scholarly journals Simultaneous lithium bioleaching and bioaccumulation from lepidolite using microscopic fungus Aspergillus niger

2020 ◽  
Vol 19 (2) ◽  
pp. 175-182
Author(s):  
Renáta Marcinčáková ◽  
Alena Luptáková ◽  
Marek Vojtko ◽  
Martin Fujda ◽  
Jana Sedláková-Kaduková
Keyword(s):  
Citric Acid ◽  
Aspergillus Niger ◽  
Filamentous Fungus ◽  
Glucose Concentration ◽  
Fungal Biomass ◽  
Hard Rock ◽  
Silicate Phase ◽  
Microscopic Fungus ◽  
Sem Analyses

The leaching of lithium from lepidolite using the filamentous fungus Aspergilluss niger was examined. Two mechanisms were suggested – biochemical using citric acid as the main bioleaching agent and biomechanical through hyphae penetration confirmed by XRD and SEM analyses. The bioleaching processes were conducted at various glucose concentrations (5 – 20 g.L-1). The higher glucose concentration was, the higher Li bioleaching was observed. Li accumulation by fungal biomass played an important role in Li solubilisation from lepidolite. Totally, 11.5 mg of lithium were recovered from 1 kg of lepidolite by combination of bioleaching and bioaccumulation processes. As a result of bioleaching, the formation of new silicate phase of SiO2 was detected. According to the results, fungal bioleaching of Li from lepidolite can be a perspective way of Li recovery from hard-rock ores.

scholarly journals Biologically Active Substances of Fungus Aspergillus Niger

2020 ◽  
Author(s):  
A.B. Zhursinali ◽  
A.A. Kurmanbaev
Keyword(s):  
Citric Acid ◽  
Aspergillus Niger ◽  
Filamentous Fungus ◽  
Biologically Active Substances ◽  
Biologically Active ◽  
Industrial Biotechnology ◽  
Citrus Fruits ◽  
Biotechnological Production ◽  
Diverse Range ◽  
Active Substances

The filamentous fungus Aspergillus niger is frequently used for industrial production of fermentative products such as enzymes, proteins and biochemicals. In contrast to what most people might think, citric acid is not or not anymore isolated from citrus fruits, but is industrially produced by the filamentous fungus Aspergillus niger. In 1917, a food chemist named James Currie made a promising discovery: any strain of the filamentous fungus Aspergillus niger would produce high concentrations of citric acid when grown in sugar medium. This tricarboxylic acid, which we now know is an intermediate of the Krebs cycle, had previously been extracted from citrus fruits for applications in food and beverage production. Two years after Currie’s discovery, industrial-level production using Aspergillus niger began, the biochemical fermentation industry started to flourish, and industrial biotechnology was born. Aspergillus niger additionally producing a diverse range of proteins, enzymes and secondary metabolites. In this review, we presented materials on more than 100 years of use of Aspergillus niger in biotechnological production of biologically active substances and environmental protection.

Studi Kinetika Konsumsi Glukosa oleh Aspergillus Niger dalam Produksi Bioethanol dari Lignoselulosa

2017 ◽  
Vol 4 (1) ◽  
pp. 14
Author(s):  
Setyo Erna Widiyanti
Keyword(s):  
Growth Rate ◽  
Citric Acid ◽  
Aspergillus Niger ◽  
Kinetic Parameters ◽  
Glucose Concentration ◽  
Raw Materials ◽  
Glucose Consumption ◽  
Product Formation ◽  
Initial Glucose Concentration ◽  
Kinetics Of

Global warming resulted from CO2 level increase in the atmosphere has caused elevation of earth temperature and uncertain climate changes. To prevent the rise of CO2 in the atmosphere can be done by using biomass fuel such as bioethanol. The raw materials of bioethanol can be derived from oil palm empty fruit bunch. Enzymatic hydrolysis utilizes cellulase-producing fungus and in this research, Aspergillus niger was chosen. The glucose produced is consumed by A niger as carbon source and this is undesirable, therefore it should be minimized as low as possible. Knowing the rate of glucose consumption is important to have a model of the hydrolysis reaction rate which will be helpful in the design process on an industrial scale hydrolysis reactor. This study aimed to determine the equations that can be used to approximate the growth rate of A. niger, glucose consumption, the formation of citric acid, and the kinetic parameters used to modeling the kinetics of glucose consumption by A. niger. Kinetics of glucose consumption by A. niger was studied in batch system with variation of initial glucose concentration of 30, 50, 70 g/l. The growth rate of A. niger, glucose consumption, and the formation of citric acid were modeled using 3 equations; i.e. Monod with non-competitive product inhibition, Luedeking-Piret, and Luedeking-Piret growth associated product formation, respectively. The values of kinetic parameters such as μmax, Ks, Kp, were 0.65 hour-1, 157.5 g/l, 0.3 g/l, for initial glucose concentration of 30, 50, 70 g/l, respectively. The values of α (kinetic parameter for growth associated product formation and α would be equal to Yp/x) and Yx/s were 0.4903, 0.8531, 0.9863; 0.5124, 0.2704, 0.2381, for initial glucose concentration of 30, 50, 70 g/l, respectively. Higher initial glucose concentration would increase α but it lowered Yx/s.

scholarly journals The Effect of Lipids on Citric Acid Production by an Aspergillus niger Mutant

1963 ◽  
Vol 30 (3) ◽  
pp. 365-379 ◽  
Author(s):  
N. F. MILLIS ◽  
B. H. TRUMPY ◽  
B. M. PALMER
Keyword(s):  
Citric Acid ◽  
Aspergillus Niger ◽  
Acid Production ◽  
Citric Acid Production
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