Bioprocess Engineering is defined as the process that uses complete living cells or their components to effect desired physical or chemical changes. Bioprocess Engineering deals with the design and development of equipment and processes for the manufacturing of products such as food, feed, pharmaceuticals, nutraceuticals, and polymers and papers from biological materials. Bioprocess engineering, also biochemical engineering, is a specialization of chemical engineering or Biological engineering, it deals with the design and development of equipment and processes for the manufacturing of products such as agriculture, food, feed, pharmaceuticals, chemicals, and polymers and papers from biological materials and treatment of waste water. Bioprocess engineering is a conglomerate of mathematics, biology and industrial design, and consists of various spectrums like designing of bioreactors, study of fermentors. it also deals with studying various biotechnological processes used in industries for large scale production of biological product for optimization of yield in the end product and the quality of end product. Bioprocess engineering may include the work of mechanical, electrical, and industrial engineers to apply principles of their disciplines to processes based on using living cells or sub component of such cells. High pressure processing preserves a foods natural flavour, nutrients, and other sensory properties while extending the shelf life of foods through the inactivation of microorganisms. the uniform application of this non-thermal food processing technology also provides the food industry with new products and new product development opportunities that can fully exploit the functional properties of food ingredients such as hydrocolloids, proteins, etc. This book will also be useful as a reference source to get first hand information of the subject for the people who are working in fermentation based and biotechnology based industries.