Recen
t progress in me
tabolomics and
the developmen
t of increasingly sensi
tive analy
tical
techniques have renewed in
teres
t in global profiling, i.e., semiquan
ti
ta
tive moni
toring of all chemical cons
ti
tuen
ts of biological fluids. In
this work, we have performed global profiling of NIST SRM 1950, 鈥淢e
taboli
tes in Human Plasma鈥? using GC-MS, LC-MS, and NMR. Me
tabolome coverage, difficul
ties, and reproducibili
ty of
the experimen
ts on each pla
tform are discussed. A
to
tal of 353 me
taboli
tes have been iden
tified in
this ma
terial. GC-MS provides 65 unique iden
tifica
tions, and mos
t of
the iden
tifica
tions from NMR overlap wi
th
the LC-MS iden
tifica
tions, excep
t for some small sugars
tha
t are no
t direc
tly found by LC-MS. Also, repea
tabili
ty and in
termedia
te precision analyses show
tha
t the SRM 1950 profiling is reproducible enough
to consider
this ma
terial as a good choice
to dis
tinguish be
tween analy
tical and biological variabili
ty. Clinical labora
tory da
ta shows
tha
t mos
t resul
ts are wi
thin
the reference ranges for each assay. In-house compu
ta
tional
tools have been developed or modified for MS da
ta processing and in
terac
tive web display. All da
ta and programs are freely available online a
t ttp://peptide.nist.gov/" class="extLink">http://peptide.nist.gov/ and ttp://srmd.nist.gov/" class="extLink">http://srmd.nist.gov/.