The rational design of emulsions requires study of the main factors that influence their formation, physicochemical properties and, consequently, stability and performance. The use of vegetable oils in the pharmaceuti...The rational design of emulsions requires study of the main factors that influence their formation, physicochemical properties and, consequently, stability and performance. The use of vegetable oils in the pharmaceutical and cosmetic industries has recently become attractive. Dipteryx alata Vogel(D. alata) is an oleaginous species native to Brazil. The seeds of this species contain highly unsaturated oil with significant amounts of tocopherols and phytosterols, representing an important source of agents capable of combatting oxidative processes. In this work, a lamellar gel phase emulsion using oil extracted from the seeds of D. alata(baru) was developed. The steps involved in the development of this research were as follows: 1) development of formulations and 2) in vitro assays by simulating the evaporation of the final product after application to the skin and Electron paramagnetic resonance spectroscopy(EPR) of fatty acid spin labels was used to investigate the profile of interaction of the dispersed systems with stratum corneum(SC) lipids. The results indicate that the developed system shows no signs of instability during the storage period. Moreover, EPR studies indicated that D. alata oil and especially the developed formulation were able to increase SC lipid fluidity and extract a fatty-acid spin label from the lipid domain structures of SC, demonstrating its potential to act as a drug or skin care vehicle.展开更多
目的使用传统指标和FT-IR技术评价乳剂稳定性。方法通过两步乳化法制备O/W乳剂,以平均粒径、离心稳定常数及表面张力3个指标对乳剂进行表征。用浸渍法分别测定水相、油相和乳剂的傅里叶变换红外光谱(FT-IR)图,再用软件origin 7.5对水相...目的使用传统指标和FT-IR技术评价乳剂稳定性。方法通过两步乳化法制备O/W乳剂,以平均粒径、离心稳定常数及表面张力3个指标对乳剂进行表征。用浸渍法分别测定水相、油相和乳剂的傅里叶变换红外光谱(FT-IR)图,再用软件origin 7.5对水相和乳剂的羟基峰进行去卷积,根据最小二乘法拟合出组成羟基峰的高斯曲线。结果 2个乳剂的平均粒径分别为155.9 nm和138.5 nm,离心稳定常数分别为0.377和0.561,表面张力分别为54.22 m N/m和64.80 m N/m;制成乳剂后,FT-IR图中油相的信号峰几乎完全消失,而水相和乳剂的FT-IR图中,羟基峰均由6条高斯曲线组成,乳剂中5条高斯曲线的峰位对比于水相都发生了蓝移。结论定量的传统指标和定性的FT-IR技术相结合,可以更好地评价乳剂的稳定性。展开更多
基金supported by CAPES (Coordenacao de Aperfeicoamento de Pessoal de Ensino Superior) through a student fellowship to C.S.S. Moraes
文摘The rational design of emulsions requires study of the main factors that influence their formation, physicochemical properties and, consequently, stability and performance. The use of vegetable oils in the pharmaceutical and cosmetic industries has recently become attractive. Dipteryx alata Vogel(D. alata) is an oleaginous species native to Brazil. The seeds of this species contain highly unsaturated oil with significant amounts of tocopherols and phytosterols, representing an important source of agents capable of combatting oxidative processes. In this work, a lamellar gel phase emulsion using oil extracted from the seeds of D. alata(baru) was developed. The steps involved in the development of this research were as follows: 1) development of formulations and 2) in vitro assays by simulating the evaporation of the final product after application to the skin and Electron paramagnetic resonance spectroscopy(EPR) of fatty acid spin labels was used to investigate the profile of interaction of the dispersed systems with stratum corneum(SC) lipids. The results indicate that the developed system shows no signs of instability during the storage period. Moreover, EPR studies indicated that D. alata oil and especially the developed formulation were able to increase SC lipid fluidity and extract a fatty-acid spin label from the lipid domain structures of SC, demonstrating its potential to act as a drug or skin care vehicle.
文摘目的使用传统指标和FT-IR技术评价乳剂稳定性。方法通过两步乳化法制备O/W乳剂,以平均粒径、离心稳定常数及表面张力3个指标对乳剂进行表征。用浸渍法分别测定水相、油相和乳剂的傅里叶变换红外光谱(FT-IR)图,再用软件origin 7.5对水相和乳剂的羟基峰进行去卷积,根据最小二乘法拟合出组成羟基峰的高斯曲线。结果 2个乳剂的平均粒径分别为155.9 nm和138.5 nm,离心稳定常数分别为0.377和0.561,表面张力分别为54.22 m N/m和64.80 m N/m;制成乳剂后,FT-IR图中油相的信号峰几乎完全消失,而水相和乳剂的FT-IR图中,羟基峰均由6条高斯曲线组成,乳剂中5条高斯曲线的峰位对比于水相都发生了蓝移。结论定量的传统指标和定性的FT-IR技术相结合,可以更好地评价乳剂的稳定性。
