Glycophorin A and its isolated transmembrane region (GpATM) are each known to form sequence-specific dimers in SDS micelles. Whether this behavior accurately reflects behavior in red cell membranes or lipid bilayers, however, has remained unclear. Resonance energy transfer between labeled GpATM peptides has been used to observe dimerization of GpATM in bilayers. Separate populations of GpATM pe...

Separation of some biogenic amines via RP-HPLC using mixed micellar mobile phase was investigated. The compounds were derivatized before hand by dansyl chloride as a chromophoric reagent. Appropriate conditions for separation, were determined by studying factors such as temperature, type and percentage of organic modifier, concentration of surfactants (SDS and Brij-35) and the pH of the mob...

In this contribution we report studies on enzymatic activity of alpha-chymotrypsin (CHT) upon complexation with cationic cetyltrimethylammonium bromide (CTAB) micelle. With picosecond time resolution, we examined solvation dynamics at the interface of CHT-micelle complex, and rigidity of the binding. We have used 5-(dimethyl amino) naphthalene-1-sulfonyl chloride (dansyl chloride; DC) that is c...

A simple method was developed to determine histamine, an important compound in chemical food poisoning, by extraction followed by hydrophilic interaction chromatography-tandem mass spectrometry using a hydrophilic column with sulfobetaine-type zwitterion groups. The quantitation range in seafood products was from 0.4 to 200 mg kg(-1) for 5 g food samples. Quantitative recoveries were obtained...

Merrifield resin was converted to various dialkyl-trihydroxybenzaldehyde resins and then to different bound imine resins. Fluorescence spectroscopy was used to continuously monitor the intermediates performed on the resins. Using fluorescent label (dansyl chloride) information on the kinetics of the amine cleavage was obtained. This study demonstrated that direct measures of fluorescence intens...

In recent years increased concentrations of the polyamines putrescine, spermidine and spermine have been reported in body fluids from humans and animals with a variety of malignant disorders. In addition, changes occurring in the spermidine/putrescine ratio in urine from cancer patients receiving chemotherapy appeared to provide an indication of the success or failure of the particular chemothe...

separation of some biogenic amines via rp-hplc using mixed micellar mobile phase was investigated. the compounds were derivatized before hand by dansyl chloride as a chromophoric reagent. appropriate conditions for separation, were determined by studying factors such as temperature, type and percentage of organic modifier, concentration of surfactants (sds and brij-35) and the ph of the mobile ...

The complex of hyaluronic acid (HA)-binding region, link protein, and hyaluronic acid was isolated from trypsin digests of bovine nasal cartilage proteoglycan aggregates and the HA-binding region was then purified from the complex. After dansylation of accessible amino groups, less than 15% of the HA-binding region molecules interacted with hyaluronic acid. Conversely, after acetylation with 2....

A novel manual method for protein-sequence analysis is described. Three peptides, the hexapeptide (Leu-TRP-Met-Arg-Phe-Ala), insulin A chain and glucagon were used to test this technique. Peptides (1 or 2 nmol) were hydrolysed with acid and their qualitative amino acid compositions were confirmed by reacting with 4-NN-dimethylaminoazobenzene-4'-sulphonylchloride and 4-NN-dimethylaminoazobenzene...