Find the best tutors and institutes for Class 12 Tuition
Q10(c):
Describe briefly the following: (c) Downstream processing
Solution :
Definition and Core Objective
Downstream processing refers to the series of stages that a biosynthetic product—typically a protein, secondary metabolite, or therapeutic agent—undergoes after the completion of the fermentation or upstream cultivation phase. Its primary objective is to transform a crude mixture containing the desired product, cellular debris, growth media, and metabolic byproducts into a highly pure, stable, and standardized final form [Per Industrial Biotechnology Standards].
Step 1: Recovery and Cell Harvesting
The first stage involves the separation of the product from the fermentation broth. If the product is intracellular (retained within the microorganism), the cells must be harvested first via:
- Centrifugation: Utilizing density gradients to pellet cells.
- Filtration: Using membrane filters to separate biomass from the liquid medium [By Principles of Fluid-Solid Separation].
Step 2: Purification of the Product
Once the product is isolated from the bulk biomass, it must be separated from other proteinaceous or molecular contaminants. This stage involves:
- Chromatography: Leveraging differences in molecular size, charge, hydrophobicity, or specific affinity (e.g., Ion-Exchange Chromatography, Affinity Chromatography) [By Principle of Selective Adsorption].
- Precipitation: Using agents like ammonium sulfate or ethanol to selectively salt out the target protein based on solubility.
Step 3: Polishing and Formulation
The final stage ensures the product is in a condition suitable for commercial use and long-term stability:
- Polishing: Final purification steps to remove trace contaminants (e.g., endotoxins, residual DNA).
- Formulation: The addition of preservatives, stabilizers, and buffers to prevent degradation [Per Pharmacopeial Standards].
- Drying: Lyophilization (freeze-drying) is often employed to convert liquid products into shelf-stable powder forms.
Process Flow Illustration
Comparative Summary Table
| Stage | Function | Key Technique |
|---|---|---|
| Recovery | Separation of cells | Centrifugation/Filtration |
| Purification | Removal of impurities | Chromatography |
| Formulation | Stabilization | Lyophilization |
Final Solution: Downstream processing is the critical industrial sequence of separation, purification, and formulation performed on a biosynthetic product to achieve the high levels of purity required for pharmaceutical and commercial applications.
More Questions from Class 12 Biology Biotechnology: Principles and Processes EXERCISES
- Q1: Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).
- Q1: Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).
- Q2: Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces.
- Q2: Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces.
- Q3: From what you have learnt, can you tell whether enzymes are bigger or DNA is bigger in molecular size? How did you know?
- Q3: From what you have learnt, can you tell whether enzymes are bigger or DNA is bigger in molecular size? How did you know?
- Q4: What would be the molar concentration of human DNA in a human cell? Consult your teacher.
- Q4: What would be the molar concentration of human DNA in a human cell? Consult your teacher.
- Q5: Do eukaryotic cells have restriction endonucleases? Justify your answer.
- Q5: Do eukaryotic cells have restriction endonucleases? Justify your answer.
- Q6: Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?
- Q6: Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?
- Q7: Collect 5 examples of palindromic DNA sequences by consulting your teacher. Better try to create a palindromic sequence by following base-pair rules.
- Q7: Collect 5 examples of palindromic DNA sequences by consulting your teacher. Better try to create a palindromic sequence by following base-pair rules.
- Q8: Can you recall meiosis and indicate at what stage a recombinant DNA is made?
- Q8: Can you recall meiosis and indicate at what stage a recombinant DNA is made?
- Q9: Can you think and answer how a reporter enzyme can be used to monitor transformation of host cells by foreign DNA in addition to a selectable marker?
- Q9: Can you think and answer how a reporter enzyme can be used to monitor transformation of host cells by foreign DNA in addition to a selectable marker?
