Spoilage of Heated and Canned Foods

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SPOILAGE OF HEATED CANNED FOODS | PRODUCT | CAUSE OF SPOILAGE | MICROORGANISMS INVOLVED | HEATED CANNED FOODS | Chemical Spoilage1. Hydrogen Swell-increasing acidities of the food-increasing temperatures of storage-imperfections in the tinning and lacquering of the interior of the can-a poor exhaust-presence of soluble sulfur and phosphorus compounds2. Interaction between the steel base of the can and the contaminated food-discoloration of the inside of the can-discoloration of the food-production of off-flavors in the food-cloudiness of liquors or syrups-corrosion or perforation of the metal-loss in Nutritive Value Biological Spoilage1. Survival of organisms after the administration of the heat treatment2. Leakage of the container after the heat process permitting the entrance of organisms.3. Recontamination4. Lack of heat processing5. Poor Evacuation | THERMOPHILIC SPORE-FORMING BACTERIAFlat Sour Spoilage-Bacillus- in low-acid foods-B. coagulans- acid foodsTA. Spoilage-Thermophilic anaerobe not producing hydrogen sulfide-Clostridium thermosaccharolyticum- thermophilic spore-forming bacteria anaerobe that forms acids and gas in foodsSulfide, or “Sulfur Stinker,” Spoilage-Desulfotomaculum nigrificans- spores of this bacterium have considerably less heat resistance than those of flat sour and TA spoilageMESOPHILIC SPORE-FORMING BACTERIAMesophilic Clostridium Species-C. sporogenes, C. putrefaciens and C. botulinum- are proteolytic or putrefactive. Decomposing proteins with the production of malodorous compounds.-putrefactive anaerobe- produce CO2 and H2 causing the can to swell; spores are heat resistant; grow best in the low-acid canned foods-Saccharolytic clostridia- -C. pasteurianum- spoilage in acid foods-C. botulinum- cause of food poisoning Mesophilic Bacillus Species-Bacillus spp.- heat resistance; spoiled in poorly evacuated cans-B. subtilis, B.

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