Which bacteria produce the dextran?
Which bacteria produce the dextran?
Dextran is now produced from sucrose by certain lactic acid bacteria of the family lactobacillus. Species include Leuconostoc mesenteroides and Streptococcus mutans. The structure of dextran produced depends not only on the family and species of the bacterium but on the strain.
How is dextran produced by microbial fermentation?
Dextran is a bacterial polysaccharide, which is commercially available, and it is used as drugs, especially as blood plasma volume expander. Dextran is produced at the industrial level by the fermentation of sucrose-rich media.
How to produce dextran?
Dextrans are glucose polymers with molecular weights ranging between 1,000–40,000,000 daltons (Da). They are produced by lactic acid bacteria from solutions that contain saccharide, but also by the dental plaque-forming species, Streptococcus mutans.
What is the substrate for the enzyme Dextransucrase?
EC no. CAS no. Thus, the two substrates of this enzyme are sucrose and (1,6-alpha-D-glucosyl)n, whereas its two products are D-fructose and (1,6-alpha-D-glucosyl)n+1.
Is dextran an anticoagulant?
Carboxymethyl dextran benzylamide sulfonate/sulfates (CMDBS) are synthetic polysaccharides with anticoagulant activity. The anticoagulant activity of CMDBS was due both to direct thrombin inhibition and to catalysis of thrombin inhibition by HCII.
Is dextran a blood product?
High-molecular weight dextran is a plasma volume expander made from natural sources of sugar (glucose). It works by restoring blood plasma lost through severe bleeding. Severe blood loss can decrease oxygen levels and can lead to organ failure, brain damage, coma, and possibly death.
Is dextran 70 safe for eyes?
Many people using this medication do not have serious side effects. Tell your doctor right away if any of these unlikely but serious side effects occur: eye pain, change in vision, continued eye redness/irritation. A very serious allergic reaction to this drug is rare.
Is iron dextran safe?
Iron dextran can cause severe and sometimes fatal allergic reactions or severely low blood pressure. Tell your caregiver right away if you feel light-headed or if you suddenly have trouble breathing.
Is dextran bad for your eyes?
What are the clinical uses of dextran?
Dextran is a medication used in managing and treating various clinical conditions, including during hemorrhage, shock, surgical procedures, radiological imaging, antithrombotic administration, and ophthalmic relief of xerophthalmia.
Has anyone died from iron infusion?
An elderly woman was given an infusion of iron dextran in 5% dextrose. Shortly after the infusion started, she developed laryngeal stridor, shock, respiratory arrest, and died despite attempts at resuscitation. Necropsy findings are described and are consistent with death due to anaphylaxis.
Which iron infusion is safest?
Oral iron is less expensive, easier to administer, and possibly safer than IV preparations.
What kind of bacteria can produce dextransucrase?
Dextransucrase can also be produced by other bacteria like Streptococcus and Lactobacillus but the most used strain in research is L. mesenteroides [5]. This strain of Leuconostoc grows between 5 and 30°C but the optimum range is between 25 and 30°C.
How is dextran and fructose produced in a bioreactor?
The production of dextransucrase, dextran and fructose by sucrose fermentation using Leuconostoc mesenteroides NRRL-B512 (F) was studied in batch operation in a bioreactor with total working volume of 1.5 dm 3. The effect of temperature (20 to 40°C), pH (5.5 and 6.7) and sucrose concentration (10 to 120 g/l) on process performance was studied.
How does sucrose affect the production of dextran?
The effect of sucrose concentration on the production of dextransucrase was assessed by Tsuchiya et al. [4]. They found that higher sucrose levels induced better enzyme production but the cultures contained so much dextran that the removal of cells was very difficult.
What are the optimal conditions for the production of dextran?
The effect of temperature (20 to 40°C), pH (5.5 and 6.7) and sucrose concentration (10 to 120 g/l) on process performance was studied. The optimum conditions for dextran and fructose production were T = 35°C and pH = 5.5.