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IDA IDA, Iminodiacetic acid [CAS: 142-73-4]
Item #: I001 -

Chemical Structure Introduction Organic compounds that coordinate metal ions into circular structures (chelate circles) are called chelating reagents. Most chelating reagents include oxygen, nitrogen, or sulfur atoms in their molecules. Chelate structures with five or six member rings form the most stable chelate circle. In chelating reactions of typical chelating reagents, such as ethylenediamine, acetylacetone, and oxine, several molecules are coordinated with one metal ion. Ethylenediamine...

Kalibor Kalibor, Tetraphenylborate, sodium salt [CAS: 143-66-8]
Item #: K003 -

Product Description Kalibor is utilized for gravimetric analyses of K+, Rb+, Cs+, NH4+, amine compounds, alkaloids, onium compounds, and other monovalent ions, such as Ag(I), Cu(I) and Tl(I). Chemical Structure ...

MES MES, 2-Morpholinoethanesulfonic acid, monohydrate [CAS: 145224-94-8]
Item #: GB12 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

Mg(II)-EDTA Mg(II)-EDTA, Ethylenediamine-N,N,N’,N’-tetraacetic acid, magnesium, disodium salt, tetrahydrate [CAS: 14402-88-1]
Item #: E013 -

Chemical Structure Introduction Organic compounds that coordinate metal ions into circular structures (chelate circles) are called chelating reagents. Most chelating reagents include oxygen, nitrogen, or sulfur atoms in their molecules. Chelate structures with five or six member rings form the most stable chelate circle. In chelating reactions of typical chelating reagents, such as ethylenediamine, acetylacetone, and oxine, several molecules are coordinated with one metal ion. Ethylenediamine...

MOPS MOPS, 3-Morpholinopropanesulfonic acid [CAS: 1132-61-2]
Item #: GB13 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

MOPSO MOPSO, 2-Hydroxy-3-morpholinopropanesulfonic acid [CAS: 68399-77-9]
Item #: GB14 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

Murexide Murexide, Purpuric acid, ammonium salt [CAS 3051-09-0]
Item #: M011 -

Product Description of Murexide and MX MX is a 1:250 mixture of Murexide and potassium sulfate. Murexide is a metal indicator for Ca, Co, Cu, Ni, Th, and rare earth metals; it is also a colorimetric reagent for calcium and rare earth metals. Murexide is slightly soluble in water, alcohol, and ether. Murexide is unstable in aqueous solution. Its proton dissociation constants are reported to be pKa1=0, pKa2=9.2 and pKa3=10.5. The solution is yellow in strong acidic conditions, reddish-purple in...

MX MX, Mixture of ammonium purpurate and potassium sulfate (1:250)
Item #: M012 -

Product Description MX is a mixture of Murexide and potassium sulfate. Murexide is a metal indicator for Ca, Co, Cu, Ni, Th, and rare earth metals; it is also a colorimetric reagent for calcium and rare earth metals. Murexide is slightly soluble in water, alcohol, and ether. Murexide is unstable in aqueous solution. Its proton dissociation constants are reported to bepKa1=0, pKa2=9.2 and pKa3=10.5. The solution is yellow in strong acidic conditions, reddish-purple in weak acidic conditions,...

NN NN, 2-Hydroxy-1-(2-hydroxy-4-sulfo-1-naphthylazo)-3-naphthoic acid [CAS: 3737-95-9]
Item #: N013 -

Product Description NN is a colorimetric and chelatometric reagent for calcium (pH 12, λmax=470 nm) and UO22+ (λmax=570 nm, ε=1.36x105). Although NN is soluble in water, the solution is unstable and decomposes in a few minutes, especially in the presence of oxidative ions. Its proton dissociation constants are reported to be pKa2=9.26 and pKa3=13.67 (μ=0.1, 24ºC). An NN solution of 0.1% w/v in 50% aqueous methanol is stable for one week if stored in a cool and dark place. Ascorbic acid is used...

NTA NTA, Nitrilotriacetic acid [CAS: 139-13-9]
Item #: N016 -

Chemical Structure Introduction Organic compounds that coordinate metal ions into circular structures (chelate circles) are called chelating reagents. Most chelating reagents include oxygen, nitrogen, or sulfur atoms in their molecules. Chelate structures with five or six member rings form the most stable chelate circle. In chelating reactions of typical chelating reagents, such as ethylenediamine, acetylacetone, and oxine, several molecules are coordinated with one metal ion. Ethylenediamine...

