Category: Family and Home > Food and Cooking
Asked by: jbeau-ga
List Price: $5.00
12 Oct 2005 06:02 PDT
Expires: 11 Nov 2005 05:02 PST
Question ID: 579289
I would like to know who invented the freeze drying process (for foods) and when it was invented. Thanks.
Re: Freeze Drying
Answered By: answerfinder-ga on 12 Oct 2005 06:59 PDT
Dear jbeau-ga, The use of machines to freeze food and then withdraw the moisture is known as lyophilization. Freeze drying by natural process was apparently known to the Peruvian Incas of the Andes who stored their food in the high mountains of the Andes. Doctor Thomas A Jennings has written a detailed book on this subject and he has contributed to an article on inventors.about.com. He writes that ?there is no real invention of a freeze-dryer. It appears to have evolved with time from a laboratory instrument that was referred to by Benedict and Manning (1905) as a "chemical pump". Shackell took the basic design of Benedict and Manning and used an electrically driven vacuum pump instead of the displacement of the air with ethyl ether to produce the necessary vacuum. It was Shackell who first realized that the material had to be frozen before commencing the drying process - hence freeze-drying. The literature does not readily reveal the person who first called the equipment used to conduct this form of drying a "freeze-dryer".? http://inventors.about.com/library/inventors/blfrdrfood.htm If you go to amazon.com you can read several pages of his introduction to his book where he gives further details of the history of lyophilization. Lyophilization: Introduction and Basic Principles (Hardcover) by Thomas A. Jennings This is the main amazon page but use the link further below to access the introduction where you can read the historical review on pages 1 to 4. http://www.amazon.com/gp/product/1574910817/103-1476473-0577420?v=glance&n=283155&no=%2A&s=books&v=glance http://www.amazon.com/gp/reader/1574910817/ref=sib_fs_top/103-1476473-0577420?%5Fencoding=UTF8&p=S00N&checkSum=wnAmxPVCvvH7q6LdYWFIYUXVDe9MmxMl1XlZbA5MBy8%3D#reader-link The book makes reference to two patents. You can view these by going to the US Patent Office and typing in their number in the Patent Number Search section of the Issued Patents (PatFT). http://www.uspto.gov/patft/index.html I hope this answers your question. If it does not, or the answer is unclear, then please ask for clarification of this research before rating the answer. I shall respond to the clarification request as soon as I receive it. Thank you answerfinder Search strategy "freeze drying" invented ://www.google.co.uk/search?hl=en&q=%22freeze+drying%22+invented&spell=1
|jbeau-ga rated this answer:|
|There are no comments at this time.|
If you feel that you have found inappropriate content, please let us know by emailing us at email@example.com with the question ID listed above. Thank you.
|Search Google Answers for|