Crystallographic Aspects Regarding the Insertion of Ag+ Ions into a Hydroxyapatite Structure

Santos, Ivory Marcos Gomes dos; Barbosa, Larissa Souza Noel Simas; Resende, Cristiane Xavier; Soares, Glória Dulce de Almeida; Santos, Euler Araújo dos

doi:10.1590/1516-1439.012515

Cited by 17 publications

(8 citation statements)

References 23 publications

(42 reference statements)

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“…The incorporation of silver ions was enhanced by the interaction with phosphate groups of hydroxyapatite. 22 These silver ions could be reduced to silver nanoparticles (AgNPs-HAP) by formaldehyde under strong basic conditions as shown in the TEM image of the material after formaldehyde detection (Fig. 2B).…”

Section: Resultsmentioning

confidence: 96%

“…Hydroxyapatite was synthesized via the co-precipitation from Ca(NO 3 ) 2 and H 3 PO 4 solutions at a Ca/P ratio of 1.67 22 (see ESI†). The obtained hydroxyapatite (40 mg) was modified with silver ions by mixing the material with silver nitrate solution of specified concentration (1.00 mL, pH 5.8) for 2 min.…”

Section: Methodsmentioning

confidence: 99%

“…Hydroxyapatite (HAP, Ca 10 (PO 4 ) 6 (OH) 2 ) is a non-toxic nanomaterial that has unique adsorption properties due to its high surface area to volume ratio and ion exchange properties. 22 It can be modified with silver ions via ion exchange of the calcium ions. In this manner, the modified material (Ag-HAP) contains Tollens' reagent ready for the reaction with formaldehyde.…”

Section: Introductionmentioning

confidence: 99%

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Silver-doped hydroxyapatite for formaldehyde determination by digital-image colorimetry

Pongkitdachoti

Unob

2022

Anal. Methods

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Section: Resultsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Silver-doped hydroxyapatite for formaldehyde determination by digital-image colorimetry

Pongkitdachoti

Unob

2022

Anal. Methods

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“…The data acquired include the capacitance (C), resistance (R), impedance (Z) and delay angle (θ). HA doping might generate crystal structure defects and thermal instability as stated by [15]; therefore, the experiment was conducted at different temperatures of 298, 308 and 318 K.…”

Section: Dielectric Measurementsmentioning

confidence: 99%

Influence of doping chromium ions on the electrical properties of hydroxyapatite

Ibrahim

Dawood

2020

Egyptian Journal of Basic and Applied Sciences

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Hydroxyapatite Ca 10 [PO 4 ] 6 [OH] is a biocompatible widely used in medicine and dentistry. Its applications depend greatly upon lattice substitution of Calcium sites in its structure by varies cations such as Na, Mg, Sr, Ag etc. Chromium plays an important role in reducing blood sugar level and improving insulin ability to convert glucose in cells to gain energy. In this paper we studied the effect of doping hydroxyapatite with chromium ions on its crystal dielectric properties. Pure hydroxyapatite and chromium loaded hydroxyapatite of chromium concentrations of 0.5, 1.0, 2.0, and 3.0 wt % forming samples S1, S2, S3 and S4 respectively were prepared by wet precipitation method. The dielectric parameters, permittivity ἐ, dielectric loss ἕ, conductivity σ, relaxation time t s and dielectric modulus M' and M'' were calculated at frequency of 20 Hz to 10 MHz. Results showed increase of ἐ, and ἕ, values of chromium loaded samples compared to pure hydroxyapatite. The conductivity of the doped samples was increased with chromium concentration increase. The relaxation times (t s ) chromium loaded samples showed increase of t s as chromium concentration increase. The dielectric properties showed that as chromium concentration increase, ἐ, ἕ, and σ of substance increase compared to the pure HA.

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“…Because HAp contains both cations and anions in its structure, it has high affinity for organic molecules. Moreover, Ca 2+ ions on HAp can be replaced with other cations such as Ag + , Mg 2+ , Na + , and K + causing a slight change in the a and c lattice parameters compared to the original HAp [24,26].…”

Section: Properties Of Hydroxyapatitementioning

confidence: 99%

Colorimetric detection of cysteine using silver-hydroxyapatite nanoparticles

Prasetia

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Cysteine is a sulphur-containing amino acid that acts as an effective antioxidant in human body. An excessive amount of cysteine leads to cystine formation that causes the stone formation in kidney, bladder, and ureters. A new method was developed for detection of cysteine in urine samples based on the aggregation of silver nanoparticles (AgNPs) on Hydroxyapatite (HAp) in the presence of cysteine. Transmission Electron Microscope (TEM) was used to observe the morphology of prepared HAp and AgNPs on HAp. The presence of cysteine of different concentrations resulted in different cluster sizes of AgNPs on HAp and hence different solid color. The color of the AgNPs containing HAp was observed by naked eyes and the color intensity was measured by the Image J software. To detect cysteine in urine sample, a sample preparation by extraction on cation exchange resin was introduced. The parameters affecting the analysis including extraction and elution time, concentration of Ca?? eluent solution, addition of NaOH, eluted sample volume, contact time between Ag+ and HAp, concentration of Ag+, and volume of NaBH4 were optimized. The working range of this method was in a range from 0 to 105 ?M. The standard addition method was applied to determine cysteine concentration in urine sample. The applicability of this method was then presented in terms of percent recovery and percent relative standard deviation (% RSD) which were in the range of 92.0 to 111.9 % and 1.4 to 6.9 %, respectively. The method exhibited a selectivity toward cysteine over amino acids commonly found in urine including homocysteine, methionine, and cystine.

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Crystallographic Aspects Regarding the Insertion of Ag+ Ions into a Hydroxyapatite Structure

Cited by 17 publications

References 23 publications

Silver-doped hydroxyapatite for formaldehyde determination by digital-image colorimetry

Silver-doped hydroxyapatite for formaldehyde determination by digital-image colorimetry

Influence of doping chromium ions on the electrical properties of hydroxyapatite

Colorimetric detection of cysteine using silver-hydroxyapatite nanoparticles

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