50种常用香料对铜绿微囊藻的生态毒性效应

为探究香料对铜绿微囊藻生长的影响,以常用的50种典型香料为供试目标物,测定不同暴露浓度下对藻生长的影响,并选择了对藻的生长有显著抑制作用的4种香料2-甲氧基萘?麝香草酚?月桂烯和吲哚测定不同暴露浓度下对藻的叶绿素a、可溶性蛋白含量、抗氧化酶活性(超氧化物歧化酶SOD、过氧化氢酶CAT、过氧化物酶POD)以及丙二醛(MD...

Ecotoxicological effects of 50 kinds of fragrance materials on Microcystis aeruginosa

In the present study, the 50 fragrance materials were performed to determine the ecological toxicity on Microcystis aeruginosa. The influence of four fragrance materials (2-methoxynaphthalene, thymol, myrcene and indole) on the content of chlorophyll a and soluble protein, superoxide dismutase (SOD) activity, catalase (CAT) activity and malondialdehyde (MDA) content were also studied. The results showed that 2-methoxynaphthalene, thymol, myrcene and indole can significantly inhibit the growth of Microcystis aeruginosa under high concentration exposure, and the half-effect concentration E_yC₅₀ value was 1.81, 1.26, 0.55 and 1.40mg/L, respectively, showing an obvious dose-effect relationship. At a treatment concentration of 1mg/L, 2-methoxynaphthalene and thymol significantly inhibited the content of chlorophyll a and soluble protein (P<0.0001). Exposure to 2-methoxynaphthalene resulted in a significant decrease in SOD activity (P<0.0001), the other two antioxidant enzymes had no significant effect (P>0.05); Thymol significantly inhibited POD activity (P<0.0001), and myrcene also reduced SOD activity (P<0.01). The activities of POD and CAT of Microcystis aeruginosa treated with indole were significantly lower than those of the control group (P<0.0001). Studies showed that these four fragrance materials inhibited the antioxidant enzyme activity, accumulate excessive MDA, and destroied the content and function of chlorophyll, which in turn leads to the abnormal growth of algae. 2-methoxynaphthalene, thymol and indole are aromatic compounds, and myrcene was an olefin. The difference in structure of the four fragrance compounds resulted to the different effects on antioxidant enzymes. 2-Methoxynaphthalene was a synthetic fragrance. Although thymol, myrcene and indole were all natural flavors, they were mostly prepared by artificial synthesis. The current findings will enrich the fundamental data for evaluating the risk and toxicity of fragrance materials on the ecosystems. Because of their unique aromatic odor, aromatic compounds have become a large category of fragrance materials and are widely used. However, the aromatic ring is stable and difficult to degrade, so we need to pay more attention to the ecological safety of the fragrance materials with aromatic ring structure.