Biological objects and process implementation
Successful industrial scaling of biotechnological processes requires specialized equipment and well-designed raw material processing technologies. Products generated by cells act as the primary substrate, which after technological processing becomes the final commercial product.
Modern biotechnology has significantly expanded the range of biological agents used. In addition to classical microorganisms and isolated cell cultures, macro-objects are being actively introduced into the production process:
- Animal and human organs and tissues.
- Whole plant organisms.
A striking example of using macro-objects is the process of obtaining specific immunoglobulins from horse blood serum, as well as the large-scale production of therapeutic drugs based on human donor blood.
Classification of biotechnology products
Various fractions and isolated substances of living organisms are used in production processes. All target products are conventionally divided into four key groups:
- Cells themselves (biomass). Cellular mass is used directly as a source of nutrients or a target product.
- Large molecules. Synthesized by microorganisms during their cultivation. This category includes various enzymes, toxins, antigenic complexes, antibodies, and peptidoglycans.
- Primary metabolites. Low-molecular-weight organic substances (with a mass strictly up to 1500 Da). Their main feature is that they are vital for the normal growth and development of the producing cells themselves. This group includes amino acids, vitamin complexes, nucleotides, and organic acids.
- Secondary metabolites. Compounds that can be either low-molecular-weight or macromolecular. They are not required for basic cell growth, but possess high biological activity. Typical representatives include antibiotics, alkaloids, hormonal preparations, and specific toxins.
Products of biotechnological synthesis
Modern technologies ensure the output of a wide range of substances meeting the needs of several industries at once:
- Pharmaceutics and medicine: production of antibiotics, vaccine preparations, hormones, vitamins, immunomodulators. Blood products, monoclonal antibodies, antitumor cytostatics, and diagnostic agents take up an important share.
- Biochemistry: industrial synthesis of enzymes, lipids, nucleotides, and pure amino acids.
- Agriculture: output of feed proteins for livestock, biological plant protection products, and safe insecticides.
- Industrial chemistry: large-tonnage production of alcohols, acetone, butanol, sugars, organic acids, and yeast.
Ecology and biosensor technologies
A special place is occupied by bioremediation — an ecological field aimed at environmental restoration (cleaning soils, water bodies, and air from pollutants). This process is implemented through two main mechanisms:
- Bioconversion — partial transformation of harmful substances by living organisms.
- Biodegradation — complete breakdown of pollutants into completely safe components.
Another innovative direction is biosensor technologies. This is the development of analytical devices for accurate indication and identification of biologically active substances (BAS) and macromolecules (e.g., nucleic acids or antigens). Their operating principle is based on recording physicochemical changes upon interaction of the detector with cells.
Examples of biosensor use:
- Immunosensors for rapid detection of the antigen–antibody complex.
- Enzyme electrodes for determining blood glucose levels (the device records the release of $CO_2$ during the enzymatic breakdown of the sugar molecule).
Strategic objectives and priority areas
Biotechnological methods are actively introduced into the food industry (e.g., fish product processing), light and chemical industries. There are four priority areas for the development of the discipline:
- Medical and pharmaceutical.
- Food.
- Agricultural.
- Environmental.
The ultimate strategic goals consist of creating highly effective therapeutic and diagnostic agents for healthcare and veterinary medicine, as well as solving the global food program. In the agro-industrial complex, this means increasing crop yields, raising livestock productivity, and qualitatively improving food products (dairy, meat, confectionery, and bakery).
Briefly: answers to topical questions
Which microorganisms are the main producers of antibiotics?
The main producers of antibiotics are three groups of microorganisms.
- Actinomycetes (Actinomycetes) — branching bacteria, predominantly the genus Streptomyces, which synthesize about 80% of natural antibiotics.
- Molds (Fungi) — representatives of the genera Penicillium (Penicillium chrysogenum) and Cephalosporium (Cephalosporium acremonium), producing natural $\beta$-lactams and fusidic acid.
- Typical bacteria — eubacteria, bacilli, and pseudomonads, synthesizing polypeptide antibiotics (bacitracin, polymyxins).
Which specific therapeutic enzymes are obtained by biotechnological methods?
The following groups of enzymes are used as additional therapeutic agents:
- Proteolytic enzymes (trypsin, chymotrypsin) — used topically for treating purulent wounds, removing blood clots, and liquefying viscous secretions.
- Nucleases (ribonuclease, deoxyribonuclease) — used as antiviral drugs.
- Fibrinolytic drugs (fibrinolysin, streptokinase, streptodornase, urokinase) — designed to destroy blood clots.
- Hyaluronidase (lydase) — catalyzes the breakdown of hyaluronic acid for the resorption of scars and adhesions.
- Asparaginase — destroys asparagine in the blood, used in hematologic malignancies.
How do immunosensors function at the physicochemical level?
At the physicochemical level, the functioning of immunosensors is based on recording changes occurring during the interaction of the detector with a biological agent. In the case of immunosensors, such an interaction is the specific antigen–antibody reaction. The device records the physicochemical shifts that arise at the moment of immune complex formation, which makes it possible to indicate biologically active substances.
Which hybridomas are used to produce monoclonal antibodies?
To produce monoclonal antibodies, hybridomas are used, which are hybrid cells created by somatic hybridization of two cell types.
- Immune B-lymphocytes (e.g., mouse splenocytes) — act as donors of the property to synthesize specific antibodies.
- Myeloma cells — tumor cells that do not produce their own antibodies, but confer the ability to divide indefinitely upon the hybridoma.
As a result of fusion, a hybridoma is formed that rapidly multiplies and produces homogeneous highly specific antibodies.
For quick memorization of the four main areas of biotechnology, use the acronym MEPS: Medical-pharmaceutical, Environmental, Food, Agricultural.
Class and exam questions
What is the difference between primary and secondary metabolites?
Primary metabolites (amino acids, vitamins) have a low molecular weight and are vital for the growth of the cells themselves. Secondary metabolites (antibiotics, hormones) are not required for basic cell growth.
What is bioremediation?
This is an ecological branch of biotechnology aimed at cleaning soils, water bodies, and air from pollutants using living organisms.
How does an enzyme electrode work when measuring glucose levels?
The sensor records physical and chemical changes in the environment—specifically, the release of carbon dioxide that occurs during the enzymatic breakdown of sugar.
What else to study on this topic
- Detailed mechanism of nucleic acid-based biosensors (DNA sensors).
- Specifics of equipment for the industrial-scale scaling of cell cultivation.
- Differences between bioconversion and biodegradation processes at the molecular level.
- Technologies for isolating immunoglobulins from animal serum and donor blood preparations.
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