Carotenoids Flashcards Preview

Nutritional Biochem > Carotenoids > Flashcards

Flashcards in Carotenoids Deck (15)
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1

what are the three most common dietary provitamin A carotenoids

1. alpha - carotene
2. beta - carotene
3. beta - cryptoxanthine

2

what carotenoid is physiologically important

lycopene

3

oranges, tangerines, and red bell peppers provide

beta - cyptoxanthine

4

egg yolks are a rich source of

1. lutein
2. zeaxanthin

5

_____ protects carotenoids from oxidation

vitamin E

6

too much vitamin E can diminish carotenoid absorption

T

7

in the enterocyte, beta - carotene is cleaved by using

beta - carotene 15,15' - monoxygenase

8

________ transcriptional expression is suppressed when retinoic acid concentrations gets too high

beta - carotene 15,15' - monoxygenase

9

what are the 3 routes of metabolism of carotenoids

1. cleaved and reduced to form retinol
2. * packaged and released from the liver in VLDL's *
3. stored in the liver's stellate cells

10

in the serum, carotenoids are transported using

VLDLs, LDLs, and HDLs

11

what is the best carotenoid free radical scavenger

lycopene

12

____ appears more effective in inhibiting neoplastic transformations than beta - carotene followed by alpha - carotene, and then lycopene

canthaxanthin

13

carotenoids suppress anti-apoptotic genes in cancer cells and activates pro-apoptiotic genes

T, inhibits 5 alpha - reductase

14

what immune enhancing functions do carotenoids provide

1. increased lymphocytes
2. enhanced natural killer cell cytotoxicity
3. stimulated neutrophil phagocytic and bacterial killing ability

15

beta - carotene supplementation can increase cancer risk in smokers, asbestos workers, and chronic alcoholics

T