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Biological Trace Element Research

, Volume 148, Issue 1, pp 83–90 | Cite as

The Effects of Glutamate and Citrate on Absorption and Distribution of Aluminum in Rats

  • Xin Wu
  • Jing Li
  • Jiang-Ning Hu
  • Ze-Yuan Deng
Article

Abstract

The objective of this study was to evaluate the effect of glutamate (Glu) and citrate (Cit) on the absorption and distribution of aluminum in rats. In the in vitro experiment, 18 adult male Sprague–Dawley rats (average weight of 250 ± 15 g) were randomly divided into three groups. The entire intestine was rapidly removed and cultured in prediction samples of 20 mmol AlCl3, 20 mmol AlCl3+20 mmol Cit, and 20 mmol AlCl3+20 mmol Glu, respectively. Liquid in different intestines and the intestines were obtained for Al determination. In the in vivo chronic study, 24 adult male Sprague–Dawley rats (average weight of 127 ± 10 g) were divided into four groups fed with the following diets: no Al and Glu added (control), AlCl3 (1.2 mmol), AlCl3 (1.2 mmol) + Cit (1.2 mmol), and AlCl3 (1.2 mmol) + Glu (1.2 mmol) daily for 50 days, respectively. After rat sacrifice, blood samples were obtained for biochemical analyses, and organ samples like the brain, kidney, liver, and bone were rapidly taken for Al determination. The results showed that the absorption rate of Al with the following order: duodenum > jejunum > ileum in the in vitro study and the administration of AlCl3+Cit or AlCl3+Glu resulted in significant increases in Al absorption in the three parts of the gut (duodenum, jejunum, and ileum) compared to the AlCl3 alone group based on wet weight (P < 0.05). There were no differences between the AlCl3+Cit and AlCl3+Glu groups. In the in vivo chronic study, supplementing either AlCl3 alone or AlCl3+Glu decreased food consumption significantly (P < 0.05) compared with the control group. Compared with the control group, animals fed with the AlCl3 diet monitored for red blood cell, kidney, and liver showed a higher level (P < 0.05), but did not significantly increase Al retention in the brain and bone (P > 0.05); animals fed with AlCl3+Cit diets were monitored for higher Al retention in the brain, kidney, bone, and liver (P < 0.05), while animals fed with AlCl3+Glu diets were monitored for red blood cell, brain, and kidney (P < 0.05). Compared with the AlCl3 group, simultaneous administration of AlCl3 and Glu led to a significant increase in Al retention in red blood cell, brain, and kidney (P < 0.01) while AlCl3 and Cit in the kidney and bone (P < 0.01). Simultaneous administration of AlCl3 and Cit significantly increases plasma malondialdehyde level (P < 0.05); both simultaneous administration of AlCl3 and Glu or AlCl3 and Cit led to significant decreases in superoxide dismutase level in the plasma (P < 0.05), while AlCl3 alone did not. The results indicated that both Cit and Glu enhanced Al absorption in the intestine in vitro, and Glu increased Al deposition in red blood cell, brain, and kidney in vivo.

Keywords

Glutamate Citrate Aluminum Al–l-glutamate complex Brain 

Notes

Acknowledgments

This research was jointly supported by grants from the Open Project Program of State Key Laboratory of Food Science and Technology, Nanchang University (no. SKLF-KF-201005), the National Natural Science Foundation of China (nos. 31101730 and 31110103909), the Hunan Provincial Natural Science Foundation of China (11JJ4018), and the China Postdoctoral Science Foundation-funded Project (20110491493).

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  1. 1.State Key Laboratory of Food Science and Technology, Institute for Advanced StudyNanchang UniversityNanchangChina
  2. 2.Key Laboratory for Agro-ecological Processes in Subtropical Region, Institute of Subtropical AgricultureChinese Academy of SciencesChangshaChina

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