The gum asafoetida, an oleo-gum-resin from root of Ferula assa foetida, was extracted through alcoholic procedure followed by water extraction and then biochemically characterized using colorimetric assays, Fourier infrared spectroscopy, gas chromatography coupled to mass spectrometry, and 1D and 2D nuclear magnetic resonance. The gum was mainly composed of carbohydrates (67.39% w/w) with a monosaccharide distribution of 11.5: 5.9: 2.3: 1 between Gal, Ara, Rha and GlcA (molar ratio) and proteins (arabinogalactan protein). The polysaccharide consisted of a (1 → 3)-β-d-galactan backbone ramified predominantly from O-6 but also from O-4 and O-4,6. Side chains included terminal-α-l-Araf, terminal-α-l-Rhap, (1 → 3)-α-l-Araf, (1 → 5)-α-l-Araf, terminal-β-d-Galp, β-d-GlcA and traces of (1 → 4)-β-d-GlcA. X-ray diffraction pattern showed a semi crystalline microstructure. Thermal behavior of the gum was evaluated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) revealed temperatures below and upper 200 °C as dominant regions of weight loss.

中文翻译：

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从Ferula assa foetida L提取的口香糖的结构表征和热行为。

通过酒精方法提取沙枣胶（一种来自口香菜的根的口香糖树脂），然后用水萃取，然后使用比色测定，傅立叶红外光谱，气相色谱-质谱联用以及一维和二维核素进行生化表征磁共振。口香糖主要由碳水化合物（67.39％w / w）组成，在Gal，Ara，Rha和GlcA（摩尔比）和蛋白质（阿拉伯半乳聚糖蛋白质）之间的单糖分布为11.5：5.9：2.3：1。多糖由（1→3）-β -d-半乳聚糖主链组成，该主链主要由O -6分支，也由O -4和O -4,6分支。侧链包括末端-α -l-Araf，末端-α -l-Rha p，（1→3）-α -l-Ara f，（1→5）-α -l-Ara f，末端-β -d-Gal p，β - d- GlcA和（1→4）-β -d-GlcA的痕迹。X射线衍射图显示出半结晶的微观结构。胶的热行为通过热重分析（TGA）和差示扫描量热法（DSC）进行评估，结果表明，低于200°C和高于200°C的温度是减肥的主要区域。