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首页> 外文期刊>The Journal of Chemical Physics >Identification of the slower secondary relaxation's nature in maltoseby means of theoretical and dielectric studies
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Identification of the slower secondary relaxation's nature in maltoseby means of theoretical and dielectric studies

机译：通过理论和介电研究鉴定麦芽糖中较慢的二次弛豫性质

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Dielectric relaxation measurements on maltose were performed at ambient and increasing pressure.The loss spectra collected below glass transition of this disaccharide revealed presence of two wellseparated secondary relaxations. Activation energies determined for both modes are Ea=73kJ / mol and 47 kJ/mol for the slower(β)and faster (γ) relaxation, respectively. From highpressure measurements activation volume Δ V=15.6 ml/ mol for the slower secondary relaxationwas estimated. Both quantities: activation energy and activation volume for α-process derived fromdielectric data, were compared to those obtained from the conformational calculations with use ofdensity functional theory (DFT). We found out satisfactory agreement between both quantities forthe molecular motion related to the rotation of the two monosaccharide units around glycosidiclinkage in this disaccharide.
机译：在环境压力和升高的压力下对麦芽糖进行介电弛豫测量。在该二糖的玻璃化转变以下收集的损耗光谱显示存在两个良好分离的二次弛豫。对于较慢的（β）和较快的（γ）弛豫，两种模式下确定的活化能分别为Ea = 73kJ / mol和47kJ / mol。从高压测量中，估计较慢的二次松弛的活化体积ΔV＝ 15.6ml / mol。将从介电数据得出的α过程的活化能和活化量这两个量与使用密度泛函理论（DFT）从构象计算中获得的量进行比较。我们发现分子运动的两个量之间令人满意的一致性，该运动与该二糖中糖苷键周围两个单糖单元的旋转有关。

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