The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, China.
National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, Wuxi, China.
J Texture Stud. 2020 Aug;51(4):642-649. doi: 10.1111/jtxs.12519. Epub 2020 Mar 12.
The current study aimed to determine the rheological properties of welan gum produced by Sphingomonas sp. ATCC 31555 using different nitrogen sources. The viscosity and rheological properties of welan gum produced by Sphingomonas sp. ATCC 31555 from different ratios of inorganic, organic, and mixture of organic and inorganic nitrogen sources were measured under different conditions of pH, rotational speeds, and temperatures and also in the presence of various metal ions. Increasing the proportion of sodium nitrate (NaNO ) as the nitrogen source enhanced the viscosity and the ability of welan gum solution to resist high temperatures and salinity. The viscosity of welan gum solution derived from all three nitrogen sources gradually declined when the rotational speed was increased and stabilized at rotational speeds >30 rpm. The elastic modulus and viscous modulus were highest for a welan gum solution derived from 4.0 g/L NaNO . The viscosity, temperature, and salt tolerance were superior when a welan gum solution was produced from NaNO in comparison with that produced from organic nitrogen source.
本研究旨在确定不同氮源下 Sphingomonas sp. ATCC 31555 产生的韦兰胶的流变学特性。从不同比例的无机氮、有机氮和有机-无机氮源混合物中，测量了 Sphingomonas sp. ATCC 31555 产生的韦兰胶的粘度和流变学特性，在不同的 pH 值、转速、温度以及存在各种金属离子的条件下进行了测量。增加硝酸钠（NaNO ）作为氮源的比例可以提高韦兰胶溶液的粘度和耐高温、高盐度的能力。当转速增加时，三种氮源来源的韦兰胶溶液的粘度逐渐降低，并在转速>30rpm 时稳定下来。由 4.0g/L NaNO 生成的韦兰胶溶液的弹性模量和粘性模量最高。与从有机氮源产生的韦兰胶溶液相比，从 NaNO 产生的韦兰胶溶液具有更好的粘度、温度和耐盐性。
