Document Detail

Influence of biomass and gold salt concentration on nanoparticle synthesis by the tropical marine yeast Yarrowia lipolytica NCIM 3589.
MedLine Citation:
PMID:  19700266     Owner:  NLM     Status:  MEDLINE    
Cell-associated gold nanoparticles and nanoplates were produced when varying number of Yarrowia lipolytica cells were incubated with different concentrations of chloroauric acid (HAuCl(4)) at pH 4.5. With 10(9)cells ml(-1) and 0.5 or 1.0 mM of the gold salt, the reaction mixtures developed a purple or golden red colour, respectively, and gold nanoparticles were synthesized. Nanoparticles of varying sizes were produced when 10(10)cells ml(-1) were incubated with 0.5, 1.0 or 2.0 mM chloroauric acid salt. With 3.0, 4.0 or 5.0 mM HAuCl(4), nanoplates were also observed. With 10(11)cells ml(-1) nanoparticles were synthesized with almost all the gold salt concentrations. The cell-associated particles were released outside when nanoparticle-loaded cells were incubated at low temperature (20 degrees C) for 48 h. With increasing salt concentrations and a fixed number of cells, the size of the nanoparticles progressively increased. On the other hand, with increasing cell numbers and a constant gold salt concentration, the size of nanoparticles decreased. These results indicate that by varying the number of cells and the gold salt concentration, a variety of nanoparticles and nanoplates can be synthesized. Fourier transform infrared (FTIR) spectroscopy revealed the possible involvement of carboxyl, hydroxyl and amide groups on the cell surfaces in nanoparticle synthesis.
P S Pimprikar; S S Joshi; A R Kumar; S S Zinjarde; S K Kulkarni
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-08-07
Journal Detail:
Title:  Colloids and surfaces. B, Biointerfaces     Volume:  74     ISSN:  1873-4367     ISO Abbreviation:  Colloids Surf B Biointerfaces     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-09-28     Completed Date:  2009-12-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9315133     Medline TA:  Colloids Surf B Biointerfaces     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  309-16     Citation Subset:  IM    
Institute of Bioinformatics and Biotechnology, University of Pune, Pune 411007, India.
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MeSH Terms
Biofilms / drug effects,  growth & development
Cell Wall / metabolism
Gold / pharmacology*
Nanoparticles / chemistry,  microbiology*
Particle Size
Seawater / microbiology*
Spectrophotometry, Ultraviolet
Spectroscopy, Fourier Transform Infrared
Tropical Climate*
X-Ray Diffraction
Yarrowia / cytology,  metabolism*,  physiology,  ultrastructure
Reg. No./Substance:

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