Food Science

1. Food Science Ag Processing Technology Unit 1 Agriscience: Fundamentals and Applications Unit 33

2. Objective • To explore the nutrient requirements for human health and the processes used in food science to ensure an adequate and wholesome food supply

3. Introduction • Food: a material containing or consisting of carbohydrates, fats, proteins, and supplementary substances such as minerals • This unit is to explores the foods that humans need to maintain health and sustain growth and how those foods reach our tables from their beginings as raw products

4. Reading Assingment • Read p. 639-643 (Stop at Food Customs of Major World Populations)

5. Food Customs of Major World Populations • Availability of food and technology to prepare that food dictates eating habits • What are the eating habits of these major world populations • Asia • Mexico • United States

6. Methods of Processing, Preserving and Storing Food • Oldest ways are fermenting and pickling • Controlled fermentation is used to produce • Cheese, wines, beers, vinegars, pickles, sauerkraut

7. Primary Objective of Processing and Preserving • Change raw commodities into stable forms • Due to refrigeration and various processing techniques we now expect almost all foods to be available at any time during the year • But do they always taste as good?

8. Slowing Deterioration • Tomatoes and cucumbers that will be sold raw are waxed to retard shriveling while they are in the grocery store • Apples are treated with decay inhibitor • Grapes are fumigated with sulfur dioxide to control mold • Silos where grain is stored are purged with 60% carbon dioxide to control insects • Carbon dioxide inhibits the growth of bacteria and is used in the process of controllled atmosphere, an example is the preservation of lettuce—it is transported in a controlled atmosphere to keep the edges from turning brown • Humidity should also be controlled for optimum storage

9. Other Ways of Slowing Deterioration • Refrigeration • Blanching • Canning • Dehydration • Freeze-drying • Oxidative deterioration • Dehydrofreezing • Irradiation

10. Packaging That Can Improve Shelf Life • Cardboard Boxes • Molded Pulp trays to prevent bruising • Plastic wraps • Retortable pouches provide protection from light, heat, mouisture and oxygen transfer • Flexible, consist of two layers of film with a layer of foil between them • Benefits—increased shelf life (1-2 years)

11. Potatoes • Potatoes are offered up to us in a variety of ways • Raw • Fried • Frozen • Cooked & canned • Dehydrated • We are going to dehydrate our own potatoes and then compare them (taste, texture, look, etc) to raw, fried, frozen and cooked & canned potatoes.

12. Food Additives to Enhance Sales of Food Commodities • Processing may reduce the natural nutritional value of the product • To compensate for that loss vitamins and minerals are added back in to restore nutritional value • Sugar is the most widely used food additive.

13. Reading Assingment • Read Food Preparation Techniques

14. Food Products From Crops

15. Food Products from Crops • Food from plants help meet body requirements for food in four of the five food groups

16. Fruits, Vegetables, Nuts • Nearly ready to eat at harvest • Processing can be as simple as picking, washing and eating or the foods may take a journey through many processes

17. Cereal Grains • Compose the major diet of the world • Economical to process because they can be left on the plant until nearly dry • However, each year much of the worlds food grain is lost due to rotting in the field, improper storage, birds, insects and rodents • WHY???? • Grain processing means separating or milling the grain in to its basic parts- hulls, bran, flour and germ • These components are then used to make cereal, bread, pasteries, pasta and thousands of other products

18. Oil Crops • Soybeans, cottonseed, peanuts, rape, palm nuts, coconuts, olives and corn are all rich in vegetable oils • These oils are used for cooking, frying, baking, and for other food products such as dressings, coffee creamers, shortening • Also used to make industrial products such as paints, laquers and plastics • Seeds, nuts and other oil rich parts are crushed or ground and heated • The oil is extracted by solvents and purified for food and industrial uses • The meal is dried and ground and used for livestock feed • See fig. 33-15 on p. 651

19. Food Products From Animals

20. Food Products From Animals • Meats • Fish • Poultry • Dairy

21. Dairy Products • 37% of milk consumed in the US is in the fluid form • Remainder is used to make cheese, butter, frozen foods, dried whole milk, cottage cheese, evaporated milk and condensed milk

