PPT-Food Spoilage and Preservation

Professor James Dooley School of Biomedical Sciences University of Ulster Coleraine Food Spoilage and Preservation Essential element of modern society Not appreciated by most individuals A changing environment requiring constant innovation. INTRODUCTION. Milk products include milk, cream, butter, frozen deserts, cheese, fermented milks, condensed & dried milk products.. The nutritional qualities of milk & milk products make the desirable foods for humans and young animals.. CONTAMINATION OF SUGARS:. Sugar products include: sucrose (cane and beet sugar), molasses, syrups, maple sap and sugar, honey and candy.. SUCROSE. : . The raw juice expressed from sugarcane may become high in microbial content unless processing is prompt.. Co-Principal Investigators - . Amber Avant. Bailey Crosby. Morgan Dandridge. Megan DeWitt. Casey Powell. Milk Spoilage . -. the point at which milk becomes unwholesome. Milk will have a bad odor . Microbial food spoilage occurs as a consequence of either microbial growth in a food or release of extracellular and intracellular(following cell . lysis. ) . enzymes in the food environment.. Signs of spoilage of different types of food:. . What Are Foods?. Foods. are . materials. (raw, processed, or formulated) that are consumed . orally. by humans or animals for . growth. , . health. or . pleasure. . . Generally, there is no limitation . CANNING. Canning.  is a method of . preserving food.  in which the food contents are processed and sealed in an airtight container.. Canning provides a typical shelf life ranging from one to five years, although under specific circumstances a freeze-dried canned product, such as canned, dried lentils, can last as long as 30 years in an edible state. Project . highlights and achievements in the field of mild preservation. June . 2017. Why. mild . preservation. ?. Traditional processing: challenge to maintain fresh quality and nutrients (e.g. retort sterilisation). CONTAMINATION OF SUGARS:. Sugar products include: sucrose (cane and beet sugar), molasses, syrups, maple sap and sugar, honey and candy.. SUCROSE. : . The raw juice expressed from sugarcane may become high in microbial content unless processing is prompt.. Project Resources. Leia Kedem, MS, RD. Jenna Smith, MPH, RD. Mary Liz Wright, MA. Nutrition & Wellness Educators. Accessing Project Manual. UI Extension website (. http://web.extension.illinois.edu. Food contamination. There are three ways which food can be contaminated:. • . physical. ;. • . chemical. ;. • . bacterial. .. Physical contamination. Physical contamination . can occur in a variety of ways at different stages of food processing and production. Some examples are:. The ability of microorganisms to grow or multiply in a food is determined by the food environment ( intrinsic environment of food) as well as the environment in which the food is stored (extrinsic environment ).. Traditional . methods . of . preservation. Traditional methods of food preservation began from the essential need to store supplies when they were plentiful and to keep the food fresh for as long as possible to last through the winter months. . . Kinetics. Growth Curve. Log CFU/ml. Optical Density. Lag. First Order Kinetics. Food microbiology is concerned with all phases. Of microbial growth (. lag,log. , stationary, death phase).Growth curves are normally plotted as the number of cells on a log scale or log10 cell number versus time.. Food spoilage Spoilage is the process in which food deteriorates to the point in which it is not edible to humans or its quality of edibility becomes reduced. It involves any change which renders food unacceptable for human consumption.