@article{oai:nitech.repo.nii.ac.jp:00004121,
 author = {Uehara, Toshiyuki and Okabayashi, Hirofumi and Taga, Keijiro and Yoshida, Tadayoshi and Kojima, Hiroshi},
 issue = {23},
 journal = {Journal of the Chemical Society. Faraday transactions.},
 month = {Jan},
 note = {N-Octanoyl-L-glutamic acid oligomers (residue number, N = 3-6, 8, 10, 12, 14, 16, 18, 20 and 22) have been synthesized in order to study their molecular conformations in the solid state. The X-ray diffraction powder patterns and the vibrational spectra of these oligomers have been investigated and compared with those of two β-forms (β1 and β2) and the α-helix of poly(L-glutamic acid). The results are summarized as follows. These oligomers take up a β1- or β2-like structure, similar to that of the two  β-forms of poly(L-glutamic acid). The methods used to precipitate the samples are related to the conformational preferences in the solid state. β1 ? β2 interconversion is possible by reprecipitation of the sample. Preferential stabilization of the β1- or β2-forms is strongly dependent on the residue number. Films of the oligomers, made by casting them from a dimethylformamide solution onto NaCl or KBr plates, take up an α-helical structure, and the α → β1  or α → β2 transition depends on the residue number of the cast film., application/pdf},
 pages = {3451--3459},
 title = {Two β-forms and the α-helix of N-octanoyl-L-glutamic acid oligomers},
 volume = {88},
 year = {1992}
}