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Water is responsible for changes in the physical, chemical and/or biological characteristics of foods. It is an important component of all biological or living systems. In fresh foods, the percentage of water varies from 60% to more than 90% (Davide and Salvatore, 2012). Water content in foodstuffs during processing, storage and distribution may lead to deterioration of aroma and degradation of nutritional substances because it supports the existence and development of micro-organisms and chemical reactions within the foodstuffs. Drying or dehydration of foods is the basic food-processing operation used to preserve foods for a long period of time. Although both terms are applied to the removal of water from food, using heat and mass transfer, drying usually refers to natural desiccation such as spreading fruit on racks in the sun; and dehydration designates drying by artificial means such as a blast of hot air.
1.1 Introduction
In this section, Design and Fabrication of Freeze Dryer is discussed, with relevant and recent citations. As a prelude to other parts of this study, this chapter will discuss the background upon which this study was initiated, the statement of problems that led to this study, the aim and objectives of the study. Others are significance of the study, scope of work, research hypothesis and questions, limitation of the study and definition of terms.
This chapter focuses on the review of related literature. A literature review presents current knowledge, as well as theoretical and methodological contributions, related to Design and Fabrication of Freeze Dryer. It documents the state of the art on the subject under study and provides a comprehensive survey of existing literature. In this research work the literature review includes the conceputal review, theoretical framework, the review of related literature …
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