一区二区三区精华液9色,国产A级毛片久久久精品毛片,99久久这里只有精品不卡,欧美禁片性船在线观看

Abstract:

Saposhnikoviae Radix (SR), one of top-grade herbs, is widely used to treat cold, headache, fevers, cough, rheumatism and cardiovascular diseases in prescriptions. A vortex-assisted matrix solid phase dispersion (VA-MSPD) extraction method applying a reusable dispersant was developed to extract four chromones and one coumarin from Saposhnikoviae Radix (SR), which followed by high performance liquid chromatography analysis (HPLC). The novel dispersant, acetonitrile modified carbon-coated magnetite nanoparticles (Fe3O4@C@ ACN MNP), could be reused for 10 times and it still possesses excellent extraction performance. Various optimal experimental condition of VA-MSPD was considered and obtained reliable matrix linearity (r2 > 0.999) and good recovery (94.8%–105%). In order to recovery the dispersant from sample-dispersant powder after elution, methanol/water (50:50, v/v) was applied as washing solution to separate the dispersant and samples, so that the percent recovery of modified materials was obtained as 88.6% (RSD = 0.74%). The results indicated that Fe3O4@C@ACN MNP could be considered as sustainable dispersant and it exhibited tremendous potential for efficacious extraction of chromones and coumarins.

…………

2. Materials and methods 

 2.1. Chemicals and reagents  

   Reference components of 4′-O-β-D-glucosyl-5-O-methylvisamminol,  prim-O-D-glucosylcimifugin, cimifugin, psoralen and sec-O-glucosylha-maudol (purity >99%) were supplied by Chengdu Desite Biotech Co.,  Ltd. (Chengdu, China).