This paper aims to evaluate the effects of a product containing colloidal silver in the aquatic environment, using duckweed Lemna gibba as a model plant. Therefore, growth parameters, photosynthetic pigments content and protein content as physiological indices were evaluated. Changes in the content of non-enzymatic antioxidants and activity of several antioxidant enzymes, alongside with the accumulation of hydrogen peroxide and lipid peroxidation end-products were assessed to explore the potential of colloidal silver to induce oxidative stress. The commercially available colloidal silver product contained a primary soluble form of silver. The treatment with colloidal silver resulted in significant physiological and biochemical changes in L. gibba plants and a consequent reduction of growth. Accumulation of silver caused altered nutrient balance in the plants as well as a significant decrease in photosynthetic pigments content and protein concentration. The antioxidative response of L. gibba plants to treatment with colloidal silver was inadequate to protect the plants from oxidative stress caused by metal accumulation. Silver caused concentration-dependent and time-dependent hydrogen peroxide accumulation as well as the elevation of lipid peroxidation levels in L. gibba plants. The use of commercially available products containing colloidal silver, and consequent accumulation of silver, both ionic and nanoparticle form in the environment, represents a potential source of toxicity to primary producers in the aquatic ecosystem.

本文旨在以浮萍Lemna gibba为模型植物，评估含有胶体银的产品在水生环境中的效果。因此，评价了生长参数，光合色素含量和蛋白质含量作为生理指标。评估了非酶类抗氧化剂含量的变化和几种抗氧化剂酶的活性，以及​​过氧化氢和脂质过氧化终产物的积累，以探索胶体银诱导氧化应激的潜力。市售的胶体银产品包含银的主要可溶形式。胶体银处理导致吉氏乳杆菌发生明显的生理和生化变化植物并因此减少了生长。银的积累导致植物营养平衡的改变，以及光合色素含量和蛋白质浓度的显着下降。吉氏乳杆菌植物对胶体银处理的抗氧化反应不足以保护植物免受金属积累引起的氧化胁迫。银导致了L. gibba植物中浓度依赖性和时间依赖性的过氧化氢积累以及脂质过氧化水平的升高。使用包含胶体银的市售产品以及随之而来的离子和纳米颗粒形式的银在环境中的积累，代表了对水生生态系统初级生产者的潜在毒性来源。