Precise Fluor ometric Micro determination of Selenium in Agricultural Materials

Hoffman, I.; Westerby, Robert J.; Hidiroglou, M.

doi:10.1093/jaoac/51.5.1039

Cited by 45 publications

(14 citation statements)

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“…Selenium concentrations were determined by a fluorometric method using 2,3-diaminonaphtalene (Hoffman et al, 1968). Samples were digested with nitric acid and perchloric acid.…”

Section: Methodsmentioning

confidence: 99%

Selenium Addition to Colostrum Increases Immunoglobulin G Absorption by Newborn Calves

Kamada

Nonaka

Ueda

et al. 2007

Journal of Dairy Science

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The objective of this study was to show a new function of Se in IgG absorption from colostrum by newborn calves. The same amount and quality of colostrum with or without Se addition was fed to paired calves (n = 60) 4 times at <2, 12, 24, and 36 h after birth, respectively. Four-time feeding of colostrum containing 1.0 ppm Se significantly increased IgG amount in the blood plasma of calves 24 h after birth; however, its effect was small (about 20% increase). Although the addition of 3.0 ppm Se once at the first colostrum feeding was more effective on IgG absorption, its significant effect was a 42% increase on average. The increased IgG concentration of blood plasma continued for about 2 wk. It is known that the absorption of colostrum IgG is mediated by intestinal pinocytosis, which continues for only 24 h after birth. The addition of Se to colostrum might directly activate this physiological pinocytosis of intestinal epithelial cells because of the rapidity of the reaction. This effect is not nutritional but rather pharmacological. Supplemented Se also resulted in its increased concentration in blood plasma. Selenium is an essential mineral for animals; however, newborn calves are always deficient in Se at birth. Application of this method in calves would also provide an immediate supply of Se and might contribute to the development of the immune system of calves. This study showed that Se supplementation to colostrum increased IgG amount and Se concentration in blood plasma in newborn calves.

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“…Selenium concentrations were determined by a fluorometric method using 2,3-diaminonaphtalene (Hoffman et al, 1968). Samples were digested with nitric acid and perchloric acid.…”

Section: Methodsmentioning

confidence: 99%

Selenium Addition to Colostrum Increases Immunoglobulin G Absorption by Newborn Calves

Kamada

Nonaka

Ueda

et al. 2007

Journal of Dairy Science

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“…Selenium assay was conducted using the fluorometric procedure of Hoffman et al (1968). Diet ~-tocopherol was determined using the procedure of Sharp et al (1972b), and serum ~-tocopherol by the procedure of Fabianek et al (1968) as modified by Young et al (1976).…”

Section: Methodsmentioning

confidence: 99%

Selenium and Vitamin E Supplementation of High Moisture Corn Diets for Swine Reproduction

Young

Miller

Edmeades

et al. 1977

Journal of Animal Science

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Ninety pigs approximately 5 weeks of age were used in an investigation of the influence of three levels of supplemental selenium (0, .60 and 1.20 ppm), and three levels of supplemental vitamin E (0, 60, 120 ppm) in a factorial arrangement, on reproduction. The pigs were confined to 18 pens with three gilts and two boars per pen. "/'he basal diet was formulated using high moisture ensiled corn, which was later changed to high moisture propionic acid treated corn, and soybean meal supplemented with minerals and vitamins excluding selenium and vitamin E. The basal dict contained .03

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“…Indicators of iron status were whole blood haematocrit and serum ferritin. Plasma selenium levels were determined by a fluorometric method (Hoffman, Westerby & Hidiroglou, 1968) and the whole blood haematocrit by the microhaematocrit centrifugation. Serum ferritin levels were measured by a radioimmuno-assay using an Amersham kit (IM 1051, Amersham International plc, UK).…”

Section: Methodsmentioning

confidence: 99%

Selenium‐iron interaction in young women with low selenium status

Viita

Mutanen

Mykkänen

1989

J Human Nutrition Diet

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The effect of inorganic selenium (Se) supplementation on iron status and iron supplementation on selenium status was investigated in Finnish female students (=33). The students were divided into three groups and supplemented daily for four weeks either with 150 μg Se as sodium selenate, or 120 mg Fe as ferrous sulfate, or 120 mg Fe as ferrous sulfate and 150 μg Se as sodium selenate. Plasma selenium level was used as an indicator of body selenium status. Haematocrit and serum ferritin concentrations were measured to determine the changes in body iron status. The initial plasma selenium level of all subjects was 74.7 ± 2.9 ng/ml (mean ± SEM). The increase in the plasma Se level in the group receiving sodium selenate was significantly higher (P<0.05) than in the group having both sodium selenate and ferrous sulphate. The plasma selenium level in the group receiving ferrous sulphate decreased from 76.0 ± 2.8 ng/ml to 67.8 ± 2.3 (P<0.05) during the supplementation period, but returned to the initial level four weeks after the end of iron supplementation. The data indicate that the supplementary iron affected adversely the body selenium status of these subjects. On the other hand, Se supplementation had no effect on body iron status as indicated by the serum ferritin and haematocrit levels. It was also shown that there was no obvious interaction between the normal levels of selenium and iron in the body, since no correlations were found between plasma selenium and serum ferritin (r = 0.30, P>0.05) in the beginning of the study.

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Precise Fluor ometric Micro determination of Selenium in Agricultural Materials

Cited by 45 publications

References 0 publications

Selenium Addition to Colostrum Increases Immunoglobulin G Absorption by Newborn Calves

Selenium Addition to Colostrum Increases Immunoglobulin G Absorption by Newborn Calves

Selenium and Vitamin E Supplementation of High Moisture Corn Diets for Swine Reproduction

Selenium‐iron interaction in young women with low selenium status

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