[Objective] This study was conducted to explain the mechanism of the accumulation characteristics of mineral elements in alpine grassland plants. [Method] Cultivated alpine grassland plant, Poa crymophila, was treated...
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[Objective] This study was conducted to explain the mechanism of the accumulation characteristics of mineral elements in alpine grassland plants. [Method] Cultivated alpine grassland plant, Poa crymophila, was treated with drought and wa- ter stress, and then the samples were collected and analyzed. [Result] Compared with the control group, under drought and water stress, multiple mineral elements tended to accumulate and increase, and there were significant differences in the contents of Cu, Mn, Ni and P (P〈0.05). [Conclusion] Under drought and water stress, mineral elements in potted Poa crymophila tended to accumulate and in- crease, which is the adaption and response of Poa crymophila to drought and water stress, as well as the re-verification of the starvation effect hypothesis of mineral effects. The starvation effect of mineral elements is one of the endogenic forces for the accumulation and differentiation of mineral elements in grassland plants.
建立一种有效测定牦牛皮胶与牛皮明胶中18种氨基酸含量的异硫氰酸苯酯(PITC)柱前衍生-高效液相色谱法。对PITC衍生方法进行了优化,方法无需干燥和有机溶剂萃取过量PITC的步骤。牦牛皮使用胃蛋白酶在37℃下酶解72 h,酶解物冷冻干燥保存。样品用6.0 mol/L盐酸,110℃水解后,以PITC为衍生试剂进行衍生处理。采用Shiseido Capcell Pak C18(4.6 mm×250 mm,5μm)色谱柱,流动相为0.14 mol/L乙酸钠-0.5 m L/L三乙胺水溶液(p H 6.08)和60%乙腈,梯度洗脱,流速为1 m L/min,检测波长为254 nm。18种氨基酸在0.2-80 mg/L浓度范围内与峰面积间的线性关系良好(r2≥0.999 2),检出限为0.01-0.39 mg/kg,平均回收率为78.7%-121.0%,相对标准偏差(RSD)为0.05%-12.0%。结果表明,该方法衍生化步骤简单、灵敏度高、前处理时间短,可用于牛科动物皮胶中多种氨基酸成分和含量的测定。
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