Modulation of starch nanoparticle surface characteristics for the facile construction of recyclable Pickering interfacial enzymatic catalysis

A facile and effective method for the Pickering emulsion polymerization of acrylate monomer is reported, using SNPs as the sole stabilizer. The SNPs were produced via ultrasonication in water without any chemical additives.

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Breadfruit-Based Starch Nanoparticles Prepared Using Nanoprecipitation to Stabilize a Pickering Emulsion

Journal of Southwest Jiaotong University ◽

10.35741/issn.0258-2724.56.3.31 ◽

2021 ◽

Vol 56 (3) ◽

pp. 372-383

Author(s):

Bovi Wira Harsanto ◽

Yudi Pranoto ◽

Supriyanto ◽

Indriana Kartini

Keyword(s):

Size Distribution ◽

Amorphous State ◽

Pickering Emulsion ◽

High Enthalpy ◽

Particle Characteristics ◽

Mean Size ◽

Bioactive Ingredients ◽

Starch Nanoparticles ◽

Type Crystal

This research describes the role of starch nanoparticles in stabilizing the surfactant-free emulsion, namely Pickering emulsion. However, the concentration of starch and NaOH during the preparation of starch nanoparticles as a Pickering emulsifier have not been studied. Thus, this study aimed to obtain the proper concentrations of starch and NaOH when preparing breadfruit-based starch nanoparticles as emulsifiers for a Pickering emulsion. This study varied the concentration of starch (1, 3,or 5 (%(w/v)) and NaOH (0.1875 and 0.375 M) to form a starch dispersion. Starch nanoparticles were acquired through the interactions between the solvent (starch dispersion) and the non-solvent (ethanol) during nanoprecipitation. Then, the starch nanoparticles were evaluated for particle characteristics and emulsifier properties in a Pickering emulsion during two weeks of storage. As a result, the mixture of 5% starch and 0.1875 M NaOH produces breadfruit starch nanoparticles with the smallest size distribution (mean size: 123 nm), amorphous state (V-type crystal pattern), high enthalpy (259.02 J/g), and the best emulsifier properties for a Pickering emulsion, which was stable for two weeks. These results develop knowledge about the potency of breadfruit-based starch nanoparticles using 5% starch with 0.1875 M NaOH in the food emulsion field, particularly to encapsulate bioactive ingredients in a Pickering emulsion.

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Medial Smooth Muscle Cell Proliferation in the Balloon Injured Rabbit Aorta: Effect of a Thiazole Compound with Platelet Inhibitory Activity

Thrombosis and Haemostasis ◽

10.1055/s-0038-1661024 ◽

1984 ◽

Vol 51 (01) ◽

pp. 075-078 ◽

Cited By ~ 8

Author(s):

R G Schaub ◽

C A Simmons

Keyword(s):

Smooth Muscle ◽

Platelet Aggregation ◽

Balloon Catheter ◽

Rabbit Aorta ◽

Surface Characteristics ◽

Inhibitory Effect ◽

Lesion Size ◽

Blue Staining ◽

Morphologic Characteristics ◽

Time Period

SummaryTwenty-seven adult male New Zealand rabbits (3–4 kgs) were used in this study. Six rabbits received vehicle, 3 groups of 6 each received doses of 4,5-bis(p-methoxyphenyl)-2-(trifluoromethyl)- thiazole, (U-53,059), at 0.3 mg/kg, 3.0 mg/kg and 30.0 mg/kg/day respectively. Drug and vehicle doses were given orally each day starting 3 days before balloon injury and continuing for the entire 2 week time period. Three rabbits were used as nontreated sham controls. In the vehicle and U-53,059 treated groups aortae were denuded of endothelial cells by balloon catheter injury. Two weeks after injury platelet aggregation to collagen was measured and the aortae removed for analysis of surface characteristics by scanning electron microscopy and lesion size by morphometry. All doses of U-53,059 inhibited platelet aggregation. The 3.0 and 30.0 mg/kg groups had the greatest inhibitory effect. All balloon injured aortae had the same morphologic characteristics. All vessels had similar extent and intensity of Evan’s blue staining, similar areas of leukocyte/platelet adhesion, and a myointimal cell cover of transformed smooth muscle cells. The myointimal proliferative response was not inhibited at any of the drug doses studied.

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Photocatalytic activity of TiO2 synthesized by anodization and anodic spark deposition

MRS Advances ◽

10.1557/adv.2020.405 ◽

2020 ◽

Vol 5 (61) ◽

pp. 3141-3152

Author(s):

Alma C. Chávez-Mejía ◽

Génesis Villegas-Suárez ◽

Paloma I. Zaragoza-Sánchez ◽

Rafael Magaña-López ◽

Julio C. Morales-Mejía ◽

...

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Surface Characteristics ◽

Amorphous Solids ◽

X Ray Diffraction ◽

X Ray ◽

Catalytic Activities ◽

Anodic Spark Oxidation ◽

Porous Surfaces ◽

Scanning Electron

AbstractSeveral photocatalysts, based on titanium dioxide, were synthesized by spark anodization techniques and anodic spark oxidation. Photocatalytic activity was determined by methylene blue oxidation and the catalytic activities of the catalysts were evaluated after 70 hours of reaction. Scanning Electron Microscopy and X Ray Diffraction analysis were used to characterize the catalysts. The photocatalyst prepared with a solution of sulfuric acid and 100 V presented the best performance in terms of oxidation of the dye (62%). The electric potential during the synthesis (10 V, low potential; 100 V, high potential) affected the surface characteristics: under low potential, catalyst presented smooth and homogeneous surfaces with spots (high TiO2 concentration) of amorphous solids; under low potential, catalyst presented porous surfaces with crystalline solids homogeneously distributed.

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