Dispersive liquid–liquid microextraction for the determination of vitamins D and K in foods by liquid chromatography with diode-array and atmospheric pressure chemical ionization-mass spectrometry detection

Synthesis and characterization of α-nickel (II) hydroxide particles on organic-inorganic matrix and its application in a sensitive electrochemical sensor for vitamin D determination

“…Low solubility in water makes it easier to be determined by non-electrochemical analytical techniques [17]. Taking into account the synergism between amorphous Ni(OH) 2 , graphene oxide and silica, such materials can be applied together in the development of electrochemical sensors for direct vitamin D quantification in biological matrices.…”

Highly Sensitive Electrochemical Sensor for Determination of Vitamin D in Mixtures of Water‐Ethanol

“…They are most commonly determined using other analytical techniques, such as chromatographic or fluorescent ones [8][9][10], with their already known limitations towards miniaturization, point-of-care application, low cost and long analytical periods, etc. Therefore, the development of electrochemical sensors that are capable of determining vitamin D becomes a very important research objective due to the possibility of overcoming the above-mentioned limitations of traditional analytical techniques.…”

Rapid and Highly Sensitive Determination of Melamine in Different Food Samples by Corona Discharge Ion Mobility Spectrometry after Dispersive Liquid-Liquid Microextraction

“…However, the extraction efficiencies decreased with further increases in salt concentration. Many researchers investigating the "salting-out" effect have also reported similar results, 26,27 i.e., that the solubility of the analytes in the sample solution decreased due to an increase in ionic strength, thus promoting the extraction efficiency. On the other hand, there is a possibility that these polar target analyte molecules participated in electrostatic interactions with the salt ions in the solution and thus caused the polar molecules to precipitate.…”

“…DLLME can be combined with techniques such as ultraviolet-visible light (UV-Vis) spectrophotometry, gas chromatography and high performance liquid chromatography. [27][28][29][30] Recently, ion mobility spectrometry (IMS) has become a serious alternative to the traditional methods used for detection purposes. IMS is an analytical technique based on the gas-phase separation of ionized compounds under an electric field at ambient pressure by their mobility in the drift gas.…”