Membrane bioreactors glucose

A liquid membrane bioreactor was developed as a means of encapsulation for a multi-enzyme system incorporating an oxidation and carbohydrate cleavage, demonstrated using a-glucosidase and glucose oxidase in the conversion of maltose to gluconic acid ... 

The production of substances that preserve the food from contamination or from oxidation is another important field of membrane bioreactor. For example, the production of high amounts of propionic acid, commonly used as antifungal substance, was carried out by a continuous stirred-tank reactor associated with ultrafiltration cell recycle and a nanofiltration membrane [51] or the production of gluconic acid by the use of glucose oxidase in a bioreactor using P E S membranes [52]. Lactic acid is widely used as an acidulant, flavor additive, and preservative in the food, pharmaceutical, leather, and textile industries. As an intermediate product in mammalian metabolism, L( +) lactic acid is more important in the food industry than the D(—) isomer. The performance of an improved fermentation system, that is, a membrane cell-recycle bioreactors MCRB was studied [53, 54], the maximum productivity of 31.5 g/Lh was recorded, 10 times greater than the counterpart of the batch-fed fermentation [54]. 

ATCC53488 2MNa2C03 Glucose Continuous (membrane-bioreactor-electrodialysis) complex (yeast extract and peptone) CO2 sparging 83 1.35 10.4 [31]... 

The reactor feed contained glucose and ammonium chloride as the sources of organic carbon and nitrogeneous component. In addition, the feed contained a small amount of minerals as element nutrition. The experimental membrane bioreactor contained 16 carbon tubes of length 20 cm with inner and outer diameter of 4.7 and 8.9 mm, respectively. The pore size was 2 pm. To enhance the bacterial attachment the shell side surface of the carbon membrane was covered with nonwoven material,... 

Figure 20 shows a schematic of a novel membrane-integrated process for citric acid production from glucose syrups by Yarrowia lypolitica ATCC 20346, based on prolonged fed-batch fermentation carried out in a stirred bioreactor coupled to a MF unit equipped with tubular ceramic membranes, and disodium citrate recovery from MF permeates by ED (Moresi, 1995). 

Godjevaigova T, Dayal R, Turmanova S (2004) Gluconic add production in bioreactor with immobilized glucose oxidase plus catalase on polymer membrane adjacent to anion-exchange membrane. Macromol Biosci 4 950-956... 

In the laboratory, the cultivation is conducted in a liquid Hestrin-Schramm medium (glucose, yeast extract, peptone, citric acid and sodium phosphate) at pH 5 and 28°C. The cultures are grown in static containers or air flow (airlift bioreactors). The growing time depends on the desired thickness of the ensuing cellulose membrane. Several studies can be found on the growth kinetics of those microorganisms, based on fermentative processes [5]. 

Similarly, Oh and colleagues (Oh et al., 2004) report about the application of a membrane unit—outside of the reaction volume— for the production of H2 out of glucose fermentation. Analogous to the previous research, the reactor productivity increases with respect to a plain bioreactor (without the membrane unit) as long as the membrane fouling could be under control (the flux is backpulsed to reduce the membrane fouling). 

A bioreactor in which living yeast cells are sandwiched between a cellulose acetate ultrafiltration membrane and a cellulose acetate reverse osmosis membrane (Figure 9.1) was proposed [280], [281]. A solution containing glucose substrate and nutrients is in contact with the ultrahltration (UP) membrane, and pressure is applied on the substrate solution. The substrate permeates the UF membrane freely, together with solvent (water), and arrives at the cell layer where the bioreaction starts to occur, leading to the ethanol product. When the solution is forced by pressure out of the cell layer from the side that is in contact... 

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