Novel mixed hemimicelles based on nonionic surfactant-imidazolium ionic liquid and magnetic halloysite nanotubes as efficient approach for analytical determination.

The co-adsorption of mixed nonionic surfactant and imidazolium-based ionic liquid, Triton X100 (TX100), with 1-cetyl-3-methylimidazolium bromide (CmimBr) adsorbed onto the surface of magnetic halloysite nanotubes (MHNTs) was used as an efficient adsorbent for simultaneous determination of amlodipine and nimodipine in urine. The designed adsorbent was characterized by TEM, TGA, FTIR, and DLS analysis methods. All the parameters that influence the extraction efficiency are optimized with the aid of response surface methodology (RSM).

Colorimetric chiral recognition of D/L-phenylalanine based on triangular silver nanoplates.

A new colorimetric analysis approach for chiral recognition of D- and L-forms of phenylalanine (phe) was developed based on triangular silver nanoplates (TAg-NPs). The TAg-NPs could be used as chiral colorimetric probes for D- and L-forms of phe. Upon addition of D-phe to TAg-NPs solution, a color change from blue to purple to pink could be observed, while no obvious color change was found on addition of L-phe.

Colorimetric sensor for cimetidine detection in human urine based on d-xylose protected gold nanoparticles.

Herein, a simple, novel, and rapid colorimetric sensor for cimetidine (Cim) detection based on d-xylose protected gold nanoparticles (d-x@AuNPs) has been developed for the first time. The d-x@AuNPs were characterized by UV-vis, TEM and FT-IR techniques. Cimetidine causes the aggregation of d-x@AuNPs due to the formation of a strong covalent Au-N bond and electrostatic binding.

Label-Free Silver Nanoparticles for the Determination of Gentamicin.

A new spectrophotometric method for the determination of gentamicin has been developed. The method is based on the aggregation of label-free silver nanoparticles leading to change in absorption spectra and color of the solution. Influence of different factors on the aggregation and analytical performance of the method were investigated.

Colorimetric recognition of pazufloxacin mesilate based on the aggregation of gold nanoparticles.

A novel colorimetric nanomaterial-assisted optical sensor for pazufloxacin mesilate was proposed for the first time. Pazufloxacin mesilate could induce the aggregation of glucose-reduced gold nanoparticles (AuNPs) through hydrogen-bonding interaction and electrostatic attraction, leading to the changes in color and absorption spectra of AuNPs. The effect of different factors such as pH, the amount of AuNPs, reaction time and reaction temperature was inspected.