Fabrication of magnetic microsphere-confined graphene for the preconcentration of some phthalate esters from environmental water and soybean milk samples followed by their determination by HPLC

Talanta ◽  
2013 ◽  
Vol 109 ◽  
pp. 133-140 ◽  
Author(s):  
Weina Wang ◽  
Ruiyang Ma ◽  
Qiuhua Wu ◽  
Chun Wang ◽  
Zhi Wang
Keyword(s):  
Phthalate Esters ◽  
Environmental Water ◽  
Magnetic Microsphere ◽  
Soybean Milk ◽  
Milk Samples

Preparation of magnetic zeolitic imidazolate framework-67 composites for the extraction of phthalate esters from environmental water samples

2020 ◽  
Vol 12 (40) ◽  
pp. 4906-4912
Author(s):  
Qingsong Zhang ◽  
Guangyang Liu ◽  
Xiaolin Cao ◽  
Jungang Yin ◽  
Ziping Zhang
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Phthalate Esters ◽  
Magnetic Solid Phase Extraction ◽  
Environmental Water ◽  
Phase Extraction ◽  
Zeolitic Imidazolate Framework ◽  
Magnetic Solid

In this paper, magnetic ZIF-67 composites were prepared by an in situ method and utilized in the magnetic solid-phase extraction of phthalate esters.

scholarly journals Zinc fractionation in cow, goat, sheep and soybean milk samples using gel-electrophoresis and determination by electrothermal atomic absorption spectrometry (ETAAS)

2021 ◽  
Vol 46 (1) ◽  
pp. 12-20
Author(s):  
Carla Maíra Bossu ◽  
Rodrigo Giglioti ◽  
Marcia Cristina de Sena Oliveira ◽  
Pedro Vitoriano De Oliveira ◽  
Ana Rita de Araujo Nogueira
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Gel Electrophoresis ◽  
Screening Method ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Microwave Oven ◽  
Soybean Milk ◽  
Milk Samples ◽  
Casein Protein

A screening method for zinc levels in different milk samples (raw cow, raw sheep, UHT cow, UHT goat and soybean milk base) was performed to establish the Zn levels’ differences in protein samples. The samples were digested in a cavity microwave oven and the total Zn levels in the extracts were determined by flame absorption atomic spectrometry (FAAS). The protein separation was performed by urea polyacrylamide gel electrophoresis (UREA-PAGE). Protein bands were digested in the cavity microwave oven and Zn-protein analysis was further conducted by electrothermal atomic absorption spectrometry (ETAAS). The results showed that Zn is mainly bound to 32 kDa (β-casein) protein (17.0 ± 2.0%) in UHT cow and 24 kDa (α-casein) protein (9.0 ± 0.6%) in raw sheep milk. This method provided quantitative information regarding Zn species present in the protein fractions of the milk samples. The accuracy was evaluated using certified reference material (whole milk powder, NIST 8435) with statistically equivalent concentrations (Student’s t-test) for total Zn and by addition and recovery experiments applied to measure Zn-protein. The recovered values were in the 92-110% range.

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