ABSTRACT
ABSTRACT OBJECTIVE：To establish a method for the determination of 5-hydroxyindole acetic acid（5-HIAA），glutamine， hippurate，pimelate，proline，tryptophan，tyramine，tyrosine and valine in human urine. METHODS：Morning urine samples were collected from depression patients. The sample was extracted with acetonitrile after addition of internal standard cortisone. LC-MS/ MS method was adopted. The determination was performed on XTerra RP18 column with mobile phase consisted of 0.1％ acetic acid-water as mobile phase A and 0.1％ acetic acid-acetonitrile as mobile phase B（gradient elution）. The column temperature was set at 40 ℃，and flow rate was 0.45 mL/min. Electrospray ion source（ESI）was used for quantitative analysis by multiple reaction monitoring （MRM）. The precursor/product ion transitions （m/z） were monitored at m/z 192.2→146.1，m/z 147.2→130.0，m/z 180.1→105.1，m/z 161.1→125.2，m/z 116.1→70.2，m/z 205.2→188.2，m/z 138.2→121.1，m/z 182.0→123.0，m/z 118.2→72.1 and m/z 361.2→163.0（+ion-mode）for 5-HIAA，glutamine，hippurate，pimelate，proline，tryptophan，tyramine，tyrosine，valine and cortisone，respectively. RESULTS：The linear range of 5-HIAA，glutamine，pimelate，proline，tyramine and valine were 10.00-3 200 ng/mL（r＝0.993 8-0.998 9，n＝6）. The lower limit of quantification was 10 ng/mL；the linear range of hippurate，tryptophan and tyrosine were 1 600-51 200 ng/mL（r＝0.999 2-0.999 7，n＝6）. The lower limit of quantitation was 1 600 ng/mL. The results of accuracy tests were 86.29％-98.65％（n＝6）. RSDs of intra-day and inter-day precision tests were no more than 14.65％（n＝6）CV of matrix effect were 6.18％-14.37％（n＝6）. Extraction recovery rates were 86.21％-98.14％（n＝6）. RE of stability tests were no more than 14.71％（n＝3-6）. CONCLUSIONS：The method is sensitive，accurate and suitable for the determination of 9 substances in human.
ABSTRACT
The use-dependent characteristics of daurisoline on monophasic action potentials (MAP) of the left ventricle of the rabbit heart in situ were recorded with MAP recording technique. The results showed that daurisoline decreased monophasic action potential amplitude (MAPA) and prolonged monophasic action potential duration at the 50% and 90% (MAPD50, MAPD90), effective refractory period (ERP), ERP/MAPD90 at the steady-state cycle lengths of 240, 210, 180 ms. The percent of prolongation of MAPD50 was 12.8±2.9, 9.5±2.6, 9.0±1.6, that of MAPD90 was 10.9±2.6, 7.5±2.4, 6.5±2.7, that of ERP was 25.7±4.3, 18.5±4.1, 24.2±7.2, and that of ERP/MAPD90 was 13.7±4.5, 10.2±2.2, 16.1±5.1, respectively. Its effect showed no relation to frequency (n=6, P>0.05). The effects of sotalol on MAP were similar to that of daurisoline, but it prolonged MAPD90 and ERP in a reverse use-dependent manner (P<0.05). It is concluded that daurisoline has no use-dependent effects on MAP of rabbit hearts.