Determination of platycodin in Platycodi Radix from different habitats Determination of eight active components in Xuanmai Ganjie Granules by UPLC-MS/MS Purification of platycodins from Platycodonis Radix by macroporous resin Migration study on ceramic membrane separation process of active ingredient population in compound Chinese materia medica Dynamic research of density on platycodon grandiflorum dry material accumulation and platycodin D content in Platycodon grandiflorum