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Vitamins B6, B12, and Folate
Wardlaw's Perspectives in Nutrition
46
Health Care
Undergraduate 3
11/07/2012

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Term
B6 is a family of 3 compounds-
Definition
Pyridoxal, pyridoxine, pyridoxamine
Term
All of the B6 compounds can be converted to coenzyme known as
Definition
Pyridoxal Phosphate (PLP)
Term
B6 as PLP plays a coenzyme role in more than ______ enzymatic reactions in human cells
Definition
100
Term
Which vitamin plays a role in the synthesis of Heme, which is part of larger molecule Hemoglobin
Definition
B6
Term
How does PLP affect blood glucose?
Definition
PLP helps maintain blood glucose by assisting in the release of glucose from glycogen
Term
PLP is required for synthesis of neurotransmitters like
Definition
Serotonin, dopamine, norepinephrine, GABA, etc
Term
Which vitamin assists with the formaiton of the B-vitamin Miacin from the amino acid tryptophan
Definition
B6
Term
Sources of B6
Definition
Muscle tissues of animals (so meat, fish, poultry) as well as whole grains, peanut butter, garbanzo beans, and breakfast cereal
Term
Why is whole wheat not as satisfactory a source of B6
Definition
A lot of B6 is lost in the refining process
Term
Symptoms of B6 deficiency
Definition
Dermatitis, anemia, convulsions, depression
Term
What two syndromes have been historically treated with B6 supplements?
Definition
Carpal tunney syndrome and PMS
Term
High doses of B6 can cause
Definition
Irreversible nerve damage
Term
How is PLP essential to the metabolism of amino acids?
Definition
It is the coenzyme for the transaminaiton reaction that transfers amino groups to allow synthesis of nonessential amino acids
Term
Folate comes from the latin word
Definition
Folium meaning leaf
Term
Folate is also known as
Definition
Folic acid and folacin
Term
All forms of folate are converted to its basic coenzyme
Definition
Tetrahydrofolic acid (THFA)
Term
Term folic acid refers to
Definition
Synthetic form of vitamin found in supplements and fortified food
Term
Folate is required for the
Definition
Synthesis and maintenance of new cells
Term
Folate coenzymes are critical for the synthesis of _____ and amino acid metabolism
Definition
DNA and also neurotransmitter function
Term
Folate participates in the give and take of ______-carbon groups
Definition
Single
Term
Sources of folate
Definition
Liver, legumes, dark leafy greens, fortified breakfast cereals
Term
Food processing can destroy ___-____% of folate in food
Definition
50-90%
Term
Who is susceptible to deficiencies of folate
Definition
Alcoholics (with absorption problems) and pregnant women (who have increased needs) , and cancer patients
Term
Megalobastic (or Macrocytic) Anemia
Definition
Large immature red blood cells formed from folate deficiency
Term
Folate participates in red blood cells creations because
Definition
Folate is needed for DNA metabolism and red blood cells have a lifespan of only 120 days so we they are rapdily made. No folate=deformed red blood cells
Term
Any cell that requires frequent rejuvenation or recreation will be affected by a _________ deficiency
Definition
Folate
Term
Folate deficiency can affect the gut why?
Definition
Folate is required in the the rejuvenation of gastrointestinal tract
Term
Folate made of 3 parts
Definition
Pteridine, para-aminobenzoic acid (PABA) and 1 or more molecules of the amino acid glutamic acid.
Term
Folate helps prevent nerual tube defects like
Definition
Spina Bifida and Anecephaly
Term
Chemical name of B12
Definition
Cyanocobalamin or Cobalamin
Term
"Cobal" in cobalamin refers to the fact that Vitamin _____ contains the mineral ______
Definition
B12; Cobalt
Term
In food, B12 is bound to _______
Definition
Protein
Term
R-protein
Definition
Protien, produced by slaavary glands, that enhances the absorption of B12 possibly by protecting the vitamin during its passage through the stomach
Term
What happens to B12 in the mouth?
Definition
It is coated with R-protein produced by salivary glands and then travels to the stomach attached to a protein
Term
What happens to B12 in the stomach?
Definition
HCI and pepsin release it from a protein. It binds with R-protein, and pariatel cells secrete intrinsic factor
Term
Intrinsic factor
Definition
the substance in gastic juices that enhances vitamin B12 absorption
Term
What happens to B12 in the small intestine?
Definition
Trypsin from the pancreas releases R-protein from B12. Vitamin 12 links with intrinsic factor
Term
What happens to B12 in the ileum?
Definition
B12/intrinsic factor complex is absorbed into blood and binds to transport protein trascobalmin II
Term
What happens to B12 in the liver?
Definition
Stored there
Term
What is the overall need of B12
Definition
2.4 micrograms daily
Term
Does the body store up large or small stores of B12. As a result, do deficiencies take a long or short amount of time to develop?
Definition
Large stores means long time to develop
Term
What is the function of B12 as a coenzyme
Definition
It helps move one carbon units. It works with folate and converts the folate coenzyme back to its active form
Term
Sources of B12
Definition
Bacteria fungi, algae. Meat, poulty, seafood, and eggs, and dairy products
Term
Deficiencies of B12 cause a disease called
Definition
Pernicious anemia
Term
Symptoms of pernicious anemia include
Definition
Macrocytic anemia (like folate), nerve degeneration, severe mental problems, serious medical problems and death
Term
Special risk for B12 deficiencies
Definition
Vegans and babies of vegan breastfeeding moms. Also, old people
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