Studies on the thermal decomposition of commercial raw plant materials used in medicine were performed. 144 independent samples
of plant materials — herbs, leaves,flowers, inflorescences, fruits, roots, rhizomes and barks, collected by Medicinal Plant
Works‘Herbapol’, were analyzed. Thermal decomposition was performed using OD-103 Derivatograph. As a result of analysis, it
was established, that thermal decomposition of majority of samples proceeds through three stages. The analysis of fruits revealed,
that their thermal decomposition proceeds in four stages. In order to obtain a more clear classification of the analyzed plant
materials principal component analysis (PCA) was applied. Interpretation of the PCA results allows to state, that samples
of raw materials from the same plant species in majority of cases are characterized by similar course of thermal decomposition
due to similar chemical composition. In this way the differences in general chemical composition of medicinal
plants raw materials can be determined.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
Summary: The influence of surface morphologies on the properties of materials is of essential importance and is therefore a widely discussed topic. In the present contribution, the properties of a set of diblock copoly(2‐oxazoline)s are analyzed in terms of their individual morphologies, which have been investigated with tapping‐mode SFM. This collection of diblock copolymers consists of 12 diblock copolymers and four corresponding homopolymers, representing a complete 16‐membered library of (co‐) poly(2‐oxazoline)s, composed of four differently substituted 2‐oxazoline monomers. For the investigated set of compounds, a correlation between the morphologies of the spin‐coated films and their surface energies could be determined.
Morphologies of spin‐coated films of a library of diblock copoly(2‐oxazoline)s and their correlation to the corresponding surface energies. 相似文献