Preparation and Characterization of Heat Sensitive Color‐developing Microcapsules

Ba, Xinwu; An, Puying; Lü, Shuang; Liu, Guangtian

doi:10.1002/cjoc.200990193

Cited by 3 publications

(1 citation statement)

References 21 publications

(20 reference statements)

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“…Effects of the emulsifier content on the particle size distribution: The particle size of each microcapsule depends on the size of the dispersed droplet, which is determined by the used emulsifiers and the emulsifying conditions 23 . To study the effects of the emulsifier content on the particle size and particle size distribution of microcapsules, the emulsifier contents vary from 1.0% to 2.5%.…”

Section: Resultsmentioning

confidence: 99%

Untitled

2017

IJPSR

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ABSTRACT:The pH/temperature sensitive microcapsules were prepared by inverse emulsion polymerization, in which sodium alginate (SA) and N-isopropyl acrylamide (NIPAm) were used as the wall material and pentoxifylline as a model drug. The effects of the emulsifier content on the particle size distribution and drug release property of microcapsules were discussed in detail. The structure, morphology, particle size and its distribution of microcapsules were characterized by Fourier transform infrared spectrophotometry (FTIR), scanning electron microscopy (SEM), transmission electron microscope (TEM), Malvern particle size analysis and UV-vis spectrophotometer. The release behavious of pentoxifylline in different phosphate buffered saline (PBS) pH were investigated systematically. The results showed that the resultant microcapsules had narrower particle size distribution, smoother surface and higher drug release amount with the percentage weight of emulsifier being 2.0%. The TEM photograph exhibited that the microcapsules had core and shell structures. The drug-release behavior of pentoxifylline from microcapsules was evaluated as a function of pH/temperature. The results indicated that these drug-loaded microcapsules have shown sensitivity to pH value and temperature.

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Section: Resultsmentioning

confidence: 99%

Untitled

2017

IJPSR

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Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Hedaoo

Tatiya

Mahulikar

et al. 2013

Designed Monomers and Polymers

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New sequence of microcapsules with dendritic PAMAM-based novel polyurea as shell wall material containing herbicide as a core moiety has been prepared by interfacial polymerization technique. Dendrimer-based polymeric microcapsules were fabricated with aim to study the effect of different reaction parameters such as surfactant dose, core loading, agitation speed, and amount of solvent on particle size, particle size distribution, and appearance of microcapsules. Prepared microcapsules were characterized by FTIR, thermo gravimetric analysis, particle size analysis, scanning electron microscope, and other microscopic technique. In present investigation, surfactant dose of 2.5% with 5 mL of solvent at 400 rpm was found to be optimum for fabrication of stable new polyurea microcapsules containing 1 g of core. The synthesized microcapsules with optimized parameters were evaluated quantitatively for controlled release study by gas chromatography in different environmental conditions. The highest percent release of core was found in acidic conditions compared to that of basic and least in neutral medium.

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