golden+rice+10 - Golden Rice: Attempting to alleviate...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
Golden Rice: Golden Rice: Attempting to Attempting to alleviate Vitamin A alleviate Vitamin A deficiency deficiency
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Vitamin A Chief functions in the body: vision, maintenance of cornea, epithelial cells, mucous membranes, skin; bone and tooth growth; reproduction, immunity Significant sources: fortified dairy products, liver (sources of retinol); spinach and other dark leafy greens, deep orange fruits and vegetables like apricots and carrots (contain ß-carotene, precursor to vitamin A)
Background image of page 2
Three forms of Vitamin A retinol retinal retinoic acid
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ß-carotene accessory pigment in plants conjugation of the molecule responsible for its yellow-orange color precursor of Vitamin A
Background image of page 4
Vitamin A Background The Chemical name for Vitamin A is Retinol In the body, vitamin A can also function in different aldehyde and acidic forms: retinal and retinoic acid All forms of vitamin A can be interconverted except for retinoic acid B-carotene which is the precursor to vitamin A and undergoes oxidative cleavage to yield two retinol compounds The biologically active forms of vitamin A (retinol and retinyl esters) are found in the meat of animals we eat. Plants contain mainly only the carotenoid precursors of Vitamin A i.e. B-Carotene. This is important to note because although B-carotenes are essentially two molecules of vitamin A, it as not as effective in the human body as vitamin A itself. 75% of preformed dietary vitamin A is usually absorbed, compared with between 5% and 50% of dietary B- carotenes and other carotenoids.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Where do we get our daily dose of vitamin A from? Fruits, vegetables, and dairy fats. Other dietary factors that influence the bioavailability of retinol from B-carotene include the amount of protein and fat in the diet and variations in digestive function. In the typical diets of people in developing countries, however, B-carotene is the predominant dietary source of vitamin A
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Absorption of Vitamin A Vitamin A is fat-soluble adequate absorption of vitamin A depends on efficient fat absorption
Background image of page 8
Consequences of Vitamin A Deficiency Vision defects Growth retardation Cell Differentiation blocked Reproduction delayed/blocked Immunity compromised
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
World’s leading cause of preventable blindness At the beginning of the 21 st century, an estimated 124 million were affected by VAD Is responsible for 1-2 million deaths, 500,000 cases of irreversible blindness and millions of cases of xerophthalmia annually; half of them dying within 12 months of losing their sight. Nearly 600,000 women die from childbirth-related causes each year, the vast majority of them from complications which could be reduced through better nutrition, including provision of vitamin A. Prevalent in developing countries, especially those in Africa and Southeast Asia
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/19/2011 for the course ESPM 192 taught by Professor Lindow during the Fall '10 term at University of California, Berkeley.

Page1 / 44

golden+rice+10 - Golden Rice: Attempting to alleviate...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online