Peak detection and resolution enhancement

(1) can be applied to again, to determine the approximate derivative at the next higher order. The approximate derivative calculation at a higher order can be generalized as  

In modern chemical laboratories, new types of instrument known as hyphenated instruments, such as HPLC-DAD. GC-MS, GC-FTIR and CE-DAD, have become very powerful tools for quantitative and qualitative analysis. These instruments can provide information from both chromatographic and spectroscopic studies at the same time. However, two-way data 

Reproduced from reference [42 J with the kind permission of Elsevier Science. 

Two special applications of WT to chromatographic studies have been reported in recent years. Collantes et al. [44] proposed the employment of the wavelet packets transform (WPT) for pre-processing HPLC results by an artificial neural network. The application of WPT for data processing in chemistry is very rare. These authors aimed to evaluate several artificial 

In conclusion, wavelet transforms have been employed by analytical chemists to solve various problems in chromatographic studies. Owing to the popularity of hyphenated instruments, more applications based on two-dimensional wavelet transform (2D-WT) will be developed. The 2D-WT technique is more suitable for processing data produced from such instruments. 

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