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Protein - PowerPoint PPT Presentation


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Protein People Need Protein Build & Replace Cells Growth Three Categories of Proteins Structural Control Body Processes Food Proteins Structural Proteins Protein in the Body Hair Nails Tissue Blood Cells Red Blood Cells Replaced Every 3-4 months Control Body Processes

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Presentation Transcript
people need protein
People Need Protein
  • Build & Replace Cells
  • Growth
three categories of proteins
Three Categories of Proteins
  • Structural
  • Control Body Processes
  • Food Proteins
protein in the body
Protein in the Body
  • Hair
  • Nails
  • Tissue
  • Blood Cells
red blood cells
Red Blood Cells

Replaced Every

3-4 months

slide7

Control

Body Processes

processes in the body
Processes in the Body

Hormones

Enzymes

Chemical

Reactions

Chemical

Messengers

examples
Examples
  • Meat
  • Milk
  • Eggs
  • Nuts/Legumes/Grasses
slide11

Protein molecules contain:

Carbon

Hydrogen

Oxygen

Nitrogen

slide12

Protein molecules are very large.

macromolecules

50% dry weight of cell

slide13

Amino Acids

Building Blocks of Proteins

22 total

8 essential

14 synthesized by body

essential amino acids
Essential Amino Acids
  • The Amino Acids that cannot be made in your body.
  • You must get them from the food you eat.
slide16

Carboxyl Group

-COOH

Amine Group

-NH2

CH base

slide17

Amino Acids make up:

DNA & RNA

Muscle Tissue

Hormones

slide19

Polypeptide

Protein molecule with many peptide bonds

slide20

Shortest polypeptide 20 amino acids

Most contain 100 - 500

Longest contains 1000’s

slide22

Amino Acids are Polar

Can form hydrogen bonds

denaturation
Denaturation
  • Process that changes the shape of a protein molecule without breaking the covalent bonds in the protein molecule.
  • Breaks the hydrogen bonds that make the protein coiled.
means of denaturation
Means ofDenaturation
  • Heat
  • Freezing
  • Whipping
  • Chemical (acid, metal ions)
coagulation
Coagulation
  • The changing of a liquid to a
    • Semi-solid clot
    • Solid mass
protein in food

Oil

Water

Protein

Protein in Food
  • Emulsifier

Fat

Soluble

Water

Soluble

foams

Air Bubble

Protein

Foams
  • Protein surrounds air bubbles created when the liquid is whipped.
examples31
Examples
  • Meringue
  • Whipped Cream
tips for making good foams
Tips for Making Good Foams
  • Fast Whipping
  • Room Temperature
  • No Fat
  • 4.6 – 4.8 pH
sugar in foams
Sugar in Foams
  • Add after foam forms.
  • Stabilizes the foam.
  • Adds flavor.
gluten
Gluten
  • Protein in flour.
  • Gives bread its final shape and structure.
  • Makes dough smooth and elastic.
gelatin
Gelatin
  • Protein that forms a colloidal dispersion in hot water.
  • Does not dissolve.
  • When cooled forms a solid.
slide36
Eggs
  • Protein Food
  • Contain all vitamin and minerals we need except vitamin C.
storing eggs
Storing Eggs
  • Coated with mineral oil
  • CO2 escapes pH, becomes watery.
  • Store in carton or covered.
protein classifications
Protein Classifications
  • Complete
  • Incomplete
slide43

Excess:

Weight Gain

Cannot gain amino acids back

slide44

Deficiencies

Stunted Growth

Slow Healing

Kwashiorkor

energy
Energy

4 cal/g

daily intake
Daily Intake

10%

Of Food Intake

slide47

Protein

Does A Body

Good