Gas chromatography/inductively coupled plasma mass spectrometry (GC/ICP-MS) coupled with solid phase micro-extraction can provide a simple, extremely selective and sensitive technique for the analysis of volatile sulf...Gas chromatography/inductively coupled plasma mass spectrometry (GC/ICP-MS) coupled with solid phase micro-extraction can provide a simple, extremely selective and sensitive technique for the analysis of volatile sulfur and selenium compounds in the headspace of growing plants. In this work, the technique was used to evaluate the volatilization of selenium in wild-type and genetically-modified Brassica juncea seedlings. By converting toxic inorganic selenium in the soil to less toxic, volatile organic selenium, B. juncea might be useful in bioremediation of selenium contaminated soil.展开更多
文摘Gas chromatography/inductively coupled plasma mass spectrometry (GC/ICP-MS) coupled with solid phase micro-extraction can provide a simple, extremely selective and sensitive technique for the analysis of volatile sulfur and selenium compounds in the headspace of growing plants. In this work, the technique was used to evaluate the volatilization of selenium in wild-type and genetically-modified Brassica juncea seedlings. By converting toxic inorganic selenium in the soil to less toxic, volatile organic selenium, B. juncea might be useful in bioremediation of selenium contaminated soil.
文摘该文测定了沙棘果油中脂肪酸与8种微量元素。沙棘果油由亚临界流体萃取而得,经脂肪皂化和脂肪酸甲酯化,气相色谱-质谱联用法测定脂肪酸,内标法定量;在浓HNO 3中经微波消解,电感耦合等离子体原子发射光谱法测定微量元素,外标法定量。共检测到19种脂肪酸,其中饱和脂肪酸、单不饱和脂肪酸、多不饱和脂肪酸百分比含量分别为24.42%、47.26%和28.31%,C16∶0、C16∶1、C18∶1、C18∶2、C18∶3含量较高,分别为39.71、44.29、48.15、35.25和35.25 mg/g。试样中K、Na、Ca、Mg、Cu、Zn、Fe和Mn的检测限分别为0.5、0.25、0.125、0.1、0.1、0.1、0.2和0.4μg/g,各元素的平均回收率为85.0%~94.4%,相对标准偏差(relative standard deviation,RSD)为3.28%~9.23%(RSD<10%)。沙棘果油中Na、Ca、K、Mg、Fe、Zn含量较高,分别为149.28、65.29、41.08、21.27、14.43和4.71μg/g。沙棘果油中不饱和脂肪酸与人体所需微量元素含量较高,具有很高的营养价值,该研究结果为沙棘的进一步开发利用提供了基础数据。
