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Title: Biosorption performance of encapsulated Candida Krusei for the removal of copper( iI)
Authors: Luk, CHJ 
Yip, J 
Yuen, CWM 
Pang, SK 
Lam, KH 
Kan, CW 
Issue Date: 2017
Source: Scientific reports, 19 2017, v. 7, no. , 2159, p. 1-9
Abstract: The use of microorganisms in biosorption is one of the most promising ways to remove trace amounts of heavy metal ions. Nevertheless, the enhancement of the successful removal of heavy metal ions by using different combinations of biosorbents is not generally guaranteed which leaves room to explore the application of the technique. In this study, the performance of free and immobilized forms of a yeast strain, Candida krusei (C. krusei), and calcium alginate (CaAlg) are evaluated for their ability to remove copper(II). Infrared spectroscopy, studies on the effects of pH and temperature, and kinetics and isotherm modelling are carried out to evaluate the biosorption. The infrared spectroscopy shows that the primary biosorption sites on the biosorbents are carboxylate groups. In addition, a higher pH and higher temperatures promote biosorption while a decline in biosorption ability is observed for C. krusei at 50 degrees C. The kinetics study shows that C. krusei, CaAlg and immobilized C. krusei (MCaAlg) conform with good correlation to pseudo- second order kinetics. MCaAlg and CaAlg fit well to the Langmuir isotherm while C. krusei fits well to the Temkin isotherm. From the experimental data, encapsulating C. krusei showed improved biosoprtion and address clogging in practical applications.
Publisher: Nature Publishing Group
Journal: Scientific reports 
ISSN: 2045-2322
DOI: 10.1038/s41598-017-02350-7
Rights: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
© The Author(s) 2017
The following publication Luk, C.H.J., Yip, J., Yuen, C.W.M. et al. Biosorption Performance of Encapsulated Candida krusei for the removal of Copper(II). Sci Rep 7, 2159 (2017) is available at
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