Also, they added, it is difficult to measure caffeine exposure accurately.
In addition, a nanobody with specificity to small caffeine molecules has been used in an ELISA to measure caffeine concentration in beverages [17].
In vivo CYP1A2 activity was assessed by measuring caffeine metabolites in urine.
Caffeine half life (proxy for clearance) was determined by measuring caffeine in saliva after a caffeine challenge.
They measured caffeine, fecal coliforms, and the antiseizure medication carbamazepine, another candidate chemical indicator of human sewage contamination.
A new study indicates that measuring caffeine in municipal water systems provides a good estimate of fecal contamination caused solely by humans.
However, because NAT2 was not associated with caffeine intake in the DCCT/EDIC study or in previous studies future studies measuring caffeine metabolites are needed to more concretely examine their independent effects, as well as establishing whether caffeine metabolites are associated with SIF.
Over 60% of subjects had four or five measures of caffeine intake from FFQs completed during the EDIC study (range, one to seven), and approximately 50% had three measures of caffeine intake from diet histories completed during the DCCT (range, one to six).
Caffeine intake measured using the FFQ during the EDIC study was used as our primary measure of caffeine exposure.
In 2007, Consumer Reports measured the caffeine in 36 small cups of decaffeinated coffee from restaurants and coffee shops in Yonkers.
