Preparative Paper Chromatography

For a time preparative paper chromatography was an important method for the isolation of substances, leading to comments such as: 'These methods are so well developed today that some laboratories prefer them to the methods of column chromatography'. The simplest methods of preparative paper chromatography were essentially scaled-up versions of the analytical methodology using either several sheets of paper or custom-made preparative cardboards (e.g. Schleicher & Schull 2071). In addition, techniques were developed such as the Chromatopile (a number of discs of filter paper in a tightly compressed stack to form a column, with development by either ascending or descending chromatography), the Chromatopack (strips or sheets of paper pressed together to form a block which was then developed as if it were a single sheet) or rolls of filter paper wound over a core of polyethylene and inserted into a polyethylene column (sometimes these rolls were placed in a pressurized jacket). Using such techniques the preparation of milligram quantities of material was readily achieved.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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