Ce diaporama a bien été signalé.
Nous utilisons votre profil LinkedIn et vos données d’activité pour vous proposer des publicités personnalisées et pertinentes. Vous pouvez changer vos préférences de publicités à tout moment.
ASHIKA RAVEENDRAN
2ND MSC BIOTECHNOLOGY
VITAMINS
 Vitamins are essential micronutrients required
in trace quantities that cannot be synthesized
by mammals
 They...
 Today many processed foods, feeds
pharmaceuticals, cosmetics and chemical
contain extraneously added vitamins or vitamin...
FAT SOLUBLE VITAMINS
 Vitamin A
 Vitamin D
 Vitamin E
 Vitamin K
Vitamin E
 Most abundant among fat soluble vitamins and has
the highest antioxidant activity in vivo.
 In nature, only p...
 Currently ∞-tocopherol is obtained by chemical
synthesis and by extraction from vegetable oils
 Extraction from oil is ...
 production of high amounts of vitamin E has
been successfully demonstrated by E. gracilis Z.
using two-step culture.
 I...
.
Vitamin KVitamin K₂ Vitamin K₂Vitamin K₁
Fermentative Production of
Vitamin K₂
 Tani and Taguchi have reported that as much
as 182 mg/L MK was produced using
dete...
 The highest production rate of 36.6 mg/g
was seen in the Chinese natto strain
followed by (in mg/g of okara-natto wet
ma...
 WATER SOLUBLE VITAMINS
 Biotin
 Riboflavin
 cyanocobalamin
VITAMIN B 12
 Cyanocobalamin, by definition vitamin
B12, is the industrially produced stable
cobalamin form which is not ...
VITAMIN B 12
BIOSYNTHESIS
MICROORGANISMS IN
INDUSTRIAL PRODUCTION OF
VIT. B12 Streptomyces griseus , S. olivaceus , Bacillus
megaterium ,
B. coagul...
 Manufactured by submerged fermentation
 Aeration and agitation of medium essential
 Fermentation process completed in ...
VIT.B12 PRODUCTION USING
Streptomyces olivaceus NRRL B-1125
PREPARATION OF INOCULUM
 Pure slant culture of Streptomyces olivaceus
NRRL B-1125 is inoculated and grown in 100
to 250 m...
PRODUCTION MEDIUM
 Consist of carbohydrate ,proteinaceous material ,
and source of cobalt and other salts .
 Sterilizati...
TEMPERATURE , PH ,
AERATION AND AGITATION
 Temperature : 80°F
 pH: At starting of process pH falls due to rapid
consumpt...
ANTIFOAM AGENT ,
PREVENTION OF
CONTAMINATION Antifoam agent : soya bean oil , corn oil,
lard oil and silicones (sterilize...
DOWNSTREAM PROCESS OF
VITAMIN B12
DISSOLVED VITAMIN B
12
CONCENTRATION OF
CELL MASS
CREAM CONCENTRATION OF CELL
MASS
EX(TR...
Dissolved vitamin B12
Chromatography
Pure vitamin B12
Crystallisation from organic
solvents
RIBOFLAVIN
 Riboflavin, or vitamin B2, is used for human
nutri- tion and therapy and as an animal feed
additive.
 Its de...
MICRO –ORGANISMS IN
INDUSTRIAL PRODUCTION OF
VIT. B2
 Although bacteria (Clostridium sp.) and yeasts
(Candida sp.) are go...
OTHER MICRO -ORGANISMS
PRODUCING VIT. B 2
 Gene amplification and substitution of wild type
promoters and the regulatory ...
PREPARATION OF INOCULUM
 Starts from slants or spores dried on sand.
 After 1 or 2 stages, further propagation is
carrie...
PRODUCTION MEDIUM
 Fermentor 10,000 to 1,00,000 gals range.
 Production medium designed according to type of
micro- orga...
 Ertrk et al. studied fermentative production of riboflavin by
Ashbya gossypii in a medium containing whey.
 The quantit...
 For Eremothecium ashbyii - still slops from alcohol industry with skim milk ,
soya bean meal or casein(protein source),m...
CONDITIONS
 pH : 6 to 7.5
 Temperature : 26 to 28 °C
 Fermentation : submerged aerated fermentation
 Fermentation time...
DOWNSTREAM
PROSSESSING OF
RIBOFLAVIN Riboflavin is recovered from the broth by
centrifu- gation after inactivation of the...
