Razavi Seyed Mohammad Ali, Cui Steve W, Ding Huihuang
Food Hydrocolloids Research Center, Department of Food Science and Technology, Ferdowsi University of Mashhad (FUM), PO Box: 91775-1163, Mashhad, Iran.
Guelph Food Research Center, Agriculture and Agri-Food Canada, Guelph, ON, Canada N1G 5C9.
Int J Biol Macromol. 2016 Feb;83:142-51. doi: 10.1016/j.ijbiomac.2015.11.076. Epub 2015 Dec 2.
In this study, the structural information (monosaccharide compositions, molecular weight parameters & FTIR analysis), chemical composition (moisture, protein, ash, carbohydrate & uronic acids), rheological properties, and surface activity of Lallemantia royleana seeds mucilage (BSG) were determined. The results showed BSG contains 8.51% (w.b.) moisture, 8.24% (d.b.) ash, 2.71% (d.b.) protein, 75.87% (d.b.) carbohydrate and 20.33% (d.b.) uronic acids. Monosaccharide analysis revealed the presence of arabinose (37.88%), galactose (33.54%), rhamnose (18.44%), xylose (6.02%) and glucose (4.11%) in the BSG polysaccharide. Although BSG had similar molecular weight (1.294×10(6) Da) compared to most seed gums, the intrinsic viscosity (23.06 dL/g) and gyration radius (104.84 nm) were higher. The BSG exhibited a strong shear-thinning behavior (n<0.29) over the shear rate range of 0.01 to 1000 s(-1). Flow behavior data was correlated with different time-independent models, which provided a good description of BSG rheological properties. Dynamic mechanical spectra demonstrated BSG is a typical of weak gel, which its rheological parameters were superior to those of many commercial gums. The FTIR spectra of the BSG polymer showed the presence of carboxyl groups, which may serve as binding sites for ions. BSG exhibited the ability to reduce the surface tension of water at concentrations lower than 0.75%.
在本研究中，测定了罗勒籽黏液（BSG）的结构信息（单糖组成、分子量参数及傅里叶变换红外光谱分析）、化学成分（水分、蛋白质、灰分、碳水化合物及糖醛酸）、流变学性质和表面活性。结果表明，BSG含有8.51%（湿基）水分、8.24%（干基）灰分、2.71%（干基）蛋白质、75.87%（干基）碳水化合物和20.33%（干基）糖醛酸。单糖分析显示，BSG多糖中存在阿拉伯糖（37.88%）、半乳糖（33.54%）、鼠李糖（18.44%）、木糖（6.02%）和葡萄糖（4.11%）。尽管与大多数籽胶相比，BSG的分子量（1.294×10⁶ Da）相近，但其特性黏度（23.06 dL/g）和回转半径（104.84 nm）更高。在0.01至1000 s⁻¹的剪切速率范围内，BSG表现出强烈的剪切变稀行为（n<0.29）。流动行为数据与不同的非时变模型相关，这些模型很好地描述了BSG的流变学性质。动态力学光谱表明，BSG是一种典型的弱凝胶，其流变学参数优于许多商业胶。BSG聚合物的傅里叶变换红外光谱显示存在羧基，羧基可能作为离子的结合位点。在浓度低于0.75%时，BSG表现出降低水表面张力的能力。
