A comparative study of peripheral and non-peripheral zinc (II) phthalocyanines incorporated into mesoporous silica nanoparticles

Zeballos, N.C. López; Vior, María C. García; Awruch, Josefina; Dicelio, Lelia E.

doi:10.1016/j.dyepig.2014.08.004

Cited by 8 publications

(2 citation statements)

References 23 publications

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“…Several materials have been used to prepare Pickering emulsions [21][22][23][24][25]; among them, silica is the most popular, because its surface is easily modified, either by chemical reaction or by physical adsorption of various compounds such as salts, low molecular weight surfactants, polymers and pigments and natural polyphenols, among others [25][26][27][28][29][30][31][32]. In particular, different types of silica materials (MCM-41, SBA-16, etc.)…”

Section: Introductionmentioning

confidence: 99%

Carminic Acid Linked to Silica Nanoparticles as Pigment/Antioxidant Bifunctional Excipient for Pharmaceutical Emulsions

et al. 2020

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The incorporation of pigments and natural polyphenols into inorganic matrices, resulting in a hybrid material that improves the resistance and chemical stability of the pigments and the antioxidant capacity of the materials, has been of great interest to the pharmaceutical, chemical and food industries. The aim of this work was to prepare and characterize a bifunctional pigment–antioxidant nanomaterial-based carminic acid-decorated solid core-mesoporous shell silica nanoparticles, evaluating its properties as a pigment, its antioxidant capacity and its properties as a chemical stabilizer of emulsions. The chemical stability of oil-in-water (O/W) Pickering emulsions was evaluated determining the stability of vitamin E solubilized in the oil phase. Carminic acid was attached through the action of coupling ethylcarbodiimide hydrochloride (EDC)/N-hydroxysuccinimide (NHS) agents, and the resulting spherical and homogeneous nanoparticles showed a diameter close to 175 nm. A notorious change of emulsion color was observed by the addition of the nanomaterial. Emulsions showed an attractive pink color, and when the pH was adjusted to pH 3 and pH 9, a change in color was observed, analogous to carminic acid in solution. The nanomaterial incorporation also improved chemical stability, decreasing vitamin E consumption to 9.26% of the initial value, demonstrating an important antioxidant effect of the developed nanomaterial.

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Section: Introductionmentioning

confidence: 99%

Carminic Acid Linked to Silica Nanoparticles as Pigment/Antioxidant Bifunctional Excipient for Pharmaceutical Emulsions

et al. 2020

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“…2,23,24 It is also possible to obtain zinc and silica composite coatings from silica nanoparticles or a silicon-containing zinc solution using electroplating or sintering methods. [25][26][27][28][29] Electrodeposition is an effective method to obtain silica-containing zinc coatings with better protection performance on steel substrates. 30 The silica particles, which become embedded in the zinc coating, contribute to the dimensional stabilization of the protective zinc layer.…”

Section: Introductionmentioning

confidence: 99%