Chromatographic Isolation of the Polymer Diazoluminomelanin and Related Components
Abstract
The specific objective of this project has been to provide chemical characterization towards the polymer diazoluminomelanin (DALM) and related products, which have proven to be of significant interest to the USAF. Our method of characterization of the DALM polymer has been focused initially on the sole characterization of the polydiazotized-3-amino-L-tyrosine (P-DAT) polymer. The initial aqueous reaction between 3-amino-L-tyrosine (3-AT) and nitrous acid was studied in detail along with several analogs of 3-AT. The methodologies used to characterize this polymer and related analog polymers included, but was not limited to, CE, CE-MS, HPLC, ESI-MS, APCI-MS, HPLC-ESI-MS, MALDI-TOF-MS, H-1-NMR, C-13-NMR, ESR, DCS, UV/Vis, IR, Pyrolysis-GC-MS and elemental analysis. Two analog polymers, p-HAHA and p-Tyr, with both show similar properties were characterized also. Our findings indicate that p-DAT is a heterogeneous polymer consisting of multiple modes of polymerization. The polymer is a stable radical even at RT. Based on our current findings, the polymer contains azo-, azoxy, ether, and phenylene linkages. The predominance of each type of linkage was not established.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 2000
- Accession Number
- ADA380829
Entities
People
- Joel T. Smith