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  • Author or Editor: M. Masson x
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This study assessed the rheological behaviour, physical stability, and the phenolic compounds of Eugenia pyriformis Cambess. (uvaia) and Eugenia uniflora L. (pitanga) fruits. The effect of temperature on the rheological behaviour of the fruit was evaluated (10–60 °C) by means of non-oscillatory rheological analysis in a rheometer. The whole samples (purée) exhibited shear-thinning behaviour (n<1), whereas the centrifuged samples exhibited Newtonian behaviour (n=1). The Arrhenius equation accurately described the effect of temperature on the apparent viscosity of the fruit. The stability study was performed by means of sedimentation and turbidity testing. The stabilisation of purées occurred on the second (Eugenia pyriformis Cambess.) and on the third (Eugenia uniflora L.) day of storage. The results demonstrated that turbidity increased with an increase in homogenization velocity. The phenolic compounds of the fruit were identified and quantified by reverse-phase high-performance liquid chromatography (RP-HPLC). The samples presented significant differences in the concentration of phenolic compounds. Among the phenolic acids identified, gallic acid was the one with higher concentration in both fruit assayed. Comparing the fruits, it was observed that Eugenia pyriformis presented higher content of flavonoids (5-fold) and Eugenia uniflora presented higher content of phenolic acids (8.5-fold), especially gallic acid. Myricetin and quercetin were the main flavonoids determined in Eugenia pyriformis.

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Abstract  

The trends of127I,40K, and99Tc levels were measured for several years inFucus serratus collected in 3 different Channel coastal stations. The results demonstrated cyclic seasonal variations of the levels, with maximum values in winter and minimum values in summer (ranging between 2 and 3). Ash levels evolved with a similar cycle, which allowed to estimate that the cycle thus observed was related to the alga biological activity and not to the releases. Trends of99Tc levels were more complex. At Roscoff, a station little exposed to the releases, levels varied with the same annual cycle as natural elements. At Herquemoulin, a station close to the release point, the trend was mainly related to the released activities with a delay of about 1 year. At Wimereux, a distant station more strongly affected by sea currents, the cycle appeared in 1983 and 1984 but was hidden in 1985 and 1986 by the arrival of waters more strongly labelled because of the larger releases that occurred in 1985 (26 TBq), instead of 12 TBq in 1983 and 1984.

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Abstract  

Determination of99Tc in two biological indicators,Fucus sp. andPatella sp., of the French coast of the Channel showed that this radionuclide found in small amounts, was dispersed eastwards from the La Hague reprocessing fuel plant. However,99Tc trace amounts were also detected in the river Seine bay and in the bay of Mont St. Michel, which confirms the great mobility of this element.

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