ANSC/FSTC 607 Physiology and Biochemistry of Muscle as a Food Muscle as Meat

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1 I. Protein in the diet A. Function ANSC/FSTC 607 Physiology and Biochemistry of Muscle as a Food Muscle as Meat 1. To provide amino acids, not protein. Quality grades and nutrition 2. To prevent protein breakdown, diet must contain essential amino acids plus enough amino groups to make nonessential amino acids. B. Definitions 1. Limiting amino acid the essential amino acid found in shortest supply relative to amounts needed for protein synthesis. Glu Glu-Phe-Ala- Ala - Lys Phe Asp Phe Ala Asp-Ala-Glu-etc. Glu mrna 2. Complete protein protein containing all amino acids essential in human nutrition in amounts adequate for human use. 3. Complementary proteins two or more proteins whose amino acid assortments complement each other so that missing essential amino acids in one are provided by the other(s). 4. High-quality protein easily digestible, complete protein. 5. Digestibility amount of amino acids absorbed per amount of protein intake. 6. Reference protein egg protein, used by FAO/WHO as standard. II. Protein Quality A. Depends on essential (indispensable) amino acid composition. B. Evaluation 1. Chemical score CS = Content of each indispensable amino acid in food protein Content of same amino acid in reference protein (e.g., egg) 1

2 a. Amino acid with lowest score is first limiting amino acid, etc. b. More useful when compared to reference pattern for age group. 2. Biological value BV = Intake - (F - F o ) - (U - U o )/I - (F - F o ) x 100 BV = (nitrogen retained/nitrogen absorbed) x 100 Where: Intake = nitrogen intake; F = fecal nitrogen; F o = fecal nitrogen on nitrogen-free diet; U = urinary nitrogen; U o = urinary nitrogen on nitrogen-free diet a. Measure of nitrogen retained for growth and/or maintenance. b. Proteins exhibit greater BV when fed below maintenance levels. 3. Net protein utilization NPU = I - (F - F o ) - (U - U o )/I a. Measures retention of food nitrogen rather than absorbed nitrogen. b. Takes into account digestibility of food proteins (also = BV x digestibility). Amino acids as a percent protein in foods Protein food Lysine Sulfur AAs Threonine Tryptophan Leucine CS BV NPU Ideal (for preschool child) Egg, 12.8% protein Cow milk, 3.5% protein Ground beef, 10% protein Chicken, 20.6% protein Soybeans, 34.9% protein Black beans, 23.6% protein Lentils, 25.0% protein Cornmeal, 9.2% protein Oatmeal, 14.2% protein Spirulina plankton Collagen Digestibility of food proteins Food Digestibility of protein(%) Eggs 97 Meat, poultry, fish Milk 81 Wheat Corn 90 Soybeans 90 Other legumes

3 III. Vitamins in meat Name Major Deficiency RDA Dietary Toxicity Coenzyme functions symptoms sources Thiamine Thiamine pyrophosphate Riboflavin FAD and FMN Niacin NAD + and NADP + Pantothenic acid Coenzyme A Biotin Biocytin Vitamin B 6 Pyridoxal phosphate Folate (folic acid) THFA Vitamin B 12 Cobalamins Vitamin C Ascorbic acid Coenzyme in glycolysis Coenzymes in TCA and ETS Coenzymes in glycolysis, TCA, ETS, ß- oxidation TCA, ß- oxidation Gluconeogenesis Amino acid metabolism DNA, RNA, amino acid synthesis Folate metabolism, gluconeogenesis Collagen synthesis Beriberi, nerve tingling Inflammation of mouth, eye disorders Pellagra, diarrhea Fatigue, headache, nausea Dermatitis, anemia Headache, anemia Anemia, diarrhea, mental disorders Anemia, poor nerve function mg Sunflower seeds, pork, grains, beans mg Milk, mushrooms, spinach mg Mushrooms, bran, tuna, chicken, beef, peanuts 4-7 mg Mushrooms, liver, broccoli, eggs µg Cheese, egg yolks, peanut butter mg Animal protein foods, spinach, µg broccoli Green leafy vegetables, organ meats 2 µg Animal foods, especially organ meats Scurvy 60 mg Citrus fruits, strawberries, broccoli None possible from food. None reported. Flushing of skin at > 100 mg. None. Unknown. Nerve destruction at > 100 mg None. None. Doses > 1-2 g cause diarrhea. IV. Fat in meat marbling and added fat A. Relationship between muscle lipid content, fiber type and meat quality 1. Greater lipid content = greater flavor desirability. 2. Greater lipid content implies greater marbling content. 3. Higher marbling scores associated with a greater percentage of ß-red myofibers. B. Location of adipose tissues 1. Subcutaneous, which underlies the skin. Originates as brown adipose tissue in some species. 2. Intermuscular, which separates whole muscles. Also known as seam fat. 3. Intramuscular (marbling), which is located between muscle fiber bundles. Also known as interfascicular adipose tissue. 3

