短链葡聚糖-姜黄素纳米乳液的制备及结构表征

利用短链葡聚糖(short glucan chains,SGC)的螺旋空间结构来包埋姜黄素(curcumin,CUR)。通过使用高剪切分散乳化机高速剪切溶液5 min,用纳米均质机在50 MPa压力下高压均质经剪切后的乳液2次制备成纳米乳液以提高其包埋率和载药量。XRD (x-ray diffraction)和TGA (thermogravimetric analysis)很好的验证了包合物的形成,通过TGA、SEM (scanning electron microscopy)、激光粒径分析仪等各种表征分析得出短链葡聚糖-姜黄素纳米乳液制备成功,所制得的乳液对姜黄素的包埋率和载药量都高于短链葡聚糖-姜黄素包合物,分别达到了71.11%和12.07%,说明制备成纳米乳液对姜黄素的包埋率和载药量都有了明显的提高。所制备的纳米乳液的粒径小于300 nm,粒径分布均一,Zeta电位观测表明所制得的乳液的稳定性有所提高。为提高食品及医药领域姜黄素的生物利用率提供了一定的参考意义。

Preparation and structure characterization of short glucan chain-curcumin nano-emulsion

Abstract: In order to solve the problem of curcumin''s low biological value in food and drug, the helical space structure of the short glucan chains with a short DP (degree of polymerization) was induced to embed the water insolubility curcumin and to enhance its biological value. This article introduced a way how to make short glucan chains and use short glucan chains to encapsulate with curcumin to make inclusion complexes and nano-emulsions. Short glucan chains were obtained by pullanase''s enzymatic hydrolysis, which came out successfully by the verification of XRD (X-ray diffraction) results. The inclusion complexes were made by mixing, but its poor encapsulation efficiency and loading content were about 28.46% and 1.27%, separately. Short glucan chain-curcumin nano-emulsions were produced by emulsification and shearing to improve the embedding rate and drug loading, using the Hi-shear dispersing emulsifier with D-speed shearing solution for 5 min to get SGC-CUR nano-emulsion, and the nano-homogenizer was used to homogenize the sheared emulsion twice under a pressure of 50 MPa to prepare the emulsion. High embedding rate and drug loading were produced by making curcumin-short glucan chain into nano-emulsions, and we got a good result of embedding rate and drug loading: 71.11% and 12.07%, respectively. Popular methods as SEM (scanning electron microscopy), TGA (thermogravimetric analysis), Zeta etc. were measured to analysis stability, water solubility and structure characterization. Curcumin''s solubility was not only increased by adding emulsifier but also by interaction behaviors between short glucan chains and curcumin, which stop crystal''s growing and kept amorphous state to enhance its solubility. From SEM we knew that the short glucan chain-curcumin had rough surface because of the enzymatic hydrolysis, partially cracked and stuck together, this phenomenon was almost the same with former studies that starch nanoparticles were adhered. As for nano-emulsions'' Zeta potential were below 20 mV which means it has a low stability and has a room to improve, this result was same with the picture showed at the 7th day that the emulsion slowly began to stratify. The nano-emulsion particle size changed from 238.33 to 170.87 nm when fewer emulsifier were added, probably because of more water/oil interface had produced, which supported the formation of smaller droplets. The PDI (particle size distribution index) of nano-emulsions was all less than 0.3, which means the particle size distribution followed a uniform distribution pattern. The process greatly improved the solubility of curcumin, increased the stability of curcumin, and provided a suitable way for the medical field to find better embedding of curcumin wall materials.