- Q10(a): Describe briefly the following: (a) Origin of replication
- Q10(a): Describe briefly the following: (a) Origin of replication
- Q10(b): Describe briefly the following: (b) Bioreactors
- Q10(b): Describe briefly the following: (b) Bioreactors
- Q10(c): Describe briefly the following: (c) Downstream processing
- Q11(a): Explain briefly (a) PCR
- Q11(a): Explain briefly (a) PCR
- Q11(b): Explain briefly (b) Restriction enzymes and DNA
- Q11(b): Explain briefly (b) Restriction enzymes and DNA
- Q11(c): Explain briefly (c) Chitinase
- Q11(c): Explain briefly (c) Chitinase
- Q12(a): Discuss with your teacher and find out how to distinguish between (a) Plasmid DNA and Chromosomal DNA
- Q12(a): Discuss with your teacher and find out how to distinguish between (a) Plasmid DNA and Chromosomal DNA
- Q12(b): Discuss with your teacher and find out how to distinguish between (b) RNA and DNA
- Q12(b): Discuss with your teacher and find out how to distinguish between (b) RNA and DNA
- Q12(c): Discuss with your teacher and find out how to distinguish between (c) Exonuclease and Endonuclease
- Q12(c): Discuss with your teacher and find out how to distinguish between (c) Exonuclease and Endonuclease
CBSE Solutions for Class 12 Biology Biotechnology: Principles and Processes
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
Top Tutors who teach Biotechnology: Principles and Processes
Top Tutor
Bade Kajipur, Gorakhpur
20 yrs of
Exp
7 students
1215 hrs of classes completed
350
per hour
Online Classes
Student's Home
Tutor's home
l am Physics teacher,usually I teach class 11, 12 and competitive exam like NEET and JEE teaching offline classes since 2004 and online classes since 2020, My Students Raunak singh in 2023 Crack NEET with AIR 555 score 695/720, and he scored 99/100 in Class 12 ISC Board and Aditi Srivastava in 2022 Crack NEET in first attempt score 621/720, and she scored 95/100 in class 12 CBSE Board. Received Appreciation Letter from HRD Minister(Central Government) Smriti Zubin Irani My proficiency is in physics. Advika, If you want online physics class through Urbanpro platform, please let me know. Monthly Fees 4000/- for 3 days in a week and in a month 12 hours Every Live Class is of 1hour , including Precise Notes of each topic Practice Questions and Online Test With Video Solutions. Formula Sheet for every chapter. Course Fees of NEET 2025 Crash Course for Physics is 12000/- I prefer to teach physics specially class 11 and 12, I do focus on Competitive level Physics like N.E.E.T. and I.I.T.J.E.E. along with basic physics to make my students understand physics easier. My focus is on competitive exam for betterment of students. I have been teaching Physics twenty years of teaching experience, I had done my schooling and college from Gorakhpur city Uttar Pradesh. I am Teaching since 2004 in Gorakhpur initially off-line, and teaching online since 2020. I do provide study material like Notes, Question Bank and D.P.P., No Additional charge is require to pay, it is included in class fees. 4000/- for 3 days in a week and in a month 12 hours l am Physics teacher,usually I teach class 11, 12 and competitive exam like NEET and JEE teaching offline classes since 2004 and online classes since 2020, My proficiency is in physics. I have received a letter of appreciation from the HRD ministry of the central government of India.
He's one of the most exceptional teacher, I have ever been a student of. Sir teaches in such a way that you can imagine it in your mind, and the concepts never leave you. I was scared of physics earlier, but now I am able to solve questions with much ease and much more confident in it.
Top Tutor
Sector 10, Dwarka, Delhi
6 yrs of
Exp
5 students
535 hrs of classes completed
480
per hour
Online Classes
I am (English Educator). I've been teaching for more than 8 years. My background includes planning and teaching English to children as well as adults. I have worked with UNACADEMY, Chandigarh University, Mahendras and many more institutions. I got certified as a Meet & Greet officer, conforming to National Skill Qualifications Framework Level-4. Two times winner in Declamation contest at the college level
Top Tutor
Laxmi Vihar, Hisar
4 yrs of
Exp
11 students
267 hrs of classes completed
800
per hour
Online Classes
I'm a mathematics' teacher. My goal is to teach you how you can think out a solution rather than roboting your way out. We will dive deep into concepts of mathematics and come out as a well learned and scrupulous student. I am ready to clear your hurdles with most accurate way. I have taught at many academies for JEE preparations. In addition to it I have taught online in UrbanPro from past 4 years.
Suman is an awesome teacher and connects well with the student and gets them to grasp concepts and be interested in the subject. Highly recommend him for math.
Top Tutor
Dilshad Garden, Delhi
3 yrs of
Exp
27 students
941 hrs of classes completed
260
per hour
Online Classes
I have been teaching classes for 12th from 2021 onwards. I have taught students across all the board be it CBSE or NIOS or State or ICSE.
Before joining ankit sir’s classes I used to struggle with accounting entires but sir made the fundamentals very clear and helped me a lot.
Super Tutor
Virugambakkam, Chennai
2 yrs of
Exp
12 students
461 hrs of classes completed
1000
per hour
Online Classes
My students get acquainted with me easily... I will be both friendly and strict ( according to the need)... Students love to learn physics with me. Their learning process will be in easy and efficient. They will Excel in concepts and problem solving
Other Subjects in CBSE - Class 12
Download free CBSE - Class 12 Biology Biotechnology: Principles and Processes EXERCISES worksheets
Download Now
