provitamin A


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pro·vi·ta·min A

trivial name for carotenoids exhibiting qualitatively the biologic activity of β-carotene, that is, vitamin A precursors (α-, β-, and γ-carotene and cryptoxanthin); contained in fish liver oils, spinach, carrots, egg yolk, milk products, and other green leaf or yellow vegetables and fruits.

pro·vi·ta·min A

(prō'vī'tă-min)
Carotenoid precursors of vitamin A found in some red and yellow fruits and vegetables.
References in periodicals archive ?
Moisture contents of subjected 17 (16 provitamin A biofortified + 1 local check) maize hybrids at the time of harvesting were estimated using moisture meter (Dickey John MULTIGRAIN) and further drying experiment was conducted to attain the moisture contents ranging 10-12%.
Analysis of variance and Tukey HSD All-Pairwise treatment mean comparisons for different quality traits of provitamin A biofortified maize hybrids
Most sweet potato found in sub-Saharan Africa contains very little provitamin A. Biofortified, vitamin A-rich orange sweet potato (OSP) has been promoted since 2006 by international organizations, including the CGIAR.
Similarly, the researchers found that compared to a raw carrot meal without avocado, the addition of one avocado significantly increased (12.6 times) the conversion of provitamin A to vitamin A.
The first study investigated if fresh avocado, when eaten with high beta-carotene tomato sauce, would promote the absorption of provitamin A carotenoids, and the conversion of these carotenoids to an active form of vitamin A.
Researchers at the University of London Royal Holloway Hospital (School of Biological Sciences, Biochemistry Division, Egham, Surrey TW20 0EX, England, U.K.) have engineered a tomato plant that contains altered proportions of carotenoids--specifically, elevated levels of beta-carotene provitamin A carotenoid.
The tables of selected food sources of vitamin A suggest animal sources of vitamin A and plant sources of provitamin A carotenoids (18).
Targets were set such that for preschool children 4-6 years old and for non-pregnant, non-lactating women of reproductive age, iron-biofortified beans and iron-biofortified pearl millet would provide approximately 60% of the Estimated Average Requirement (EAR) for iron; zinc-biofortified wheat and zinc-biofortified rice would provide 60 to 80% of the EAR for zinc; and provitamin A biofortified maize, cassava and sweet potato would provide at least 50% of provitamin A.
Professor Peter Beyer from Freiberg University in Germany, together with researchers at the International Center for Tropical Agriculture (CIAT) in Colombia studied a naturally arising variant of cassava with yellow roots in order to understand the synthesis of provitamin A carotenoids, dietary precursors of vitamin A.
The first provitamin A biofortified maize variety was approved for release in Zambia in 2012, eight years after plant breeding activities started at the International Maize and Wheat Improvement (CIMMYT) and International Institute of Tropical Agriculture (IITA) under funding from the HarvestPlus program.
The first variety of provitamin A cassava was approved for release in Nigeria in late 2011, eight years after crop development activities were initiated in 2003 at the International Center for Tropical Agriculture (CIAT) and the International Institute of Tropical Agriculture (IITA) under funding from the HarvestPlus program.