Lotus seed starch （15%, w/w） was subjected to ultra-high pressure （UHP） at 500 MPa for 10～60 min. The effects of UHP on the structural, pasting, and thermal properties of starch were investigated using solid-stat...Lotus seed starch （15%, w/w） was subjected to ultra-high pressure （UHP） at 500 MPa for 10～60 min. The effects of UHP on the structural, pasting, and thermal properties of starch were investigated using solid-state 13C CP/MAS NMR, differential scanning calorimetry （DSC）, HPSEC-MALLS-RI, and a rapid visco analyzer. The 13C CP/MAS NMR results revealed a reduction in the relative crystallinity and peak intensity of the crystalline state with increasing the UHP time. The molecular weight of native starch was 1.433 × 107 Da, which was higher than that of the UHP-treated starch. Viscograms of UHP-treated starch revealed an increase in paste viscosity, peak time, and pasting temperature and a reduction in breakdown and setback viscosity compared to the native starch. Furthermore, the DSC results showed a reduction in gelatinization temperature and gelatinization enthalpy with increasing the UHP time.展开更多
以速冻鲜莲为原料,通过薄层色谱法确定最优流动相。采用中压制备色谱,分别研究流动相流速、莲子低聚糖上样浓度对低聚糖分离效果的影响。采用电喷雾-质谱(ESI-MS)分析各单一组分。研究结果表明,最佳分离条件是:以乙酸乙酯-无水乙醇-水-...以速冻鲜莲为原料,通过薄层色谱法确定最优流动相。采用中压制备色谱,分别研究流动相流速、莲子低聚糖上样浓度对低聚糖分离效果的影响。采用电喷雾-质谱(ESI-MS)分析各单一组分。研究结果表明,最佳分离条件是:以乙酸乙酯-无水乙醇-水-氨水(体积比为9∶11∶8∶0.9)为流动相,流速25 m L/min,上样质量浓度0.4g/m L。通过ESI-MS法检测的莲子低聚糖组分3,4,5的相对分子质量分别为342,504和666。展开更多
基金Supported by the Cooperation in Production,Study and Research of Science and Technology Major Projects of Fujian Province(2012N5004)the Natural Science Foundation of Fujian Province(2012J01081)+1 种基金the Scientific and Technological Innovation Team Support Plan of Institution of Higher Learning in Fujian Province([2012]03)the Scientific and Technological Innovation Team Support Plan of Fujian Agriculture and Forestry University(cxtd12009)
文摘Lotus seed starch （15%, w/w） was subjected to ultra-high pressure （UHP） at 500 MPa for 10～60 min. The effects of UHP on the structural, pasting, and thermal properties of starch were investigated using solid-state 13C CP/MAS NMR, differential scanning calorimetry （DSC）, HPSEC-MALLS-RI, and a rapid visco analyzer. The 13C CP/MAS NMR results revealed a reduction in the relative crystallinity and peak intensity of the crystalline state with increasing the UHP time. The molecular weight of native starch was 1.433 × 107 Da, which was higher than that of the UHP-treated starch. Viscograms of UHP-treated starch revealed an increase in paste viscosity, peak time, and pasting temperature and a reduction in breakdown and setback viscosity compared to the native starch. Furthermore, the DSC results showed a reduction in gelatinization temperature and gelatinization enthalpy with increasing the UHP time.
文摘以速冻鲜莲为原料,通过薄层色谱法确定最优流动相。采用中压制备色谱,分别研究流动相流速、莲子低聚糖上样浓度对低聚糖分离效果的影响。采用电喷雾-质谱(ESI-MS)分析各单一组分。研究结果表明,最佳分离条件是:以乙酸乙酯-无水乙醇-水-氨水(体积比为9∶11∶8∶0.9)为流动相,流速25 m L/min,上样质量浓度0.4g/m L。通过ESI-MS法检测的莲子低聚糖组分3,4,5的相对分子质量分别为342,504和666。
