In our study, a simple and sensitive method was proposed for determination of vitamins B group in leaves of Suaeda aegyptiaca and Suaeda Vera (Halophytes) by HPLC-DAD with solid-phase extraction (SPE) as the preconcentration step. The variables affecting the extraction and determination conditions were investigated and optimized. A preconcentration step based on SPE is necessary to remove interfering components. The limit of detection obtained was <5 mg kg(-1), the relative standard deviation (RSD) was <4%, and the recovery was in the range of 91-102%. The linear correlation coefficient was 0.999. The method was successfully applied to determine group B vitamins in the halophyte samples. As a whole, these findings may confirm the interesting potential of this halophyte as a valuable source of natural bioactive molecules.
In the current work, a rapid and simple dispersive liquid-liquid microextraction method (DLLME) was used to determine Bisphenol A (BPA). High performance liquid chromatography with the photodiode-array detector (HPLC-DAD) coupled DLLME method was employed to analyze BPA in food samples packaged including cans, paper boxes, and glass jars. The calibration curve was obtained to be in the linear range 0.009–25 ngg
−1
with a correlation coefficient of R2 = 0.9981. The mean relative standard deviations (RSDs) was of 5.2% (
n
= 3). The limit of detection (LOD) and the limit of quantification (LOQ) of the method were obtained to be 0.001 ngg
−1
and 0.08 ng.g
−1
, respectively.
In sum, this method presents:
A rapid, simple and efficient modified DLLME method was used to measure BPA in packaged foods.
The advantages of this method were low detection limit, fast preparation, and high BPA recovery.
The DLLME-HPLC method consists of low detection limit and high recoveries to determine BPA in samples.
The results indicated that DLLME –HPLC-DAD was an applied method to measure BPA in food samples.
A new, rapid and highly sensitive and rapid method was proposed for the simultaneous determination trace levels of vitamin C and folic acid in the human urine samples. The inûuence affecting factors on the UA-DLLME such as type and volume of the dispersive and extraction solvent, pH, ionic strength and temperature of sample solution, sonication condition investigated and optimized. Under the optimized extractions, relative standard deviations (RSD) of the analyses less than 6% (n= 3) and detection limit of 1.65-2.05 ng mL -1 respectively. USAEME -HPLC-UV was successfully applied for the simultaneous determination of trace levels of vitamin C and folic acid in human urine Samples.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.