Analysis for transaminases in serum with an amperometric glutamate electrode.
We determined transaminases in human blood serum with an amperometric glutamate biosensor. The probe was a hydrogen peroxide sensor assembled with appropriate selective membranes to enhance the probe specificity and lifetime. Calibration curves of glutamate were linear in the range 1-1000 mumol/L, with a response time of < 1 min. This probe was subsequently applied to the measurement of activities of aspartate and alanine aminotransferases in human sera. Analytical recovery studies demonstrated the suitability of the glutamate sensor by measuring 91-99% of added glutamate, 92-106% of added aspartate aminotransferase, and 101-105% of added alanine aminotransferase. Transaminase activity measured in 80 sera correlated well with results obtained with a spectrophotometric procedure.
Dipartimento di Biologia, Università di Roma, Italy.
D
D
Compagnone
G
G
Federici
R
R
Massoud
L
L
Santoro
M
M
Anichini
G
G
Palleschi
D000410:Alanine Transaminase / Q000097:blood*; D000594:Amino Acid Oxidoreductases; D001219:Aspartate Aminotransferases / Q000097:blood*; D015374:Biosensing Techniques / Q000592:standards; D002021:Buffers; D005971:Glutamates; D018698:Glutamic Acid; D006801:Humans; D006863:Hydrogen-Ion Concentration; D011786:Quality Control; D013053:Spectrophotometry
D002021:Buffers; D005971:Glutamates; D018698:Glutamic Acid; D000594:Amino Acid Oxidoreductases; C023061:L-glutamate oxidase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase