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Effect of the oligodimethylsiloxane chain length and concentration of carboxyl groups on the colloidal chemical properties and characteristics of polymethyl methacrylate suspensions. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3480-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Istratov VV, Krupina TV, Gomzyak VI, Vasnev VA. Development and characterization of bioresorbable polyglycerol esters and drug-loaded microparticles. HIGH PERFORM POLYM 2017. [DOI: 10.1177/0954008317702208] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Linear-hyperbranched co(polylactides) containing hyperbranched polyglycerol (PG) block were synthesized and characterized. An estimate of critical micelle concentration as well as aggregative stability and droplet sizes in the emulsion stabilized by the obtained polymers was made. It was shown that an architecture of linear-branched co(polylactides) defines its surface-active properties and characteristics of dispersion systems obtained from it. With an increase in PG block content in copolymers, critical micelle concentration and aggregative stability of emulsions increase. Polylactide microparticles were obtained by organic solvent evaporation technique using acetylsalicylic acid as a drug model. Some properties of microparticles, such as size, incorporation efficiency and in vitro release of immobilized substance, were examined. It was noticed that branching architecture of co(polylactides) has a significant influence on the properties of microparticles. On the one hand, the presence of large PG blocks in linear-branched macromolecules results in the formation of colloidal systems with higher aggregative stability of emulsions and smaller particle size; on the other hand, microparticles formed from such copolymers have lower incorporation efficiency towards water-soluble low-molecular-weight compounds and nonlinear release profile for these substances with a segment of accelerated primary release.
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Affiliation(s)
- Vladislav V Istratov
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia
| | - Tatiyana V Krupina
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia
| | | | - Valeriy A Vasnev
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia
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