monobasic (KH2PO4), potassium phosphate dibasic
(K2HPO4), mucin from porcine stomach (Type III),
ammonium dihydrogen phosphate (NH4H2PO4), dimethylformamide, acetonitrile (HPLC grade), and sodium hydroxide
pellets (NaOH) were purchased from Fisher Scientific. Ultrapure water
(18 MΩ) in-house station was obtained from Millipore Sigma.
Hydroxypropyl methylcellulose (Benecel E4M PHARM, HPMC) was provided
by Ashland, Inc., polyvinylpyrrolidone-vinyl acetate copolymer (Kollidon
VA 64) was provided by BASF. The chemical structures of Carvedilol,
nifedipine, and polymers are shown in
but a representative structure of the O-linked mucin glycopeptide
is shown in