TY - JOUR
AU - Harada, Kaoru
AB - September, 1959] SHORT COMMUNICATIONS 1007 Thermal Homopolymerization of Lysine and Copolymerization with. Neutral and Acidic Amino Acids1) By Kaoru HARADA (Received July 15, 1959) Glutamic acid and aspartic acid charac- teristically yield copolymers2,3) with un- substituted amino acids which fail to form polymers when heated individually, By using an excess of acidic amino acids, it is furthermore possible to copolymerize eighteen common amino acids into a proteinoid4). The special effects of basic amino acids, particularly lysine, are also interesting. Free DL-lysine was converted to its liquid The free lysine also copolymerized easily with glycine, alanine and other neutral amino acids, glutamic acid, aspartic acid, caprolactam, succinic acid, terephthalic acid and other carboxylic acids. After acidic hydrolysis, component amino acids were identified by paper chromatography. Infrared absorption spectra of lysine homo- polymer, lysine-neutral amino acid copoly- mers and lysine-glutamic acid copolymer indicated that these are typical poly- peptides. The salient maxima at 3080, 3280, 1630 and 1540cm-1; however, lysine- aspartic acid copolymer shows additional bands at 1720 and 1780cm-1 which indicate the 5 membered cyclic imide structure5), Some of the yield and amino acid com- position of typical polymers are as follows: DL-Lysine homopolymer* 1) Contribution No. 116 of the 
TI - Thermal Homopolymerization of Lysine and Copolymerization with Neutral and Acidic Amino Acids
JO - Bulletin of the Chemical Society of Japan
DO - 10.1246/bcsj.32.1007
DA - 2006-04-12
UR - https://www.deepdyve.com/lp/oxford-university-press/thermal-homopolymerization-of-lysine-and-copolymerization-with-neutral-UvYIDpp8Tj
SP - 1007
EP - 1008
VL - 32
IS - 9
DP - DeepDyve
ER -