72020

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Recorded amperometric tetraphenylborate titrations of amines, quaternary nitrogen compounds, and potassium salts.

J E Sinsheimer et al.

Journal of pharmaceutical sciences, 54(5), 805-806 (1965-05-01)

Determination of the leaching of polymeric ion-selective membrane components by stripping voltammetry.

Beata Paczosa-Bator et al.

Talanta, 81(3), 1003-1009 (2010-03-20)

This paper focuses on the quantitative determination of the loss of the components from plastic membranes of ion-selective electrodes (ISEs) during contact with aqueous bathing solutions. The leaching processes, which affect the ISE responses, are rarely characterized by independent methods.

Molecular structure and magnetic properties of 1-ethyl-2-(1-oxy-3-oxo-4,4,5,5-tetramethylimidazolin-2-yl)-3-methylimidazolium arylcarboxylates and other salts.

Hiroyuki Hayashi et al.

The Journal of organic chemistry, 73(22), 8683-8693 (2008-10-16)

1-Ethyl-2-(1-oxy-3-oxo-4,4,5,5-tetramethylimidazolin-2-yl)-3-methylimidazolium bromide, [EMINN](+)[Br](-), carrying nitronylnitroxide (NN) in the cation unit, was prepared as a parent molecule and converted to seven salts, [EMINN](+)[X](-) (X = I, TFSI (bis(trifluoromethanesulfonyl)imide), BPh4 (tetraphenylborate), [EMINN](+)(1-3)[BA(1-3)]((1-3)-); BA1 (benzoic acid), BA2 (terephthalic acid), and BA3 (trimesic acid)

Sibutramine selective electrodes for batch and flow injection determinations in pharmaceutical preparations.

S I M Zayed et al.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry, 26(1), 45-49 (2010-01-13)

The construction and electrochemical response characteristics of two new polyvinyl chloride (PVC) membrane sensors for the determination of sibutramine hydrochloride were described. The sensors are based on the ion association complexes of sibutramine with sodium tetraphenylborate (NaTPB) or phosphotungstic acid

Simultaneous potentiometric determination of cationic and ethoxylated nonionic surfactants in liquid cleaners and disinfectants.

Mirela Samardžić et al.

Talanta, 83(3), 789-794 (2010-12-15)

A sensitive potentiometric surfactant sensor based on a highly lipophilic 1,3-didecyl-2-methyl-imidazolium cation and a tetraphenylborate (TPB) antagonist ion was used as the end-point detector in ion-pair potentiometric surfactant titrations using sodium TPB as a titrant. Several analytical and technical grade

Anions make the difference: insights from the interaction of big cations and anions with poly(N-isopropylacrylamide) chains and microgels.

Leonor Pérez-Fuentes et al.

Soft matter, 11(25), 5077-5086 (2015-06-02)

Minute concentrations of big hydrophobic ions have the ability to induce substantial effects in soft matter systems, including novel phases in lipid layers, giant charge inversion in colloids and nanostructuration in polymer surfaces in contact with water. The effects are

Effects of EDTA on routine and specialized coagulation testing and an easy method to distinguish EDTA-treated from citrated plasma samples.

Ronda A Crist et al.

Laboratory hematology : official publication of the International Society for Laboratory Hematology, 15(4), 45-48 (2009-11-20)

Coagulation testing is performed with citrate-treated plasma. Samples submitted in other anticoagulants, such as EDTA, should not be tested. We aimed to evaluate the effects of EDTA on routine and specialized coagulation tests and to establish sodium tetraphenylborate testing as

Rhodium-catalyzed phenylation of N-arylsulfonyl aldimines with sodium tetraphenylborate or trimethyl (phenyl) stannane.

Ueda M and Miyaura N.

Journal of Organometallic Chemistry, 595(1), 31-35 (2000)

Use of a new ziprasidone-selective electrode in mixed solvents and its application in the analysis of pharmaceuticals and biological fluids.

M Soledad García et al.

Sensors (Basel, Switzerland), 11(9), 8813-8825 (2011-12-14)

The construction and characterization of a new ion-selective electrode for the determination of the antipsychotic ziprasidone in mixed solvents is presented. The electrode contains a plasticized polymeric membrane based on a ziprasidone-tetraphenylborate ion-exchanger. The influence of membrane composition on the

Effect of Chaenomeles sinensis Extract on Choline Acetyltransferase Activity and Trimethyltin-Induced Learning and Memory Impairment in Mice.

Yoon Kyung Kwon et al.

