Bioprocess Technology for the Production of Cell Biomass and Primary & Secondary Metabolites
1. Introduction to Bioprocess Technology
Bioprocess technology refers to the application of living organisms, cells, or their components to produce commercially valuable products under controlled conditions. It combines principles of microbiology, biochemistry, genetics, and chemical engineering.
Bioprocess technology is widely used for the production of:
Cell biomass
Primary metabolites
Secondary metabolites
2. Production of Cell Biomass
Definition
Cell biomass is the total mass of microbial or cultured cells produced during fermentation and harvested as the final product.
Organisms Used
Yeast
Bacteria
Fungi
Algae
Steps in Biomass Production
Selection of suitable organism
Fast growth
Non-pathogenic nature
Inoculum development
Pure culture preparation
Scale-up of culture
Culture medium preparation
Carbon source
Nitrogen source
Minerals and vitamins
Fermentation process
Batch, fed-batch or continuous culture
Harvesting of biomass
Filtration or centrifugation
Downstream processing
Washing, drying and packaging
Applications
Single Cell Protein (SCP)
Probiotics
Animal feed and food supplements
3. Primary Metabolites
Definition
Primary metabolites are growth-associated compounds produced during the logarithmic phase of microbial growth. They are essential for normal cellular metabolism.
Characteristics
Formed during active growth
High yield
Simple chemical structure
Examples
Alcohols
Organic acids
Amino acids
Vitamins
Production Process
Organisms are grown in nutrient-rich medium
Fermentation conditions such as pH, temperature, aeration, and agitation are strictly controlled
Mainly produced by batch or fed-batch fermentation
Product is recovered by filtration, distillation or crystallization
4. Secondary Metabolites
Definition
Secondary metabolites are non-growth-associated compounds produced during the stationary phase of growth. They are not essential for growth but have ecological and commercial importance
Characteristics
Produced after growth slows down
Species-specific
Complex molecular structure
Low concentration
Examples
Antibiotics
Alkaloids
Pigments
Toxins
Production Process
Usually involves two-stage fermentation
First stage supports cell growth
Second stage promotes metabolite synthesis
Nutrient limitation (nitrogen or phosphate) enhances production
Product recovery involves extraction and purification
5. Fermentation Methods Used
Batch Fermentation
Closed system
All nutrients added at the beginning
Commonly used for secondary metabolites
Fed-Batch Fermentation
Nutrients added intermittently
Prevents substrate inhibition
Used for primary metabolites
Continuous Fermentation
Constant inflow and outflow of medium
High productivity
Used for biomass production
6. Factors Affecting Biomass and Metabolite Production
Carbon source concentration
Nitrogen availability
pH of medium
Temperature
Oxygen supply
Agitation rate
Growth phase of organism
7. Downstream Processing
Downstream processing includes all steps involved in separation, purification, and formulation of the final product.
Steps
Removal of cells
Cell disruption (if product is intracellular)
Extraction of product
Purification
Drying and formulation
8. Applications of Bioprocess Technology
Pharmaceutical production
Food and beverage industry
Agriculture (biofertilizers, biopesticides)
Industrial enzymes
Environmental biotechnology
9. Advantages
Eco-friendly process
Large-scale production
High specificity
Cost-effective
10. Conclusion
Bioprocess technology is essential for the industrial production of biomass and metabolites. By optimizing fermentation conditions and microbial growth, valuable products used in medicine, food, and industry can be produced efficiently.
