Soluble in Chloroform,Dichloromethane,Ethyl Acetate,DMSO,Acetone,etc.
660.381ºC at 760 mmHg
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Comparisons of the 10 most frequently evaluated test strategies showed that a combined NT, PAPP‐A, free ßhCG and maternal age test strategy significantly outperformed ultrasound markers alone (with or without maternal age) except nasal bone, detecting about nine out of every 10 Down’s syndrome pregnancies at a 5% false positive rate (FPR). In both direct and indirect comparisons, the combined NT, PAPP‐A, free ßhCG and maternal age test strategy showed superior diagnostic accuracy to an NT and maternal age test strategy (P < 0.0001). Based on the indirect comparison of all available studies for the two tests, the sensitivity (95% confidence interval) estimated at a 5% FPR for the combined NT, PAPP‐A, free ßhCG and maternal age test strategy (69 studies; 1,173,853 fetuses including 6010 with Down's syndrome) was 87% (86 to 89) and for the NT and maternal age test strategy (50 studies; 530,874 fetuses including 2701 Down's syndrome pregnancies) was 71% (66 to 75). Combinations of NT with other ultrasound markers, PAPP‐A and free ßhCG were evaluated in one or two studies and showed sensitivities of more than 90% and specificities of more than 95%.
Two genera of Aulacoscelinae beetles reflexively bleed azoxyglycosides found in their host cycads
Alberto Prado 1, Julieta Ledezma, Luis Cubilla-Rios, Jacqueline C Bede, Donald M Windsor
Six compounds were isolated from Rhizoma Heterosmilacis Japonicae. They were identified as beta-sitosterol (I) dau-costerol (II),3,3′,5,5′-tetrahydroxy-4′-methoxystilbene (III), naringenin (IV), alpha-L-butylsorbopyranoside (V) and macrozamin (VI). The compounds III, IV, V and VI were isolated from this genus for the first time.
[Studies on chemical constituents from Rhizoma Heterosmilacis Japonicae]
Lei Qiao 1, Jiu-zhi Yuan, Hai-yan Cheng, Xiao-hui Chen, Kai-shun Bi
Objective: To develop a RP-HPLC method for the determination of the content of macrozamin in Rhizoma Heterosmilacis Japonicae.
Method: A Century C18 AQ column (4.6 mm x 250 mm, 5 microm) was used with the mobile phase consisted of water (4:96). The flow rate was 1.0 mL x min(-1). The detection wavelength was set at 215 nm, and the column temperature was 35 degrees C.
Result: The calibration curve was linear (r = 0.999 8) in the range of 19.12 – 382.4 microg x mL(-1) for macrozamin, the average recovery of the method was 99.5%, with RSD 2.1% (n = 9).
Conclusion: This method can be used for the quality study of Rhizoma Heterosmilacis Japonicae.
[Determination of macrozamin in Rhizoma Heterosmilacis Japonicae by RP-HPLC]
Lei Qiao 1, Xiao-Hui Chen, Kai-Shun Bi