Introduction

Preparative supercritical fluid chromatography (Prep-SFC) came about at the same time as analytical supercritical fluid chromatography (SFC). During the 1960s and 1970s at the time of the early development of SFC, several authors included fraction collectors at the outlet of their analytical supercritical fluid (SF) chromatographs. However, the technological difficulties encountered kept these attempts somewhat marginal. The real interest in Prep-SFC appeared in incorporation of a technique into routine analysis represents a major expansion. This trend should continue, since the surprisingly low cost of operation and environmental friendliness are becoming more widely understood and appreciated.

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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