NTPO NTPO, Nitrilotris(methylenephosphonic acid), trisodium [CAS: 7611-50-9]
Item #: N030 -

Chemical Structure Introduction Organic compounds that coordinate metal ions into circular structures (chelate circles) are called chelating reagents. Most chelating reagents include oxygen, nitrogen, or sulfur atoms in their molecules. Chelate structures with five or six member rings form the most stable chelate circle. In chelating reactions of typical chelating reagents, such as ethylenediamine, acetylacetone, and oxine, several molecules are coordinated with one metal ion. Ethylenediamine...

o-Phenanthroline o-Phenanthroline, 1,10-Phenanthroline, monohydrate [CAS: 5144-89-8]
Item #: P007 -

Product Description o-Phenanthroline is a colorimetric reagent for iron detection. It is also used as a reagent for the solvent extraction of anions. This reagent is slightly soluble in water (3.3 g/l at room temperature) and benzene (14 g/l at room temperature), and fairly soluble in alcohol (540 g/l), acetone, and diluted mineral acids. Its proton dissociation constants are reported to be pKa1=0.70 and pKa2=4.98 (μ=0.1, 25ºC). o-Phenanthroline forms a red chelate with Fe(II)...

PAN PAN, 1-(2-Pyridylazo)-2-naphthol [CAS: 85-85-8]
Item #: P002 -

Product Description PAN is a metal indicator and colorimetric reagent for heavy metal and rare earth metal ions. This reagent is slightly soluble in acidic solutions and soluble in alkaline solutions. Its proton dissociation constants are reported to be pKa1=2.9 and pKa2=11.6 (μ=0.1, NaClO4, at room temperature). The aqueous solution is yellow at pH<12 and red at pH>12. The distribution constants, logKD, of chloroform/water and carbon tetrachloride/water are reported to be 5.4 and 4.0,...

PAR PAR, 4-(2-Pyridylazo)resorcinol [CAS: 1141-59-9]
Item #: P003 -

Product Description PAR is a metal indicator and colorimetric reagent for heavy metal ions. The solubility of this reagent in water (5 mg per 100 ml at 10ºC) is higher than that of PAN. PAR is slightly soluble in alcohol. The aqueous solution is red at pH 5.5 or less, orange at pH 6-12.5, and red at pH 13 or higher. Its proton dissociation constants are reported to be pKa1(NH+)=3.1, pKa2(p-OH)=5.6 and pKa3(o-OH)=11.9 (m=0.2). PAR forms complexes with various metal ions that can be extracted...

PC PC, 3,3’-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolphthalein [CAS: 2411-89-4]
Item #: P004 -

Product Description PC is a colorimetric reagent and metal indicator for alkaline earth metal ions. This reagent is slightly soluble in water and readily soluble in aqueous ammonia or organic solvents. The aqueous solution is colorless at pH 11, but turns a strong pink in the presence of alkaline earth metals. PC is widely utilized for the determination of serum calcium by an autoanalyzer. Chemical Structure Applications Chelate titration: Ca, Ba, Mg, Sr, CN-, SO42- Colorimetry: Ca, Ba,...

PIPES PIPES, Piperazine-1,4-bis(2-ethanesulfonic acid) [CAS: 5625-37-6]
Item #: GB15 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

PIPES sesquisodium PIPES sesquisodium, Piperazine-1,4-bis(2-ethanesulfonic acid), sesquisodium salt, monohydrate
Item #: GB25 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

POPOP POPOP, 1,4-Bis(5-phenyl-2-oxazolyl)benzene [CAS: 1806-34-4]
Item #: P009 -

Chemical Structure Introduction Organic compounds that coordinate metal ions into circular structures (chelate circles) are called chelating reagents. Most chelating reagents include oxygen, nitrogen, or sulfur atoms in their molecules. Chelate structures with five or six member rings form the most stable chelate circle. In chelating reactions of typical chelating reagents, such as ethylenediamine, acetylacetone, and oxine, several molecules are coordinated with one metal ion. Ethylenediamine...

