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. 2011 Feb 23;7(4):469–484. doi: 10.1007/s11306-011-0289-0

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© The Author(s) 2011

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Fig. 5 — Flow Infusion Electrospray ionization Mass Spectrometry intensity plots of ions indicative of proline betaine and 4-hydroxy-proline betaine in a urine time course. PB proline betaine, 4-HPB 4-hydroxy-proline betaine; Log10/TIC, normalization using sample total ion count (TIC) and logarithmic transformation of data; ‘PRE’, pool of the pre-test day over-night urine voids; ‘0’, fasting spot urine sample after a 12 h (minimum) fast; ‘2’, ‘4’, ‘6’ and ‘8’, postprandial urine samples (with a light lunch consumed after the 4 h sample collection)