Lippia sidoides essential oil encapsulation by angico gum/chitosan nanoparticles
In: Journal of the Brazilian Chemical Society, Volume: 21, Issue: 12, Pages: 2359-2366, Published: DEC 2010 Journal of the Brazilian Chemical Society v.21 n.12 2010 Journal of the Brazilian Chemical Society Sociedade Brasileira de Química (SBQ) instacron:SBQ; (2010-12-01)
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Zugriff:
Chitosan (CH) and angico gum (AG) nanoparticles were loaded with essential oil, Lippia sidoides (Ls), being characterized according to their composition, size distribution, Ls:polymer ratio, thermal stability and in vitro and in vivo controlled release. Nanoparticles prepared using Ls:AG ratios of 1:2 to 1:20 had loading values of 3.3 to 7.7%, with encapsulation efficiencies in the range of 16.0 to 77.8%. Particle sizes were in the range of 10-60 nm and size distributions were independent of Ls content, for different Ls:AG ratios. Infrared spectroscopy revealed the presence of thymol in the nanoparticles. TGA and DSC revealed that the degradation temperature of AG-CH nanoparticles decreased with an increase in Ls content. Controlled-release data showed a slower release profile for samples with Ls:AG = 1:10 than for the other samples. Bioassays showed that sample Ls:AG = 1:10 has a greater larvicidal effect, with 85 ± 3% mortality. Nanoparticulas de quitosana (CH) e goma do angico (AG), dopadas com óleo essencial de Lippia sidoides (Ls) foram preparadas e caracterizadas em relação às suas composições, distribuição de tamanho de partículas, estabilidade térmica, bem como as liberações in vitro e in vivo. Os dados obtidos revelaram que as nanopartículas preparadas usando razões Ls:AG variando de 1:2 a 1:20, apresentaram dopagens na faixa de 3,3 a 7,7%, com eficiência de encapsulação entre 16,0 e 77,8%. Os tamanhos de partículas ficaram na faixa de 10-60 nm, com distribuições independentes do teor de óleo incorporado. FTIR revelou a presença de timol, principal componente de Ls. Análises de TGA e DSC mostraram que a incorporação de óleo na matriz resulta em nanopartículas de menor estabilidade térmica. A amostra Ls: AG = 1:10 apresentou um perfil de liberação in vitro mais lento que as demais, exibindo, porém, nos bioensaios, uma maior mortalidade larval.
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Lippia sidoides essential oil encapsulation by angico gum/chitosan nanoparticles
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Autor/in / Beteiligte Person: | Regina C. M. de Paul ; Sombra, Fernanda M. ; Flávia Oliveira Monteiro da Silva Abreu ; Haroldo C.B. Paula |
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Quelle: | Journal of the Brazilian Chemical Society, Volume: 21, Issue: 12, Pages: 2359-2366, Published: DEC 2010 Journal of the Brazilian Chemical Society v.21 n.12 2010 Journal of the Brazilian Chemical Society Sociedade Brasileira de Química (SBQ) instacron:SBQ; (2010-12-01) |
Veröffentlichung: | Sociedade Brasileira de Química, 2010 |
Medientyp: | unknown |
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