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Nutrition: Chapter 13 -most B-Vitamins
Thiamin, Riboflavin, Niacin, Pantothenic Acid, Biotin, B-6, Folate
84
Biology
Undergraduate 2
03/15/2010

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Term
Food source of Thiamin
Definition

FOOD SOURCES:

Pork

Sunflower Seeds

Legumes

Term
Functions of Thiamin
Definition

FUNCTION:

Carb, branch-chain AA and pentose metabolism

Synthesis of Ach

Helps with RNA synthesis

Term
Absorption of Thiamin
Definition
In jejunum by a carrier-mediated system
Term
Transport of Thiamin
Definition
By RBC in blood
Term
Storage of Thiamin
Definition
Poorly stored in liver and muscle. Much excess is excreted in urine.
Term
Thiamin RDA
Definition

Men = 1.2 mg/day

Women = 1.1 mg/day

Term
Thiamin DV
Definition
1.5 mg/day
Term

Thiamin

Average Intake

Definition
1.2-2.0 mg/day
Term

Thiamin 

Upper Limit

Definition
NO UL
Term
Thiamin Deficiency
Definition

Beriberi

Wernicke-Korsakoff

Term
Thiamin deficiency that causes peripheral neuropathy within 7 days of deficiency.
Definition
Beriberi
Term
Symptoms of Dry Beriberi
Definition

Weakness

Nerve degeneration

Irritability

Poor arm/leg coordination

Term
Symptoms of Wet Beriberi
Definition

edema

enlarged heart

heart failure

Term
Thiamin deficiency prevalent in alcoholics
Definition
Wernicke-Korsakoff
Term
Symptoms of Wernicke-Korsakoff
Definition

Involuntary eye movement

Blurred vision

Staggering

Poor muscle coordination

Mental Confusion

"Drunken Stupor"

Term
Food sources of Riboflavin
Definition

FOOD SOURCES:

Milk

Eggs

Enriched grains/meat

Term
Factor that breaks down riboflavin in food rapidly.
Definition
Exposure to UV Light
Term
Functions of Riboflavin
Definition

FUNCTIONS:

Energy metabolism

Antioxidant

Activation of Folate, Niacin, B-6 and Vit. K

Term
Digestion of Riboflavin
Definition
HCl in stomach releases riboflavin from bound form.
Term
Absorption of Riboflavin
Definition

Increases with intake

 

Low intake: Active or facilitated transport

High intake: passive absorption

Term
Transport of Riboflavin
Definition
Via protein carrier in blood
Term
Storage of Riboflavin
Definition
Small amount stored in liver, excess is excreted.
Term

Riboflavin

RDA

Definition

Men = 1.3 mg/day

Women = 1.1 mg/day

Term

Riboflavin

Daily Value

Definition
1.7 mg/day
Term

Riboflavin

Upper Limit

Definition
No UL
Term
Riboflavin Deficiency
Definition
Ariboflavinosis
Term
At risk for Riboflavin deficiency
Definition

Alcoholics

Drug users

Avoidance of milk-products

Term
Consequences of Ariboflavinosis
Definition

Glossitis

Cheilosis

Seborrheic Dermatitis

Stomatitis

Eye disorder

Throat Disorder

Nervous System Disorders

Term
Food sources of Niacin
Definition

FOOD SOURCES:

Poultry

Meat

Fish

Mushrooms

Enriched Grains

Term
Two forms of Niacin
Definition

Nicotinic Acid

Nicotinamide

Term
NE =
Definition
Niacin equivalents
Term
Functions of Niacin
Definition

FUNCTIONS:

Participate in at least 200 reactions

Glycolysis

Krebs Cycle

ETS

Alcohol Dehydrogenase

Fatty Acid Synthesis

Term
Absorption of Niacin
Definition
In stomach and SI via active transport and passive diffusion. Almost all is absorbed, but bioavailability effects use.
Term
Transport of Niacin
Definition
Transported from liver to all tissues where it is converted to coenzymes.
Term
Storage of Niacin
Definition
No storage, excess is excreted in urine.
Term

Niacin

RDA

Definition

Men = 16 mg/day

Women = 14 mg/day

Term

Niacin

Daily Value

Definition
20 mg/day
Term

Niacin

Upper Limit

Definition
35 mg/day
Term

Niacin

Average Intake

Definition
Exceeds RDA in US
Term
Niacin Deficiency
Definition

Diarrhea

Dementia

Dermatitis (Pellagra)

Term
Only dietary deficiency disease that reached epidemic proportions in US. Can occur within 50-60 days and prevented with adequate protein diet.
Definition
Pellagra : Niacin deficiency
Term
Niacin Toxicity
Definition

