Publication Date:
2019
Description:
〈p〉Publication date: January 2020〈/p〉
〈p〉〈b〉Source:〈/b〉 Chemosphere, Volume 238〈/p〉
〈p〉Author(s): Mohammad Behzadi Tayemeh, Milad Esmailbeigi, Iman Shirdel, Hamid Salari Joo, Seyed Ali Johari, Ashkan Banan, Hossein Nourani, Hamed Mashhadi, Mohammad Javad Jami, Mona Tabarrok〈/p〉
〈div xml:lang="en"〉
〈h5〉Abstract〈/h5〉
〈div〉〈p〉This study assesses and compares the influence of silver nanoparticles (AgNPs) and silver nitrate (AgNO〈sub〉3〈/sub〉) on the fatty acid composition, pigments, and growth indices of 〈em〉Chlorella vulgaris〈/em〉. Toxicity testing was carried at the estimated and/or above predicted environmental concentrations of AgNPs and AgNO〈sub〉3〈/sub〉. AgNO〈sub〉3〈/sub〉 treatments impaired the population growth of 〈em〉C〈/em〉. 〈em〉vulgaris〈/em〉 about 2–183 times more than the respective AgNPs ones. The pigments displayed a concentration-dependent decrease in response to both forms of silver; however, AgNO〈sub〉3〈/sub〉 displayed higher severity to the pigments than AgNPs. In exposure to 10 μg L〈sup〉−1〈/sup〉 AgNO〈sub〉3〈/sub〉, the contents of chlorophyll 〈em〉a〈/em〉, chlorophyll 〈em〉b〈/em〉, total chlorophyll, and carotenoid, respectively, demonstrated a reduction of about 5, 3, 4, and 4 times when compared with the same respective concentration of AgNPs. Total amounts of saturated (∑SFA), monounsaturated (∑MUFA), and polyunsaturated (∑PUFA) fatty acids as well as the ratio of unsaturated to saturated ones (Unsat./Sat.) displayed somewhat similar-concentration responses. ∑SFA exhibited a hormesis response, and ∑MUFA, ∑PUFA, and Unsat./Sat. did a decreasing trend with increasing concentration of AgNPs and AgNO〈sub〉3〈/sub〉. Myristoleic acid, nervonic acid, and eicosadienoic acid revealed the highest sensitivity. Pearson analysis illustrated the highest correlation among myristoleic acid, eicosenoic acid, and nervonic acid as well as among palmitic acid, stearic acid, palmitoleic acid, and oleic acid. Taken together, AgNPs and the released ions could disrupt physiological health state of microalgae through perturbation in the fatty acid composition (especially MUFAs and PUFAs) and other macromolecules. These types of bioperturbations could change the good health state of aquatic ecosystems.〈/p〉〈/div〉
〈/div〉
〈h5〉Graphical abstract〈/h5〉
〈div〉〈p〉〈figure〉〈img src="https://ars.els-cdn.com/content/image/1-s2.0-S0045653519318004-fx1.jpg" width="246" alt="Image 1" title="Image 1"〉〈/figure〉〈/p〉〈/div〉
Print ISSN:
0045-6535
Electronic ISSN:
1879-1298
Topics:
Energy, Environment Protection, Nuclear Power Engineering
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