Lecture - 14

Lecture - 14 - 1 How to prevent microbial growth. High...

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Unformatted text preview: 1 How to prevent microbial growth. High Temperature thermal death Low Temperature low (refrigeration) or very low (frozen) Remove Moisture dry Control H 2 O availability add sugar or salts pH Control add acids Oxygen add or restrict Aseptic Processing Thermal effect High Pressure Proteins denatured Pulsed Electric Field Membrane rupture Pulsed light UV/Thermal effect Ionizing radiation DNA damage Ozone Oxidation Mode of Action of Microbial Cell Destruction Mode of Action of Microbial Cell Destruction With Advanced Processing Technologies With Advanced Processing Technologies Nicolas Francis Appert Father of canning ," also was a confectioner . In 1800 , Napoleon Bonaparte offered a 12,000 franc reward to anyone who could devise a method for the food preservation in order to provide his troops with daily rations in order to keep his armies adequately supplied while on the march. After years of experimentation, Appert submitted his invention and won the prize in 1809 . 2 In 1811, Appert published a book revealing his method for preserving food. His book was called "L'Art De Conserver, pendant plueieurs annes, Toutes les Substances Animales et Vegetales" Translated, that means The Art of Preserving All Kinds of Animal and Vegetable Substances For Several years. Though the title wasnt very catchy, the book sold in abundance. His invention was a success, yet he never was able to explain why his method worked. In 1810, an Englishman named Peter Durand was granted a patent from King George III for the idea of preserving food in "vessels of glass, pottery, tin or other metals or fit materials." The British are Coming By 1813, tins of preserved food were supplying the British army and navy. The Royal Navy used as many as 24,000 large cans, nearly 40,000 pounds on its ships each year by 1818. The nutritious canned vegetables were a great relief to sailors who previously had relied on live cargo or salted meat and were often plagued by debilitating scurvy. It was believed that the salt caused the condition, when it was actually because the salt-cured foods lost most of their vitamins and nutrients in the preservation process. ONCE AGAIN THE DESIRE FOR EXPANSION AND WEALTH, and the necessities of war, broadened the popularity of the can. Manifest Destiny and the California Gold Rush of 1849 sent miners, homesteaders and trappers into the frontier. A considerable amount of provisions was needed to make the long journey across the plains and the mountainous West. Settlers traveled in wagon trains filled with supplies and herded livestock alongside their caravans. Foods canned in the East were critical for survival....
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Lecture - 14 - 1 How to prevent microbial growth. High...

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