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. Author manuscript; available in PMC: 2014 Feb 14.
Published in final edited form as: J Phys Chem B. 2013 Feb 4;117(6):1790–1809. doi: 10.1021/jp3097378

Table 3.

Fluorescence Quantum Yields and Emission Maxima of Hairpin Peptides at pH 6.5. a

Substitutions Temp / K Yield b λmax / nm c
none 295 0.25 ± 0.02 343
Ala8ε-N-AcK d 295 0.25 ± 0.01 341
Ala8Asn 295 0.28 ± 0.03 344
Ala8Asp 295 0.27 ± 0.01 344
Ala8Lys 295 0.24 ± 0.01 343
Ala8Cha d 295 0.27 ± 0.01 340
Ala8Gln 295 0.23 ± 0.02 343
Ala8Glu 295 0.25 ± 0.03 343
Ala8Ser 295 0.22 ± 0.01 344
Ala8Cys 295 0.036 ± 0.001 347
Ala8Orn d 295 0.113 ± 0.005 345
Ala8Tyr 295 0.134 ± 0.003 343
Ala8His 295 0.17 ± 0.01 344
Phe10Tyr 295 0.166 ± 0.008 344
Phe10His 285 0.135 ± 0.004 347
Phe10Leu 285 0.24 ± 0.03 345
Trp1Phe / Phe10Trp 285 0.068 ± 0.005 345
a

The peptides are Ac-WVTIpGKAIFTG-NH2 with the indicated substitutions for residues in bold font. Except where indicated in the last row, all the peptides had Trp at position 1.

b

Fluorescence quantum yield (mean and standard deviation of three measurements).

c

Emission peak ± 1 nm.

d

Abbreviations: Ack = ε-N-Acetyl-lysine, Cha = cyclohexylalanine, Orn = ornithine.