Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Determination of NHS-FA conjugation with CS.
Notes: (a) CS has an extremely weak absorption peak at 300 nm. (b) FA-CS has three absorption peaks, at 281 nm, 300 nm, and 343 nm, respectively. (c) NHS-FA has a strong absorption peak at 281 nm and a weak absorption peak at 343 nm.
Abbreviations: CS, chitosan; FA-CS, the folate-conjugated chitosan; NHS-FA, N-hydroxysuccinimide ester of folate.
