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Biomedical subjects

B Blanc

Publications and source records attributed to B Blanc.

At least 163 records · Page 9Linked to original sources
PubMed1981

The fat globule size distribution in human milk.

The size distribution of fat globules in human colostrum and milk was measured using a conductometric method. The number-, surface- and volume-frequency functions were analyzed and various parameters related to the stability of the polydisperse fat emulsion were calculated. The shape of the distribution curves suggests the presence of sub-populations of differently sized particles. A postulated sub-population of small globules with a size frequency maximum below 1 micrometer comprises 70-90% of the number of globules but only a few percent of the fat volume. A sub-population of medium-sized globules with a size frequency maximum around 4 micrometer comprises the largest amount of the fat. A shoulder in the distribution curves around 8-12 micrometer indicates a third population of large globules. They contribute about 0.01% to the number of fat globules but represent 1-4% of the milk fat. The height but not the position of the maximum of the sub-distributions changed throughout lactation. This affected the size-related parameters such as the overall mean globule diameter. The volume/surface average diameter increased from about 1.8 micrometer in colostrum to 4.0 micrometer after 4-5 months of lactation. The range of globule size is similar in human and cow's milk and milk of some other species. Compared to cow's milk human milk contains more small fat globules, especially at the earlier stages of lactation.

Animals↗
PubMed1979

Isolation and partial characterization of ovine lactoferrin.

Ovine lactoferrin was isolated by ammonium sulfate precipitation and ion exchange chromatography. Comparative analyses were performed with the bovine protein. Differences in the amino acid compositions and the tertiary structure of the proteins were observed.

Amino Acids↗
PubMed1979

Hydration of casein micelles: kinetics and isotherms of water sorption of micellar casein isolated from fresh and heat-treated milk.

Water vapour sorption isotherms of casein micelles prepared from raw milk and various heat-treated milks were determined. The equilibrium water contents of the heated preparations were markedly lower than that of the raw-milk casein over the whole range of vapour pressures studied. An analysis of the sorption isotherms in the relative vapour pressure range 0.1--0.45, according to the Brunauer, Emmett & Teller (1938) equation, showed that there were significant differences between preparations in the computed monolayer contents. Differences in the rates of water sorption were also observed between the different preparations. As judged from the amount of absorbed water, the influence of the heating methods could be ranked in the order: HTST (92 degrees C) approximately UHT (direct) less than UHT (indirect) less than HTST (72 degrees C).

Animals↗
PubMed1978

[Post-partum contraception (author's transl)].

The authors have come to the conclusion that the ideal time to start female contraception is when the periods return following delivery. They arrived at this conclusion after studying the disadvantages of the various methods of hormone contraception and of mechanical female contraception immediately following delivery. Directly after delivery contraception should be in the hands of the man and not the woman. If better information is given to the couple during pregnancy and in the postnatal period it should direct them towards such formations of contraception. The problem, however, of grand multipara who are feckless, ignorant and of low social class, still remains. Medroxyprogesterone, if it is used at all immediately after delivery, should be given in a dose of 150 mg. As far as tubal ligation by mini-laparotomy after delivery goes this is permanent contraception and its indications should be considered with very great care.

Contraception↗
PubMed1976

Iron-dependent binding of 8-anilinonaphthalene-1-sulphonate by both lactoferrin and transferrin.

Fluorescence of 8-anilinonaphthalene-1-sulphonate is enhanced by both lactoferrin and transferrin. The enhancement is relatively low between pH 4 and 8, and high at below pH 4. At physiological pH the fluorescence enhancement is higher with the iron-deprived than with the iron-saturated proteins. Binding of iron by lactoferrin is associated with lowering affinity for the dye.

Anilino Naphthalenesulfonates↗
PubMed1975

Hydration and thermal denaturation of beta-lactoglobulin. A calorimetric study.

The thermal properties of the beta-lactoglobulin-water system were investigated by differential scanning calorimetry in the temperature range from -50 to 130 degrees C. Determination of the heat and temperature of fusion of the absorbed water allowed resolution of the water into four different states. The amounts of water in these states were different for samples before and after heat denaturation. In the case of denatured beta-lactoglobulin, a smaller amount of water with thermal properties different from ordinary water was observed and its total water binding capacity was lower. The thermal stability of beta-lactoglobulin in the water content range from 0 to 0.75 g/g showed a strong dependence on the degree of hydration. A correlation was observed between the changes in the thermal stability of the protein and the changes in the state of the absorbed water. The results are compared with those obtained from similar measurements of other globular proteins and of fibrillar proteins.

Animals↗