Zahra Masoudian, Seyed Yahya Salehi Lisar, Akbar Norastehnia,
Volume 9, Issue 3 (Winter 2019)
Abstract
Anionic surfactants are widely used in many fields of technology and research due to their favorable properties and are considered as one of the most important factors in contamination of water resources. The presence of high concentrations of these compounds in aquatic environments induces oxidative stress and physiological changes in aquatic animals and threatens their life. In this study, the effects of 7 days exposure to concentrations of 0, 10, 20, 30 and 40 mg/l of linear alkylbenzene sulfanate surfactant was studied on lipid peroxidation, the activity of catalase enzyme, total carotenoid phenolic content, free proline, total chlorophyll content and membrane stability index in Lemna minor plant. The results showed that with increasing LAS concentration, the total chlorophyll content and carotenoid were reduced. The highest total phenol and free proline were observed in concentrations of 40 and 20 mg/l surfactant, respectively. Also, by increasing the concentration of surfactant, the activity of the enzyme catalase and lipid peroxidation increased and the minimum "membrane stability index" was observed in treated plants with a concentration of 40 mg/l of LAS. Concentrations of more than 20 mg/l of LAS caused significant toxicity in the plant Lemna minor.
Zahra Eftekhari, Nahid Sharifi, Akbar Norastehnia, Zahra Masoudian,
Volume 10, Issue 3 (Winter 2020)
Abstract
Azo group dyes are the most important group of commercial dyes and the widest dyes which are used in various industries. The release of effluents containing these compounds into the environment leads to several problems such as reduced photosynthesis and plant growth, and reduced water quality. In the present study, the effect of three different concentrations (0, 10, 20 mg / L) of Acidic Blue dye 92 (AB92) on the physiological characteristics of aquatic plant Ceratophyllum demersum such as photosynthetic pigments, cyanidin glycoside concentration, the ability to scavenging free radicals and lipid peroxidation were investigated during 7 days. According to results, the amount of chlorophyll a, chlorophyll b, total chlorophyll, and total carotenoid decreased in the concentration of 20 mg / L compared to the control by 15.38, 18, 16.88, and 45.1%, respectively. The concentration of cyanidin glycoside, lipid peroxidation, and antioxidant activity increased in both 10 and 20 mg / L, since at 20 mg / L concentration so that these parameters were increased in comparison with control by 81.8%, 69.5 %, and 14.29 %, respectively. Thus, the presence of both 10 and 20 mg / L of Acidic Blue dye 92 induced antioxidant activity and the risk of oxidative stress for Ceratophyllum demersum.
