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. 2018 Jun 26;8:9683. doi: 10.1038/s41598-018-26891-7

Figure 11.

Figure 11

Co K-edge X-ray absorption near edge spectra (XANES) for (A–H) Glochidion cf. sericeum leaf tissue 17 (green trace drawn repeatedly) compared against (red traces) 5 mM Co(II) model spectra; (A) 1:10 Co:tartrate in buffered pH 5.5 aqueous solution; (B) 1:10 Co:tartrate in unbuffered aqueous solution; (C) 1:10 Co:malonate in buffered pH 5.5 aqueous solution; (D) 1:10 Co:citrate in buffered pH 5.5 aqueous solution; (E) 1:1 Co:citrate in buffered pH 5.5 aqueous solution; (F) 1:1 Co:citrate in unbuffered pH 2.4 aqueous solution; (G) aqueous Co(II) at pH 4.4; (H) 1:10 Co:glutathione in buffered pH 7.5 aqueous solution (black trace), 1:10 Co:histidine in buffered pH 7.5 aqueous solution (green trace), 1:10 Co:cysteine in buffered pH 5.5 aqueous solution (red trace).