柴达木枸杞叶汁矿质元素含量测定与分析

Analysis on the mineral elements of Goji(Lycium barbarum)leaves cultivated in Caidamu Qinghai

目的:研究青海高原特有的枸杞叶中矿质元素含量,为枸杞叶的开发利用,选择枸杞叶原料提供科学依据。方法:选择青海省海西州诺木洪农场不同生长时期(6月、8月和10月)的枸杞叶,通过慢速榨汁机榨取枸杞叶汁,分为3组,采用原子吸收分光光度法,测定枸杞叶汁中矿质元素钙、铜、锌、铁、锰、钠和钾的含量,并对测定结果进行统计分析,从而探讨不同生长时期的枸杞叶汁中矿质元素含量的差异。结果:分析结果显示,诺木洪农场种植区枸杞叶汁矿质元素含量排序依次为钙>钠>钾>铁>锰>铜>锌。其中,6月组生长期的枸杞叶汁中的钾、铁、铜和锌元素含量均显著高于8月组和10月组(P<0.05)。而8月组和10月组生长期的枸杞叶汁中的钙、锰和钠元素含量显著高于6月组(P<0.05)。结论:6月生长期的枸杞叶更有利于开发铁、铜和锌的补充剂;而10月生长期的枸杞叶中钙、钠和钾的含量较高,更有利于研发钙的补充剂和天然碱性食品。

Objectives ： To test the mineral element contents of Chinese wolfberry, Goji （Lycium barbarum） leaves cultivated in Qinghai plateau, and to provide the scientific evidence for developing the plant leaves in food or pharmaceutical utilization. Methods ： The leaf samples were collected from different growing periods, 6, 8 and 10 months, from Nuomuhong farm, Haixi prefecture of Qinghai province. The mineral element contents of calcium, copper, zinc, iron, manganese, sodium and potassium were assayed by atomic absorption spectrophotometry. The results was analyzed by statistics, in order to reveal the significance between the different growing periods. Results： The detect results showed that the mineral element contents of Goji （Lycium barbarum） leaves cultivated in Nuomuhong Farm in sequence were calcium, sodium, potassium, iron, manganese, copper and zinc. Among these, the contents of potassium, iron, copper and zinc in 6-month growing period were significantly higher than those in 8-month and 10-month growing periods （P〈0.05）, and the contents of calcium, manganese and sodium in 8-month and 10-month growing periods were significantly higher than those in 6-month growing period. Conclusion ： The results suggested that the 6-month growing period leaves should be used when the nutritional additive for iron, copper and zinc was going to be developed, and 10-month growing period leaves should be applied when the natural base-forming food was going to be explored because they contained more calcium, sodium and potassium elements.