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Improved detection and measurement of low levels of [18F]fluoride metabolized from [18F]-labeled pyrimidine nucleoside analogues in biological samples.

Abstract：

INTRODUCTION:It is important to identify all circulating metabolites, including free fluoride, for accurate pharmacokinetic modeling of [(18)F]-labeled radiotracers. We sought to determine the most efficient method to detect and quantify low levels of free [(18)F]fluoride in biological samples. METHODS:Low levels of [(18)F]fluoride were analyzed using two methods: (A) an ion-exchange cartridge and gamma counting, and (B) radio-HPLC, to compare the detection limits of these two analytical methods. Twenty microliters of [(18)F]fluoride solution was loaded onto an ion-exchange cartridge, then eluted with 20% MeCN/water (5 ml) and radioactivity trapped in the cartridge counted on a gamma counter. [(18)F]Fluoride was also determined in plasma and urine from mice injected with [(18)F]-labeled thymidine analogues using Method A. RESULTS:The detection sensitivity of Method A was 9.4-fold higher than that of Method B (0.075±0.004 vs. 0.71±0.02 nCi). With Method A, [(18)F]fluoride was determined in plasma for [(18)F]FLT, [(18)F]FMAU, [(18)F]FEAU and N(3)-[(18)F]FPrT as 1.4±0.31% (n=4), 0.17±0.49% (n=3), 4.88±1.62% (n=3) and 12.94±0.48% (n=4), respectively. The amount of [(18)F]fluoride determined in the urine was 11.49±1.60% (n=4) from [(18)F]FLT, 5.36±2.34% (n=3) from [(18)F]FMAU, 13.57±1.96% (n=3) from [(18)F]FEAU and 11.19±1.98% (n=4) from N(3)-[(18)F]FPrT. CONCLUSION:Low levels of [(18)F]fluoride in biological samples can be detected and quantified using an ion-exchange cartridge and gamma counting. This methodology is simple, accurate and superior to the standard use of radio-HPLC on a C(18) column for metabolite analysis, and it should be useful in pharmacokinetic modeling for animal imaging studies using an [(18)F]-labeled radiotracer and PET.

journal_name

Nucl Med Biol

journal_title

Nuclear medicine and biology

authors

Paolillo V,Yeh HH,Mukhopadhyay U,Gelovani JG,Alauddin MM

doi

10.1016/j.nucmedbio.2011.05.008

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

1129-34

issue

8

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(11)00126-0

journal_volume

38

pub_type

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