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The present paper reports the application of an optimized pre-column derivatization procedure with aminoquinolyl-N-hydroxysuccinimidyl carbamate (AQC) to the determination of 21 free amino acids in fruit juices. The method permitted the optimal separation of 21 amino acids and ammonium in 30 min. Excellent response linearity was obtained from 2 to 1,000 μM for all amino acids, except tryptophan, for...
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