Ascorbic acid revision questions - week 10 Flashcards
1
Q
Food source
A
citrus fruits, papayas, strawberries, broccoli, potatoes, green
2
Q
Absorption
A
- in SI
- active transport
- dehydro-ascorbic acid; facilitated diffusion, reduced to ascorbic acid
- 70-90% absorbed between 30-100mg
3
Q
transport
A
-in blood
4
Q
Storage
A
- pituitary gland, adrenal glands, WBC, eyes, brain
300-400 at all times
5
Q
excretion
A
- filtered by kidneys and excreted via urine
- rapid excretion in urine above 100mg/day
- conserved in kidneys when in short supply
6
Q
Coenzyme form
A
ascorbic acid
7
Q
main function
A
- collagen synthesis, some antioxidant capabilities, hormone and neurotransmitter synthesis, oxidation - reduction reactions
8
Q
RDI
A
45mg
9
Q
UL
A
1g
10
Q
Toxicity
A
diarrhea and other GI tract problems
11
Q
Deficiency
A
scurvy - poor wound healing, pinpoint, hemorrages, bleeding gums
