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A method for the quantitative determination of oligogalacturonic acids (OGAs) by on-line high-performance liquid chromatographic (HPLC) separation and mass spectrometric detection via an electrospray interface (ESI-MS) without additional desalting steps was developed. Saturated OGAs up to a degree of polymerization (dp) of 3 were quantified by comparison with reference compounds. The calibration plots...
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