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 speed, and temperature and also in the presence of various metal ions. Increasing the proportion of sodium nitrate (NaNO3 ) as the nitrogen source enhanced the viscosity and the ability of welan gum solution to resisthigh 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-1 NaNO3 . The viscosity, temperature, and salt tolerance were superior when a welan gum solution was produced from NaNO3 in comparison with from organic nitrogen source. This article is protected by copyright. All rights reserved.

中文翻译：

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不同氮源对鞘氨醇单胞菌生产威兰胶黏度和流变特性的影响 空中交通管制中心 31555

目前的研究旨在确定鞘氨醇单胞菌产生的威兰胶的流变特性。ATCC 31555 使用不同的氮源。鞘氨醇单胞菌生产的威兰胶的粘度和流变特性。ATCC 31555 来自不同比例的无机、有机以及有机和无机氮源的混合物，在不同的 pH 值、转速和温度以及存在各种金属离子的情况下进行了测量。增加硝酸钠(NaNO3)作为氮源的比例，提高了威兰胶溶液的粘度和耐高温、耐盐碱的能力。当转速增加并稳定在>30 rpm 时，来自所有三种氮源的威兰胶溶液的粘度逐渐下降。来自 4.0 g·L-1 NaNO3 的威兰胶溶液的弹性模量和粘性模量最高。与有机氮源相比，NaNO3 制备的威兰胶溶液的粘度、温度和耐盐性均更好。本文受版权保护。版权所有。