Response of Pseudokirchneriella subcapitata in Free and Alginate Immobilized Cells to Heavy Metals Toxicity.

Autor: Al-Hasawi ZM; Biological Sciences Department, Faculty of Science, King Abdulaziz University, P.O. 80203, Jeddah 21589, Saudi Arabia., Abdel-Hamid MI; Botany Department, Faculty of Science, University of Mansoura, Mansoura 35516, Egypt., Almutairi AW; Biological Sciences Department, Rabigh-Faculty of Science & Arts, King Abdulaziz University, P. O. box 344, Rabigh 21911, Saudi Arabia., Touliabah HE; Biological Sciences Department, Rabigh-Faculty of Science & Arts, King Abdulaziz University, P. O. box 344, Rabigh 21911, Saudi Arabia.; Permanent address: Botany Department, Faculty of Girls for Sciences, Education and arts, Ain Shams University, Cairo 11757, Egypt.
Jazyk: angličtina
Zdroj: Molecules (Basel, Switzerland) [Molecules] 2020 Jun 19; Vol. 25 (12). Date of Electronic Publication: 2020 Jun 19.
DOI: 10.3390/molecules25122847
Abstrakt: Effects of 12 heavy metals on growth of free and alginate-immobilized cells of the alga Pseudokirchneriella subcapitata were investigated. The tested metals ions include Al, As, Cd, Co, Cr, Cu, Hg, Se, Ni, Pb, Sr, and Zn. Toxicity values (EC 50 ) were calculated by graphical interpolation from dose-response curves. The highest to the lowest toxic metals are in the order Cd > Co > Hg > Cu > Ni > Zn > Cr > Al > Se > As > Pb > Sr. The lowest metal concentration (mg L - 1 ) inhibiting 50% (EC 50 ) of algal growth of free and immobilized (values in parentheses) algal cells were, 0.018 (0.09) for Cd, 0.03 (0.06) for Co, 0.039 (0.06) for Hg, 0.048 (0.050) for Cu, 0.055 (0.3) for Ni, 0.08 (0.1) for Zn, 0.2 (0.3) for Cr, 0.75 (1.8) for Al, 1.2 (1.4) for Se, 3.0 (4.0) for As, 3.3 (5.0) for Pb, and 160 (180) for Sr. Free and immobilized cultures showed similar responses to Cu and Se. The free cells were more sensitive than the immobilized ones. Accordingly, the toxicity (EC 50 ) of heavy metals derived only form immobilized algal cells might by questionable. The study suggests that batteries of alginate-immobilized algae can efficiently replace free algae for the bio-removal of heavy metals.
Competing Interests: The authors declare no conflict of interest.
Databáze: MEDLINE
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