In this work, an improved single-column chromatographic (ISCC) separation process is proposed. The term `improved' refers to both conceptual and physical modifications compared to the available single-column processes, including a novel fraction collection scheme and allowing overlapped peaks from adjacent cycles. Also the fraction collection mechanism was modified in order to facilitate online...

Traditionally, column performance in liquid chromatography has been studied using information from the elution of probe compounds at different flow rates through van Deemter plots, which relate the column plate height to the linear mobile phase velocity. A more recent approach to characterize columns is the representation of the peak widths (or the right and left peak half-widths) for a set of ...

The group of LiChrospher alkyl-diol silica (ADS) phases that make part of the unique family of restricted-access materials, have been developed as special packings used in the liquid chromatographic integrated sample processing of biofluids. The advantage of these phases lies in the possibility of direct injection of untreated plasma. An on-line elimination of the protein matrix is achieved wit...

This paper presents a new HPLC technique for the determination of biogenic cations such as amino acids and nucleobases, using a weak-acid cation-exchange column. Fourteen analytes, five amino acids and seven bases in addition to creatinine and creatine, were separated in 12 min by means of a two-liquid gradient elution with UV detection. The newly released column packed with a carboxy-functiona...

A simple, sensitive and accurate reversed phase high performance liquid chromatographic method for terbinafine and bezafibrate drugs. This method is developed for terbinafine and bezafibrate drugs. Reversed phase chromatographic separation of the two drugs was performed a C18 column is used with different mobile phases of methanol, water, ammonium dihydrogen phosphate and methanol, acetonitrile...

A simple, rapid and precise reverse-phase high performance liquid chromatographic method has been developed for the quantitative determination of piperine from Ayurvedic Polyherbal formulations Arkavati, Krvyadras and Marichyadi taila. Chromatographic analysis was carried out on cosmosil C18 column (150mm x 4.6mm, 5μm particle) with a mobile phase of methanol: water in the volume ratio of 70:30...