Effect of sodium dodecyl sulfate on folding and thermal stability of acid‐denatured cytochrome c: A spectroscopic approach

Xu, Qi; Keiderling, Timothy A.

doi:10.1110/ps.04827604

Cited by 100 publications

(80 citation statements)

References 56 publications

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“…[5,10,14]; (b) a 'rod-like' prolate ellipsoidal surfactant aggregate with a semi-minor axis of ∼18Å, corresponding to the surfactant chain length [1,6] and (c) a flexible capped helical cylinder micelle with the protein wrapping around the micelles [15]. The structures of some globular protein (such as BSA, ovalbumin, cytochrome c, papain) complexes with SDS were found by neutron scattering, NMR and spectroscopic studies to be consistent with different versions of the necklace and bead description of protein-surfactant aggregates [5,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 77%

Effect of surfactants on casein structure: A spectroscopic study

Chakraborty

Basak

2008

Colloids and Surfaces B: Biointerfaces

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Section: Introductionmentioning

confidence: 77%

Effect of surfactants on casein structure: A spectroscopic study

Chakraborty

Basak

2008

Colloids and Surfaces B: Biointerfaces

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“…VCD is quite sensitive to conformational changes of chiral molecules, induced for example by different solvents. In the case of chiral molecules in direct micelles or vesicles VCD has been used for peptides [10] and proteins [11].…”

Section: Introductionmentioning

confidence: 99%

Confinement of chiral molecules in reverse micelles: FT-IR, polarimetric and VCD investigation on the state of dimethyl tartrate in sodium bis(2-ethylhexyl) sulfosuccinate reverse micelles dispersed in carbon tetrachloride

Abbate

Longhi

Ruggirello

et al. 2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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a b s t r a c tThe state of d and l-dimethyl tartrate confined within dry sodium bis(2-ethylhexyl) sulfosuccinate (AOT) reverse micelles dispersed in CCl 4 has been investigated by FT-IR spectroscopy, polarimetry, and vibrational circular dichroism (VCD). Measurements have been performed at 25 • C as a function of the solubilizate-to-surfactant molar ratio (R) at a fixed AOT concentration (0.158 M). The analysis of experimental data is consistent with the hypothesis that both enantiomers of dimethyl tartrate are mainly entrapped in the reverse micelles and located in proximity to the surfactant head-group region. The formation of this interesting self-organized chiral nanostructure involves some changes of the typical H-bonding of dimethyl tartrates in the pure solid state or as monomers dispersed in CCl 4 attributable to the establishment of specific solubilizate/surfactant head-group interactions and confinement effects.

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“…However, when SDS (Figure 4) is present, we found instead a variety of magnetite morphologies, which appear to have biogenic trademarks. SDS (Figure 4) is commonly used to mimic hydrophobic binding environments such as cell membranes [15] and has been used to study the folding and thermal stability of cytochrome c (cyt c), which is a biologically important electron transfer system [16]. The synthesis of magnetite in the presence of SDS under hydrothermal conditions yielded a variety of magnetite morphologies, as revealed by SEM and TEM.…”

Section: Resultsmentioning

confidence: 99%

Electron Microscopy of Anionic Surfactant-Directed Synthesis of Magnetite Nanoparticles

Malik¹,

Hewitt²,

Powell³

2016

ChemJMold

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Abstract. Here we report new work on the synthesis and an electron microscopy study of the earliest known magnetic material, magnetite (Fe 3 O 4 ). We have synthesized a variety of magnetite nanoparticles which appear to have biogenic signatures and could give insights into how the nanomagnetite in biological systems forms, and how they may be associated with Alzheimer's disease. We have also synthesized mesoporous magnetite nanoparticles which have potential use in the targeted drug delivery.Keywords: magnetite, magnetic nanoparticles, hydrothermal synthesis, drug delivery. IntroductionMagnetite (Fe 3 O 4 ) in the form of lodestone is the original magnetic material used by mankind to navigate the Earth by following geomagnetic fi eld lines. It is also used for navigation in Nature by honey bees, homing pigeons and bacteria. Currently, magnetic nanoparticles are used for data storage, magnetic resonance imaging (MRI) and are the potential colloidal mediators for cancer magnetic hyperthermia. This area of nanotechnology spans the boundaries of chemistry, biology, medicine and materials science.The earliest reported medical use of magnetite powder for internal applications was in the 11th century A.D. by the Persian physician and philosopher Avicenna of Bokhara [1,2]. Today magnetic nanoparticles are used for magnetic resonance imaging (MRI) and as colloidal mediators for magnetic hyperthermia cancer treatment [3].In 1992, it was reported that magnetite (Fe 3 O 4 ) is present in the human brain [4] and more recently that nanoscale biogenic magnetite is associated with neurodegenerative diseases such as Alzheimer's [5]. Although this association was fi rst discovered over fi fty years ago by Goodman [6], to date the magnetite's origin and formation are not certain. Here we show that the synthesis of magnetite in the presence of the surfactant sodium dodecyl sulphate (SDS) gives rise to a variety of nanoscale morphologies, some of which look remarkably similar to magnetite found in organisms, suggesting that similar processes may be involved. Furthermore, these 0D materials with nanoscale dimensions and with the potential to show quantum confi nement effects are of interest in the areas of biosensors [7], biomedical imaging [8] and as tunneling magnetoresistance (TRM) sensor elements in magnetic random access memory (MRAM) confi gurations, which can be used to form magnetic, programmable biochips [9].In the more extensively studied magnetotactic bacteria [10], biogenically controlled morphologies of magnetite, which normally crystallises in a cubic space group, occur in the form of nanocrystals.These have been found to have elongated {111} axes often with rhombic or truncated dodecahedral morphology. They are part of intracellular structures called magnetosomes [11], which consist of a nanocrystal surrounded by a lipid bilayer membrane. They arrange in a 1D array to form a "compass needle", which is utilised by the bacteria to sense the Earth's magnetic fi eld [12,13]. Figure 1 shows two typical examples of these m...

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Effect of sodium dodecyl sulfate on folding and thermal stability of acid‐denatured cytochrome c: A spectroscopic approach

Cited by 100 publications

References 56 publications

Effect of surfactants on casein structure: A spectroscopic study

Effect of surfactants on casein structure: A spectroscopic study

Confinement of chiral molecules in reverse micelles: FT-IR, polarimetric and VCD investigation on the state of dimethyl tartrate in sodium bis(2-ethylhexyl) sulfosuccinate reverse micelles dispersed in carbon tetrachloride

Electron Microscopy of Anionic Surfactant-Directed Synthesis of Magnetite Nanoparticles

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