VITAMIN C
 L-ascorbic acid finds its use mainly in food
industry, being a vitamin as well as an
antioxidant.
 Majority o...
REICHESTEIN PROCESS
.
Reichestein Process
Diacetone-L-
Sorbose
L-Sorbose
D-Sorbitol
D-Glu
2-Keto-L-
Gluconic
acid methyl
e...
Sorbitol
pathway
2-keto-D-
gluconic
acid
pathway
Yeast Based Fermentative
Processes
 Saccharomyces cerevisiae and
Zygosaccharomyces sp. produce L-ascorbic
acid intracellu...
FERMENTATION BY ALGAE
 Skatrud and Huss described a method that
involved initial growth of Chlorella pyrenoidosa
ATCC5317...
BIOTIN (VITAMIN H)
 Biotin (vitamin H) is one of the most fascinating
cofactors involved in central pathways in pro- and
...
Biosynthesis of Biotin
The conversion of
dethiobiotin to biotin
has not been
resolved.
bioF gene
bioD gene
bioB gene
bioA ...
 Ogata et al. screened microorganisms and
demonstrated that the bacterium B.
sphaericus can excrete significant quantitie...
Microbial fermentation of amino acids
Glutamic acid
 Microbial production of l-glutamic acid has been
extensively studied by a large number of research
investi...
 Other glutamic acid-producing organisms
include Escherichia coli, Bacillus
megaterium, Bacillus circulans, Bacillus
cere...
MEDIA COMPOSITION
 The seed medium composition can be used:
glucose (8%), NH4Cl (0.5%), corn steep liquor
(0.3%), K2HPO4 ...
 The entire contents of the one flask is then
transferred to a 2.0 L capacity fermenter with
500 mL of sterile nutrient m...
INDUSTRIAL APPLICATIONS
AND THERAPEUTIC ROLE
 The greatest application of glutamic acid and
its salt is in the food indus...
LYSINE
 l-Lysine is one of the leading and most
exploited amino acid among the
essential amino acids list.
 l-lysine can...
FERMENTATIVE PRODUCTION
OF LYSINE
 Organism: mutant strain of C.glutamicum
 In commercial-scale starches, molasses and
g...
 In most cases, the optimum pH of the
medium has been 7.2 and
temperature at 30°C.
 The seed stage cultivation requires
...
INDUSTRIAL APPLICATIONS
AND THERAPEUTIC ROLE
 It is an important additive to animal feed for
optimizing the growth of pig...
TRYPTOPHAN
 No scientific reports were available
relating to the microbial direct
production of tryptophan. During this
p...
FERMENTATIVE PRODUCTION
 Genetically modified strain of C. glutamicum
that is capable of producing tryptophan.
 Fermenta...
 The fermenters can be harvested after
72 h.
 Product recovery is usually done using
ultracentrifugation at around 10,00...
INDUSTRIAL APPLICATIONS
AND THERAPEUTIC ROLE
 Tryptophan has a wide range of
applications in the feed and
pharmaceutical ...
THANK YOU !!!
Fermentative production of vitamins and amino acids
Fermentative production of vitamins and amino acids
Prochain SlideShare
Chargement dans…5
×

Fermentative production of vitamins and amino acids

7 933 vues

Publié le

this describes the amino acids and vitamin production by fermentation with different media and microbes

Publié dans : Sciences
  • Identifiez-vous pour voir les commentaires

Fermentative production of vitamins and amino acids

  1. 1. ASHIKA RAVEENDRAN 2ND MSC BIOTECHNOLOGY
  2. 2. VITAMINS  Vitamins are essential micronutrients required in trace quantities that cannot be synthesized by mammals  They are essential for metabolism for all living organisms  Apart from their nutritional –physiological roles as growth factor ,vitamins are increasingly being introduced as food/feed additives ,as medical therapeutic agents .
  3. 3.  Today many processed foods, feeds pharmaceuticals, cosmetics and chemical contain extraneously added vitamins or vitamin related compounds.  Presently few of the vitamins are chemically synthesized or via extraction processes  With growing consumer consciousness led to substituting with biotechnological processes.
