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DISPOSABLE BIOREACTORS
Two-compartment bioreactors combine high cell density yields with an easy-to-use design for optimum biomanufacturing results.
The use of disposable cell culture systems for the manufacturing of biological products in mammalian cells is advantageous because it facilitates minimization of necessary validation efforts, as well as circumvention of up-front sterilization and subsequent cleaning steps. For research-scale applications, culture systems typically used are tissue culture flasks, roller bottles, or spinner bottles, and 1 to 50 mg of proteins in total volumes up to 2 L are produced . In biopharmaceutical development or for manufacturing of antibody-based diagnostics, a scale-up of production to reach protein yields of 50 to 1,000 mg is often necessary.
For volume scale-up, increasing the number of cell-culture disposables is cumbersome because handling-time and space requirements increase accordingly, inevitably resulting in higher manufacturing costs. A more economic solution is provided by bag-based disposable systems, available in working volumes of up to 500 L, providing an alternative to stainless steel bioreactors. However, working with bag-based bioreactors requires capital investment in specific equipment and trained personnel.
Another possibility is to use disposable two-compartment bioreactors that allow production of recombinant proteins in a highly concentrated form. The two-compartment technology has been widely adopted in recent years, as it does not require any additional investment in specific equipment and can be easily handled by staff experienced with standard cell-culture systems.
FOCUS ON CHITIN AND CHITOSAN
Chitin
Chitin is the second most abundant natural biopolymer in the world, behind only cellulose. It is also the most abundant naturally occurring polysaccharide that contains amino sugars. This abundance, combined with the specific chemistry of Chitin and its derivative Chitosan , make for the array of potential applications.
Chitin occurs as a component of crustacean shells, insect exoskeletons, fungal cell walls, microfauna and plankton. It is found in association with proteins and minerals such as calcium carbonate. Different sources of Chitin differ somewhat in their structure and percentage of Chitin content.
Cellulose is a homopolymer, while Chitin and Chitosan are heteropolymers.
The major source of raw material is shells of crabs or lobsters (shellfish discards) and products that can be produced are Chitin , Chitosan and cartenoproteins. The major countries for shrimp culture / capture are China, India, Vietnam, Brazil, Ecuador and Thailand.
Not every unit of naturally occurring Chitin is acetylated; about 16% are deacetylated.
Chitosan
Chemical name of Chitosan : 2-amino-_-1,4-glucose-polymer
Molecular formula ::(C6H11O4N)n
Chitosan, is the deacetylated product of Chitin Chitosan is also known as soluble Chitin .
Generally, about 80% of the units are deacetylated, with the remaining 20% acetylated. These values can vary with Chitin sources and with processing methods.
Chitosan has decomposability, good membrane forming state, biocompatibility, antifungal and antitumour function. Chitosan enjoys high reputation as a kind of multipoly saccharide.
Most commercial applications use which is the deacetylated derivative, Chitosan , rather than Chitin
This article further discusses the following details:
• Specification
• Application
• Application Development
• Imports and Exports
• Indian Scenario
• Demand Drivers
• Manufacturing Process
• Yield
• Global Scenario
• Major producers in China
• Price
• Technology source
• Process of heterogeneous deacetylation of Chitin and/or Chitosan in soft conditions
• Chitin from Potatoes
• Future Scenario
• Location Requirement
• Raw Material
GLUCOSAMINE FROM CHITIN
D-Glucosamine Hydrochloride is a derivative that is made from natural chitin. It is a white crystal powder, optically active, odourless and somewhat sweet..
The D-glucosamine Hydrochloride has good antibacterial and antiphlogistic function. It is sweet but will not increase blood sugar. As additive for medicine preparations, example for mixed with antibiotic, it can improve diffusion and absorption, and decrease side-effect of the latter.
Commercially Glucosamine is available in the form of Glucosamine Hydrochloride and Glucosamine sulphate
In this article, following details are provided :
• Specification
• Product application
• Manufacturing Process
• Global Scenario
• Chinese Producers
• Global Price
• Indian Producers
• Import/Export details
STATUS OF STEM CELL RESEARCH
As of now, the three broad applications of stem cells are:
* They provide deeper insights into embryonic development.
* They can cure such debilitating diseases as Parkinson's, Alzheimer's or diabetes; and
* They can aid pharma companies in early stage screening of drugs, thus cutting on costs and bringing life-saving drugs to the market faster.
Given the huge disease burden, the need for organs, affordable diagnostics and medicines, the promise that stem cells offer needs to be exploited to the fullest. However, there are pitfalls, in the form of false claims, unethical methods to get quick results or unregulated practices to harvest these 'miracle' cells. In India,strict guidelines need to be put in place to put stem cells research on a strong footing.
Overall, research efforts by the scientific community or industry are still at modest levels, though a few major groups are working in specific areas. As early as 2001, Reliance Life Sciences and National Centre for Biological Sciences, Pune, had built up facilities to preserve seven and three stem cell lines respectively.
This article further described the following details
• All India Institute for Medical Sciences (AIIMS)
• Centre for Cellular and Molecular Biology (CCMB)
• Clone Derived Calls
• Foetus Cells
• Questionable scientific claims
• International Policy Initiatives
APPROVAL SYSTEM FOR BIOTECH PRODUCTS - FDA'S APPROACH
In drug manufacturing, R & D now accounts for 25 percent of industry expenses - and it takes years to bring up new production site to full capacity.
While Food and Drug Administration (FDA) ,USA may be receiving fewer applications for truly innovative therapies, many of the applications filed involve more complex products that require high-level expertise for appropriate evaluation. Manufacturers also are submitting hundreds of investigational new drug applications (INDs) and thousands of manufacturing supplements, adding to the agency's workload.
The remedy lies in establishing a system that rewards manufacturers for adopting modern processing and testing approaches and for submitting information to FDA that documents such efforts.
This article discusses the following details :
• Good manufacturing practice
• QbD approach
• Generic version of Biotech Therapies
• Review process
DIOXIN REMOVAL: TECHNOLOGY FOR REMOVAL OF DIOXINS FROM GASES
There are a number of technologies available for removing or destroying dioxins from gases,such as baghouse filters and catalysts.The investment and/or running costs of these technologies are usually high.
Adiox (patent pending) is a new dioxin removal technology that has established itself as an efficient and economic way to reduce dioxin emissions and is marketed and sold by Gotaverken Miljo AB as material deliveries, package units or turn key flue gas treatment systems.
Adiox is an innovative technology for removing toxic dioxins from gases. Tower packings, droplet separators and fixed bed fillings can be made of this dioxin absorbing material.
The use of this novel technology under wet and dry conditions is discussed.
COURTESY:Filtration + Separation,December 2005
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• Chemicals Imported at Chennai Port During the Month of October 2005
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