body’s main source of energy. carbohydrates are produced through a process called photosynthesis ...
TRANSCRIPT
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CARBOHYDRATESBody’s main source of energy
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CARBOHYDRATE PRODUCTION Carbohydrates are produced through a
process called photosynthesis plants convert radiant energy from the sun
into chemical energy
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CARBOHYDRATE PRODUCTION
Requires carbon dioxide, water, chlorophyll, and sunlight Sunlight = energy Chlorophyll – green
pigment found only in plants
All carbohydrates in plants are produced into glucose
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STRUCTURE
Carbohydrates are molecules composed of: Carbon Hydrogen Oxygen
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STRUCTURE Basic structure is in a ring shape Hydroxyl group: oxygen atom and a
hydrogen atom bonded together Symbol: -OH Found in all carbohydrates Part of organic alcohols
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SIMPLE CARBOHYDRATES
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SIMPLEST CARBOHYDRATE: SUGAR Sugar = saccharide Monosaccharide's: sugar
containing one basic molecule to form more complex carbohydrates 6 carbon 12 hydrogen 6 oxygen Arrangement differs
Accounts for varying sweetness
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SIMPLEST CARBOHYDRATE: SUGAR
Monosaccharide's include: Glucose Fructose Galactose
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GLUCOSE
Mild sweet flavor Found in corn & grapes Known as blood sugar Essential energy source Found in every disaccharide and
polysaccharide
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FRUCTOSE
Sweetest sugar Found in fruits and honey Added to soft drinks, cereals, and
desserts
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GALACTOSE
Only found in animals & humans One of the basic sugars in milk Rarely found naturally as a single sugar
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SIMPLEST CARBOHYDRATE: SUGAR
Disaccharides: pairs of monosaccharide's Glucose is always present 2nd of the pair is fructose, galactose, or
another glucose Put together by condensation Taken apart by hydrolysis
Sucrose, Maltose, and Lactose
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SUCROSE
Glucose + Fructose Tastes sweet
Fruit, vegetables, grains Table sugar is refined sugarcane and
sugar beets White powdered color
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MALTOSE
Glucose + Glucose Less sweet Produced when starch breaks down In powder form: tan color
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LACTOSE
Glucose + Galactose Main carbohydrate in milk
Known as milk sugar Pure form: white
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CONDENSATION
Making a disaccharide Chemical reaction linking 2
monosaccharide’s Hydroxyl group + hydrogen Water molecule is a byproduct
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HYDROLYSIS
Breaking down a disaccharide Molecule is divided into smaller parts
by adding water Body uses process to digest
disaccharides in food
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HYDROLYSIS
Can be triggered by:1. Presence of an enzyme
Used in digestion Each sugar requires a different enzyme
Change –ose suffix to -ase
2. Addition of an acid3. Addition of heat
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SOURCES OF SUGAR
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SOURCES OF SUGAR1. Sugar cane
1st discovered by Chinese Granulated sugar Confectioner’s sugar Molasses
Byproduct of sugar refining Brown sugar
Either stop refining process before all the molasses is removed
Or adding molasses to granulated sugar
*tip – add a slice of bread, apple slices, or piece of lettuce to hardened brown sugar!
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SOURCES OF SUGAR
2. Sugar beets Powdered sugar, granulated sugar, and
brown sugar Cheaper costs!
3. Maple syrup 40 gallons tree sap = one gallon of maple
syrup Most pancake/waffle syrups are only 2%
maple syrup or less Use corn syrup instead
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SOURCES OF SUGAR
4. Corn syrup Processed by hydrolyzing cornstarch into
glucose
5. Honey 1st sweetener in food preparation
6. Isomalt Does not form crystals Blown and spun into sugar creations
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SUGAR IN FOOD PREPARATION
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SUGAR IN FOOD PREPARATION
1. Sweeteners Connected to molecular structure Fructose, sucrose, glucose, galactose,
maltose, then lactose The sweeter the sugar, the simpler the
structure of the molecule
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SUGAR IN FOOD PREPARATION
2. Preservatives Water is drawn to sugar before it is
drawn to bacteria Without water, bacteria can’t grow or
divide Helps products, such as cakes, stay
moist
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SUGAR IN FOOD PREPARATION
3. Tenderizers Helps make dough tender
Italian bread will have a paler color and chewier texture because it does not contain sugar
Sugar will increase the pourability of a batter
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SUGAR IN FOOD PREPARATION
4. Caramelizing Agents Caramelization: process of subjecting
sugar to high or prolonged heat, which changes into a brown liquid
Dehydration is partially responsible for the browning and flavor changes Brown crust on bread & condensed milk
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SUGAR IN FOOD PREPARATION
5. Fermenting Agents Sugar serves as a food supply for
microorganisms (yeast) to create desired change in food Examples: Yeast breads, wine, and beer
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SUGAR IN FOOD PREPARATION
6. Crystallizing Agent Linked to the solubility of sugars Sugar’s ability to dissolve increase as
temperature of solution increases Water will evaporate as solution is heated to
higher temperatures creating a supersaturated solution
Supersaturated: any solution that has been heated to dissolve more solute than the water would normally hold
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CRYSTALLIZING AGENT Factors that affect sugar crystal formation
1. Type of sugar Sucrose crystallizes rapidly with large crystals Honey or molasses added to slow crystal formation
2. Use of interfering agent Substances that can prevent or slow crystal growth Corn syrup – fine crystals Butter, cream, egg white – smooth, creamy candy Cream of tartar, vinegar – increase sweetness
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CRYSTALLIZING AGENT Factors that affect sugar crystal
formation3. Agitation of the sugar syrup
Beating and stirring of a candy solution When hot, slightly stirring increases
likelihood of crystal formation Constant stirring cooled syrup prevents
large crystals from forming
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CRYSTALLIZING AGENT Factors that affect sugar crystal
formation4. Cooling of the sugar syrup
Vital if the final texture is to be smooth Cooling rapidly produces large crystals in
candy
5. Ripening of the finished product Allowing candy to sit for a period in order
to form creamy, smooth texture Fondant
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SUGAR IN THE BODY
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NUTRITIONAL VALUE OF SUGAR
6.5% of calories should come sugar Produce 4 kilocalories per gram when
digested Absorbed into the bloodstream & heads
to the liver Converted into glucose in the liver
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NUTRITIONAL VALUE OF SUGAR
Unneeded glucose is changed into glycogen
Glycogen: multibranched chains of glucose
2/3 of glycogen stored in muscles remaining stored in the liver
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FUNCTIONS OF SUGAR IN THE BODY1. Main supply of energy
When body needs energy, single glucose is broken off a branch of glycogen
Allows for large amounts of glucose to be available quickly
Body can use 1/5 of total glycogen stores in 20 minutes during intense physical activity
2. Allows for proper digestion of fats and proteins Without sugar, toxins would build up in the blood
resulting in liver damage
3. Necessary for brain functions Increases serotonin, calming effect &
antidepressant
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HEALTH CONCERNS Tooth decay
Bacteria in mouth feed on sugar and produce plaque
Plaque reduces oxygen, which cause the bacteria to release acids that dissolve tooth enamel
Does not necessarily have to be sugar, but any food that contains carbohydrates
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HEALTH CONCERNS
Diabetes mellitus: body’s inability to move glucose from the bloodstream to the cells Insulin: hormone produced by the pancreas Do not produce enough insulin, or their
bodies fail to recognize its presence Unable to handle large amounts of sugar in
their bloodstream
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HEALTH CONCERNS
Weight gain All excess calories will be stored as fat Practice moderation Many foods high in added sugar provide
few other nutrients