Selenium in the food chain of Buriatia
Golubkina, Nadegda; Mnkueva, Sangidma; Alfthan, Georg (2005)
Golubkina, Nadegda
Mnkueva, Sangidma
Alfthan, Georg
Julkaisusarja
Agrifood Research ReportsMaa- ja elintarviketalous
Numero
69
Sivut
s. 87
MTT
2005
Tiivistelmä
Previous reports (Ermakov 2003) have shown that selenium concentrations in Buriatian oodstuffs are in the range of 20-280 µg/kg, revealing the possibility of local severe selenium deficiency similar to the Se deficiency in the Chita region, where the range of foodstuff selenium concentrations is much narrower and lower, 10-80 µg/kg. The selenium concentration in foods grown and consumed and in plasma and hair of people living in Buriatia were compared with that of the endemic Chita region of Russia. The mean (SD) results for the selenium concentration in cereals of Buriatia were in wheat 53±13 µg/kg (n=9, 31-78 µg/kg), barley 54 µg/kg (n=6), oats 49±24 µg/kg (n=4, 43- 86 µg/kg) and rye 22-29 µg/kg (n=2). The selenium concentration of milk was 100 µg/kg dry matter and of meat of domestic animals , pork 18-173 µg/kg, beef 49-144 µg/kg, mutton 162-225 µg/kg and horse 148-152 µg/kg fresh matter (32-218 µg/kg dry matter for Chita region). The mean selenium concentration of bread was extremely high and similar to that of the Chita region, 202±149 µg/kg dry matter (54-433 µg/kg, n=14) indicating the utilization of imported high-selenium wheat in the republic. Fish of Baikal and other lakes of Buriatia seem also to be an important source of selenium for human beings. Values as high as 347 ±179 µg/kg fresh matter (10 species, range 84-687 µg/kg) were typical for small lakes of Buriatia and different parts of Lake Baikal. The human selenium status of Buriatia residents were characterized by plasma selenium concentration 0.85±0.16 µmol/L (n=21, Uhlan-Ude) and hair selenium content, 408±78 µg/kg (n=86, 297-531 µg/kg). According to meat and human hair selenium data, selenium deficiency is typical for a relatively narrow territory located in the South-East of Buriatia that includes Selenga, Uhlan-Ude, Eravna and Mukhorshibirsk regions. Cereal selenium values were higher than values typical for the Chita region. Thus local selenium deficiency and utilization of imported wheat with high selenium content are the main characteristics of modern selenium status of Buriatia. Nevertheless the situation may be worsened in case selenium-rich wheat imports are discontinued.
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