Article: Studies from Groningen University describe new findings in enzyme research.

"C-13-urea may be a suitable marker to assess the in vivo fate of colon-targeted dosage forms given by mouth. We postulated that release in the colon (urease-rich segment) of C-13-urea from colon-targeted capsules would lead to fermentation of C-13-urea by bacterial ureases into (CO2)-C-13," investigators in Netherlands report (see also Enzyme Research).

"Subsequent absorption into the blood and circulation would lead to detectable C-13 (as (CO2)-C-13) in breath. If, however, release of C-13-urea occurred in the small intestine (urease-poor segment), we expected detectable C-13 (as C-13-urea) in blood but no breath C-13 (as (CO2)-C-13). The differential kinetics ...

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