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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
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
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)
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
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
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
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)
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
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)
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
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
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.
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
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)
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
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
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
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)
Kin-Cheung Chan et al.
Dalton transactions (Cambridge, England : 2003), 44(34), 15135-15144 (2015-05-06)
A new series of cyclometalated iridium(III) complexes with isocyanoborate ligands [Ir(R2ppy)2(L)(CNBR'3)] (R = H or F; L = CNC6H4Cl-4 or PPh3; R' = Ph, C6F5 or C6H4Cl-4), [Ir(biqb)(ppy)(CNBR''3)] (R'' = C6F5 or C6H4Cl-4) and {Ir(ppy)2(CN)n[CNB(C6F5)3]2-n}(-) (n = 0 or 1)
M M Khater et al.
Bioelectrochemistry (Amsterdam, Netherlands), 77(1), 53-59 (2009-08-18)
In this study a PVC membrane electrode for determination of ketotifen fumarate is reported, where ketotifen tetraphenylborate (Keto-TPB) was used as ion exchanger. The electrode has linear range of 5.6x10(-6)-1.0x10(-2) and 1.0x10(-5)-1.0x10(-2) mol/L, with detection limits 2.37x10(-6)and 4.60x10(-6) mol/L in
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)
Yuriy Zholudov et al.
The Analyst, 136(3), 598-604 (2010-11-26)
The study of electrogenerated chemiluminescence (ECL) in aqueous and non-aqueous media with tetraphenylborate anion as a co-reactant is reported. The obtained results indicate that tetraphenylborate acts according to an oxidative reduction scheme and forms a strong reducer after being homogeneously
K.C. Narasimham et al.
Analyst, 97, 260-260 (1972)
Gamal Abdel Hafiz Mostafa et al.
Journal of AOAC International, 93(2), 549-555 (2010-05-20)
The construction and electrochemical response characteristics of polyvinylchloride (PVC) membrane sensors for donepezil HCl (DP) are described. The sensing membranes incorporated ion-association complexes of DP cation and sodium tetraphenyl borate (sensor 1), phosphomolybdic acid (sensor 2), or phosphotungstic acid (sensor
Assadollah Beiraghi et al.
Journal of hazardous materials, 190(1-3), 962-968 (2011-05-04)
A new optical sensor was fabricated for determination of beryllium ions. The optode membrane was prepared by incorporation of 1,8-dihydroxyanthrone and sodium tetraphenylborate (NaTPB) in a plasticized poly (vinyl chloride) membrane containing ortho-nitrophenyl octyl ether (o-NPOE) as a plasticizer. Color
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.
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
Stephen Wai-cheung Chung et al.
Journal of chromatography. A, 1218(9), 1260-1265 (2011-01-25)
A reliable and sensitive method for determination simultaneously of monomethylmercury (MeHg) and monoethylmercury (EtHg) in various types of foods by gas chromatography inductively coupled plasma mass spectrometry (GC-ICP/MS) was developed and validated. Samples were digested with pancreatin and then hydrochloric
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
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