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HPLC Diode Array Detectors

A customer should be aware of the advantages a photo diode array detector brings to their analysis.

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"A customer should be aware of the advantages a photo diode array detector brings to their analysis," says John Pollard, Vice President of Sales, JASCO. "For example, some customers require a spectrum of the sample. A PDA detector offers spectra in addition to single wavelength data. The PDA detector also offers the added benefit of a generated library that is compiled as samples are run to help ensure sample purity and identification,"adds Pollard.

"Regarding technological advances, PDA detectors have been redesigned in recent years to allow faster data acquisition rates to ensure compatibility with UHPLC systems," says Pollard.
 
According to Moroni Mills, Senior Marketing Specialist, Gilson, Inc., "The researcher today really needs to determine what their true needs are in order to make the best decision on which diode array detector to choose."
 
Many diode array detectors on the market today improve resolution up to 1024 diodes. Does the researcher require this amount of resolution? With the movement toward ultra fast HPLC, many diode array detectors have much faster acquisition speeds for detecting accurately peaks with widths as low as one second. Wavelength range is also something that differs greatly between different diode array detectors on the market. Some detectors approach NIR ranges (Near InfRed), while others may only go up to 600 nm. Some diode array detectors feature fiber optic technology that allows flow cells to be positioned outside of the detector and connect directly to the column output. All of these functions have a purpose.

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