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Description: Refurbished high quality gas and liquid chromatography systems, HPLC, GC.
Summary: Leading supplier of refurbished and used laboartory equipment -
Information: HPLC is a popular method of analysis because it is easy to learn and use and is not limited by the volatility or stability of the sample compound. Modern HPLC has many applications including separation, identification, purification, and quantification of various compounds. Prior to the 1970's, few reliable chromatographic methods were commercially available to the laboratory scientist. During 1970's, most chemical separations were carried out using a variety of techniques including open-column chromatography, paper chromatography, and thin-layer chromatography. However, these chromatographic techniques were inadequate for quantification of compounds and resolution between similar compounds. During this time, pressure liquid chromatography began to be used to decrease flowthrough time, thus reducing purification times of compounds being isolated by column chromatogaphy. However, flow rates were inconsistant, and the question of whether it was better to have constant flow rate or constant pressure was debated. (Analytical Chem. vol 62, no. 19, oct 1 1990).