Explain about the freeze drying Method, Biology

Explain about the freeze drying Method?

The Techniques of freeze-drying have been developed over the past half-century for the purpose of preserving certain biological materials, which are costly to produce, and which are highly unstable. Perhaps its most notable successes have been in the preservation of human plasma for transfusion purposes and in the preservation of the early samples of penicillin during the war. Today it has numerous applications in the pharmaceutical industry, but it falls far short of requirements for the food industry.

The cost of the process is also still too high to make it a practical proportion for many of the cheaper foods. In this method of removal of water the product is frozen and the temperature maintained below the triple point of the constituent aqueous solutions so that the water vapour can be sublimed from the frozen state. There is, therefore, a direct transfer from solid to vapour without the ice melting and passing through the liquid phase. The process is carried out under high vacuum to provide a high vapour diffusion potential and is accelerated by supplying heat in some convenient form, either radiant, conductive or from microwaves. It is generally considered that as a means of dehydration. It produces a dried product of the highest quality and therefore  is potentially an extremely attractive method.

Posted Date: 7/2/2013 3:37:57 AM | Location : United States







Related Discussions:- Explain about the freeze drying Method, Assignment Help, Ask Question on Explain about the freeze drying Method, Get Answer, Expert's Help, Explain about the freeze drying Method Discussions

Write discussion on Explain about the freeze drying Method
Your posts are moderated
Related Questions
Q What are the few examples of annelids? Earthworms, lugworms and leeches. Q. Which are the morphological features that differentiate the beings of the phylum Annelida from

Monosaccharides are frequently known as single or simple sugars and are the easiest of all carbohydrates. That is the building blocks of all higher carbohydrates. The Monosacchari

Heat Production In the Homeotherms heat production must be elevated if the ambient temperature falls below the critical temperature. Although all metabolic processes result i

During which meiosis division does ploidy reduction occur? Does ploidy reduction occur in mitosis? In the cell division by meiosis ploidy reduction occurs in meiosis II. Initia

Define the Role of Public Nutritionist in Health Care Delivery? It is clearly evident from the foregoing discussion that nutrition is an important, though not the only, determi

Difference between Ribosome and plant virus -   RIBOSOME (RNA + Protein)   PLANT VIRUS (RNA + Protein)   1. Does not mul

Define Importance of Nutrient and Drug Interaction? Certain foods, beverages, alcohol, caffeine, and even cigarettes can interact with medicines. This may make them less effect

What are mineral salts? Where in living beings can mineral salts are found? Mineral salts are simple inorganic substances made of metallic chemical elements, such as iron, sodi

A few statements about the mechanism of evolution are made. Mark the correct statements.   (i)  Evolution happens at the individual level as well as population level. (ii

Assessment and Nursing Care Plans Clustered Case Study Mr. Smith is an 83 year old gentleman (DOB 1.2.1928), who lives alone in his home on a cattle farm west of Ravenshoe.