic elution on a LiChrosorb RP-18 column (250 × 4.6 mm I.D., 5 µm) protected with the appropriate guard column. The mobile phase was a 5 mM solution of H<sub>3</sub>PO<sub>4</sub> with pH 2.1 at a flow rate of 1 ml/min. Detection of the organic acids was performed at 210 nm. The developed method was validated by checking its linearity, limit of detection (LOD), limit of quantification (LOQ), precision and recovery. The method was applied to the analysis of organic acids in Macedonian red and white wines.</p>

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