Chemistry Commons^™

Protein Lc-Ms Using Slip Flow Chromatography, Ximo Zhang

Open Access Dissertations

Histones are essential chromosomal proteins with large numbers of variants and post-translational modifications (PTMs). PTM levels of histones are known to correlate with different stages of cancer. Due to the lack of resolution on intact histone separations, conventional methods for histone analysis require time-consuming digestion, which often leads to the loss of PTM information. Slip flow chromatography with orderly packed nonporous silica particles has been shown to greatly increase the efficiency of protein separation by reducing eddy diffusion and resistance to mass transfer. In this work, higher resolution for intact histones separation was achieved by using a 5 cm capillary …

Elucidation Of Chiral Recognition Mechanisms Of Solutes By Amylose Tris[(S)-Alpha-Methylbenzylcarbamate] Sorbent, Hung-Wei Tsui

Open Access Dissertations

Enantioselective separations of chiral molecules are important in various chemical fields, such as pharmaceuticals and agrochemicals industries. Polysaccharide-based sorbents have been widely used in chiral liquid chromatography. The recognition mechanisms which determine their enantioselectivities are not completely understood.

In this dissertation, the chiral recognition mechanisms of a widely used commercial sorbent, amylose tris[(S)-alpha-methylbenzylcarbamate], for benzoin (B) enantiomers were first studied. The HPLC data for benzoin with pure n-hexane as the mobile phase have been obtained. The behavior of sorbent-solute-hexane systems can be interpreted by considering only sorbent solute two-component interactions. Infrared (IR) spectra showed evidence of substantial hydrogen bonding (H-bonding) …