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
Silver point extended below canal orifice -    Ultra-sonic tip -    Microtube tape: The post removal system (PRS) Trephine bur Masserann kit - Do trimming by

Explain Prosoma in details. First tagma of a cheliciform consisting of the first six segments of the body. Appendages on the prosoma are involved in locomotion and feeding. Pro

Male reproductive system of earthworm: Testis : There are two pairs of testis one on eachside of the body in 10th and 11th segments. They produce sperm mother cells. Seminal Ves


BIL E SALTS These are sodium or potassium taurocholate & glycolate. Lethocholic acid, cholic acid, deoxycholic acid & taurocholic acids are found in bile. Helps in em

What are some prophylactic measures against HIV infection? The major prophylactic measures against HIV infection are: the use of condoms in sexual relations, not to share syrin

Q. What is Low Gradient Aortic Stenosis? One may come across patients who have severe left ventricular dysfunction and modest gradients across aortic valve. This situation may

The key enzymes of gluconeogenesis,include: a)  Pyruvate carboxylase b)  Phosphoenol pyruvate carboxykinase c)  Fructose- 1,6-bisphosphatase,  and d)  Glucose-6-phosph

Define requirements of Vitamin A of infants? On the basis of vitamin A ingested by breast fed infants in well-nourished communities, ICMR (1990) has recommended a daily allowan

Q. What is the name of the DNA duplication procedure? What is the major enzyme that participates in it? The process of duplication, or copying, of the DNA molecule is called re