Retinol Equivalence of Plant Carotenoids in Children

Vitamin A Deficiency Clinical Trial

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00082420
• Other study ID #: RETEQ (completed)
• Secondary ID: DK60021
• Status: Completed
• Phase: N/A
• First received: May 6, 2004
• Last updated: January 12, 2010
• Start date: September 2004
• Est. completion date: November 2005

Study information

• Verified date: January 2010
• Source: National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
• Contact: n/a
• Is FDA regulated: No
• Health authority: United States: Federal Government
• Study type: Observational

Clinical Trial Summary

To determine vitamin A value of beta-carotene in oil capsule, spinach, and golden rice.

The experiments will be conducted in children (ages 7-9) with/without adequate vitamin A nutrition. As plant provitamin A carotenoids are a major and safe vitamin A source for a vast population in the world, it is essential to determine the efficiency of provitamin A carotenoid (mainly ß-C) conversion to vitamin A. By introducing ß-C into rice endosperm, Golden Rice may directly benefit consumers by providing vitamin A nutrition. Our investigation uses hydroponically grown, deca-deuterium labeled spinach and Golden Rice, synthetic ß-C-d10 and a vitamin A isotope reference, deca-deuterated retinyl acetate (RAc-d10), to evaluate the bioavailability and the bioconversion of plant provitamin A carotenes to retinol as compared with ß-C in oil capsules in vivo.

Our objectives will be to test the following hypotheses and to make the following determinations: (1) The absorption and bio-conversion of provitamin A carotenes taken by children are different between spinach, Golden Rice, and ß-C in oil capsules. (2) The absorption of provitamin A carotenes and their bioconversion to vitamin A are different in children with or without adequate vitamin A nutrition. (3) To define the vitamin A equivalence(s) of dietary spinach, Golden Rice, and a ß-C in oil dose by using an isotope reference method in children with or without adequate vitamin A nutrition and to compare those values with values derived from model based compartmental analysis. (4) To determine the number and time of blood samples needed for future studies in various field settings on the retinol equivalence of a large number of plant sources.

This study will be of importance in planning vitamin A deficiency prevention strategies and also will provide useful information regarding the potential efficacy of a bioengineered crop to provide vitamin A nutrition.

Description:

Seventy-two children each will take two meals, lunch and supper, containing equal amounts of ß-C in labeled spinach (along with white rice), or Golden Rice (along with light colored vegetables), or ß-C oil capsules (along with white rice and light colored vegetables), every day for 7 days. Before the two meals, the volunteers will take a breakfast with a RAc-d10 dose as a reference for 7 days. The enrichment of labeled ß-C and labeled retinol in human circulation will be determined using advanced liquid chromatography / mass spectrometry and gas chromatography / mass spectrometry. Through the applications of these novel technologies, we will be able to determine the relative biological activities of endogenous carotenoids; that is, the vitamin A value of spinach, Golden Rice, and ß-C in oil capsules for children with/without vitamin A malnutrition.

Other known NCT identifiers

• NCT00072696

Recruitment information / eligibility

• Status: Completed
• Enrollment: 32
• Est. completion date: November 2005
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Both
• Age group: 7 Years to 9 Years

Eligibility

Inclusion Criteria:

• 7-9 years old

Exclusion Criteria:

• Parasitic infection

Study Design

Observational Model: Case-Only

Related Conditions & MeSH terms

• Night Blindness
• Vitamin A Deficiency

Locations

Country	Name	City	State
n/a

Sponsors (1)

Lead Sponsor	Collaborator
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)

References & Publications (2)

Lei Li, Yin Wang, Jieshu Wu, Ranfeng Zhu, Xianfeng Zhao, Zhixu Wang, Shi-an Yin. Biefficacy of ß-carotene in Chinese children with marginal and normal vitamin A status (in Chinese). Hygiene Research, 2007;36(5):547-551.

Lei Li, Yin Wang, Shi-an Yin, Michael A Grusak, Robert M Russell, Guangwen Tang. Bioconversion of spinach ß-carotene in Chinese children with noemal or marginal vitamin A status. FASEB J. 2006 20:A1319