Binding of cadmium to Strychnos potatorum seed proteins in aqueous solution: adsorption kinetics and relevance to water purification

Colloids and Surfaces. B, Biointerfaces
Mohammad Mansour Saleh SaifM N V Prasad

Abstract

Strychnos potatorum seeds (cleaning nuts or nirmali) are extensively used by remote village tribals in the state of Andhra Pradesh, India for clarification of turbid and metal contaminated water. In the present study the ability of seed proteins to bind aqueous cadmium has been investigated. Biochemical characterization of the seed powder revealed the presence of coagulant proteins. These proteins were isolated from the soluble extracts of the seeds by ammonium sulfate fractionation. The (30-70%) fraction containing the bulk of proteins were separated by gel filtration into two peaks A and B. The (30-70%) ammonium sulfate precipitated proteins, as well as those from Peak A and B were separately immobilized to affigel-10. The Cd(II) biosorption efficiency by these proteins have been investigated. Different experiments have been conducted (i) over a range of pH (2.0-7.0), (ii) contact time (5-600 min), (iii) temperatures (4-40°C) and (iv) metal ion concentrations (80-110 mg L(-1)). The results showed that the optimum conditions for Cd(II) adsorption are almost same for the three proteins used in the study. Cd(II) removal is pH dependent and the maximum removal was at pH 5.0 in a time span of 360 min. The equilibrium data fit into...Continue Reading

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Citations

Nov 21, 2015·Saudi Journal of Biological Sciences·Ali A Al-HomaidanAljawharah F Alabbad
Oct 11, 2015·Environmental Monitoring and Assessment·Mahmoud TaghaviBehrouz Akbari-Adergani
Sep 14, 2013·IET Nanobiotechnology·Aruna Jyothi Kora, Jayaraman Arunachalam
Sep 27, 2016·Journal of Agricultural and Food Chemistry·Xianhong DaiPeiwu Li
Sep 16, 2018·Environmental Monitoring and Assessment·S VishaliK Ashish Anand

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