Effect of salt concentration on the electrical and morphological properties of calcium phosphates obtained via microwave-induced combustion synthesis

Lopera, Alex; Chavarriaga, E. A.; Zuluaga, Beatriz Helena Aristizábal; Marin, Sandra Patricia; Giraldo, G.O.; Estupiñán, Hugo Armando; Zapata, V.H.; García, Cristhian

doi:10.1016/j.apt.2017.08.007

Cited by 12 publications

(1 citation statement)

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“…For instance, calcium phosphates are used as ocular implants allowing eye movement [4], nanosystems for photodynamic therapy, contrast agents for multimodal imaging [5], drug delivery systems [6], vaccine adjuvants, and antifungal agents [3]. Calcium phosphates are also present in the manufacturing of biosensors [7] and have great attraction for binding with active substances, namely proteins, antigens, vaccines, and immunogens [8,9]. Under specific conditions, including temperature, humidity, and the presence of impurities, biological calcium phosphates exist in different aspects and morphology [10].…”

Section: Introductionmentioning

confidence: 99%

Entrapment of organic fluorophores in calcium phosphate nanoparticles with slow release

Sadallah¹,

Boukhris²,

Hannache³

et al. 2020

Turk J Chem

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Two organic fluorophores, fluorescein (F) and rhodamine B (Rd), were entrapped in calcium phosphate nanoparticles. The as-obtained nanoparticles can be used for biological release applications. For this aim, calcium phosphate nanoparticles were synthesized using the precipitation method. Structural analysis of these nanoparticles was performed using XRD, FTIR, and Raman spectroscopy, confirming that the synthesized nanoparticles were hydroxyapatite. TEM and SEM analyses demonstrated that these nanoparticles had a size of 20 nm and a well-defined morphology. F and Rd (about 0.5 wt.%) were entrapped in these nanoparticles and their release, as a function of time, was studied via UV-Vis spectroscopy. The obtained results showed that the release of both fluorophores was progressive over time. The trapping efficiencies of the fluorophores were 67.15% and 90.76% for F and Rd, respectively.

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