CONJUGATION PATTERNS OF ENDOGENOUS PLASMA-CATECHOLAMINES IN HUMAN AND RAT - A NEW SPECIFIC METHOD FOR ANALYSIS OF GLUCURONIDE-CONJUGATED CATECHOLAMINES

  • 1 January 1983
    • journal article
    • research article
    • Vol. 101  (1) , 141-151
Abstract
Plasma free, sulfoconjugated and glucuronoconjugated CA [catecholamines] were determined radioenzymatically before and after hydrolysis. CA sulfates and glucuronides were hydrolyzed by sulfatase and Ketodase, respectively. Total CA conjugates were deconjugated by acid lyophilization. On the basis of data obtained from systematical studies on these methods, the conjugation patterns of endogenous plasma CA in human and rat were qualitatively and quantitatively identified. In human plasma, sulfation is the sole conjugation mode for DA [dopamine], NE [norepinephrine] and E [epinephrine]; in rat plasma, sulfation also occurs in DA, NE and E but the quantities of the sulfates are small, while glucuronidation predominates in DA and occurs exclusively in DA but not in NE and E; in both species, conjugation is preferential for DA rather than NE and E. A new specific method for analysis of glucuronoconjugated CA was developed.

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