Time-resolved fractionation of bone and liver alkaline phosphatase activities with a 'peeling-off' method

Giacinto Abele Donato Miggiano, Alvaro Mordente, G. E. Martorana, A. Castelli

Risultato della ricerca: Contributo in rivistaArticolo in rivista

1 Citazioni (Scopus)


A procedure for the selective fractionation of the bone and liver alkaline phosphatase activity in tissue extracts and human sera is proposed. Optimized conditions of the assay are: urea 3.7 mol/l in 0.5 mol/l DEA buffer, pH 9.8; 0.5 mmol/l MgCl2; 10.0 mmol/l p-nitrophenyl phosphate. The sample is diluted 1:20 in the reagent solution and the activity is recorded for 10 min at 37 degrees C. By means of a computerized or manual graphic analysis, based on 'peeling-off' the exponentials, the two differently urea-sensitive subforms are identified and the slow-(liver) and the fast-decaying (bone) activities are easily discriminated and their respective values calculated. Interference due to the intestinal isoenzyme can be also accounted for. The analytical variability is very satisfactory (within run CV = 7.5 and 4.5% for osseous and hepatic form, respectively; day-to-day CV less than 10% for both). The lower limits of detection are about 10 U/l and the serum or plasma reference values together with the influence on the assay of hemoglobin and protein content are also investigated.
Lingua originaleEnglish
pagine (da-a)61-67
Numero di pagine7
Stato di pubblicazionePubblicato - 1989


  • Adult
  • Aged
  • Alkaline Phosphatase
  • Bone and Bones
  • Chemical Fractionation
  • Hot Temperature
  • Humans
  • Isoenzymes
  • Liver
  • Middle Aged
  • Urea


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