Jianping Xiea
, Jim Yang Lee* a,c, Daniel I.C. Wanga,b and Yen Peng Tingc
a Singapore-MIT Alliance, 4 Engineering Drive 3, National University of Singapore, Singapore 117576.
b Department of Chemical Engineering, M.I.T., 77 Massachusetts Ave., Cambridge, MA 02139, USA.
c Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent
Ridge Crescent, Singapore 119260.
Figure S1. A) UV-vis spectrum of the algal extract. The strong absorption in the UV region at ca. 278
nm is characteristic of the aromatic side groups in the amino acid residues (tyrosine, tryptophan and
phenylalanine) of proteins. B) Ag-stained SDS-PAGE showing the proteins in the raw algal extract.
Lane 1 shows standard protein molecular weight markers with molecular weights in kiloDaltons. Lane 2
shows the proteins in the algal extract and their approximate molecular weights.
Figure S2. UV-vis spectra of Ag nanocrystals obtained by using L-Tyr (spectrum a) and O-Methyl-L?Tyr (spectrum b). The pH of both reaction solutions was adjusted to 9.0. Both samples were collected at
t=8 h into the reaction.
Figure S3. Representative FESEM images (A-E) and UV-vis spectra (F) of Ag nanocrystals obtained
by reacting aqueous AgNO3 solution with different custom-designed peptides: A) GGY; B) SSY; C)
KKY; D) GDY and E) poly (Glu, Tyr). The pH of reaction was adjusted to 9.0. All samples were
collected at t=8 h into the reaction.
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