Preparation and characterization of Sanguisorbae Radix/nano-silver composites / 中草药

ABSTRACT

Objective: To synthesize and characterize Sanguisorbae Radix/nano-silver composites by reduction of silver nitrate solution using Sanguisorbae Radix as reducing agent and dispersant. Methods: Taking the absorbance of UV-visible spectroscopy of Sanguisorbae Radix/nano-silver composites as index to study the influence of different factors, such as extracting time of Sanguisorbae Radix powder, reaction temperature of synthesis, volume of Sanguisorbae Radix extract, and concentration of AgNO3, on the formation of nano-silver composites and to optimize the conditions. TEM, XRD, FT-IR, and DLS could be used to characterize the physicochemical properties of Sanguisorbae Radix/nano-silver composites. Results: The optimum conditions were as follows the boiling time of Sanguisorbae Radix powder was 15 min, the volume ratio of 0.1 g/mL Sanguisorbae Radix extract and 1 mmol/L AgNO3 was 110, the resultant temperature was 25 °C, and the reaction time was 1 h, the Sanguisorbae Radix/nano-silver composites obtained were approximately spherical in shape with the mean size about 21 nm in good uniformity and stability. Conclusion: The preparation of Sanguisorbae Radix/nano-silver composites is stable and feasible.