Introduction

Densitometry is a means of measuring the concentration of chromatographic zones on the developed thin-layer chromatography high performance thin-layer chromatography (TLC in HPTLC) layer. The instrument does this without disturbing the substance in the chromatogram. The method and computer-controlled instrumentation produces results that are not only d p p d c c d c reproducible, but also highly accurate (&1% standard deviation). Scanning is a fast process (up to a scan speed of 100 mm s_1) with a spatial resolution in steps from 25 to 200 |im. Full UV/visible spectra (190-800 nm wavelength) of separated analytes can be recorded at high speed and peaks can be checked for purity by obtaining and comparing spectra from the start, middle and end of the peaks. With the use of highly sensitive charged coupled device (CCD) cameras, the photographic image of the developed TLC/HPTLC plate can be stored as a video image. This can be video-scanned to determine the concentration of separated components or can be printed when required as part of a document for a permanent record of the results. Many images can be stored on the computer hard drive and archived whenever required.

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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