化工儀器網(wǎng)
資料下載
Properties of aqueous solutions of lentinan in the absence andpresence of zwitterionic surfactants
閱讀：274 發(fā)布時間：2015-2-6| 提 供 商 | 美國布魯克海文儀器公司 | 資料大小 | 1.4MB |
|---|---|---|---|
| 資料圖片 | 下載次數(shù) | 205次 | |
| 資料類型 | PDF 文件 | 瀏覽次數(shù) | 274次 |
| 免費下載 | 點擊下載 |
Morphological and conformational transitions of lentinan (LT), a ˇ-glucan extracted from Shiitake mush-rooms (Lentinula edodes), were investigated at different concentrations of aqueous NaOH, using SmallAngle X-ray Scattering (SAXS) technique. At low NaOH(aq)concentration LT chains are self-associatedand adopt the triple helix form where as at higher NaOH concentrations the polymer chains undergo atransition to random coil chains. Also, the presence of fractal dimensions was observed through analysisof the exponential decay of the scattering intensity as a function of the scattering angle. In addition, thelateral radius of gyration was determined for LT in different concentrations of NaOH solution, indicating arigid triple helix present as a small rod-like structure. Interactions of LT with two zwitterionic surfactantswere investigated by surface tension, fluorescence, and static light scattering measurements. Experimen-tal data showed that the formation of LT–(surfactant) complexes occurred through a cooperative process.