  4. 4. FAT SOLUBLE VITAMINS  Vitamin A  Vitamin D  Vitamin E  Vitamin K
  5. 5. Vitamin E  Most abundant among fat soluble vitamins and has the highest antioxidant activity in vivo.  In nature, only photosynthetic organisms are capable of producing α-tocopherol.  In humans, ∞-tocopherol is believed to play a major role in prevention of light induced pathologies of the skin, eyes and degenerative disorders such as atherosclerosis, cardiovascular diseases and cancer.  Industrial application of ∞-tocopherol includes its use in preservation of food, in cosmetics and sunscreens
  6. 6.  Currently ∞-tocopherol is obtained by chemical synthesis and by extraction from vegetable oils  Extraction from oil is not efficient ,as these typically contains low levels of ∞-tocopherol.  Several strains of freshwater microalgae Euglena gracilis Z and marine microalgae Dunaliella tertiolecta produce ∞-tocopherol in concentrations higher than conventional foods.
  7. 7.  production of high amounts of vitamin E has been successfully demonstrated by E. gracilis Z. using two-step culture.  In the first step of the batch culture, E. gracilis Z. was photo- heterotrophically cultivated in modified Oda and modified Hunter media at high light intensity.  When the cells reached late exponential phase, they were separated, washed and resuspended in the same volume of Cramer and Mayers (CM) medium for the second step of cultivation.  The two-step cultures using high cell densities gave high productivity of antioxidant vitamin
  8. 8. . Vitamin KVitamin K₂ Vitamin K₂Vitamin K₁
  9. 9. Fermentative Production of Vitamin K₂  Tani and Taguchi have reported that as much as 182 mg/L MK was produced using detergent supplement culture and a mutant of Flavabacterium.  Lactic acid bacteria are reported to produce MK with the yield of 29–123 g/L MK-7, MK-8, MK-9 and MK-10.  In fermented soybeans, Bacillus subtilis produces menaquinones, the major component being MK-7 and the minor one being MK-6.  Sumi studied production of MKs by the fermentation of okara with seven different natto bacilli.
  10. 10.  The highest production rate of 36.6 mg/g was seen in the Chinese natto strain followed by (in mg/g of okara-natto wet mass): 14.2 in Naruse, 11.9 in Asahi, 6.8 in Takahashi, 1.9 in Miyagino (natto bacilli for food production), and 5.2 in Nitto and 1.9 in Meguro (natto bacilli for medicine) after incubation for 4 days at 37 °C.  The water-soluble vitamin K was isolated as a dark yellow powder by DEAE Sepharose chromatography and membrane filter fractionations.
  11. 11.  WATER SOLUBLE VITAMINS  Biotin  Riboflavin  cyanocobalamin
  12. 12. VITAMIN B 12  Cyanocobalamin, by definition vitamin B12, is the industrially produced stable cobalamin form which is not found in nature.  Vitamin B12 is obtained exclusively by fermentation process.  Important dietary component, requirement 0.001 mg/day.  Cyanocobalamin consist of a cobinamide linked to a nucleotide.  Cobinamide – cobalt linked to cyanide grp, surrounded by 4 reduced pyrrole ring.  Nucleotide – 5 , 6 – dimethyl benziminazole
  13. 13. VITAMIN B 12 BIOSYNTHESIS
  14. 14. MICROORGANISMS IN INDUSTRIAL PRODUCTION OF VIT. B12 Streptomyces griseus , S. olivaceus , Bacillus megaterium , B. coagulans , Pseudomonas denitrificans , Propionibacterium freudenreichii , P. shermanii and a mixed fermentation of a Proteus spp and a Pseudomonas sp.
  15. 15.  Manufactured by submerged fermentation  Aeration and agitation of medium essential  Fermentation process completed in 3 to 5 days
  16. 16. VIT.B12 PRODUCTION USING Streptomyces olivaceus NRRL B-1125
  17. 17. PREPARATION OF INOCULUM  Pure slant culture of Streptomyces olivaceus NRRL B-1125 is inoculated and grown in 100 to 250 ml of inoculum medium.  Seeded flask are kept on shaker for incubation .  Flask cultures are used to inoculate large amount of inoculum media arranged in series of tank .  2 or 3 successive transfers are made to obtain required amount of inoculum cultures.  Inoculum of production tank must be 5% of the volume of production medium
  18. 18. PRODUCTION MEDIUM  Consist of carbohydrate ,proteinaceous material , and source of cobalt and other salts .  Sterilization of medium batch wise or continuously .  Batch – medium heated at 250°F for 1 hr  Continuous – 330°F for 13 min by mixing with live steam. COMPONENTS AMOUNT (%) Distillers solubles 4.0 Dextrose 0.5 to 1 CaCO3 0.5 COCl2.6H2O 1.5 to 10 p.p.m.
