How many double bonds are in beta-carotene?

How many double bonds are in beta-carotene?

1.3. Carotenes (e.g., lycopene and β-carotene) are carotenoids without oxygen. Carotenoids are fat-soluble polyenes consisting of 3–13 conjugated double bonds and up to 6 carbon ring structures at one or both ends of the molecule.

Is beta-carotene A provitamin?

Beta-carotene is a type of substance called a carotenoid. Carotenoids give plants such as carrots, sweet potatoes, and apricots their reddish-violet colors. Beta-carotene is a provitamin.

What is the functional group of beta-carotene?

Carotenes (e.g., β-carotene from carrots and lycopene from tomatoes) are strictly hydro- carbons. Xanthophylls are oxygenated carotenoids, containing alcohol, carbonyl, or other functional groups. The xanthohylls, lutein, and capsanthin are widely used as colourants and nutrients in the food and animal feed industries.

What is the function of beta-carotene in plants?

Carotene protects plant cells against the destructive effects of ultraviolet light. β-Carotene is an antioxidant.

Is beta-carotene the same as vitamin A?

The human body converts beta carotene into vitamin A (retinol) – beta carotene is a precursor of vitamin A. We need vitamin A for healthy skin and mucus membranes, our immune system, and good eye health and vision. Vitamin A can be sourced from the food we eat, through beta carotene, for example, or in supplement form.

Which is better beta-carotene or vitamin A?

The advantage of dietary beta carotene is that the body only converts as much as it needs. Excess vitamin A is toxic. Toxic vitamin A levels can occur if you consume too many supplements.

What is the formula of beta-carotene?


Beta-carotene, with the molecular formula C40H56, belongs to the group of carotenoids consisting of isoprene units. The presence of long chains of conjugated double bonds donates beta-carotene with specific colors. It is the most abundant form of carotenoid and it is a precursor of the vitamin A.

Should I take beta-carotene or vitamin A?

We need vitamin A for good vision and eye health, for a strong immune system, and for healthy skin and mucous membranes. Taking big doses of vitamin A can be toxic, but your body only converts as much vitamin A from beta-carotene as it needs. That means beta-carotene is considered a safe source of vitamin A.

How much beta-carotene is too much?

Studies have used dosages ranging between 15 and 180 milligrams a day. There is no set tolerable upper intake level (UL) for beta-carotene. However, high doses or long-term use may be dangerous.

Is beta-carotene a good source of vitamin A?

Beta carotene is an important dietary compound and an important source of vitamin A. Research has linked beta carotene intake with various health benefits. Eating a diet rich in fruits and vegetables is the best way to increase your beta carotene intake and prevent disease.

How is beta carotene a provitamin and a carotenoid?

Beta-carotene is called a provitamin A carotenoid because your body can convert it to active vitamin A. Also stored in your liver, it’s a plant pigment that confers an orange or yellow color on many foods.

How much beta carotene should I take a day?

There is no Recommended Dietary Intake for Beta-carotene as there is for other vitamins. Around 5 or 6 mg a day is suggested for adults (US).

What are the risks of beta carotene supplements?

Smokers who take high doses of beta-carotene supplements have been found to be at higher risk of death due to lung cancer. There is no recommended dietary allowance of beta-carotene. The recommended dietary allowance for vitamin A varies according to gender and life stage:

Where are vitamin A carotenoids stored in the body?

Both retinyl esters and provitamin A carotenoids are converted to retinol, which is oxidized to retinal and then to retinoic acid [2]. Most of the body’s vitamin A is stored in the liver in the form of retinyl esters.