Chemical & pharmaceutical bulletin, 63(12), 1076-1080 (2015-12-04)

The aim of this study was to search for a novel choline acetyltransferase (ChAT) activator from plants traditionally grown in Korea. An ethanol extract from Chaenomeles sinensis Koehne showed the highest ChAT-activating effect in vitro in an assay that used

An efficient and selective flourescent chemical sensor based on 5-(8-hydroxy-2-quinolinylmethyl)-2,8-dithia-5-aza-2,6-pyridinophane as a new fluoroionophore for determination of iron(III) ions. A novel probe for iron speciation.

Mojtaba Shamsipur et al.

Analytica chimica acta, 761, 169-177 (2013-01-15)

A novel fluorescent chemical sensor for the highly sensitive and selective determination of Fe(3+) ions in aqueous solutions is prepared. The iron sensing system was prepared by incorporating 5-(8-hydroxy-2-quinolinylmethyl)-2,8-dithia-5-aza-2,6-pyridinophane (L) as a neutral Fe(3+)-selective fluoroionophore in the plasticized PVC membrane

Ligandless palladium catalyzed reactions of arylboronic acids and sodium tetraphenylborate with aryl halides in aqueous media.

Bumagin NA and Bykov VV.

Tetrahedron, 53(42), 14437-14450 (1997)

Comparison of tetraethylborate and tetraphenylborate for selenite determination in human urine by gas chromatography mass spectrometry, after headspace solid phase microextraction.

D C Kapsimali et al.

Talanta, 80(3), 1311-1317 (2009-12-17)

Two different derivatizing reagents were tested for the development of a fast and sensitive method for the determination of selenites (Se(IV)) in human urine. The reagents were sodium tetraethylborate (NaBEt(4)) and tetraphenylborate (NaBPh(4)), respectively, and the procedure is based on

Novel screen-printed electrode for the determination of dodecyltrimethylammonium bromide in water samples.

Gehad G Mohamed et al.

Drug testing and analysis, 4(12), 1009-1013 (2011-10-15)

The construction and electrochemical response characteristics of a screen-printed electrode (SPE) for the determination of dodecyltrimethylammonium bromide (DTAB) are described. The sensor was based on the use of DTA-tetraphenylborate ion association complex as an electroactive material in screen-printed electrode with

Determination of potassium by an automatic ultraviolet absorptiometric method.

J M Skinner et al.

Talanta, 14(12), 1393-1401 (1967-12-01)

An automatic ultraviolet absorptiometric method has been developed for the determination of potassium. The method involves precipitation of potassium by addition of a known excess of sodium tetraphenylborate, removal of the potassium tetraphenylborate precipitate by filtration, and measurement of the

A novel and sensitive resonance scattering assay for detection of urea in serum coupled urease catalytic reaction and NH4+ associated particle reaction.

Aihui Liang et al.

Bioprocess and biosystems engineering, 34(5), 639-645 (2011-01-22)

In the pH 6.6 Na2HPO4-NaH2PO4 buffer solutions and in the presence of urease catalyst, urea can be decomposed to form NH4+. The NH4+ reacted with sodium tetraphenyl boron (NaTPB) to form the association particles that exhibited a resonance scattering (RS)

Separation and purification of ε-poly-L-lysine from the culture broth based on precipitation with the tetraphenylborate anion.

Hajime Katano et al.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry, 28(12), 1153-1157 (2012-12-13)

A biopolymer ε-poly-L-lysine (εPL) exists as a fully protonated form (εPLH(n+)) in solutions at pH < 4. Around pH 3.5, at which the tetraphenylborate (TPB(-)) anion is not decomposed immediately, the εPLH(n+) cation associates with the TPB(-) anion to form

Gas chromatographic determination of organomercury following aqueous derivatization with sodium tetraethylborate and sodium tetraphenylborate. Comparative study of gas chromatography coupled with atomic fluorescence spectrometry, atomic emission spectrometry and mass spectrometry.

Y Cai et al.

Journal of chromatography. A, 876(1-2), 147-155 (2000-05-24)

Several hyphenated analytical techniques, including gas chromatography (GC) coupled with atomic fluorescence spectrometry (AFS), microwave-induced plasma atomic emission spectrometry (AES), and mass spectrometry (MS), have been evaluated for methylmercury and ethylmercury analysis following aqueous derivatization with both sodium tetraethylborate and

Hippocampal Lewy pathology and cholinergic dysfunction are associated with dementia in Parkinson's disease.

Hélène Hall et al.

Brain : a journal of neurology, 137(Pt 9), 2493-2508 (2014-07-27)

The neuropathological substrate of dementia in patients with Parkinson's disease is still under debate, particularly in patients with insufficient alternate neuropathology for other degenerative dementias. In patients with pure Lewy body Parkinson's disease, previous post-mortem studies have shown that dopaminergic

A multinuclear solid-state NMR study of alkali metal ions in tetraphenylborate salts, M[BPh4] (M = Na, K, Rb and Cs): what is the NMR signature of cation-pi interactions?