  19. 19. TEMPERATURE , PH , AERATION AND AGITATION  Temperature : 80°F  pH: At starting of process pH falls due to rapid consumption of sugar, then rises after 2 to 4 due to lysis of mycelium pH 5 is maintained with H2SO4 and reducing agent Na2SO4 .  Aeration and agitation : Optimum rate of aeration is 0.5 vol air/vol medium/min. Excess aeration cause foaming.
  20. 20. ANTIFOAM AGENT , PREVENTION OF CONTAMINATION Antifoam agent : soya bean oil , corn oil, lard oil and silicones (sterilized before adding) .  Prevention of contamination : essential to maintain sterility , contamination results in reduced yields , equipments must be sterile and all transfers are carried out under aseptic conditions  Yield : yield of cobalamin are usually in the range of 1 to 2 mg. per litre in the fermented broth
  21. 21. DOWNSTREAM PROCESS OF VITAMIN B12 DISSOLVED VITAMIN B 12 CONCENTRATION OF CELL MASS CREAM CONCENTRATION OF CELL MASS EX(TRACTION Eg :alcohol such as methanol
  22. 22. Dissolved vitamin B12 Chromatography Pure vitamin B12 Crystallisation from organic solvents
  23. 23. RIBOFLAVIN  Riboflavin, or vitamin B2, is used for human nutri- tion and therapy and as an animal feed additive.  Its deficiency in humans is correlated with loss of hair, inflammation of skin, vision deterioration, and growth failure.  This vitamin has also been found to be successful in treatment of migraine and malaria .  Riboflavin has been produced commercially by chemical synthesis, by fermentation and by a combination of fermentation and chemical synthesis.
  24. 24. MICRO –ORGANISMS IN INDUSTRIAL PRODUCTION OF VIT. B2  Although bacteria (Clostridium sp.) and yeasts (Candida sp.) are good producers, two closely related ascomycete fungi, Eremothecium ashbyii and Ashbya gossypii, are considered the best riboflavin producers.  Ashbya gossypii produces 40 000 times more vitamin than it needs for its own growth.
  25. 25. OTHER MICRO -ORGANISMS PRODUCING VIT. B 2  Gene amplification and substitution of wild type promoters and the regulatory regions with strong constitutive promoter from Bacillus subtilis have resulted in increased riboflavin production .  Lactococcus lactis MG 1363 strain using both direct mutagenesis and metabolic engineering for simultaneous overproduction of both folate and riboflavin  Improved strains for the production of riboflavin were constructed through metabolic engineering using recombinant DNA techniques in Corynebacterium ammoniagenes
  26. 26. PREPARATION OF INOCULUM  Starts from slants or spores dried on sand.  After 1 or 2 stages, further propagation is carried on 1 or 2 tank inoculum stages
  27. 27. PRODUCTION MEDIUM  Fermentor 10,000 to 1,00,000 gals range.  Production medium designed according to type of micro- organism.  Ashbya gossypii : sources - palm oil ,corn steep liquor, glucose, molasses , whey, collagen , soya oil , glycine.  Stahmann et al. reported riboflavin yields in excess of 15 g/L of culture broth in a sterile aerobic submerged fermentation of Ashbya gossypii with a nutrient medium containing molasses or plant oil as major carbon source.
  28. 28.  Ertrk et al. studied fermentative production of riboflavin by Ashbya gossypii in a medium containing whey.  The quantities of riboflavin produced by Ashbya gossypii in whey with different supplements. Supplement Quantity of riboflavin (mg./L) Bran 389.5 Glycine + peptone 120 Sucrose 87.5 Glycine 78.3 Yeast extract 68.4 Peptone 23.2 Soyabean oil 17.5
  29. 29.  For Eremothecium ashbyii - still slops from alcohol industry with skim milk , soya bean meal or casein(protein source),maltose/ sucrose/glucose (carbohydrate source).  low cost organic wastes as flavinogenic factors and the various concentrations at which they induced flavinogenecity resulting in higher yields of riboflavin  Organic wastes like beef extract, hog casings, blood meal or fish meal supported the production of riboflavin from Eremothecium ashbyii NRRL 1363.  Recent studies with wild type of E. ashbyii have yielded 3.3 g/L of riboflavin using molasses and peanut seed cake as carbon and nitrogen source, respectively
  30. 30. CONDITIONS  pH : 6 to 7.5  Temperature : 26 to 28 °C  Fermentation : submerged aerated fermentation  Fermentation time : 96 to 120 hrs  Aeration & agitation required.  Yield : 3 to 6 g or more / litre
  31. 31. DOWNSTREAM PROSSESSING OF RIBOFLAVIN Riboflavin is recovered from the broth by centrifu- gation after inactivation of the microorganisms by heat.  Pasteurization of the broth ensures that no viable cells of the production organism are present in the final product.  After heating, the cell mass is separated from fermentation broth by centrifugation.  Differential centrifugation leads to separation of cells and riboflavin crystals because of differences in size and sedimentation behaviour.  Riboflavin is then recovered from cell-free broth by using evaporation and vacuum drying.