4 3. Abdominal, which occurs within the abdomen of animals. Invariably originates as brown adipose tissue. 4. Pericardial, which is found within the chest cavity. Also originates as brown adipose tissue. RELATIONSHIP BETWEEN PERCENTAGE OF FAT in the longissimus muscle and mean flavor desirability ratings for loin and top round steaks of various maturities. Quality grade Actual intramuscular fat (%) Mean flavor desirability ratings Loin steak Top round steak A A, B, C, E A A, B, C, E Prime or more Prime 10.0 to Prime- 9.0 to Choice+ 8.0 to Choice+ 7.0 to Choice 6.0 to Choice- 5.0 to Select+ 4.0 to Select 3.0 to Standard+ 2.0 to Standard 1.0 to Standard- 0.9 or less C. Marbling in U.S. livestock 1. Only grain-fed cattle and pigs marble well. 2. Maximum fat percentage in beef is approximately 12%. 3. Most beef contains 3 5% total fat within the muscle (and less for pork). D. Beef cattle production in Japan, Korea, and China 1. Japan, Korea, and China produce cattle with the same genetic background. 2. The genetics migrated from China to Korea to Japan. 3. Japan, Korea, and China feed their cattle for a very long period of time (19 months or more past weaning), using high-grain diets to increase marbling. 4. One beef breed type in Japan (J. Black or Wagyu), Korea (Hanwoo), and China (Yellow cattle) contributes to high-quality beef production. 4

5 Diagram and photomicrographs of fat cells. (upper left) Diagram of a typical fat cell. (upper right) Photomicrograph of bovine subcutaneous fat cells. (lower left) Intermuscular bovine fat cells surrounding an artery. (lower right) Intramuscular bovine fat cells arranged longitudinally between muscle bundles. U.S. Choice Beef (7% IML) American Wagyu Beef (25% IML) 5

6 Quality grades and nutrition Japanese Black bull in the Osaka region Young Geisha in training Angus and Wagyu steers in the U.S. Chinese Yellow bull in Yangling, China Hanwoo bulls in Korea Chinese beef promotion (Snow Beef) 6

7 V. Biochemical and compositional differences between U.S. and Asian beef A. Marbling distribution 1. In U.S. beef, marbling adipocytes are found only in small strands within the perimyseum. 2. In Wagyu beef, marbling adipocytes totally surround myofibers (steatosis). Angus Longissimus Muscle Histology Wagyu Longissimus Muscle Histology B. Percentage intramuscular lipid 1. Marbling (intramuscular lipid) increases until about 20 mo of age in U.S. cattle, although subcutaneous adipose tissue increases indefinitely with age or body weight. 2. Intramuscular lipid increases indefinitely in Wagyu cattle, although s.c. fat increases only slowly. 30 b Percentage intramuscular lipid B BHo BBHo RBHo CBHo NBHo Slaughter age, d 7

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