22. Milk and Milk Products • Major componenets • Water • Fat • Protein • Sugar • minerals

23. Milk and Milk Components: Water • Makes up 88% of fluid milk • Water is the carrier for disolved, suspended and emulsified components

24. Milk and Milk Componenets: Protein • Milk provides a substantial portion • Predominante protein: casein • Casein is found only in milk • Makes up about 82% of the milk protein • Exsists in suspended form and is easily coagulated by the action of acids and enzymes • High quality • Contain all the essential amino acids in proper balance for good nutrition

25. Milk and Milk Components: Milk Fat • Concentrated sources of energy • Many different fats that give milk its distinctive, pleasing flavor • High in fat soluable vitamins- A,D, E, K

26. Milk and Milk Components: Lactose • Major carb of milk • Makes up ½ the nonfat solids in milk • Relative sweetening power of lactose is about 1/6th that of sucrose (common table sugar)

27. Milk and Milk Components: Minerals • Contains 7 major minerals and several in minor and trace amounts • Calcium and phosphorus • Essential to human nutrition for building bones and certain metabolic processes • Milk is the chief source of calcium in the diet in the US • Phosporus is contained in the same biological relationship to calcium as occurs in the growing skeleton • Recommended daily amounts of dietary calcium can not be met without using milk

28. Milk and Milk Components: Vitamins • All vitamins required by humans are found in milk • Some are fat soluable and are associated with butterfat, those that are water soluable are found in the non-fat portion of milk • Vitamin A and carotene are present in high concentrations • Carotene gives milk its color • Vitamin D content of fresh milk is low • Commercially pasteurized milk is fortified with Vitamin D to balance the product for optimum nutrition • Abundant source of riboflavin (Vitamin B2) • Important source of niacin because it is in fully available form • Significant amount of thiamine (Vitamin B1), biotin, vitamin B12, folic acid, choline

29. Processed Milk Products • Fluid milk • sold pasteurized for safety and homogenized to keep the milk fat in suspension • Whole milk is sold with 3.5% milk fat • 2%, 1% and non-fat (skim) milk are also available • Fortified (A & D) milk is also sold • Cream • Component of milk that contains up to 40% butterfat • Butter is made from cream • Made by concentrating the fat portion of the milk by running it through a seperator • Whipping cream is 40% fat, table cream 18-20%, Half and Half approx. 12%

30. Processed Milk Products • Ice cream, ice milk and sherbet • Nonfat dried milk • Used for humans and animals • Often used in dairy and other food products • Cheese • Made by exposing milk to certain bacterial functions or by exposing it to enzymes • Both methods coagulate some of the proteins found in milk • Many types and varieties of cheese

31. Processed Milk Products • Cottage Cheese • Made from skimmed milk • Condensed and evaporated milk • Both are canned • Produced by removing large portions of water from whole milk using a vacuum pan • Condensed milk is further treated by adding sugar • This makes condensed milk important to the baking and ice cream industries

32. Meat Products • Beef • Lamb • Pork • Poultry • Fish • Game • All are processed by slaughtering the animal and then dressing the animal for market purposes

33. Beef Slaughtering Process • Render the animal insensible • This is done to comply with the Humane Slaughter Act of 1958 • Several methods of accomplishing this • Single blow • Gunshot • Electrical current • Carbon dioxide gas • After the animal is insensible to pain it is shackled, hoisted and stuck in a large artery to permit bleeding • The head may also be removed during or following the bleeding • Removal of the hide is next. It is cut open at the midline of the belly and a mechanical hide puller pulls the hide off in one piece. • The Breast and rump bones are also split at this time by sawing

34. Beef Slaughtering Process • All the internal organs or viscera are removed, except for the kidneys • All USDA regulated plants must inspect the carcass and the viscera to confirm good health • Next the hide is split down the center of the backbone and washed with warm water • The carcasses are then shrouded and cooled for a minimum of 24 hours before the carcass is ribbed and further processed

35. Aging Beef • To age or ripen means to leave the carcass undistrubed for a period of time while the beef cools. • Fresh beef is not in its most tender state immediately following slaughter so aging allows the natural biological changes to occur that change muscle to meat • 3 methods of aging • Traditonal • Fast • Vacuum Packaging • Time, temperture and technology help define these three methods

36. Selling Beef • Sold in three ways • Block beef • Shipped in exposed halves, quarters or wholesale cuts to be cut into retail cuts at the supermarket • Meat is ready for sale over the “block” or counter • This method creates concern over sanitation, shrinkage, spoilage and discoloration • Fabricated boxed beef • Carcass is divided into smaller cuts, vacuum sealed, boxed, moved into storage and shipped to retailers • Processed meats • Scraps that are not suitable for sale over the block. • These meats have the bones removed and are sold as boneless cuts. They are also canned, made into sausage, dried or smoked.

