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. Fig, Fluorescence intensity (? ex =415 nm / ? em =485 nm) of an ammonium standard adduct 432 (100 ?M) over a period of 60 days depending on the reducing agent used. [OPA]: 8 mM mM, p.8

. Fig, Evolution of fluorescence intensity (? ex =415 nm / ? em =485 nm) of an ammonium 435 standard adduct (100 ?M) over a period of 70 days as a function of TCEP concentration. 436 [OPA]: 8 mM mM, p.8

. Fig, Evolution of the slope of calibration curves over time depending on conservation mode 438 of reagents. A: OPA and NAC mixed reagent; B: OPA and NAC separated liquid reagents; C: 439 solid NAC and liquid OPA. Confidence intervals (CI) are represented in dotted lines. [OPA]: 440 8 mM mM mM, pp.8-9

. Fig, Screening of biogenic amines and primary amino acids (25 µM) [OPA]: 8 mM mM; [TCEP]: 1 mM; carbonate buffer pH=10, p.8