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Advances in Nano Research
  Volume 3, Number 4, December 2015, pages 243-255
DOI: http://dx.doi.org/10.12989/anr.2016.3.4.243
 

Toxicity evaluation based on particle size, contact angle and zeta potential of SiO2 and Al2O3 on the growth of green algae
Gopalu Karunakaran, Rangaraj Suriyaprabha, Venkatachalam Rajendran and Narayanasamy Kannan

 
Abstract     [Full Text]
    In this investigation, ecotoxicity of nano and micro metal oxides, namely silica (SiO2) and alumina (Al2O3), on the growth of green algae (Porphyridium aerugineum Geitler) is discussed. Effects of nano and micro particles on the growth, chlorophyll content and protein content of algae are analysed using standard protocols. Results indicate that SiO2 nano and micro SiO2 particles are non-toxic to P. aerugineum Geitler up to a concentration of 1000 mg/L. In addition, Al2O3 microparticles are less toxic to P. aerugineum Geitler, whereas Al2O3 nanoparticles are found to be highly toxic at 1000 mg/L. Moreover, Al2O3 nanoparticles decrease the growth, chlorophyll content, and protein content of tested algae. In addition, zeta potential and contact angle are also important in enhancing the toxicity of metal oxide nanoparticles in aquatic environment. This study highlights a new insight into toxicity evaluation of nanoparticles on beneficial aquatic organisms such as algae.
 
Key Words
    nano metal oxides; Porphyridium aerugineum Geitler; chlorophyll content; zeta potential; contact angle; protein content
 
Address
Gopalu Karunakaran: Centre for Nanoscience and Technology, K. S. Rangasamy College of Technology, Tiruchengode-637215, Tamil Nadu, India; Department of Biotechnology, K. S. Rangasamy College of Arts and Science, Tiruchengode-637215, Tamil Nadu, India; Department of Functional Nanosystems and High-Temperature Materials, National University of Science and Technology \"MISiS\", Leninskiy Pr. 4, Moscow, 119049, Russia
Rangaraj Suriyaprabha, Venkatachalam Rajendran: Centre for Nanoscience and Technology, K. S. Rangasamy College of Technology, Tiruchengode-637215, Tamil Nadu, India
Narayanasamy Kannan: Department of Biotechnology, K. S. Rangasamy College of Arts and Science, Tiruchengode-637215, Tamil Nadu, India
 

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