37. Sheep • Rendered insensible and bled • Front feet, pelt, head, hind feet are removed • Carcass is opened and eviserated • Because a lamb carcass is small the front legs are folded at the knees and held with a skewer • Washed and cooling procedures are similar to those used with beef

38. Hogs • Rendered insenible • Shackled and hoisted and bled • Carcass is then plunged into 150 degree water for 4 minutes to loosen the hair • The carcass is then dehaired by a dehairing machine • The hog is then returned to the rail where it is washed and singed and the head is removed • Next the carcass is opened, eviscerated and split • Leaf fat is removed • Leaf fat is the fat inside the body • It is used to make lard which is used in cooking and baking • Kidneys and facing hams are inspected • Carcass is sent to a 34 degree cooler

39. Poultry • Bird is secured to a conveyor belt and bled • Next the animal is scalded and then picked • After picking the bird is singed to remove the fine hairs that cover the bird under the feathers • Bird is washed, eviscerated and the giblets are cleaned • Bird is then cooled to 40 degrees usually with ice

40. Fish • Processing procedure depends on the type of fish • Evisceration, scaling and head removal along with washing and cooling all occur • Process really depends on how the fish is to be consumed • For example: • Tuna can be left whole or cut up and processed • Shell fish like crab and lobster are kept alive until cooking

41. Game • Processing begins in the field • Same basic processing procedure is followed • Most are processed by hunters or small hometown lockers instead of big processing plants • Large game is processed in a fashion similar to cattle • Fowl are dressed in a fashion similar to poultry

42. Kosher Slaughter • Kosher: right and proper • Based on the religious ritual of the Jewish faith • Animals must be killed by a rabbi or specially trained repersenative • Methods and time by which the meat must be sold are based on ritual that relates to concern for sanitation • Meat must be consumed quickly and neither packers or retailers can hold kosher meat for more than 216 hours (9 days) • Washing of the meat is required every 72 hours

43. Major Cuts of Meat • Different areas of the animal are useful for different purposes • See fig 33-22, 33-23, 33-24 • Quizzes • Learn the Major cuts of meat for beef, pork and lamb • Use the worksheets and this book to help you study • Quiz 1 will be on the beef on January 30 • Quiz 2 will be on the lamb on February 6 • Quiz 3 will be on the pork on February 13

44. By-Products • All parts of the animal are not edible • Dressing percentage is a term used to indcate the percentage or yeild of hot carcass weight to the weight of the animal on foot • Offal is removed from the live animal to arrive that the dressing percentage • Formula: hot carcass weight divided by the live weight of the animal • For example: HCW= 900 lbs LW= 1500 • 900/1500= 0.6 or 60% DP

45. What happens to the offal?XXXX • Accounts for many products that are used daily and can be divided into 12 categories • Hides • Fats • Variety Meats • Hair • Horns and Hooves • Blood • Meat Scraps • Bones • Intestines and Bladders • Glands • Collagen • Contents of Stomach

46. Hides • Leather products • Shoes • Harnesses • Saddles • Belts • Clothes • Sporting Equipment • Hats • Gloves

47. Fats • Oleomargarien • Soaps • Animal feeds • Lubricants • Leather dressing • Candles • fertilizers

48. Variety Meats • Heart, liver, brains, kidneys, tongue, cheek meat, tail, feet, sweetbreads (thymus and pancreatic glands), tripe (pickled rumen) are sold over the counter as variety or fancy meats

49. Hair • Artists brushed • Toothbrushes • Paint brushes • Mattresses • Upholstery • Air filters • Baseball mits

50. Horns and Hooves • Carving medium • Fashioned into decorative knives, umbrella handles, goblets, combs and buttons