Colloidal stability of amino acid coated magnetite nanoparticles in physiological fluid

Park, Ja Young; Choi, Eunsuk; Baek, Myung Ju; Lee, Gang Ho

doi:10.1016/j.matlet.2008.10.057

Cited by 84 publications

(42 citation statements)

References 17 publications

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“…29 In this study, one amino acid with an uncharged functional group, L-ser, and two amino acids with basic functional groups, L-his and L-arg, were utilized. The isoelectric points of L-ser, L-his, and L-arg are 5.68, 7.47, and 11.15, respectively.…”

Section: Kim Et Almentioning

confidence: 99%

“…As the highly well dispersed colloidal silica nanoparticles are easily destabilized by additional treatment with chemicals, it is not a simple task to control only the surface charge without affecting the other colloidal properties. 24,[27][28][29][30][31][32] Therefore, in this work, the simplest way of coating was applied to keep the other physicochemical properties unchanged. Considering the strong negative surface charge of silica, cationic coating agents were tested: amine containing molecules, multivalent metal cation, and basic amino acids.…”

Section: Introductionmentioning

confidence: 99%

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Surface treatment of silica nanoparticles for stable and charge-controlled colloidal silica

An¹,

Kim²,

Kim³

et al. 2014

IJN

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An attempt was made to control the surface charge of colloidal silica nanoparticles with 20 nm and 100 nm diameters. Untreated silica nanoparticles were determined to be highly negatively charged and have stable hydrodynamic sizes in a wide pH range. To change the surface to a positively charged form, various coating agents, such as amine containing molecules, multivalent metal cation, or amino acids, were used to treat the colloidal silica nanoparticles. Molecules with chelating amine sites were determined to have high affinity with the silica surface to make agglomerations or gel-like networks. Amino acid coatings resulted in relatively stable silica colloids with a modified surface charge. Three amino acid moiety coatings (L-serine, L-histidine, and L-arginine) exhibited surface charge modifying efficacy of L-histidine > L-arginine > L-serine and hydrodynamic size preservation efficacy of L-serine > L-arginine > L-histidine. The time dependent change in L-arginine coated colloidal silica was investigated by measuring the pattern of the backscattered light in a Turbiscan™. The results indicated that both the 20 nm and 100 nm L-arginine coated silica samples were fairly stable in terms of colloidal homogeneity, showing only slight coalescence and sedimentation.

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Section: Kim Et Almentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface treatment of silica nanoparticles for stable and charge-controlled colloidal silica

An¹,

Kim²,

Kim³

et al. 2014

IJN

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“…The addition of basic organic compounds such as L-arginine stabilized magnetite nanoparticles [15][16]. To attach organic functional groups on the magnetite coated silica, a coupling agent is needed.…”

Section: Introductionmentioning

confidence: 99%

Coating of L-Arginine Modified Silica on Magnetite through Two Different Sol-Gel Routes

2017

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“…a vérben pH ~7,2 -7,4; 0,15 mol/dm 3 NaCl) (Fauconnier et al, 1999;Gonzalez et al, 2002;Şincai et al, 2002;Park et al, 2009). A csupasz magnetit nanorészecskék nem teljesítik ezt a feltételt, így a részecskék felületét módosítani kell, hogy elérjük a MF-ok elvárt kolloidstabilitását.…”

Section: Bevezetésunclassified

“…A vizes közegű mágneses folyadékok nem stabilak a fiziológiás körülmények között (pH ~7,2 -7,4; 0,15 mol/dm 3 NaCl), így szükség van a kolloidstabilitásuk növelésére (Fauconnier et al, 1999;Gonzalez et al, 2002;Şincai et al, 2002;Park et al, 2009). A magnetit nanorészecskék felületmódosítása számos funkciós csoporton keresztül történhet, ezek egy részét a 2.7. ábrán mutatom be (Boyer et al, 2010).…”

Section: Mágneses Vas-oxid Nanorészecskék Felületmódosításaunclassified

Méretvariált magnetit nanorészecskék előállítása és felületmódosítása polianionos védőrétegekkel

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Colloidal stability of amino acid coated magnetite nanoparticles in physiological fluid

Cited by 84 publications

References 17 publications

Surface treatment of silica nanoparticles for stable and charge-controlled colloidal silica

Surface treatment of silica nanoparticles for stable and charge-controlled colloidal silica

Coating of L-Arginine Modified Silica on Magnetite through Two Different Sol-Gel Routes

Méretvariált magnetit nanorészecskék előállítása és felületmódosítása polianionos védőrétegekkel

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