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Abstract
Fourier descriptor (FD) values computed from spectrophotometric measurements were used to compute a purity index. The Fourier Descriptors calculated for a set of absorbencies are independent of concentration and is sensitive to the presence of interferents. Such condition was proven by calculating the FD for pure and degraded benyzylpenicillin. Absorbance data were measured and recorded for twelve different benzenoid compounds. The calculated FD values for these compounds showed significant discrimination between them. Also the reproducibility of FDs was tested by measurement over several successive days and the relative standard deviation obtained was less than 2 %.
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