Gang Wu et al.

The journal of physical chemistry. A, 112(41), 10359-10364 (2008-09-26)

We report a multinuclear solid-state ( (23)Na, (39)K, (87)Rb, (133)Cs) NMR study of tetraphenylborate salts, M[BPh 4] (M = Na, K, Rb, Cs). These compounds are isostructural in the solid state with the alkali metal ion surrounded by four phenyl

Bismuth coordination chemistry with allyl, alkoxide, aryloxide, and tetraphenylborate ligands and the {[2,6-(Me2NCH2)2C6H3]2Bi}+ cation.

Ian J Casely et al.

Inorganic chemistry, 50(4), 1513-1520 (2011-01-05)

A series of bis(aryl) bismuth compounds containing (N,C,N)-pincer ligands, [2,6-(Me(2)NCH(2))(2)C(6)H(3)](-) (Ar'), have been synthesized and structurally characterized to compare the coordination chemistry of Bi(3+) with similarly sized lanthanide ions, Ln(3+). Treatment of Ar'(2)BiCl, 1, with ClMg(CH(2)CH═CH(2)) affords the allyl complex

K. Vytras

Collection of Czechoslovak Chemical Communications, 42, 3168-3168 (1977)

Comparison of two derivatization reagents for the simultaneous determination of organolead and organomanganese compounds using solid-phase microextraction followed by gas chromatography with atomic emission detection.

Rosa Peñalver et al.

Talanta, 87, 268-275 (2011-11-22)

Two procedures for the simultaneous determination of organolead (tetraethyllead, triethyllead and trimethyllead) and organomanganese compounds (cyclopentadienyl manganese tricarbonyl (CMT) and methylcyclopentadienyl manganese tricarbonyl (MMT)) are studied. Both procedures involve sample preconcentration by solid-phase microextraction and capillary gas chromatography coupled to

Hydrophobic anions potently and uncompetitively antagonize GABA(A) receptor function in the absence of a conventional binding site.

M Chisari et al.

British journal of pharmacology, 164(2b), 667-680 (2011-04-05)

A 'lock-and-key' binding site typically accounts for the effect of receptor antagonists. However, sulphated neurosteroids are potent non-competitive antagonists of GABA(A) receptors without a clear structure-activity relationship. To gain new insights, we tested two structurally unrelated hydrophobic anions with superficially

Halogen-free ionic liquid as an additive in zinc(II)-selective electrode: surface analyses as correlated to the membrane activity.

Maryam F Al-Asousi et al.

Talanta, 94, 184-188 (2012-05-23)

Two conventional Zn(II) polyvinyl chloride (PVC) membrane electrodes have been prepared and characterized. They were based on dibenzo-24-crown-8 (DBC) as a neutral carrier, dioctyl phthalate (DOP) as a plasticizer, and potassium tetrakis (p-chlorophenyl) borate, KTpClPB or the halogen-free ionic liquid

Septonex-tetraphenylborate screen-printed ion selective electrode for the potentiometric determination of Septonex in pharmaceutical preparations.

Gehad G Mohamed et al.

The Analyst, 136(7), 1488-1495 (2011-02-03)

A screen-printed electrode (SPE) was fabricated for the determination of 1-(ethoxycarbonyl)pentadecyltrimethylammonium bromide (Septonex) based on the use of Septonex-tetraphenylborate as the electroactive substance, and o-nitrophenyloctylether (o-NPOE) as the plasticizing agent. The electrode passes a near-Nernstian cationic slope of 59.33 ±

E.D. Schall

Analytical Chemistry, 29, 1044-1044 (1957)

K.C. Narasimham et al.

Analyst, 97, 260-260 (1972)

Potentiometric polymeric membrane electrodes for mercury detection using calixarene ionophores.

Sonika Tyagi et al.

Water science and technology : a journal of the International Association on Water Pollution Research, 61(3), 693-704 (2010-02-13)

It is here established that potentiometric polymeric membrane electrodes based on electrically neutral ionophores are a useful analytical tool for the detection of heavy metal ions from environmental and industrial waste water. PVC based membrane containing p-tert-butyl-calix[4]arenethioether derivative as active

Rhodium-catalyzed [2 + 2] cycloaddition of ynamides with nitroalkenes.

Donna L Smith et al.

Organic letters, 14(18), 4934-4937 (2012-09-08)

In the presence of a diene-ligated rhodium complex, ynamides and nitroalkenes undergo catalytic [2 + 2] cycloadditions to provide cyclobutenamides. The presence of sodium tetraphenylborate was found to be crucial for the reactions to proceed efficiently.

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