A New Colorimetric Reagent for Titanium

Yoe, John H.; Armstrong, Alfred R.

doi:10.1126/science.102.2643.207

Cited by 12 publications

(3 citation statements)

References 1 publication

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“…Quantitation of Residual Titanium in Supernatant. The supernatant after the precipitation reaction was analyzed for residual titanium by using a spectrophotometric analytical assay. , A modified procedure using the method of standard additions was employed. Final solutions (1 mL total volume) contained 0.4% Tiron, between 0 and 32 μM Ti from a titanium atomic absorption standard, and 10 μL of supernatant solution in 1.5 M sodium acetate buffer (pH ∼5.2).…”

Section: Methodsmentioning

confidence: 99%

Peptide- and Long-Chain Polyamine- Induced Synthesis of Micro- and Nanostructured Titanium Phosphate and Protein Encapsulation

et al. 2006

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Poly(allylamine) (a mimic of biopolyamines) and the R5 peptide (a repeat unit of a silaffin protein isolated from a diatom) induce the formation of mineralized titanium from soluble titanium(IV) precursors. These reactions proceed under mild aqueous conditions. Scanning electron microscopy shows that the nanometer to micrometer diameter particles induced by poly(allylamine) are spherical under a range of conditions, while those induced by the R5 peptide include spheres and fused structures. Dynamic light scattering experiments confirm the SEM results and reveal that the particles range in size from 2 nm to 5 μm. The surface charge is negative at neutral pH. Energy dispersive X-ray spectroscopy shows the composition to be primarily titanium, oxygen, and phosphorus. The solids are amorphous at room temperature by powder X-ray diffraction but the material induced by poly(allylamine) converts to cubic crystalline TiP2O7 with annealing to 800 °C. Infrared spectroscopy suggests that the biomolecule mineralization inducers are encapsulated in the solid. Discrete poly(allylamine)-induced spheres are formed only between pH 7−9.5, with polydispersity strongly dependent on pH. The surface of the poly(allylamine)-induced spheres becomes smoother at higher reaction temperatures. Green fluorescent protein can be immobilized in the solid induced by poly(allylamine) but not R5 peptide under the conditions examined.

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Section: Methodsmentioning

confidence: 99%

Peptide- and Long-Chain Polyamine- Induced Synthesis of Micro- and Nanostructured Titanium Phosphate and Protein Encapsulation

et al. 2006

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“…Secondly, a colourimetric assay was employed to support the turbidity data. Similar to the TIRON assay 18,32,33 , we centrifuged the samples to pellet the material. When the clear supernatant containing unreacted TiBALDH is mixed with an excess of dhba (or similar catechol), the molecule [Ti(dhba) 3 ] 2 À results which yields a yelloworange solution, l max ¼ 380 nm (E ¼ 3,345 M À 1 cm À 1 ).…”

Section: Methodsmentioning

confidence: 99%

Photoinitiated charge separation in a hybrid titanium dioxide metalloporphyrin peptide material

et al. 2014

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In natural systems, electron flow is mediated by proteins that spatially organize donor and acceptor molecules with great precision. Achieving this guided, directional flow of information is a desirable feature in photovoltaic media. Here, we design self-assembled peptide materials that organize multiple electronic components capable of performing photoinduced charge separation. Two peptides, c16-AHL 3 K 3 -CO 2 H and c16-AHL 3 K 9 -CO 2 H, self-assemble into fibres and provide a scaffold capable of binding a metalloporphyrin via histidine axial ligation and mineralize titanium dioxide (TiO 2 ) on the lysine-rich surface of the resulting fibrous structures. Electron paramagnetic resonance studies of this self-assembled material under continuous light excitation demonstrate charge separation induced by excitation of the metalloporphyrin and mediated by the peptide assembly structure. This approach to dye-sensitized semiconducting materials offers a means to spatially control the dye molecule with respect to the semiconducting material through careful, strategic peptide design.

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“…1) allows for improved water solubility as well as reduced polymerization by substituting electron-withdrawing sulfonic acid moieties (Sommer, 1963a,b). Tiron has long been used for colorimetric determination of both Ti IV and Fe III (Yoe & Armstrong, 1945, 1947, hence its name.…”

Section: Chemical Contextmentioning

confidence: 99%

Crystal structures of sodium-, lithium-, and ammonium 4,5-dihydroxybenzene-1,3-disulfonate (tiron) hydrates

et al. 2018

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A New Colorimetric Reagent for Titanium

Cited by 12 publications

References 1 publication

Peptide- and Long-Chain Polyamine- Induced Synthesis of Micro- and Nanostructured Titanium Phosphate and Protein Encapsulation

Peptide- and Long-Chain Polyamine- Induced Synthesis of Micro- and Nanostructured Titanium Phosphate and Protein Encapsulation

Photoinitiated charge separation in a hybrid titanium dioxide metalloporphyrin peptide material

Crystal structures of sodium-, lithium-, and ammonium 4,5-dihydroxybenzene-1,3-disulfonate (tiron) hydrates

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