ABSTRACT
Objective: To prepare ginkgo flavones phospholipid complex (GF-PC) and to solidify it using colloidal silica (CS). Methods: CS was used as a carrier to solidify GF-PC. The structures of the phospholipid complex and solidified powder were also characterized by differential scanning calorimetry, X-ray diffractomer, and scanning electron microscope, and dissolution in vitro and fluidity were also investigated. Results: The phase analysis indicated that ginkgo flavones existed in the phospholipid complex and solidified powder as amorphous state. Dissolution in vitro showed that the solidified powder could effectively promote the drug dissolution. Conclusion: The process of the solidified powder is simple and convenient. The powder prepared can significantly improve the fluidity of the GF-PC and promote the dissolution in vitro.
ABSTRACT
AIM:To gain the molecular mechanism of active ingredients of EGb 761(ginkgo flavones and ginkgo lides) for the inhibition against A?_(1-42) aggregation and fibrogenesis.METHODS:Circular dichroism spectra(CD) and FI-IR were used to curve-fit and analyze the change in A?_(1-42) second structure under A? aged condition and intervention of ginkgo flavones and ginkgo lides.RESULTS:Analysis that was made of 1700-1600 m(-1) amide-Ⅰ-band and curve fitting indicated that after 30 min to 72-incubation,increase of ?-sheet in A?_(1-42) by(18.5%),but the reduction of ?-sheet by(50.95%) and(36.09%) in 72 h incubation with ginko flavones and ginkgo lides,respectively.And increase of ?-turn by(56.56%) and(46.56%) in sane condition.CONCLUSION:Obviously,?-sheet turned into ?-turn.-CH_2 and-CH groups of ketones and alkanes engaged in A?_(1-42) molecular change.