The conformation of the 1: 1 complex of protoporphyrin IX and apomyoglobin was studied by circular dichroism, potentiometric titration, and reaction with bromoacetate. Circular dichroism studies indicate that protoporphyrin and heme similarly affect the o-helix content of apomyoglobin. The apparent number of normal imidazoles in the protoporphyrin-apomyoglobin complex, as judged by reactivity t...

The introduction of low detection limit ion selective electrodes (ISEs) may well pave the way for the determination of trace targets of cationic compounds. This research focuses on the detection of titanium (III) cation using a new PVC-membrane sensor based on synthesized tris(2pyridyl) methylamine (tpm) ionophore. The application and validation of the proposed sensor was done using potentiomet...

An AISI 304 stainless steel laminar electrode without oxidative treatment was investigated for the potentiometric titration of hydrochloric acid with sodium hydroxide. The proposed obtained from metalworking cuttings. Scanning electron microscopy, energy dispersive X-ray spectroscopy, fluorescence spectroscopy and diffraction were used to study surface morphology chemical composition electrode....

The protonation constants of DTPA (diethylenetriaminepentaacetic acid) and two derivatives of DTPA, 1-R(4,4diphenyl cyclohexyl-phosphonyl-methyl diethylenentriaminepentaacetic acid (MS-325) and (R)-hydroxymethyl-diethylenentriaminepentaacetic acid (HMDTPA) were determined by potentiometric titration in 0.1 M NaClO4. The formation of 1 : 1 complexes of Am3+, Cm3+ and Ln3+ cations with these thre...

“S INTRODUCTION The concentration of sodium metabisulfite (Na2S2O5) in an ECP-2 bleach accelerator sample is determined by a manual or potentiometric titration using an iodine (I3) titrant. In the method an excess of iodine is added to the sample. Sodium metabisulfite and Kodak persulfate bleach accelerator, PBA-1, present in the sample react with a portion of the iodine. The iodine that did no...

Use of a novel rotating polycation-sensitive polymer membrane electrode yields sensors that can serve as simple potentiometric titration endpoint detectors for the determination of three FDA approved low-molecular-weight heparin (LMWH) anticoagulant drugs (Fragmin, Normiflo, and Lovenox). The rotating electrode configuration dramatically improves the reproducibility and increases the sensitivit...