Aqueous two-phase extraction and spectrofluorimetric determination of nitrite with o-phenylenediamine enhanced by hydroxypropyl-β-cyclodextrin in urine samples

2014 ◽  
Vol 6 (2) ◽  
pp. 463-468 ◽  
Author(s):  
Chang Liu ◽  
Xiaoyan Qiu ◽  
Jiao zhao ◽  
Yaling Yang
Keyword(s):  
Urine Samples ◽  
Phase Extraction ◽  
Two Phase ◽  
Spectrofluorimetric Determination ◽  
Aqueous Two Phase Extraction

scholarly journals A Novel and Sensitive Method for the Determination of VitaminB2(Riboflavin) in Urine and Pharmaceutical Samples Using an Aqueous Two-Phase Extraction

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Sabah Shiri ◽  
Tahere Khezeli ◽  
Sami Sajjadifar ◽  
Ali Delpisheh ◽  
Moayed Avazpour ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Standard Deviation ◽  
Limit Of Detection ◽  
Vitamin B ◽  
Phase Extraction ◽  
Two Phase ◽  
Pharmaceutical Samples ◽  
Relative Standard ◽  
Aqueous Two Phase Extraction

A novel, simple, and more sensitive spectrophotometric procedure has been developed for the determination of vitamin B2(riboflavin) by an aqueous two-phase extraction (ATPE). An ATPE is formed mostly by water and does not require an organic solvent. Other ATPE components used in this study were the polymer, polyethylene glycol (PEG), and some salts such as Na2SO4and Na2CO3. The method is based on the interaction between vitamin B2(riboflavin) and sodium sulfate (Na2SO4) in an acidic medium (pH 6.4). The influences of effective parameters such as salt (type and concentration), polyethylene glycol (molecular weight and concentration), temperature, centrifuging time, and pH of the sample solution were studied and optimized. The linear range was 1.3–320 ng/mL (R2=0.9991;n=10) with the relative standard deviation (RSD) for 60 ng/mL 3.68%. The limit of detection (LOD) calculated from three times of standard deviation of blank were 0.2 ng/mL and recoveries from analysis of real samples between 94.82% and 103.98% were obtained for the determination of vitamin B2(riboflavin) in urine and pharmaceutical samples.

Determination of common ginsenosides in Kang'ai injection by aqueous two-phase extraction with deep eutectic solvents and HPLC-UV/DAD

2018 ◽  
Vol 137 ◽  
pp. 302-308 ◽  
Author(s):  
Peng Li ◽  
Pengyun Zhao ◽  
Weijie Liu ◽  
Yifu Jiang ◽  
Wenjiao Wang ◽  
...  
Keyword(s):  
Deep Eutectic Solvents ◽  
Phase Extraction ◽  
Two Phase ◽  
Aqueous Two Phase Extraction

Determination of steroid hormones in milk using aqueous two-phase extraction coupled to liquid chromatography

2015 ◽  
Vol 7 (6) ◽  
pp. 2514-2522 ◽  
Author(s):  
Na Li ◽  
Xiao Yang ◽  
Li Nian ◽  
Zhibing Wang ◽  
Lei Lei ◽  
...  
Keyword(s):  
Liquid Chromatography ◽  
Steroid Hormones ◽  
Phase System ◽  
Phase Extraction ◽  
Two Phase ◽  
Aqueous Two Phase System ◽  
Aqueous Two Phase Extraction

An acetonitrile (ACN)-salt based aqueous two-phase system was developed and applied to the extraction of steroid hormones in milk.

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