室内空气颗粒物成分及来源分析

应用扫描电镜-X射线能谱对株洲市某办公建筑内空气颗粒污染物进行定性分析,在室内颗粒物中一共发现C、O、Si、Al等13种元素,绝大部分样本中含有K、Ca等元素推断其中含有铝硅酸盐。C、O、Si、Al含量高说明室内空气颗粒物以煤炭燃烧后形成的烟尘聚合物、煤灰颗粒以及土壤细小微粒为主。颗粒物表面呈不规则形状且互相吸附,聚合成较大的微粒团。

HPLC测定不同来源决明子饮片中9个成分的含量

目的:建立高效液相色谱法测定决明子饮片中红镰霉素龙胆二糖苷、决明子苷、橙黄决明素葡萄糖苷3个苷类成分和橙黄决明素、黄决明素、决明素、大黄素、大黄酚、大黄素甲醚6个苷元的含量。方法:采用Agilent ZORBAX SB-C18色谱柱(4.6mm×250 mm,5μm)色谱柱,流速为1.0 mL·min-1,柱温为室温。流动相Ⅰ为乙腈-四氢呋喃-1%冰醋酸水溶液(18∶3∶79),检测波长为278 nm;流动相Ⅱ为乙腈-0.1%磷酸水溶液,梯度洗脱,检测波长为284 nm,分别测定苷和苷元类成分的含量。结果:红镰霉素龙胆二糖苷、决明子苷、橙黄决明素葡萄糖苷、橙黄决明素、黄决明素、决明素、大黄素、大黄酚、大黄素甲醚的进样量分别在0.051～2.0、0.054～2.1、0.020～0.78、0.050～0.50、0.018～0.18、0.015～0.15、0.013～0.13、0.085～0.85、0.026～0.26μg范围内与色谱峰面积呈良好的线性关系;加样回收率(n=6)在97.6%～101.6%,RSD在1.4%～2.4%。不同来源的决明子饮片中9个成分的含量差异显著。结论:本方法为决明子饮片的全面质量控制提供了参考。

Characterization and Chemometrics Based-Approach to Classify Some Algerian Blossom Honeys

Physicochemical characterization of 82 Algerian honeys, collected between 2005 and 2010, from different botanical and geographical origins were analyzed. The studied parameters were： water content, pH, free acidity （FA）, electrical conductivity （EC）, ash content, hydroxymethylfurfuraldehyde （HMF）, proline content, specific rotatory power and color. Most of the measured parameters had showed values in the range of the international standards, with a particular richness in proline and ash content. Chemometrics-based approach reveals that the discriminated groups were Citrus, Ziziphus and forest even with over represented groups like Eucalyptus. Principle component analysis （PCA） enabled to extract three principal components explaining nearly 65% of total variance, PCj and PC2 were related to botanical origin whereas PC3 to honey age. Analysis of variance showed that the studied variables were almost different depending on botanical, geographical origin and season. The current study also shows the presence of diverse honey varieties in Algeria. The collected data will contribute to the creation of products with protected geographical or/and botanical origins.