is a medicinally important plant that has abundant phytochemicals with high antioxidant and metal-chelating potential. The extract of the leaves and seeds have the potential to synthesize metal nanoparticles; however, the rate of silver nanoparticles synthesis is significantly low in case of the seeds. The objective of this study was to enhance the rate of synthesis of silver nanoparticles by photocatalysis. The extraction and characterization of the aqueous extract of the seed was followed by optimization of the silver nanoparticles synthesis. The GCMS analysis of the aqueous extract identified the presence of carbohydrates, amino acids, lipids and secondary metabolites. Photocatalytic synthesis of silver nanoparticles in the dark and under 250, 825 and 2000 lumens of white LED light at a constant temperature yielded approximately 0.1%, 3%, 4% and 5.5% nanoparticles, respectively. Likewise, the mean diameters of the nanoparticles in the dark and under 2000 lumens were approximately 21 and 52 nm respectively. The light intensity influenced the elemental composition of the nanoparticles, wherein the percentage silver with 250 and 2000 lumens was approximately 16% and 20%, respectively. However, the silver nanoparticles synthesized by the aqueous extract had limited stability. Nanoparticles synthesized under 2000 lumens decomposed in less than 72 h, whereas nanoparticles synthesized in 250 and 825 lumens were significantly stable for three days. However, the nanoparticles synthesized in the dark demonstrated the highest stability of seven days. Therefore, the aqueous extract in combination with photocatalytic activity of white LED light, significantly enhanced the silver nanoparticles yield, but with limited stability.

中文翻译：

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白光 LED 光催化增强胡芦巴种子水提取物绿色合成银纳米粒子

是一种重要的药用植物，含有丰富的植物化学物质，具有高抗氧化和金属螯合潜力。叶子和种子的提取物具有合成金属纳米颗粒的潜力；然而，对于种子而言，银纳米粒子的合成率明显较低。本研究的目的是提高光催化合成银纳米粒子的速率。种子水提取物的提取和表征之后是银纳米颗粒合成的优化。水提取物的 GCMS 分析鉴定出碳水化合物、氨基酸、脂质和次级代谢物的存在。在黑暗、250、825 和 2000 流明白光 LED 光下、在恒温下光催化合成银纳米颗粒分别产生约 0.1%、3%、4% 和 5.5% 的纳米颗粒。同样，纳米颗粒在黑暗中和2000流明下的平均直径分别约为21和52 nm。光强度影响纳米颗粒的元素组成，其中250和2000流明的银百分比分别约为16%和20%。然而，由水提取物合成的银纳米粒子稳定性有限。在 2000 流明下合成的纳米颗粒在不到 72 小时内分解，而在 250 和 825 流明下合成的纳米颗粒在三天内显着稳定。然而，在黑暗中合成的纳米颗粒表现出 7 天的最高稳定性。因此，水提取物与白光LED光的光催化活性相结合，显着提高了银纳米颗粒的产率，但稳定性有限。