tropate

tro·pate

(trō'pāt),
A salt or ester of tropic acid.
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5 mL) with internal standards tropate and 2-ketocaproate added are treated with hydroxylamine hydrochloride (30 min at 60 [degrees]C), acidified to pH 1 with HCI, saturated with NaCl, and extracted three times with 6 mL of ethyl acetate.
The internal standard tropate was considered as a general reference because its absolute m/z 280 abundance remains remarkably stable for all investigated occurrences (mean abundance [+ or -] relative SD in 10 urine samples, 9 477 700 [+ or -] 14%; in 10 aqueous solutions, 9 983 500 [+ or -] 13%).
For example, the abundance ratio of m/z 247 for 2-ketocaproate to m/z 280 for tropate is 0.