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• W2078100931 abstract "A new HPLC method for the determination of 5-aminosalicylic acid (5-ASA) and N-acetyl-5-aminosalicylic acid (N-Ac-5-ASA) in human plasma was developed and validated. Plasma samples were analyzed after protein precipitation with methanol and the two analytes were separated using a C18 column with a mobile phase composed of 17.5 mmol/L acetic acid (pH 3.3):acetonitrile = 85:15 (v/v) at 0.2 mL/min flow rate. 4-ASA and N-Ac-4-ASA were used as internal standards. Selective detection was performed by tandem mass spectrometry with electrospray source, operating in negative ionization mode and in multiple reaction monitoring acquisition (m/z 152 → 108 for 5-ASA; m/z 194 → 150 and 194 → 107 for N-Ac-5-ASA). The limit of quantification (LOQ) was 50 ng/mL for both analytes (0.2 ng injected) and matrix-matched standard curves showed linearity up to 4000 ng/mL. In the entire analytical range the within- and between-batch precision (R.S.D.%) values were respectively ≤6.3% and ≤11% for 5-ASA and ≤8.0% and ≤10% for N-Ac-5-ASA. For both analytes the within- and between-batch accuracy (bias%) values ranged respectively from −8.4% to 7.9% and from −7.9% to 8.0%. The overall recoveries (n = 6) at three tested concentration levels (i.e. 100, 1000 and 4000 ng/mL) were respectively >90% for 5-ASA and >95% for N-Ac-5-ASA (R.S.D.% ≤ 10%). The method was applied to evaluate the pharmacokinetic of 5-ASA after a single oral dose administration of this compound (1200 mg) to 24 healthy volunteers. The mean maximum concentration levels were 680 ng/mL for 5-ASA and 1240 ng/mL for N-Ac-5-ASA and the kinetic profiles were in agreement with previous studies." @default.
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• W2078100931 date "2008-09-01" @default.
• W2078100931 modified "2023-10-18" @default.
• W2078100931 title "Development and validation of a HPLC-ESI-MS/MS method for the determination of 5-aminosalicylic acid and its major metabolite N-acetyl-5-aminosalicylic acid in human plasma" @default.
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• W2078100931 doi "https://doi.org/10.1016/j.jchromb.2008.07.026" @default.
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