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S Bone

Publications and source records attributed to S Bone.

26 records · Page 2Linked to original sources
PubMed1978

Electronic properties of some protein--methylglyoxal complexes.

Steady-state conductivity measurements and dielectric measurements in the frequency range 10(-5) to 100 Hz are reported for samples of bovine serum albumin, casein, and lysozyme complexed with methylglyoxal. Compared with the untreated proteins, the brown complexed proteins exhibit an increased conductivity and free electron spin density, together with a low-frequency dielectric dispersion. These results can be taken as evidence that the interaction with methylglyoxal results in the proteins possessing an increased electronic activity associated with the creation of mobile electron holes within the valence band states of the protein molecules.

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PubMed1978

Electronic and dielectric properties of protein--methylglyoxal complexes.

Steady-state conduction and dielectric measurements over the frequency range 10(-5) to 10(5) Hz are reported for several proteins that have been complexed with methylglyoxal. Compared with the normal (white) proteins the brown protein--methylglyoxal complexes exhibit a marked increase in electronic conductivity and a pronounced low-frequency dielectric dispersion. The intensity of the brown colour and the electronic activity is directly related to the number of free lysine groups available to react with the methylglyoxal. It is proposed that the methylglyoxal molecules form Schiff bases with the epsilon-amino groups of lysine residues and that these Schiff bases then form a charge-transfer complex with a neighbouring peptide unit. For collagen, in particular, it is found that the electron 'holes' so formed in the polypeptide backbone are capable of long range motion in what can be interpreted as being the valence band of extended electronic states of the protein structure. The protein--methylglyoxal complexes have electronic and dielectric properties similar to those exhibited by the perylene-chloranil charge-transfer complex.

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