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      주제어 : Newborn screeningAbbreviation: PKU: phenylketonuria (검색결과 1 건)
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        Two Step Derivatization for the Analyses of Organic, Amino Acids and Glycines on Filter Paper Plasma by GC-MS/SIM

        Hye-Ran Yoon 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.3

        A rapid dried-filter paper plasma-spot analytical method was developed to quantify organic acids, amino acids, and glycines simultaneously in a two-step derivatization procedure with good sensitivity and specificity. The new method involves a two-step trimethylsilyl (TMS) - trifluoroacyl (TFA) derivatization procedure using GC-MS/ selective ion monitoring (GC-MS/SIM). The dried-filter paper plasma was fortified with an internal standard (tropate) as well as a standard mixture of distilled water and methanol. Methyl orange was added to the residue as an indicator. N-methyl-N-(trimethylsilyl-trifluoroacetamide) and N-methyl-bis-trifluoroacetamide were then added and heated to 60oC for 10 and 15 min to produce the TMS and TFA derivatives, respectively. Using this method, the silylation of carboxylic functional groups was carried out, which was followed by the trifluoroacyl derivatization of the amino functional group. The derivatives were analyzed by GC-MS/SIM. A calibration cure showed a linear relationship for the target compounds between concentrations of 10-500 ng/mL. The limit of detection and quantification on a plasma spot were 10-90 ng/mL (S/N=9) and 80-500 ng/ mL, respectively. The correlation coefficient ranged from 0.938 and 0.999. When applied to the samples from positive patients, the method clearly differentiated normal subjects from the patients with various metabolic disorders such as PKU, MSUD, OTC and a Propionic Aciduria. The new developed method might be useful for making a rapid, sensitive and simultaneous diagnosis of inherited organic and amino acid disorders. In addition, this method is expected to be an alternative method for screening newborns for metabolic disorders in laboratories where expensive MS/MS is unavailable.

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