POPSO POPSO, Piperazine-1,4-bis(2-hydroxy-3-propanesulfonic acid), dihydrate [CAS: 68189-43-5]
Item #: GB16 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

SATP SATP, Salicylideneamino-2-thiophenol [CAS: 3449-05-6]
Item #: S003 -

Product Description SATP is a colorimetric solvent extraction reagent for Cu, In, Ni, and Sn. It is insoluble in water, but soluble in organic solvents. SATP forms yellow or brown complexes with various metal ions. The Sn(II) complex can be extracted with benzene (maximum wavelength: 415 nm, molar absorptivity: 1.61x105), xylene and toluene. Chemical Structure ...

Sodium bicinchoninate Sodium bicinchoninate, 4,4’-Dicarboxy-2,2’-biquinoline, disodium salt [CAS: 979-88-4]
Item #: B037 -

Product Description Sodium bicinchoninate is a Cu(I)- specific colorimetric reagent that is more sensitive than neocuproine. Its absorption maximum is at 562 nm (molar absorptivity: 7,900). In alkaline solution, Cu(II) is reduced by proteins to Cu(I), and then forms a purple complex with Sodium bicinchoninate. The protein detection range of this assay is 1-2,000 mg per ml. Chemical Structure ...

TAPS TAPS, N-Tris(hydroxymethyl)methyl-3-aminopropanesulfonic acid [CAS: 29915-38-6]
Item #: GB17 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

TAPSO TAPSO, 2-Hydroxy-N-tris(hydroxymethyl)methyl-3-aminopropanesulfonic acid [CAS: 68399-81-5]
Item #: GB20 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

TD19C6 TD19C6, 2,6,13,16,23,26-Hexaoxaheptacyclo[25.4.4.47,12.417,22.01,17.07,12.017,22]tritetracontane
Item #: T402 -

Product Description TD19C6 is an ammonium ion selective ionophore. It is difficult to separate ammonium ion and potassium ion because they are close in ion size. The selectivity of TD19C6 for ammonium ion is about 10 times that of potassium ion, which is nearly the same selectivity of nonactin. ...

TES TES, N-Tris(hydroxymethyl)methyl-2-aminoethenesulfonic acid [CAS: 7365-44-8]
Item #: GB18 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

TFPB TFPB, Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate, sodium salt, dihydrate [CAS: 79060-88-1]
Item #: T037 -

Product Description Tetraphenylborate is unstable in acidic conditions because protons attack the ipso-carbon of the phenyl group and benzene is released. However, the electron density of the ipso-carbon of TFPB is low due to a trifluoromethyl group. Thus TFPB is stable in acidic conditions (such as 50 mM sulfuric acid solution). TFPB is used in Friedel-Craft alkylation or diazo coupling reactions as a phase transfer reagent. It is also used for ion selective electrodes. TFPB is known as...

Tiron Tiron, 1,2-Dihydroxy-3,5-benzenedisulfonic acid, disodium salt, monohydrate [CAS: 149-45-1]
Item #: T021 -

Product Description Tiron is used as a metal indictor of Fe, and as a colorimetric reagent of Fe, Al, Ti, and other metal ions. Tiron is readily soluble in water as a colorless solution. The pKa2 is reported to be 12.6 (μ=0.1, 20ºC). Tiron forms colored chelates with Fe, Ti, and other metal ions. The color of the Fe complex is blue at pH 1-4 (1:1, logK=20.4), purple at pH 5-7 (1:2, logK=15.1), and red at pH 7 or over (1:3, logK=10.8). Product Description Application Chelate titration: Fe...

TOPO TOPO, Tri-n-octylphosphine oxide [CAS: 78-50-2]
Item #: T024 -

Product Description TOPO dissolves in cyclohexane. TOPO forms adducts with metal chelates to enhance solvent extraction efficiency (Synergistic effect). It can be used for rare earth metals, actinoids, and other metal ions indicated below. Product Description Application Solvent extraction: Al, Au, Co, Cr, Fe, Hf, Re, Ti, UO22+, V, Zr, rare earth metals, actinoids ...

