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The terahertz absorption spectrum of orotic acid monohydrate in the crystalline phase was experimentally obtained by using THz time-domain spectroscopy and numerically simulated by using density functional theory. In addition, the feature, which was located at 110. 2 cm -1, was due to the chemical interactions between orotic acid and water molecules. These results show that THz spectroscopy can be used to monitor molecular dehydration during industrial production.
With acetic, maleic, and succinic acids anhydrides, Rapeseed straw was modified. Such a change changes the straw surface leading to the exposition of the wood tissue skeleton. Esterification of repeseed straw by organic acid anhydrides resulted in chemical changes in the product's chemical structure. Modifiers with the three anhydrides of organic acids used as modifiers, according to the degree of straw modification, determined by the weight percent gain index. The starting temperatures of active thermolysis for the straw treated with maleic and succinic acid anhydrides were lower than those for native straw, but for the straw treated with acetic acid was higher. By electron paramagnetic resonance spectroscopy, concentrations of free radicals in rapeseed straw samples was determined. With maleic anhydride, the highest amount of radicals for rapeseed straw was discovered.
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