1. Bioprocess technology mainly deals with
A. Chemical synthesis
B. Use of living cells for product formation
C. Physical separation methods
D. Nuclear reactions
Answer: B
2. Cell biomass refers to
A. Metabolic waste
B. Total mass of cells produced
C. Culture medium
D. Enzymes only
Answer: B
3. Single Cell Protein (SCP) is obtained from
A. Plants only
B. Animals
C. Microorganisms
D. Minerals
Answer: C
4. Which organism is commonly used for biomass production?
A. Virus
B. Yeast
C. Protozoa
D. Algae
Answer: B
5. The phase of growth associated with primary metabolite production is
A. Lag phase
B. Log phase
C. Stationary phase
D. Death phase
Answer: B
6. Primary metabolites are
A. Non-essential for growth
B. Produced during stationary phase
C. Growth-associated products
D. Toxic substances
Answer: C
7. Which of the following is a primary metabolite?
A. Penicillin
B. Streptomycin
C. Ethanol
D. Toxin
Answer: C
8. Secondary metabolites are mainly produced during
A. Lag phase
B. Log phase
C. Stationary phase
D. Death phase
Answer: C
9. Secondary metabolites are
A. Essential for growth
B. Growth-associated
C. Species-specific
D. Simple in structure
Answer: C
10. Antibiotics are examples of
A. Primary metabolites
B. Secondary metabolites
C. Enzymes
D. Vitamins
Answer: B
11. Which fermentation system is a closed system?
A. Continuous
B. Batch
C. Chemostat
D. Turbidostat
Answer: B
12. Fed-batch fermentation is mainly used to
A. Stop microbial growth
B. Avoid substrate inhibition
C. Remove waste
D. Sterilize medium
Answer: B
13. Continuous fermentation is best suited for
A. Antibiotic production
B. Biomass production
C. Pigment production
D. Alkaloid production
Answer: B
14. Two-stage fermentation is mainly used for
A. Biomass
B. Primary metabolites
C. Secondary metabolites
D. Enzyme extraction
Answer: C
15. Nutrient limitation enhances the production of
A. Biomass
B. Primary metabolites
C. Secondary metabolites
D. Vitamins
Answer: C
16. Which factor does NOT affect bioprocess production?
A. pH
B. Temperature
C. Light intensity
D. Oxygen availability
Answer: C
17. Downstream processing involves
A. Cell growth
B. Inoculum preparation
C. Product recovery
D. Sterilization only
Answer: C
18. Centrifugation is used for
A. Sterilization
B. Cell separation
C. Aeration
D. Agitation
Answer: B
19. Which metabolite is growth-associated?
A. Penicillin
B. Streptomycin
C. Citric acid
D. Pigments
Answer: C
20. Which microorganism is widely used in industrial fermentation?
A. Virus
B. Yeast
C. Protozoa
D. Helminths
Answer: B
21. Aeration is important mainly for
A. Anaerobic microbes
B. Aerobic microbes
C. Viruses
D. Parasites
Answer: B
22. Agitation in a bioreactor helps in
A. Cell death
B. Uniform mixing
C. Product contamination
D. Inhibition of growth
Answer: B
23. Which is NOT a primary metabolite?
A. Amino acid
B. Vitamin
C. Antibiotic
D. Organic acid
Answer: C
24. Stationary phase occurs when
A. Nutrients are abundant
B. Cell division stops
C. Cells die rapidly
D. No metabolism occurs
Answer: B
25. Bioprocess technology is widely used in
A. Textile industry only
B. Pharmaceutical industry
C. Mining only
D. Construction industry
Answer: B
26. Single Cell Protein is mainly used as
A. Fuel
B. Fertilizer
C. Food and feed supplement
D. Pesticide
Answer: C
27. Which metabolite has complex structure?
A. Primary metabolite
B. Secondary metabolite
C. Biomass
D. Enzyme
Answer: B
28. Extraction is a step of
A. Inoculum preparation
B. Fermentation
C. Downstream processing
D. Sterilization
Answer: C
29. Which process is eco-friendly?
A. Chemical synthesis
B. Nuclear process
C. Bioprocess technology
D. Thermal cracking
Answer: C
30. Which organism produces antibiotics?
A. Yeast
B. Streptomyces
C. Virus
D. Algae
Answer: B
31. Log phase is also called
A. Decline phase
B. Exponential phase
C. Resting phase
D. Death phase
Answer: B
32. The main aim of fed-batch fermentation is
A. Increase contamination
B. Control nutrient level
C. Reduce oxygen
D. Stop growth
Answer: B
33. Which metabolite is produced in large quantity?
A. Secondary metabolite
B. Toxin
C. Primary metabolite
D. Pigment
Answer: C
34. Alkaloids belong to
A. Primary metabolites
B. Secondary metabolites
C. Biomass
D. Enzymes
Answer: B
35. Product inhibition can be reduced by
A. Batch fermentation
B. Fed-batch fermentation
C. No aeration
D. High temperature
Answer: B
36. Sterilization in bioprocess is done to
A. Increase growth
B. Prevent contamination
C. Increase oxygen
D. Reduce pH
Answer: B
37. Which is a non-growth-associated product?
A. Ethanol
B. Citric acid
C. Penicillin
D. Lactic acid
Answer: C
38. Continuous culture maintains cells in
A. Lag phase
B. Log phase
C. Stationary phase
D. Death phase
Answer: B
39. The end product of biomass production is
A. Enzyme
B. Cell mass
C. Antibiotic
D. Vitamin
Answer: B
40. Which is NOT an application of bioprocess technology?
A. Vaccine production
B. Antibiotic production
C. Biofertilizer production
D. Petroleum refining
Answer: D
41. Primary metabolites are essential for
A. Defence
B. Competition
C. Growth and metabolism
D. Pigmentation
Answer: C
42. Pigments are generally
A. Primary metabolites
B. Secondary metabolites
C. Biomass
D. Vitamins
Answer: B
43. Which nutrient limitation enhances antibiotic production?
A. Carbon
B. Nitrogen
C. Oxygen
D. Water
Answer: B
44. Bioreactors provide
A. Uncontrolled conditions
B. Controlled growth environment
C. Only heating
D. Only cooling
Answer: B
45. Which process converts raw material into useful product using microbes?
A. Chemical process
B. Physical process
C. Bioprocess
D. Mechanical process
Answer: C
46. The first step in bioprocess technology is
A. Downstream processing
B. Inoculum preparation
C. Product recovery
D. Packaging
Answer: B
47. Product recovery from broth is part of
A. Fermentation
B. Downstream processing
C. Inoculation
D. Sterilization
Answer: B
48. Which metabolite is produced during stress conditions?
A. Primary metabolite
B. Secondary metabolite
C. Biomass
D. Enzyme
Answer: B
49. Oxygen transfer rate is important in
A. Anaerobic fermentation only
B. Aerobic fermentation
C. Chemical reactions
D. Nuclear reactions
Answer: B
50. Bioprocess technology is important because it is
A. Expensive
B. Hazardous
C. Sustainable and eco-friendly
D. Unreliable
Answer: C
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