TPPS TPPS, 5,10,15,20-Tetraphenyl-21H, 23H-porphinetetrasulfonic acid, disulfuric acid, tetrahydrate [CAS: 35218-75-8]
Item #: T003 -

Product Description TPPS is a water-soluble porphyrin that is reddish-purple in aqueous solution at pH 6.5 (maximum wavelength: 413 nm, molar absorptivity: 5.1x105) and green at pH 4 (maximum wavelength: 434 nm, molar absorptivity: 5.0x105). Its proton dissociation constants are reported to be pKa1=4.86 and pKa2=4.96. TPPS selectively forms a complex with Cu2+ in acidic conditions, and with Cd, Cu, Fe, Pb, and Pd in alkaline conditions. ...

Tricine Tricine, N-[Tris(hydroxymethyl)methyl]glycine [CAS: 5704-04-1]
Item #: GB19 -

Chemical Structure Introduction In biological experiments, it is important to maintain the pH of the solutions used. Buffers, mixtures of appropriate weak acids, and their conjugate bases, are usually used. Most biological reactions occur at a neutral pH, from 6 to 8; the buffer needs to be effective in this range. Furthermore, the acids and bases used in the buffer should not produce chelates with metal ions, which are essential in biological systems. For these reasons, Dr. Good developed...

TTHA TTHA, Triethylenetetramine-N,N,N’,N”,N”’,N”’-hexaacetic acid [CAS: 869-52-3]
Item #: T031 -

Chemical Structure Introduction Organic compounds that coordinate metal ions into circular structures (chelate circles) are called chelating reagents. Most chelating reagents include oxygen, nitrogen, or sulfur atoms in their molecules. Chelate structures with five or six member rings form the most stable chelate circle. In chelating reactions of typical chelating reagents, such as ethylenediamine, acetylacetone, and oxine, several molecules are coordinated with one metal ion. Ethylenediamine...

WSC WSC, 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide, hydrochloride [CAS: 25952-53-8]
Item #: W001 -

Chemical Structure Product Description of Calixarenes WSC is a water soluble carbodiimide. It is also soluble in alcohol, acetone, chloroform, dioxane, and DMF. WSC is used as a condensing agent for peptide syntheses. WSC and its urea form can be easily removed after the reaction due to their high water solubility. WSC, EDC, EDAC, EDCI, and ethyl-CDI are the same reagent. ...

XO XO, 3,3-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-cresolsulfonphthalein, disodium salt [CAS: 1611-35-4]
Item #: X003 -

Product Description XO is a colorimetric reagent and metal indicator of various metal ions. It is readily soluble in water. Its proton dissociation constants are reported to be -1.74, -1.09, 0.76, 1.15, 2.58, 3.23, 6.40, 10.5, and 12.6 (ion strength: 0.2). The color of the aqueous XO solution is yellow at pH < 6.3 and pink at pH > 6.5, and turns reddish-violet in the presence of metal ions. XO forms complexes with various metal ions in acidic conditions. Therefore, XO can be used to...

Zincon Zincon, 1-(2-Hydroxycarbonyl-phenyl)-5-(2-Hydroxy-5-sulfophenyl)-3-phenylformazan, sodium salt [CAS: 62625-22-3]
Item #: Z002 -

Product Description Zincon is a colorimetric reagent for Zn and Cu detection, and a metal indicator in EDTA titration. This reagent is insoluble in organic solvents, but slightly soluble in water and alcohol. Its proton dissociation constants are reported to be pKa1=7.9-8.3, pKa2=7.9-8.3 and pKa3=13-14. The aqueous solution of Zincon is yellow or orange-yellow in weak alkaline conditions, and turns blue in the presence of Cu (maximum wavelength: 600 nm, molar absorptivity: 1.9x104) and Zn (pH...

Zn(II)-EDTA Zn(II)-EDTA, Ethylenediamine-N,N,N’,N’-tetraacetic acid, zinc, disodium salt, tetrahydrate [CAS: 39208-16-7]
Item #: E017 -

Chemical Structure Introduction Organic compounds that coordinate metal ions into circular structures (chelate circles) are called chelating reagents. Most chelating reagents include oxygen, nitrogen, or sulfur atoms in their molecules. Chelate structures with five or six member rings form the most stable chelate circle. In chelating reactions of typical chelating reagents, such as ethylenediamine, acetylacetone, and oxine, several molecules are coordinated with one metal ion. Ethylenediamine...