  32. 32. VITAMIN C  L-ascorbic acid finds its use mainly in food industry, being a vitamin as well as an antioxidant.  Majority of commercially manufactured L- ascorbic acid is synthesized via Reichstein process using D-glucose as a starting material  Approximately 50 % of synthetic ascorbic acid is used in vitamins supplements and pharmaceutical preparations.  Because of its antioxidant properties and its potential to stimulate collagen production, it is also widely used as an additive to cosmetics.
  33. 33. REICHESTEIN PROCESS . Reichestein Process Diacetone-L- Sorbose L-Sorbose D-Sorbitol D-Glu 2-Keto-L- Gluconic acid methyl ester L- Ascorbic acid
  34. 34. Sorbitol pathway 2-keto-D- gluconic acid pathway
  35. 35. Yeast Based Fermentative Processes  Saccharomyces cerevisiae and Zygosaccharomyces sp. produce L-ascorbic acid intracellularly when incubated with L- galactose.  Over-expression of the D-arabinose dehydrogenase and D-arabinono-1,4-lactone oxidase in Saccharomyces cerevisiae enhances this ability significantly.
  36. 36. FERMENTATION BY ALGAE  Skatrud and Huss described a method that involved initial growth of Chlorella pyrenoidosa ATCC53170 in a fermentor with a carbon source that is sufficient for the cells to grow to an intermediate density. At the depleted stage, additional carbon source was added sequentially or continuously to maintain the carbon source concentration below a predetermined level until the addition is terminated. This resulted in the production of 1.45 g/L of L-ascorbic acid.  Euglena gracilis Z. is one of the few microorganisms which simultaneously produce antioxidant vitamins such as carotene (71 mg/L), vitamin C (86.5 mg/L) and vitamin E (30.1 mg/L).
  37. 37. BIOTIN (VITAMIN H)  Biotin (vitamin H) is one of the most fascinating cofactors involved in central pathways in pro- and eukaryotic cell metabolism.  While humans and animals require several hundred micrograms of biotin per day, most microbes, plants and fungi appear to be able to synthesize the cofactor themselves.  Biotin is added to many food, feed and cosmetic products.  Majority of the biotin sold is synthesized chemically.  The chemical synthesis is linked with a high environmental burden, much effort has been put into the development of biotin-overproducing microbes
  38. 38. Biosynthesis of Biotin The conversion of dethiobiotin to biotin has not been resolved. bioF gene bioD gene bioB gene bioA gene
  39. 39.  Ogata et al. screened microorganisms and demonstrated that the bacterium B. sphaericus can excrete significant quantities of biotin synthetic pathway intermediates from precursor, Pimelic acid.
  40. 40. Microbial fermentation of amino acids
  41. 41. Glutamic acid  Microbial production of l-glutamic acid has been extensively studied by a large number of research investigators.  The most popular Coryneform species include C.glutamicum, Corynebacterium, Brevibacterium flavum, Brevibacterium lactofermentum, Brevibacterium divarticum, Brevibacterium ammoniagenes, Brevibacterium thio- genetalis, Brevibacterium saccharoliticum, and Brevibacterium roseum .
  42. 42.  Other glutamic acid-producing organisms include Escherichia coli, Bacillus megaterium, Bacillus circulans, Bacillus cereus, and Sarcina lutea.  Industrially, glutamic acid is usually manufactured by batch/fed-batch submerged fermentation processes using genetically modified strains of Corynebacterium or Brevibacterium.
  43. 43. MEDIA COMPOSITION  The seed medium composition can be used: glucose (8%), NH4Cl (0.5%), corn steep liquor (0.3%), K2HPO4 (0.5%), KH2PO4 (0.5%), MgSO4·7H2O (0.03%), CaCO3 (1.0%), and deionized water to make 100%.  The pH of the medium -7.2  The inoculated flasks are grown in an orbital shaker incubator maintained at 30°C and 230 rpm for 15 h.
