title: [Analysis of mineral elements in different organs at different harvesting times of Schizonepeta tenuifolia on ICP-AES].
abstract: To study the main storage organ of each mineral element in Schizonepeta tenuifolia, and explain its reasonable harvesting time and medicinal parts in view of mineral elements. The mineral elements of Schizonepeta tenuifolia in different organs at different harvesting times were determined by ICP-AES technique. The mineral elements, K, Ca, Na, P, Mg, Mn, Zn, Cu, Fe, Mo, were determined in the study. The results showed that at different harvesting times, (1) the contents of K, P, Cu in fringe and the contents of Mg, Ca, Na, Fe, Mn, Zn in leaf were highest among different organs. (2) among the macroelements, the contents of K and Ca were highest while the content of Na was lowest; among the microelements, the content of Fe was highest while the content of Mo was lowest. (3) in item, the proportion of K:P was highest while the proportion of Zn: Cu was lowest; in fringe, the proportions of Ca:Mg and Fe:Mn were lowest. (4) within the harvest period, variations of the mineral elements were not obvious.
  
  
  CONCLUSIONS
  In the stem of Schizonepeta tenuifolia, the contents of every mineral elements were lower than other organs, including leaves and spikes. Considering the mineral elements, the correlations of harvesting time and content change were not remarkable.
authors.forename: Ming-Qiu
authors.initials: MQ
authors.lastname: Shan
authors.forename: Sheng
authors.initials: S
authors.lastname: Yu
authors.forename: Li-Xia
authors.initials: LX
authors.lastname: Yu
authors.forename: An-Wei
authors.initials: AW
authors.lastname: Ding
mesh_terms: D019686:Lamiaceae / Q000737:chemistry*; D008903:Minerals / Q000032:analysis*; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D013054:Spectrophotometry, Atomic
chemical_list: D008903:Minerals