ABSTRACT
Alkaloids and flavonoids in flowers, flower buds, stems, leaves, and bulbs of Fritillaria thunbergii were identified by LC-LTQ-Orbitrap MSn.Alkaloids were identified by ACQUITY UPLC BEH C₁₈（2.1 mm×50 mm, 1.7 μm ) chromatographic column with a mobile phase of 10 mmol•L⁻¹ ammonium formate-acetonitrile and gradient elution in positive MS scan mode.Meanwhile, flavonoids were analyzed by Agilent-Zorbax SB C₁₈ (4.6 mm×250 mm, 5 μm) chromatographic column with a mobile phase of 0.2% acetic acid-acetonitrile and gradient elution in negative MS scan mode.Combined with literature reports, chemical constituents were identified and determined by accurate molecular weights and fragment ion peaks in the ESI-MS/MS spectra based on high resolution mass spectrometer.In all parts of F.thunbergii, 37 alkaloids including 7 alkaloids (zhebeininoside, peimisine, peimine, peiminine, ebeiedinone/puqiedinone, ebeiedine/ puqiedine, peimisine-N-oxide) were simultaneously analyzed.Moreover, 16 flavonoids including quercetin, kaempferol and their glycosides were identified.The results indicated that the aerial parts had the similar alkaloids as the bulbs on the whole.Meanwhile, it had a series of flavonoids undetected in the bulbs.Our results provided the scientific basis for the development and utilization of aerial parts of F.thunbergii.
ABSTRACT
<p><b>BACKGROUND</b>Invasive intravascular ultrasound (IVUS) is current diagnostic standard for myocardial bridging (MB). Non-invasive multislice computerized tomography coronary angiography (MSCT) technique has provided a good anatomical view of the tunnel artery now.</p><p><b>METHODS</b>A total of 51 consecutive patients with atypical or typical angina scheduled for IVUS were enrolled in this study and MSCT was performed 7 days before IVUS. Coronary imaging was quantified using IVUS and MSCT. Four main vessels (left main artery (LMA), left anterior descending (LAD), left circumflex (LCX), right coronary artery (RCA)) were examined.</p><p><b>RESULTS</b>Forty-one out of 51 (80%) patients received metaprolol (25 mg) before the MSCT scan and 25 of them were current beta-blocker users. The mean heart rate was (64 +/- 3) beats per minute. A total of 51 patients underwent IVUS examination (30 with MB and 21 without MB) were chosen for this study. Twenty-eight out of 30 MB cases were correctly diagnosed by MSCT and 2 patients with MB were not detected. Comparison with IVUS, the sensitivity of detection by MSCT was 93%, specificity was 100%. The lumen diameter of the tunnel artery derived from MSCT and IVUS significantly decreased from (2.9 +/- 0.3) mm to (2.4 +/- 0.4) mm (P < 0.001) and from (3.3 +/- 0.3) mm to (2.6 +/- 0.5) mm (P < 0.001), respectively. Minimal and maximal diameters of MB derived from MSCT were significantly smaller than those from IVUS ((2.4 +/- 0.4) mm vs (2.6 +/- 0.5) mm, P < 0.05 and (2.9 +/- 0.3) mm vs (3.3 +/- 0.3) mm, P < 0.05), respectively.</p><p><b>CONCLUSIONS</b>MSCT offers a reliable non-invasive method for MB in LAD and atherosclerosis diagnosis with diagnostic accuracy comparable with invasive IVUS.</p>