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1.
Sci Total Environ ; 105: 101-7, 1991 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-1925516

RESUMEN

Fluorimetric determination of selenium in colostrum, transitional and mature human milk gave the following concentrations (mean and standard deviation): 41 +/- 16, 23 +/- 6 and 17 +/- 3 ng Se ml-1, respectively. The ranges for each kind of milk, especially for mature milk, were narrow. For all cases studied, the Se concentration in milk decreased with lactation time, reaching a plateau, at 17 ng Se ml-1, after 20 days. It is estimated that breast-fed-only babies in Greece receive approximately 5-11 micrograms Se day-1 up to 6 months of age. From consumed food data it was estimated that adult Greeks receive 100 +/- 6 micrograms Se day-1, in close agreement with our previously determined value of 110 micrograms Se day-1 estimated from food disappearance data.


Asunto(s)
Dieta , Leche Humana/química , Selenio/análisis , Adulto , Lactancia Materna , Niño , Calostro/química , Femenino , Análisis de los Alimentos , Grecia , Humanos , Lactante , Recién Nacido , Lactancia , Masculino , Embarazo
2.
Sci Total Environ ; 92: 207-22, 1990 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-2326622

RESUMEN

The Se status of 177 Greek cancer patients has been assessed by fluorimetric analysis of the Se concentration in whole blood, urine (morning) and hair. Patients either with newly diagnosed cancers or with metastases or who are undergoing therapy have statistically significant less blood, urine and hair Se than age- and sex-matched healthy controls. There is a strong and significant correlation between blood and urine or hair Se in the newly diagnosed cancers. In cancers of systems involving absorption, metabolism and excretion of Se, and in female breast cancer, the Se levels in blood, urine and hair are significantly lower than in the controls. In cancers of the respiratory and haematologic systems, blood and urine Se are normal, while hair Se is significantly lower than in controls. The results are compared with literature data; conflicting data may be due to different dietary habits of the various populations. Some cancerous tissues, such as those of the peptic system, accumulate Se compared with their adjacent, apparently healthy tissues, but others, of the urinary system for example, do not. The reason(s) for this behaviour, however, is not known.


Asunto(s)
Neoplasias/metabolismo , Selenio/deficiencia , Adolescente , Adulto , Anciano , Niño , Preescolar , Femenino , Grecia , Cabello/análisis , Humanos , Masculino , Persona de Mediana Edad , Estado Nutricional , Especificidad de Órganos , Selenio/sangre , Selenio/orina
3.
Sci Total Environ ; 91: 161-76, 1990 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-2320996

RESUMEN

The nutritional selenium status of apparently healthy Greeks has been assessed by measuring fluorimetrically the selenium content of whole blood, morning urine, hair and finger nails. The means and standard deviations were 165 +/- 33, 25 +/- 7 ng Se ml-1, 416 +/- 86, and 536 +/- 91 ng Se g-1, respectively. No significant difference was found between the selenium content of whole blood, hair and finger nails, but, for morning urine, there was a significant difference between males and females. The young and the elderly have less selenium in these biological materials than other Greeks. Whole blood selenium correlates significantly with morning urine, hair, and finger nail selenium, as does hair and nail selenium of male, female and male + female Greeks. The results are compared with those in the literature and possible explanations for the observations are presented. It is concluded that the selenium status of Greeks is satisfactory.


Asunto(s)
Estado Nutricional , Selenio/análisis , Adolescente , Adulto , Anciano , Envejecimiento/metabolismo , Niño , Preescolar , Femenino , Grecia , Cabello/análisis , Humanos , Lactante , Recién Nacido , Masculino , Persona de Mediana Edad , Uñas/análisis , Selenio/sangre , Selenio/orina , Factores Sexuales
4.
Sci Total Environ ; 84: 237-47, 1989 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-2772619

RESUMEN

The selenium content of hard and soft wheat, barley, oats, rye and corn grown in approximately 100 different locations of Greece has been determined fluorimetrically. The mean values +/- SD for these cereal types were 0.29 +/- 0.19, 0.21 +/- 0.12, 0.16 +/- 0.10, 0.14 +/- 0.10, 0.19 +/- 0.10 and 0.12 +/- 0.08 ppm Se (dry weight basis), respectively. Based on data for selenium in corn from 96 different locations, a geobotanic map of Greece for the selenium in soil available for uptake by plants was prepared. Macedonia, West Epirus, south-east Thessaly, north-east Sterea Hellas and the Aegean Islands produce corn deficient or low in selenium, but only sporadic selenium-deficiency diseases in animals have been observed in many of these areas, probably because the farm animals are given mixed food or they are free to graze. No areas with toxic levels of selenium in soil were found.


Asunto(s)
Grano Comestible/análisis , Selenio/análisis , Geografía , Grecia , Hordeum/análisis , Secale/análisis , Suelo/análisis , Zea mays/análisis
5.
Sci Total Environ ; 76(1): 49-54, 1988 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-3238414

RESUMEN

The total selenium concentration in various waters from all over Greece was determined fluorimetrically. The concentration in most of the drinking water, either from the tap or bottled, was within the range 100-200 ng l-1 and showed no great seasonal fluctuations. Most Greeks receive 0.2-0.4 micrograms selenium per day from drinking water. Coastal surface water contains 100-250 ng Se l-1, while higher concentrations are found at locations regarded as polluted.


Asunto(s)
Agua de Mar/análisis , Selenio/análisis , Abastecimiento de Agua/análisis , Geografía , Grecia
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