Beta-cryptoxanthin from citrus juices: assessment of bioaccessibility using an in vitro digestion/Caco-2 cell culture model

Br J Nutr. 2007 May;97(5):883-90. doi: 10.1017/S0007114507670822.

Abstract

Beta-Cryptoxanthin (beta-CX), a provitaminic carotenoid of potential interest for health, is found principally in Citrus fruit in both free and esterified forms. Little is known about the intestinal absorption of beta-CX especially with regard to the esterified forms. The aim of this study was to evaluate the absorption of free and esterified beta-CX using simulated digestion coupled with the Caco-2 model. Bioaccessibility was investigated by measuring the transfer of carotenoids from different citrus juices into micelles using an in vitro digestion system. Then, carotenoid uptake was evaluated by adding carotenoid-rich micelles (from the in vitro digestion) or synthetic micelles (made from synthetic lipids and carotenoids purified from citrus juice) to human intestinal cells (Caco-2 TC7 clone). Our results showed that beta-cryptoxanthin esters (beta-CXE) were partially hydrolysed during the in vitro digestion. The bioaccessibility of free beta-CX measured was significantly higher (40 (SD 1.05) %) than that of beta-carotene (30 (SD 1.9) %) and beta-CXE (16 (SD 1.5) %). In the same way, the incorporation of free beta-CX (27 (SD 1.01) %) into synthetic micelles exceeded (P<0.05) that of beta-carotene (10 (SD 0.7) %) and beta-CXE (8.8 (SD 0.4) %). In the case of micelles from in vitro digestion, the uptake of beta-carotene, free beta-CX and beta-CXE forms by Caco-2 cells was 14.3 (SD 1.8), 3.9 (SD 1.3), and 0.7 (SD 0.08) % respectively. These results showed a preferential uptake by Caco-2 cells of beta-carotene and free beta-CX compared with the two esters of beta-CX.

MeSH terms

  • Anticarcinogenic Agents / pharmacokinetics*
  • Beverages*
  • Biological Availability
  • Caco-2 Cells
  • Citrus / chemistry*
  • Citrus sinensis
  • Cryptoxanthins
  • Digestion / physiology*
  • Humans
  • Intestinal Absorption / physiology
  • Laurates / pharmacokinetics
  • Micelles
  • Models, Biological
  • Myristates / pharmacokinetics
  • Xanthophylls / pharmacokinetics*
  • beta Carotene / pharmacokinetics

Substances

  • Anticarcinogenic Agents
  • Cryptoxanthins
  • Laurates
  • Micelles
  • Myristates
  • Xanthophylls
  • beta-cryptoxanthin laurate
  • beta-cryptoxanthin myristate
  • beta Carotene