Chiral HPLC Separation and Modeling of Four Stereomers of DL-Leucine-DL-Tryptophan Dipeptide on Amylose Chiral Column.
Chiral high-performance liquid chromatography (HPLC) separation and modeling of four stereomers of DL-leucine-tryptophan DL-dipeptide on AmyCoat-RP column are described. The mobile phase applied was ammonium acetate (10 mM)-methanol-acetonitrile (50:5:45, v/v). The flow rate of the mobile phases was 0.8 mL/min with UV detection at 230 nm. The values of retention factors for LL-, DD-, DL-, and LD- stereomers were 2.25, 3.60, 5.00, and 6.50, respectively. The values of separation and resolution factors were 1.60, 1.39, and 1.30 and 7.76, 8.05, and 7.19. The limits of detection and quantitation were ranging from 1.0-2.3 and 5.6-14.0 μg/mL. The simulation studies established the elution orders and the mechanism of chiral recognition. It was seen that π-π connections and hydrogen bondings were the main forces for enantiomeric resolution. The reported chiral HPLC method may be applied for the enantiomeric separation of DL-leucine-DL-tryptophan in unknown matrices. Chirality 28:642-648, 2016. © 2016 Wiley Periodicals, Inc.
['Alajmi|Mohammed F|MF|', 'Hussain|Afzal|A|', 'Suhail|Mohd|M|', 'Mukhtar|Sofi Danish|SD|', 'Sahoo|Dibya Ranjan|DR|', 'Asnin|Leonid|L|', 'Ali|Imran|I|']
D000688:Amylose D002851:Chromatography, High Pressure Liquid D004151:Dipeptides D007930:Leucine D057230:Limit of Detection D015203:Reproducibility of Results D012680:Sensitivity and Specificity D013237:Stereoisomerism D014364:Tryptophan
HPLC DL-Leucine-DL-tryptophan dipeptide AmyCoat-RP chiral resolution modeling studies