scholarly journals SPECTROCHEMICAL STUDY OF AMINO-ACID ANHYDRIDES. III. LIGHT ABSORPTION OF SOME N-SUBSTITUTED DIKETOPIPERAZINES AND SOME OTHER AMINO-ACID ANHYDRIDES

1929 ◽  
Vol 4 (9) ◽  
pp. 202-209 ◽  
Author(s):  
Tei-ichi Asahina
Keyword(s):  
Amino Acid ◽  
Light Absorption ◽  
Acid Anhydrides

scholarly journals Electrospinning and Post-Spun Chain Conformations of Synthetic, Hydrophobic Poly(α-amino acid)s

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 327 ◽  
Author(s):  
Kesavan Devarayan ◽  
Souta Nakagami ◽  
Shuichi Suzuki ◽  
Ichiro Yuki ◽  
Kousaku Ohkawa
Keyword(s):  
Amino Acid ◽  
Trifluoroacetic Acid ◽  
Average Molecular Weight ◽  
Helical Structure ◽  
Degree Of Polymerization ◽  
Random Coil ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
Acid Anhydrides ◽  
Chain Conformations

Electrospinning and post-spun conformations of hydrophobic poly(α-amino acid)s are described in this study. The poly(α-amino acid)s, poly(Gly), poly(l-Ala), poly(l-Val), and poly(l-Leu) were synthesized via corresponding N-carboxy-α-amino acid anhydrides. The average molecular weight and degree of polymerization of these polymers were determined by N-terminus labeling using 2,4-dinitrofluorobenzene and by viscometry in the case of poly(Gly). These poly(α-amino acid)s were electrospun from trifluoroacetic acid or trifluoroacetic acid/dichloromethane solutions. The FT-IR spectroscopy and wide-angle X-ray diffraction indicated that the electrospun poly(l-Ala) and poly(l-Leu) fibers predominantly adopts α-helical structure, whereas poly(l-Val) and poly(Gly) fibers exhibited mainly β-strand and random coil structures, respectively.

Stepwise synthesis of oligopeptides withN-carboxy ?-amino acid anhydrides

Biopolymers ◽  
1970 ◽  
Vol 9 (12) ◽  
pp. 1419-1427 ◽  
Author(s):  
Oshio Iwakura ◽  
Keikichi Uno ◽  
Masanao Oya ◽  
Ryoichi Katakai
Keyword(s):  
Amino Acid ◽  
Stepwise Synthesis ◽  
Acid Anhydrides
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