Optimization of culture medium compositions for gellan gum production by a halobacterium Sphingomonas paucimobilis

Zhang, Jun; Dong, Yuchen; Fan, Lei; Jiao, Zhihua; Chen, Qihe

doi:10.1016/j.carbpol.2014.09.029

Cited by 52 publications

(22 citation statements)

References 31 publications

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“…All the experiments were performed in triplicate. The test factors were coded according to the following equation (Zhang, Dong, Fan, Jiao, & Chen, ):

x_{i} = \frac{X_{i} - X_{0}}{Δ X_{i}}

…”

Section: Methodsmentioning

confidence: 99%

Production and characterization of a new glycolipid, mannosylerythritol lipid, from waste cooking oil biotransformation by Pseudozyma aphidis ZJUDM34

Niu

Wang

et al. 2019

Food Science & Nutrition

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Mannosylerythritol lipids (MELs) are glycolipids possessing unique biosurfactant properties. However, the prices of substrates currently used for MEL formation caused its unsustainable commercial development. Waste cooking oil poses significant ecological and economical problems. Thus, the production of MELs from used waste cooking oil using the biotransformation route is one of the better alternatives to utilize it efficiently and economically. This work aims at the production of MELs using waste cooking oil instead of soybean oil and evaluating the major characteristics and compositions of MELs. The titers reached 61.50 g/L by the optimization of culture medium, higher than the counterpart (10.25 ± 0.32 g/L) of the nonoptimized medium. MELs exhibited good surface activity and better performance in contrast to MELs grown on soybean oil. The water phase behavior of MEL‐A was also evaluated. The process showed higher productivity of MELs with better surface activity and application stability than the conventional process using soybean oil. The findings of this study imply that the use of inexpensive fermentation substrates associated with straightforward downstream processing is expected to have a great impact on the economy of MEL production.

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“…All the experiments were performed in triplicate. The test factors were coded according to the following equation (Zhang, Dong, Fan, Jiao, & Chen, ):

x_{i} = \frac{X_{i} - X_{0}}{Δ X_{i}}

…”

Section: Methodsmentioning

confidence: 99%

Production and characterization of a new glycolipid, mannosylerythritol lipid, from waste cooking oil biotransformation by Pseudozyma aphidis ZJUDM34

Niu

Wang

et al. 2019

Food Science & Nutrition

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“…It seems that EPS producing-bacteria play a significant role in the formation of aerobic granules (Zhu et al, 2015). In this sense, genera of EPS producingbacteria were found in both aerobic granules at low salinity (Sphingobium; (Zhang et al, 2011)) and high salinity (Sphingomonas; (Zhang et al, 2015)). In the case of the aerobic granules at high salinity, the most abundant genus was Devosia (46 % of the reads).…”

Section: Impact Of Salinity On Microbial Populationmentioning

confidence: 99%

Long-term impact of salinity on the performance and microbial population of an aerobic granular reactor treating a high-strength aromatic wastewater

Ramos

Suárez-Ojeda

Carrera

2015

Bioresource Technology

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The effect of salinity over granular biomass treating a mixture of aromatic compounds (phenol, o-cresol and p-nitrophenol) was evaluated in a continuous airlift reactor. To mimic an industrial wastewater, increasing concentrations (from 2.0 to 29.0 g salts L(-1)) of a mixture of salts (MgSO4, NaCl, KCl, CaCl2 and NaHCO3) were introduced in the influent. The gradual salinity increase led to a good acclimation of the biomass obtaining complete biodegradation of the aromatic compounds and no accumulation of metabolic intermediates. However, a deterioration of the morphology of aerobic granules with a complete loss of granulation after 125 days was produced at 29.0 g salts L(-1). At that moment, anaerobic granules were added to promote granulation and after 50 days new aerobic granules were formed. These new aerobic granules remained stable for more than 100 days at the highest salinity condition with 100% removal of the mixture of aromatic compounds.

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“…The validation by our experiment, performed under optimized nutrient levels, and experimental lactic acid production, was found to be 102 g/L (%), suggesting that the experimental and predicted values were in good agreement. The statistical experimental design has been successfully utilized in medium optimization for the microbial fermentation process in recent decades [34][35][36]. Even the optimization was successfully achieved by helpful experimental designs, but the production medium and the expensive organic nitrogen sources, such as beef extract, peptone, and yeast extract, were replaced by CSL, but the optimized production medium is based on the MRS medium, and is still composed of other mineral salts such as K 2 HPO 4 , CH 3 COONa, and MnSO 4 , which might be cost-effective substrates if fermentation is performed on a larger scale.…”

Section: Discussionmentioning

confidence: 99%

Simultaneous Bioconversion of Gelatinized Starchy Waste from the Rice Noodle Manufacturing Process to Lactic Acid and Maltose-Forming α-Amylase by Lactobacillus plantarum S21, Using a Low-Cost Medium

et al. 2019

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A direct bioconversion of gelatinized starchy waste (GSW) to lactic acid by amylolytic lactic acid bacterium Lactobacillus plantarum S21 was investigated. Corn steep liquor (CSL) was selected as the most suitable low-cost nitrogen source for replacing yeast extract, beef extract, and peptone in De Man, Rogosa and Sharpe (MRS) medium. Plackett–Burman design results indicated that GSW and CSL were the two most nutrients that significantly influence lactic acid production, among eight medium components, including GSW, CSL, K2HPO4, CH3COONa, (NH4)2HC6H5O7, MgSO4, MnSO4, and Tween 80. A new low-cost medium containing only GSW (134.4 g/L) and CSL (187.7 g/L) was achieved as omitting other six components from the optimized medium had no effect on lactic acid yield. Batch fermentation at 37 °C both in 1 L and 10 L jar fermenters showed non-significantly different productivity. A by-product, maltose-forming α-amylase, was successfully achieved up to 96% recovery yield using an ultrafiltration unit equipped with a 50 kDa cut-off membrane. Crude lactic acid exhibited the additional benefit of antimicrobial activity against food and feed pathogens Salmonella enterica serovar Typhimurium TISTR 292, Vibrio cholerae TH-001, and also E. coli ATCC 25922. This study presents a promising bioprocess for the simultaneous production of lactic acid, and a value-added food enzyme, using only two industrial wastes, GSW and CSL, as the medium components.

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Optimization of culture medium compositions for gellan gum production by a halobacterium Sphingomonas paucimobilis

Cited by 52 publications

References 31 publications

Production and characterization of a new glycolipid, mannosylerythritol lipid, from waste cooking oil biotransformation by Pseudozyma aphidis ZJUDM34

Production and characterization of a new glycolipid, mannosylerythritol lipid, from waste cooking oil biotransformation by Pseudozyma aphidis ZJUDM34

Long-term impact of salinity on the performance and microbial population of an aerobic granular reactor treating a high-strength aromatic wastewater

Simultaneous Bioconversion of Gelatinized Starchy Waste from the Rice Noodle Manufacturing Process to Lactic Acid and Maltose-Forming α-Amylase by Lactobacillus plantarum S21, Using a Low-Cost Medium

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