  44. 44.  The entire contents of the one flask is then transferred to a 2.0 L capacity fermenter with 500 mL of sterile nutrient medium containing molasses (20%), KH2PO4 (0.5%), KH2PO4 (0.5%), MgSO4·7H2O (0.3%), urea (0.8%), CaCO3 (1.0%), and deionized water to make 100%.  In most cases, the optimum pH of the medium was recorded as 7.0.  The fermentation is usually initiated with continuous agitation and aeration for 48 h at 30°C
  45. 45. INDUSTRIAL APPLICATIONS AND THERAPEUTIC ROLE  The greatest application of glutamic acid and its salt is in the food industry as a flavor enhancer.  To aid in peptic ulcer healing  One of the leading roles of glutamic acid in pharmaceuticals is that of a neurotransmitter.  The blockage of NMDA receptors can greatly affect the memory and overall mental performance of an individual.  Glutamic acid and aspartic acid have the capability to combine with NMDA receptors thus increasing cation conductance, depolarizing the cell membrane, and deblocking the NMDA receptors.
  46. 46. LYSINE  l-Lysine is one of the leading and most exploited amino acid among the essential amino acids list.  l-lysine can be synthesized from α- aminoadipic acid by yeast and Neurospora mold, or from diaminopimelic acid (DAP) by E. coli
  47. 47. FERMENTATIVE PRODUCTION OF LYSINE  Organism: mutant strain of C.glutamicum  In commercial-scale starches, molasses and glucose are mostly used as the carbon source.  Care must be taken to create a balance between carbon and nitrogen sources such as corn steep liquor, soybean cake acid hydrolysate, yeast extract, peptone, and the like  Inorganic salts such as KH2PO4, K2HPO4, MgSO4·7H2O,FeSO4·7H2O, ZnSO4·7H2O, MnSO4·7H2O, (NH4)2 SO4.
  48. 48.  In most cases, the optimum pH of the medium has been 7.2 and temperature at 30°C.  The seed stage cultivation requires around 24 h, whereas the fermentation stage is complete by approximately 96 h.  After this, harvesting is done and the product l-lysine is recovered using some suitable and economical method
  49. 49. INDUSTRIAL APPLICATIONS AND THERAPEUTIC ROLE  It is an important additive to animal feed for optimizing the growth of pigs and chickens.  In the food industry, l-lysine is used in a number of dietary or nutritional supplements that are popularly used by athletes, weight lifters, bodybuilders, and even some individuals to boost their energy level and protect their muscles from deterioration.  l-lysine is also recommended for the treatment of some viral infections, for example, herpes simplex, cold sores, shingles, and human papillomavirus infections such as genital warts and genital herpes
  50. 50. TRYPTOPHAN  No scientific reports were available relating to the microbial direct production of tryptophan. During this period, more attention was given by researchers looking into the possibility of tryptophan production  With the introduction of efficient strains of Corynebacterium and E. coli, now tryptophan is largely produced by fermentation
  51. 51. FERMENTATIVE PRODUCTION  Genetically modified strain of C. glutamicum that is capable of producing tryptophan.  Fermentation medium may be prepared from molasses (30%), corn-steep liquor (0.7%), KH2PO4 (0.05%), K2HPO4 (0.15%), MgSO4·7H2O (0.025%), (NH4)2SO4 (1.5%), and calcium carbonate (1%).  In addition vitamin B1, biotin, l-phenylalanine, and l-tyrosine.  pH adjusted to 6.8  1.0 mL of 20% silicon RD in deionized water is added as antifoam.
  52. 52.  The fermenters can be harvested after 72 h.  Product recovery is usually done using ultracentrifugation at around 10,000 rpm, followed by treatment with cation exchange resin and decolorization with activated carbon.  After further centrifugation, the mixture can be subjected to drying under a vacuum dryer.
  53. 53. INDUSTRIAL APPLICATIONS AND THERAPEUTIC ROLE  Tryptophan has a wide range of applications in the feed and pharmaceutical industries.  As an essential amino acid with a unique indole side chain, which indicates its use as a precursor for a number of neurotransmitters in the brain.  Its application in the chemical synthesis of some antidepressant
  54. 54. THANK YOU !!!

×