Influence of the rat diet enrichment with oat β-gucans on the assimilation of B group vitamins, mineral elements and lipid metabolism

• Vera M. Kodentsova
• Оlga V. Kosheleva
• Oksana A. Vrzhesinskaya
• Galina V. Guseva
• Vladimir A. Zotov
• Svetlana N. Leonenko
• Nataliya V. Zhilinskaya

Abstract

Despite the widespread use of oat β-glucans as ingredient of foods and dietary supplements, there is insufficient data on their effect on the metabolism of vitamins and minerals.

The purpose of the study was to evaluate the effect of including oat bran with a high content of β-glucans (β-glucan) in the diet on the absorption of micronutrients and lipid metabolism in growing rats deficient in vitamins D, group B and trace elements (iron, copper, zinc).

Material and methods. After the development of micronutrient deficiency (for 23 days), in order to assess the effect of oat bran (5%) with a high content of β-glucans on the correction of the micronutrient status of growing male Wistar rats (with initial body weight of 70.7±0.7 g), the missing micronutrients were introduced in the semi-synthetic diet deficient in vitamins D, group B, iron, copper and zinc within 7 days either along with β-glucan (1.47%) or without its addition. Indicators of micronutrient sufficiency (riboflavin serum concentration, daily urinary excretion of thiamine, riboflavin and 4-pyridoxic acid, measured by fluorometric methods; serum concentration and urinary excretion of calcium, magnesium, iron, zinc, copper, phosphorus, measured by the atomic absorption method or using standard methods on a biochemical analyzer) and the biochemical parameters of blood serum were compared with the parameters of rats adequately provided with all micronutrients throughout the experiment.

Results. Replenishment of missing micronutrients in the diet of rats with deficiency in vitamins D and group B, iron, copper and zinc for 7 days led to the elimination of deficiency of vitamins B₁, B₂ and B₆, regardless of the presence of β-glucans in the diet. At the same time, against the background of the presence of β-glucans in the feed, an increase in the absorption of iron was observed, as evidenced by an increase by 1.73 times in iron blood plasma level (р<0.05) and a tendency towards its urinary excretion decrease by 1.60 fold (р<0.10) compared to animals from the control group. Adding oat bran with β-glucans to the feed did not lead to a decrease in blood plasma level of total cholesterol and low-density lipoproteins cholesterol. The levels of high-density lipoprotein cholesterol and triglycerides in rats of all three groups did not have statistically significant differences.

Conclusion. The presence of β-glucans in the diet had virtually no effect on the absorption of B vitamins and improved the absorption of iron.

Keywords:combined micronutrient deficiency; B vitamins; oat β-glucan; correction, iron; rats

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