Zinc Localization and Speciation in Rice Grain Under Variable Soil Zinc Deficiency
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View abstract on PubMed
Summary
This summary is machine-generated.Zinc speciation in rice grain is poorly understood. This study reveals that zinc phytate, a largely unavailable form, dominates in rice, especially in zinc-deficient soils, potentially impacting human nutrition.
Area Of Science
- Agricultural Science
- Nutritional Science
- Analytical Chemistry
Background
- Rice is a staple food for over half the world's population, providing 20% of daily caloric intake.
- Zinc (Zn) is an essential nutrient for both rice growth and human health.
- Current understanding of Zn chemical forms (speciation) in rice grain and the impact of soil Zn deficiency is limited.
Purpose Of The Study
- To analyze the composition and Zn speciation in Cambodian rice grain.
- To develop a method for quantifying Zn species in rice grain.
- To investigate the effects of soil Zn availability on Zn speciation in rice grain.
Main Methods
- Utilized synchrotron-based microprobe X-ray fluorescence (μ-XRF) and extended X-ray absorption fine-structure spectroscopy (EXAFS).
- Developed a quantitative method for Zn species based on Zn-ligand coordination (oxygen and sulfur).
- Analyzed rice grain samples from varying soil Zn conditions.
Main Results
- Rice grain Zn concentrations ranged from 15-30 mg kg<sup>-1</sup>, independent of soil Zn availability.
- 72%-90% of grain Zn was found as Zn-phytate, a poorly bioavailable form.
- Minor amounts of Zn were complexed with nicotianamine, or present as ZnCO<sub>3</sub> or thiols.
Conclusions
- Soil Zn deficiency significantly impacts Zn speciation in rice grain, increasing the proportion of Zn-phytate.
- Elevated Zn-phytate levels in Zn-deficient conditions reduce the bioavailability of Zn to human consumers.
- Further research is needed to understand the implications of Zn-phytate for human nutrition in Zn-deficient regions.
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