PPT-Microbial spoilage of foods

Cause of spoilage Spoilage may be due to one or more of the following 1 Growth and activity of microorganisms 2 Insects 3 Action of the enzymes of the plant or animal food 4 Purely chemical reactions ie those not . 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.. 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. Varun. . Pathak. School of Biomedical Sciences,. University of Ulster,. Coleraine. Hunter-Gatherer society. supported low numbers/ self-sufficient. unreliable food supply. limited specialisation of individuals. 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:. 1. 41. Copyright © McGraw-Hill Global Education Holdings, LLC. Permission required for reproduction or display.. Microbial Growth and . Food . Spoilage. Results . from growth of microbes in food. alters food visibly and in other ways, rendering it unsuitable for . http://. www.learnalberta.ca/content/kefs/index.html. food safety. http://. www.youtube.com/watch?v=1EkehFkhWf4. youtube. - We will We Will Rock you. http://. www.youtube.com/watch?v=32x65e9zTYo&feature=related. 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. 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:. By . Dr. Abhishek Thakur. (Assistant Professor). College of Fisheries, Kishanganj. BASU, Patna. Subject: Fish Canning Technology. Date of Lecture: . 22.06.2020 & 06.07.2020. Food Spoilage. Food spoilage can be defined as . 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 ).. . MILK AND MILK PRODUCTS . Raw . milk contains many types of microorganisms coming from different sources. The average composition of cow’s milk is protein 3.2%, carbohydrates 4.8%, lipids 3.9%, and minerals 0.9%. Besides casein and . 1. Temperature. 2. . PH. 3. . Water activity. 4. . Oxygen and redox. Temperature. Minimum Temperature. . The temperature below which no growth occurs.. At temperature below the minimum the properties of cell membranes change so that they can no longer transport materials into the cell. 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.. Spoilage of food can occur through:. . 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..