Open AccessMineralization induced by phosphorylated dry baker’s yeast
Author(s) -
Yoshihiro Ojima,
Maya Kihara,
Mami Yoshida,
Koichi Igarashi,
Tomoko Yoshida,
Masayuki Azuma
Publication year - 2020
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0239774
Subject(s) - mineralization (soil science) , yeast , phosphorylation , chemistry , biology , biochemistry , ecology , soil water
We found the mineralization of Cu during long-term Cu2+ adsorption onto dry baker’s yeast cells phosphorylated using sodium cyclo-triphosphate. Field emission scanning electron microscopy (FESEM) with energy-dispersive X-ray spectroscopy confirmed that the elemental composition of minerals were copper, phosphorus, and oxygen. Synchrotron-based X-ray absorption fine structure showed that the local structure around Cu atoms deposited on the mineral was almost identical to that of commercial copper (II) phosphate Cu 3 (PO 4 ) 2 ∙3H 2 O. However, the crystallinity was low, and the structure was slightly distorted. Time profile analysis using FESEM revealed that copper phosphate mineralization was first apparent on Day 3 of adsorption, whereas mineral formation plateaued at around Day 7. It seems that mineralization occurs by the local saturation of phosphate and Cu 2+ on the yeast cells. Mineralization of the rare earth ion Dy 3+ was also demonstrated during long-term adsorption. Mineralization on phosphorylated yeast cells appears to follow a common path for various types of metal ions and provides a promising technique for metal recovery via irreversible adsorption.