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Table 4 Principal positive ions that decrease during aging. Retention time, measured m/z, calculated m/z, postulated identity, and elemental composition of positive ions that decrease during aging.

From: Metabonomics evaluations of age-related changes in the urinary compositions of male Sprague Dawley rats and effects of data normalization methods on statistical and quantitative analysis

Retention time (min)

Measured m/z (Da)

Calculated m/z (Da)

Postulated identity (with tR of standard)

Elemental composition of [M+H] ion

3.87

297.1445

297.1450

 

C14H21N2O5

3.88

303.0738

   

4.91

305.1582

305.1576

 

C12H26O7Na

5.24

349.1832

349.1838

 

C14H30O8Na

5.91

431.0992

   

6.82

233.0963

   

6.87

447.0938

   

8.91

410.1856

   
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BMC Bioinformatics

ISSN: 1471-2105

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