Zhao Haibo, Xu Qiang, Yan Tianlan, Zhang Hongdong, Yang Yuliang
Institute for Preservation and Conservation of Chinese Ancient Books, Fudan University Library, Fudan University, Shanghai 200433, China.
Department of Chemistry, Fudan University, Shanghai 200433, China.
Polymers (Basel). 2023 Dec 15;15(24):4721. doi: 10.3390/polym15244721.
A combination of starch and hydrocolloids is a facile method for physically modifying native starch. Bletilla striata polysaccharide (BSP) is a glucomannan with various applications in the food and cosmetic industries as a thickening agent. This study focused on investigating the impact of BSP on the pasting, rheological and adhesive properties of wheat starch (WS). Results from a Rapid Visco-Analyzer (RVA) revealed that the addition of BSP (below 0.2%) resulted in increases in peak viscosity, breakdown and setback values. However, for the addition of BSP at a higher concentration (0.3%), the opposite trend was observed. Rheological measurements indicated that the presence of BSP increased the viscoelastic properties of WS-BSP gels. TGA results demonstrated that the presence of BSP promoted the thermal stability of starch. FTIR results indicated the short-range order structure decreased at low addition concentrations of BSP (0.05% and 0.1%) and increased with higher BSP addition concentrations (0.2% and 0.3%). SEM observation showed that the BSP improved the hydrophilic property of starch gels and decreased the size of pores in the starch gels. Further, the mechanical properties of paper samples unveiled that the present of BSP in starch gels obviously increased its bonding strength as an adhesive.
淀粉与水胶体的组合是对天然淀粉进行物理改性的简便方法。白及多糖（BSP）是一种葡甘露聚糖，在食品和化妆品行业中作为增稠剂有多种应用。本研究着重调查BSP对小麦淀粉（WS）糊化、流变学和黏附特性的影响。快速黏度分析仪（RVA）的结果显示，添加BSP（低于0.2%）会导致峰值黏度、破损值和回生值增加。然而，对于添加较高浓度（0.3%）的BSP，观察到相反的趋势。流变学测量表明，BSP的存在增加了WS-BSP凝胶的黏弹性。热重分析（TGA）结果表明，BSP的存在促进了淀粉的热稳定性。傅里叶变换红外光谱（FTIR）结果表明，在低添加浓度（0.05%和0.1%）的BSP下，短程有序结构减少，而随着BSP添加浓度升高（0.2%和0.3%）则增加。扫描电子显微镜（SEM）观察显示，BSP改善了淀粉凝胶的亲水性并减小了淀粉凝胶中的孔隙尺寸。此外，纸样的机械性能表明，淀粉凝胶中BSP的存在显著提高了其作为黏合剂的黏合强度。
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