PubMed Health⌕ Search

Biomedical subjects

Tony D James

Publications and source records attributed to Tony D James.

12 recordsLinked to original sources
PubMed2006

Simple protocol for NMR analysis of the enantiomeric purity of diols.

[reaction: see text] A practically simple three-component chiral derivatization protocol for determining the enantiopurity of chiral 1,2-, 1,3-, and 1,4-diols by (1)H NMR spectroscopic analysis is described. The method involves treatment with 2-formylphenylboronic acid and enantiopure alpha-methylbenzylamine to afford a mixture of diastereoisomeric iminoboronate esters whose ratio is an accurate reflection of the enantiopurity of the parent diol.

Journal Article↗
PubMed2004

A ditopic fluorescent sensor for potassium fluoride.

The addition of potassium fluoride 'switches on' the fluorescence of sensors and while potassium chloride and bromide cause no fluorescence change; the fluorescence can be 'switched off' by removing the potassium cation from the benzocrown ether receptors of sensors and through the addition of [2.2.2]-cryptand and restored by the addition of the potassium cation as potassium chloride.

Boron Compounds↗
PubMed2004

An enantioselective fluorescent sensor for sugar acids.

Chiral fluorescent boronic acid 1 was found to be a highly enantioselective, chemoselective, and sensitive sensor for sugar acids, such as tartaric acid. Enantioselectivities (K(R)/K(S)) of up to 550:1, chemoselectivity up to 11,000:1, and sensitivities in the micromolar range with sensor 1 were observed. Single-crystal X-ray analysis was used to confirm the structure of the fluorescent species.

Boronic Acids↗
PubMed2004

Boronic acid based modular fluorescent sensors for glucose.

Modular photoinduced electron transfer (PET) sensors bearing two phenylboronic acid groups, one or two fluorophores: pyrene(a), phenanthrene(b), anthracene(c), 1-naphthalene(d), 2-naphthalene(e) and alkylene linkers, from trimethylene(3) to octamethylene(8), have been evaluated. Systems with a single pyrene fluorophore 34a, 35a and 36a bind the strongest with D-glucose (36a also binds well with D-melibiose). Whilst 37a and 38a bind the strongest with D-galactose. Changing the fluorophore, also, influences the binding, 36a, 36b and 36c are D-glucose selective, whilst 36d and 36e are D-galactose selective. Systems with two fluorophores 36a-a and 36a-b show an overall decrease in binding efficiency. Energy transfer in 36a-b results in enhanced sensitivity and selectivity towards D-glucose.

Biosensing Techniques↗
PubMed2002

Molecular color sensors for monosaccharides.

[structure: see text] Boronic acid color sensor 2 undergoes a visible color change, from purple to pink, on the addition of monosaccharides in aqueous methanol at pH 8.21.

Aniline Compounds↗