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Scutellarin (Breviscapin) is Compositae fleabane (Erigeron breviscapus) extract , the main active ingredient of scutellarin (Scutellarin), that is, 4 ' , 5, 6 - trihydroxyflavone -7 - glucuronic acid glycosides . Scutellarin with the expansion of blood vessels, increase heart coronary blood flow , increase cerebral blood flow and reduce cerebral vascular resistance , increased BBB permeability and confrontation by the adenosine diphosphate -induced platelet aggregation , has been used clinically for many years. But scutellarin insoluble in water, orally bioavailable short half-life , the absolute bioavailability is low, clinical applications require large doses of multiple doses to achieve therapeutic purposes, can not maintain effective blood concentration and play a lasting therapeutic effect. Design of prodrugs used in many therapeutic areas in order to improve the pharmacological properties. This technique has been applied to the extended platform for small molecule drugs field . Erigeron polyethylene glycol currently used to improve the characteristics of the drug is connected to cause a large concern . PEG is a linear molecule , with not degrading , non-toxic , non-immunogenic , etc. are widely used in protein and small molecule drugs modification. Prodrug is designed to effectively address some of the problems of drug solubility and stability , improve bioavailability and reduced toxicity . Polyethylene glycol with a good solubility in water, non-toxic, biocompatible and non-immunogenic , and other polymers incomparable advantages , former drug synthesis and preparation plays an important role . Because of the toxic properties of PEG and good biocompatibility , PEG is approved by the FDA as a handful of energy injected synthetic polymer medicinal one . To this end , we used research method is modified with polyethylene glycol to scutellarin to increase water solubility and prolonged half-life and other characteristics to improve its own shortcomings, for which we synthesized a series of different molecular weight prodrug Dengzhanhua , and these compounds were characterized , these prodrugs physicochemical properties and biological activity being tested.
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