Cloning and bioinformatic analysis of 3-hydroxy-3-methylglutaryl coenzyme-A reductase gene from Panax notoginseng Purification technology of total saponins in Panax notoginseng with macroporous resin and their quality analysis Isolation and identification of a new compound from acid hydrolysate of saponinin stems and leaves of Panax notoginseng Purification technology of total saponins in Panax notoginseng with macroporous resin and their quality analysis