Next Article in Journal
Effect of Heat Treatment on the Properties of Wood-Derived Biocarbon Structures
Previous Article in Journal
A Lattice Model for Elastic Particulate Composites
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Materials 2018, 11(9), 1587; https://doi.org/10.3390/ma11091587

The Golden Activity of Lysinibacillus sphaericus: New Insights on Gold Accumulation and Possible Nanoparticles Biosynthesis

1
Microbiological Research Center (CIMIC), Department of Biological Sciences, Universidad de los Andes, Bogotá 111711, Colombia
2
Microscopy Center, Universidad de los Andes, Bogotá 111711, Colombia
*
Author to whom correspondence should be addressed.
Received: 4 July 2018 / Revised: 20 July 2018 / Accepted: 23 July 2018 / Published: 2 September 2018
Full-Text   |   PDF [9706 KB, uploaded 2 September 2018]   |  

Abstract

Power struggles surrounding the increasing economic development of gold mining give rise to severe environmental and social problems. Two new strains of Lysinibacillus sphaericus were isolated from an area of active alluvial gold mining exploitation at El Bagre, Antioquia. The absorption capacity of these strains and some of the L. sphaericus Microbiological Research Center (CIMIC) collection (CBAM5, OT4b.31, III(3)7) were evaluated by spectrophotometry according to a calibration gold curve of HAuCl4 with concentrations between 0 µg/mL and 100 µg/mL. Bioassays with living biomass were carried out with an initial gold concentration of 60 µg/mL. Their sorption capacity was evident, reaching percentages of gold removal between 25% and 85% in the first 2 h and 75% to 95% after 48 h. Biosynthesis of possible gold nanoparticles (AuNPs) in assays with living biomass was also observed. Metal sorption was evaluated using scanning electron microscopy and energy-dispersive X-ray spectroscopy (EDS) analysis. The sorption and fabrication capacity exhibited by the evaluated strains of L. sphaericus converts this microorganism into a potential alternative for biomining processes, especially those related to gold extraction. View Full-Text
Keywords: mining; gold; Lysinibacillus sphaericus; sorption; nanoparticles; SEM mining; gold; Lysinibacillus sphaericus; sorption; nanoparticles; SEM
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material

SciFeed

Share & Cite This Article

MDPI and ACS Style

Bustos, M.C.; Ibarra, H.; Dussán, J. The Golden Activity of Lysinibacillus sphaericus: New Insights on Gold Accumulation and Possible Nanoparticles Biosynthesis. Materials 2018, 11, 1587.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top