Measurement of free and total hydroxyproline by automated flow injection of serum or urine samples from maintenance hemodialysis patients with renal osteodystrophy.

Abstract:

:An automated measurement of total and free hydroxyproline in serum or urine is presented that uses flow injection analysis. After exclusion of nonspecific substances, hydroxyproline was oxidized by chloramine-T and L-cysteine with Ehrlich's reagent. The linearity obtained was from 3.8 mumole/L to 1.22 mmole/L with good precision (CV < 3%). Comparison of the proposed method with HPLC yielded r = 0.939 as the correlation coefficient. Reference intervals of free and total hydroxyproline are 1.4-9.7 mumole/L, 3.8-27.2 mumole/L for serum, and 10.0-72.5 mumole/L, 25.2-303.6 mumole/L for urine, respectively. Serum free and total hydroxyproline levels in renal osteodystrophy patients on maintenance hemodialysis (N = 71) were significantly higher than in controls (P < 0.0001). This method is superior to the use of HPLC with regard to stability of the color reaction. The measurement of serum free and total hydroxyproline is a useful marker for therapeutic observation of renal osteodystrophy patients.

journal_name

J Clin Lab Anal

authors

Uji Y,Karmen A,Okabe H,Hata K,Miura M,Ozaki K,Minamizaki M,Shibata T,Inayama S

doi

10.1002/jcla.1860080504

subject

Has Abstract

pub_date

1994-01-01 00:00:00

pages

267-72

issue

5

eissn

0887-8013

issn

1098-2825

journal_volume

8

pub_type

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