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Table 5 Principal negative ions that increase during aging. Retention time, measured m/z, calculated m/z, postulated identity, and elemental composition of negative ions that increase 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
2.38 224.0210    
2.40 468.0941    
3.53 252.0544    
4.62 247.1055 247.1083 6-Hydroxymelatonin (4.59) C13H15N2O3
4.78 276.0547    
4.85 308.1167    
5.50 273.0063 273.0069 Ferulic acid sulfate C10H9SO7
5.53 275.0220 275.0225   C10H11SO7
6.14 222.0764    
6.93 173.0806 173.0814 Suberic acid (6.92) C8H13O4