Flushing of Skin (Niacin flush)

Itching

Nausea

Liver Damage

Term
Food Sources of Pantothenic Acid
Definition

FOOD SOURCES:

Meat

Milk

Vegetables

Term
Functions of Pantothenic Acid
Definition

FUNCTIONS:

Aid metabolism

Donate Fatty Acids to proteins

Fatty Acid elongation

Term

Pantothenic Acid

RDA

Definition

No RDA

No UL

Term

Pantothenic Acid

Adequate Intake

Definition
5 mg/day
Term

Pantothenic Acid

Daily Value

Definition
10 mg/day
Term
Pantothenic Acid deficiency
Definition

RARE:

Burning foot syndrome

Listlessness

fatigue

headache

sleep disturbance

nausea

abdominal distress

Term
Absorption of Pantothenic Acid
Definition
As free form in SI
Term
Storage of Pantothenic Acid
Definition
Minimal amounts as CoA in liver.
Term
Food sources* of Biotin
Definition

FOOD SOURCES:

Cauliflower

Egg yolk

Liver

Peanuts

Cheese

 

*Also synthesized in colon.

Term
Function of Biotin
Definition

FUNCTIONS:

Add CO2 to carboxylase reactions

Allow amino acid breakdown

Term

Biotin

RDA

Definition

No RDA

No UL

Term

Biotin

Adequate Intake

Definition
30 micrograms
Term

Biotin

Daily Value

Definition
300 micrograms
Term
Absorption of Biotin
Definition
In SI as biocytin
Term
Storage of Biotin
Definition
Small amounts are stored in liver, brain and muscles. Excess is excreted via bile and urine.
Term
Biotin Deficiency
Definition

RARE;

Caused by lack of biotinase and excessive raw egg consumption.

 

Also at risk are alcoholics and those using anticonvulsants

Term
Biotin deficiency symptoms
Definition

Skin rash

Hair Loss

convulsions

neurological disorders

impaired growth in kids

Term
Vitamin B-6 Food Sources
Definition

FOOD SOURCES:

Meat

Fish

Poultry

Potatoes

Fortified cereals

Term
Vitamin B-6 RDA
Definition

Women = 1.3 mg/day

Men = 1.7 mg/day

Term
B-6 Daily Value
Definition
2 mg/day
Term
B-6 Upper Limit
Definition

100 mg/day

(can cause permanent nerve damage)

Term
Functions of B-6
Definition

FUNCTIONS:

Make hemoglobin

Metabolism

Synthesis

Enzymatic reactions

Helps make Niacin

Immune Function

Term
B-6 Deficiency
Definition

RARE:

 

Anemia

Seborrheic Dermatitis

Convulsion

Depression

Confusion

Nerve Damage

Decreased immune response

Increased homocysteine

Coronary Artery disease

Term
At risk for B-6 deficiency
Definition

Alcoholics

Anemics

medication reactions

Term
Pharmacological uses for B-6
Definition

Carpal tunnel

PMS

Nausea during pregnancy

Term
B-6 Absorption
Definition
passive, phosphorylated in liver, bound to albumin
Term
B-6 storage
Definition
Liver and muscle, excreted in urine.
Term
Food sources of Folate
Definition

FOOD SOURCES:

Liver

Legumes

Leafy greens

Term
Folate RDA
Definition
400 micrograms/day
Term

Folate 

Daily Value

Definition
400 micrograms/day
Term

Folate

Upper Limit

Definition
1 mg
Term
DFE
Definition
Dietary Folate Equivalents
Term
DFE equation
Definition
[(Total synthetic folate) x 1.7] + total folate intake in food
Term
OTC limit of folate for adults
Definition
400 micrograms/tablet
Term
OTC folate limit for pregnancy
Definition
800 micrograms/tablet
Term
Factors that affect folate sensitivity
Definition
Heat, oxidation and UV light
Term
Folate absorption
Definition

As monoglutamate with help of folate conjugase.

 

Absorption increases with intake:

Low intake = active absorption

High intake = passive absorption 

Term
Transport of folate
Definition
Via portal vein to liver where it is converted to polyglutamate form.
Term
Functions of Folate
Definition

THFA involved in DNA synthesis

Amino Acid metabolism

Neurotransmitter Synthesis

Term
Folate deficiency
Definition

Megaloblastic anemia

Neural Tube defect

Term
Storage of folate
Definition
In liver and excess excreted in feces and urine.
Term
Niacin Equivalents
Definition

60 mg tryptophan =1 mg niacin

 

1 gr of protein = 10 mg tryptophan

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