Color When Beef Steak Is Cooked

Meat Science and Nutrition

Meat Colour

The post mortem color development of meat varies greatly from ane species to some other, with variations in fresh beefiness existence very prominent. Beef shows a range of colour from first being cut to the end of its shelf life (virtually three days).

Typical meat colour for different species is shown in Table 3.

Table 3 Typical colour of meat from different species

Species	Color
Beef	Bright blood-red cherry
Fish	Pure white to grayness-white or pink to dark red
Horse	Dark blood-red
Lamb and mutton	Calorie-free red to brick ruddy
Pork	Greyish pinkish
Poultry	Grey-white to dull scarlet
Veal	Brownish pinkish

Meat color is meaning to consumer credence of products. The bright red colour of skilful quality beef, sockeye salmon, and young lamb are naturally appealing, whereas the paler colours of veal and other fish species are less highly-seasoned to many (although more sought afterward by some ethnic groups). Nighttime meats such equally horse are more popular in Quebec and European countries. Mutton (sheep over 12 months of age with darker flesh) appeals to an fifty-fifty smaller range of customers.

Factors Affecting Colour

Use of Muscles

Poultry provides a good opportunity to come across and learn about the differences in meat color. Meat cutters and cooks may often be asked why dissimilar parts of a chicken accept and other parts take , or why duck or game birds have by and large dark meat.

The color of the meat is determined by how the muscle is used. Upland game birds, such as and grouse, that fly only for short bursts take white breast meat. In contrast, ducks and geese and almost other game birds that fly long distances have exclusively dark meat. In domestic poultry (chickens and turkeys), there is a difference between breasts (white meat) and thighs and drumsticks (dark meat).

Note: Chicken thighs, even when fully cooked, may take a reddish tinge and blood seepage from the thigh bone. This is normal; notwithstanding, inexperienced customers may interpret this equally a sign of not being cooked properly.

Proteins

Meat colour is associated with 2 proteins: (in the musculus) and (in the blood). When animals are no longer alive and air comes in contact with the meat, myoglobin reacts with oxygen in an attempt to reach a land of equilibrium, at which betoken no further changes occur. As this process happens, the meat color goes through three stages and three colours that are like shooting fish in a barrel to see, particularly on freshly cut beef meats.

1. Purplish red (myoglobin): occurs immediately afterward a is sliced.
2. Red cerise (oxymyoglobin): occurs several minutes after cutting and after exposure to oxygen.
3. Brown (metmyoglobin): occurs when the iron in the myoglobin is oxidized, which normally takes about three days after cutting. (You may see steaks with this colour in the discount bin at a supermarket. The brown colour doesn't mean there is anything wrong with the product; in fact, purchasing meat at this stage is a great fashion to stock upward on cheaper steaks for the freezer.)

Oxygen

Oxygen plays two important roles, which affect the color in opposite means. As presently equally meat is cut, oxygen reacts with the myoglobin and creates the bright red colour associated with oxymyoglobin. This will go along to develop until the atomic number 26 in the myoglobin oxidizes to the indicate of the phase.

Oxidation can also occur when iron in the meat binds with oxygen in the muscle. This can oftentimes occur during the processing of round steak from the hip cardinal and can be identified past the rainbow-similar colours that appear from the reflection of light off the meat surface. The condition volition remain afterwards the production is cooked and tin can frequently exist seen on sliced roast beef used in sandwich making. This condition does not change the quality of the meat; still, information technology is generally less bonny to consumers.

Age

The pale muscles of veal carcasses signal an young animal, which has a lower myoglobin count than those of more mature animals. Immature cattle are fed primarily milk products to proceed their flesh light in colour. However once a calf is weaned and begins to consume grass, its flesh begins to darken. Intact males such as breeding bulls have muscle that contains more myoglobin than females (heifers) or steers (castrated males) at a comparable historic period.

More often than not, beefiness and lamb have more than myoglobin in their muscles than pork, veal, fish, and poultry. Game animals accept muscles that are darker than those of domestic animals, in part due to the college level of physical activity, and therefore they also have college myoglobin.

Preventing Discolouration

Maintaining the temperature of fresh meat near the freezing bespeak (0°C/32°F) helps maintain the bright red color () of beef meats for much longer and prevents discolouration.

Meat should be immune to bloom completely (the bloom usually reaches its peak about 3 or four days later cutting) or exist wrapped on a meat tray with a wrapping picture show as in supermarket meat displays. If portioned steaks are to be vacuum packed, doing so immediately later cutting (simply before the bloom has started) volition allow the steaks to bloom naturally when removed from the vacuum packaging.

Certain phases of meat processing can likewise trigger discolouration. Oxidation browning (metmyoglobin) can develop more chop-chop than normal if something occurs to restrict the flow of oxygen once the bloom has started but has not been allowed to run its full grade. The two most common examples are:

• Cut meat surfaces stay in contact also long with flat surfaces such every bit cut tables, cutting boards, or trays.
• Meat is wrapped in paper (which means there is no further exposure to air and therefore no oxygen, which speeds upward the browning issue).

