Determination of Flavonoids in Pollen Typhae(Puhuang) by HPCE and HPLC Studies on Quality Standards for Pollen Typhae(Puhuang) HPLC Determination of Two Flavonoids in Pollen Tythae (Puhuang) and Its Different Processed Products Studies on thermal stabilities of typhaneoside and isorhamnetin-3-O-neohesperidoside HPLC Fingerprint of Pollen Typhae GC-MS analysis of the fatty components of Pollen Typhae before and after being carbonized Standardization of processing method for Pollen Typhae Carbonisatus