Nonenzymatic β-Carotene Degradation in Provitamin A-Biofortified Crop Plants. uri icon

abstract

  • Provitamin A-biofortification, the provision of provitamin A carotenoids through agriculture, is regarded as an effective and sustainable intervention to defeat-vitamin A deficiency, representing a global health problem. This food-based intervention has been questioned in conjunction with negative outcomes for smokers and asbestos-exposed populations of the CARET and ATBC trials in which very high doses of beta-carotene were supplemented. The current notion that beta-carotene cleavage products (apocarotenoids) represented the harmful agents is the basis of the here-presented research. We quantitatively analyzed numerous plant food items and concluded that neither the amounts of apocarotenoids nor beta-carotene provided by plant tissues, be they conventional or provitamin A-biofortified, pose an increased risk. We also investigated beta-carotene degradation pathways over time. This reveals a substantial nonenzymatic proportion of carotene decay and corroborates the quantitative relevance of highly oxidized beta-carotene polymers that form in all plant tissues investigated.

publication date

  • 2017
  • 2017
  • 2017