The browning effect will occur naturally once the meat is exposed to oxygen.

In that location are 2 other types of discolouration that commonly occur with beef and pig meat. Although the crusade of both types occurs before death (), the actual modify does not testify up until later decease (mail service mortem). The discolouration is a result of chemical reactions in the animal's torso due to stresses, known equally .

PSS can event in two different types of discolouration: PSE and DFD.

(stake, soft, and exudative) occurs mainly in pigs (and in some cases has been found to be genetic). PSE is brought about past a sudden increment of lactic acid due to the depletion of glycogen before slaughter, which in turn causes a rapid decline in the pH postal service slaughter. The visible signs of PSE can be detected past the trained eye in the pork loin primal, where the flesh appears much paler than normal. The muscle meat is softer and may be very sloppy and wet to the touch and leaking meat juices, a result of a high proportion of free water in the tissues.

Although product with PSE is safety to eat, its shelf life is limited and it may become tougher sooner if overcooked. Products with PSE have limited use equally fresh products merely are used to manufacture cooked products such as formed ham and certain sausage varieties with a recommended limit of 10% (i.eastward., ane part PSE to nine parts of regular meat), due to the high h2o content.

(dark, firm, and dry) occurs mainly in beefiness carcasses only sometimes in lamb and turkey. In the meat industry, these carcasses are referred to as . Unlike PSE meat, DFD meat shows little or no drop in the pH after slaughter. Instead, at that place may be an increase of stress hormones, such every bit , released into the bloodstream. Consequently, (musculus sugar) is depleted before slaughter due to stresses. This decreases the lactic acid, which in turn affects the pH, causing it to not drop fast enough after slaughter. Therefore, the musculus meat, typically in the hip surface area of the carcass, may become very dry and dark.

Even afterwards the carcass is aged and the meat has been candy and displayed, the night advent remains and blossom will not occur. In add-on, the meat may besides feel sticky to the touch, which limits shelf life. DFD meat is by and large considered unattractive to the consumer; all the same, the meat remains edible and is still suitable for use in cooked products and sausage emulsions simply should be limited to 10% (one part DFD to ix parts of regular meat).

Listed below are some causes of DFD that should be avoided:

• Transferring animals to foreign environment (kill found) and holding them for too long
• Treating animals roughly prior to and during transport (eastward.thousand., using cattle prods)
• Overcrowding cattle during shipping
• Mixing cattle with other animals they are not used to
• Preventing animals from having sufficient residuum at the slaughterhouse prior to harvesting
• Dehydrating animals (not giving them enough water) prior to slaughter
• Causing over-excitement, pain, hunger, excessive racket, smell of blood
• Exposing animals to temperature extremes during transportation
• Aircraft stress-susceptible animals, such equally intact males (bulls), during severe conditions

Annotation: DFD can occur anywhere betwixt 12 and 48 hours prior to an animal's slaughter.

Imperfections and Abnormalities in Meat

Fifty-fifty though meats arriving at their final destination (betoken of sale) accept usually been approved and inspected, the product yet requires farther checks prior to sale and eating in example abnormal meat inconsistencies were missed in the inspection process. Some of these are acquired by injuries or affliction that occurred while the beast was live, while others are naturally occurring parts of the animate being's body (glands in particular) that are removed prior to or during the cutting procedure.

Some examples are given here.

• and : infected or non-infected tumours from onetime injuries that are imbedded in muscles and sometimes close to bones (Figure 9).

Figure 9. Cyst in beef short loin.

• : usually from more than recent injuries and too found imbedded in muscles or betwixt muscle seams or on or near bone joints.
• : scar tissue, usually from very old injuries, with the appearance of white fat seams or thin strands tightly bound together, making the musculus tough and unsightly.
• and : lymph nodes are glands in the throat and dorsum of the tongue that requite a good indication of the general health of the animal; these are inspected on the animal carcass at the harvesting plant prior to being sold, but internal or intermuscular glands are not examined unless further inspection is recommended past a veterinary. Consequently, iii major glands are removed from beef, pork, and lamb during processing to ensure the public do not see them. They are the , located in the neck and blade sub-primals beneath the junction of the fifth cervical vertebra (Effigy x); the , located at xc degrees to the round bone on the hip on the exterior of the sirloin tip imbedded in the cod fatty pocket (Figure 11); and the , located in the outside round sub-primal in the hip primal between the eye of the circular and the exterior circular flat under the heel of round, imbedded in a fat pocket (Figure 12).

Figure 10. Prescapular gland.

Figure 11. Prefemoral gland.

Figure 12. Popliteal gland.

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Source: https://opentextbc.ca/meatcutting/chapter/meat-colour/

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