In previous studies, it was indicated that the use of a strong reductant such as borohydride

promotes the formation of silver nanoparticles in the solution, which have a narrow size distribution. However, the severe deficiency confronted during the preparation of nanoparticles is the stability of the solution and the aggregation of nanoparticles [6–9]. In order to solve this problem, various methods are developed by researchers, such as the addition of surfactants (polyvinyl pyrrolidone selleck screening library and polyethylene glycol), spray pyrolysis, low plasma, and so on [5, 10, 11]. Nevertheless, the check details synthesis of a monodisperse and stable silver nanoparticle suspension is challenging and may go through tedious and complex procedures, which

may hinder the practical applications of silver nanoparticles on textiles. In this paper, we developed a method to synthesize a multi-amino compound (RSD-NH2) using methacrylate and polyethylene polyamine as a precursor with the presence of methanol [12]. The schematic description of the RSD-NH2′s molecular structure can be seen in Figure  1. We can see that a lot of amino and imino groups are on the surface of RSD-NH2, which can reduce silver ions to atoms and subsequently grow to silver nanoparticles [13]. The size distribution of particles and the properties of the solution are characterized. Furthermore, an in situ formation of silver nanoparticles on the silk fabrics is carried Lorlatinib manufacturer out to avoid the aggregation of particles in the solution [14]. ifoxetine The antibacterial property of silk fabrics was studied, particularly washed after different times. Figure 1 Schematic description of the RSD-NH 2 ‘s molecular structure. Methods Materials The mass

of mulberry silk fabric is 60 g/m2 (purchased from Xinchang Co. Ltd, Guangzhou, China). Methacrylate, polyethylene polyamine, methanol, sodium sulfide (Na2S), silver nitrate (AgNO3), and nitric acid (HNO3) in analytical grade were purchased from Sinopharm Chemical Reagent Co. Ltd. (Beijing, China). The multi-amino compound (RSD-NH2) was prepared in the laboratory. Nutrient broth and nutrient agar, which are both biochemical reagents to culture bacteria, were purchased from Scas Ecoscience Technology Inc. (Shanghai, China). Staphylococcus aureus (ATCC 6538) and Escherichia coli (ATCC 8099) were obtained from the College of Life Science, Soochow University (China). Synthesis of the multi-amino compound (RSD-NH2) Polyethylene polyamine (1 M, 104 ml) was added in a 250-ml three-neck round-bottomed glass flask equipped with a constant-voltage dropping funnel, a thermometer, and a nitrogen inlet tube. The solution was stirred with a magnetic agitator. The flask was cooled to 24°C using a circulating water bath. Simultaneously, the mixture of methacrylate (1 M, 86 ml) in methanol was dropped slowly into the flask through the funnel.