RESUMEN
By optimizing the conditions for determining trans-phylloquinone and its metabolite, K-2,3-epoxide, in serum through a two-step HPLC process combined with fluorometric detection after coulometric reduction, we have been able to develop a method applicable to small volumes of serum (200 to 500 microL). The limit of detection (signal-to-noise ratio of 3) was 15 ng/L for trans-phylloquinone, 30 ng/L for K-2,3-epoxide. The trans-phylloquinone concentrations measured by this method in serum from 82 children, ages one to six years, whose results were normal for overall coagulation tests, ranged from 40 to 880 ng/L (median 175 ng/L). We discuss these findings and compare them with vitamin K1(20) values reported for adults.
Asunto(s)
Vitamina K 1/análogos & derivados , Vitamina K 1/sangre , Niño , Preescolar , Cromatografía Líquida de Alta Presión/métodos , Colorimetría , Femenino , Humanos , Indicadores y Reactivos , Lactante , Masculino , Espectrometría de Fluorescencia , Estadística como AsuntoRESUMEN
The lymphoblastic stimulation test (LST) with cow's milk proteins was performed in 114 infants. In 42 infants, digestive intolerance to cow's milk proteins (CMI) was suspected; withdrawal-rechallenge test confirmed intolerance in 34, and disproved it in the other eight patients. Of the other patients, 17 had acute gastroenteritis, 11 had postgastroenteritis subacute diarrhea, 12 had gluten intolerance, 14 had intractable diarrhea, and 18 had no digestive disorders. Of the 34 infants with CMI, 27 (79%) had a positive LST to one or more cow's milk proteins. Of the 34 positive LST patients, 12 also had soya intolerance; nine of these 12 infants (75%) had positive LST to soya. Of the eight infants who had a negative cow's milk rechallenge test, five (62%) had a positive LST. In the other groups, results were also positive in 12-27% of those having diarrhea of infectious origin or gluten intolerance, and in none of the infants without digestive disorders. Of the 14 cases of severe intractable diarrhea, 12 (86%) were also LST-positive, but CMI could not be excluded. LST was positive, particularly in diarrheas of neonatal origin. Lymphoblastic stimulation was induced more frequently by casein than by beta lactoglobulin, and least frequently by alpha lactalbumin. In conclusion, LST is frequently positive in CMI, but is not sufficiently specific to be a reliable diagnostic examination.
Asunto(s)
Diarrea Infantil/diagnóstico , Hipersensibilidad a los Alimentos/diagnóstico , Activación de Linfocitos , Proteínas de la Leche/efectos adversos , Leche/efectos adversos , Animales , Diarrea Infantil/etiología , Diarrea Infantil/inmunología , Femenino , Hipersensibilidad a los Alimentos/etiología , Hipersensibilidad a los Alimentos/inmunología , Humanos , Lactante , Recién Nacido , MasculinoRESUMEN
Synopsis The distribution and dissociation of 14C-benzoyl-peroxide were studied in the skin of hairless rats after the application of a 10% gel during 3, 8 and 24 h. The distribution was appraised in the stripped horny layer and in the epidermis, and the dermis cut in slices parallel to the cutaneous surface. The conversion of benzoyl peroxide (b.p.) to benzoic acid (b.a.) was investigated from extracts of these different cutaneous layers by thin layer chromatography (TLC). The greatest amount of penetrating b.p. (9 to 14% of the applied dose) was found in the horny layer, which forms a reservoir and where biotransformations were reduced. Small quantities of b.p. diffused toward the epidermis down to the deeper dermis, where b.a. represented 74% of the radioactivity. Distribution gradients of the radioactivity and conversion rates to b.a. were stable between 3 and 24 h of application in all parts of the skin. This result showed that diffusion of b.p. from the vehicle was in balance with the dissociation processes and the blood resorption as b.a., throughout the experiment.
RESUMEN
An entirely automatic method, without prior extraction, is described for the determination of total serum lipids by a nephelemetric method. The results are compared with those obtained by Canal's method. There is a good correlation between the two technics. With a similar concentration of lipid the respective quantities of cholesterol and triglyceride do not intervene in the flocculation. The respective influence of the bilirubin concentration, hemolysis, and the concentration and nature of the serum proteins is considered. This method should permit simultaneous autoanalysis of the three parameters of classical lipid investigation: total lipids, triglycerides and cholesterol.