山竹果壳提取液中金纳米粒子的生物合成及光谱性质研究

Study on biosynthesis and spectral property of gold nanoparticles in the extracts of mangosteen( garcinia mangostana L) pericarp

在山竹果壳提取液中，以山竹多酚既作还原剂又作保护剂，制备了具有高度稳定性、单分散性的亲水性金纳米粒子。利用紫外可见分光光度法、透射电子显微镜和X射线衍射等手段对制备的金纳米粒子进行了表征和分析。结果表明：金纳米粒子的尺寸大小在9-23nm范围，升高温度其还原反应速率加快，所得金纳米粒子的尺寸减小、单分散性提高。山竹多酚保护金的金纳米颗粒具有pH值调控的分散可逆性。降低山竹提取液的浓度可得到包括单晶纳米片在内的多形态金纳米颗粒。

The mangosteen polyphone-protected gold nanoparticles are fabricated by the extracts of mangosteen pericarp reducing HAuCl4 . The as-prepared gold particles are characterized and analyzed by UV-vis,TEM and XRD. The results shows that the rise of the temperature makes the reaction speed up,reduces the size of the particles,and increases the monodispersion of particles. The mangosteen polyphone-capped gold particles possess the obvious feature of the reversible change between aggregation and dispersity in the aqueous solution through adjusting pH value. The decrease of the concentration of mangosteen extract is helpful to the forma-tion of gold nanoparticles with various morphologies including the single crystal gold nanoflake.