8. Symposium - Vitamins and Additives
(English)
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8th Symposium
"Vitamins and Additives Vitamins
and Additives in the Nutrition of Man and Animal"
September 26 to 27, 2001
Abstracts
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Organizer: Institute of Nutritional Sciences of the Faculty for Biology and Pharmaceutics of the Friedrich Schiller University Jena and Institute of Animal Nutrition of the Federal Agricultural Research Centre (FAL) Braunschweig
Short Report
The
8th Symposium „Vitamins and Additives in the Nutrition of Man and
Animal” was organized by the Institute of Nutrition of the Friedrich Schiller
University Jena, Germany, together with the Institute of Animal Nutrition of the
Federal Agricultural Research Centre Braunschweig, Germany. 190 delegates from
13 countries discussed current results on activity of vitamins, special
ingredients of fruits and vegetables, probiotics and substances for supplements
in 6 plenary lectures, 36 short presentations and 57 poster presentations. Some
aspects relevant for human nutrition are reviewed below.
The
new reference values for vitamin intake, published from the Nutrition Societies
in Germany, Austria and Switzerland in 2000, contain – in addition to the
nutrition data – aspects of prevention. The recommendations for the intake of
folic and ascorbic acid were increased by 30% based on new data on homocysteine
and new biokinetic results. Probiotics within the human diet have to serve some
criteria like a beneficial effect, no pathogenicity, survival within the
gastrointestinal tract and vitality during storage of food. Supplementation of
foods was discussed with special regard to food security. While many foods are
supplemented with vitamins and additives in Germany discussions to solve
security problems within the development of food increase. Formation of
resistance to antibiotics was presented as a current problem.
Pregnant
women excreted only low amounts of retinal and retinal binding protein with
their urine. Thus, a supplementation during pregnancy is not recommended. High
doses of vitamin E (1 and 100 mg/kg body weight) with their antioxidant
potential reduced stroke volumes by 66% or 81%. In contrast, extremely high
dosages of vitamin E (100-10000 mg/kg feed) together with high amounts of
polyunsaturated fatty acids destabilized the erythrocytes membrane of rats.
Enrichment
of juices with vitamins as well as concentrations of antioxidants in beverages
and their bioavailability were discussed in many presentations. Anthocyanins
with their antioxidant capacity are one major group of flavonoids. A black
carrot extract with its cyanidine content inhibited proliferation of human colon
tumour cells. But it also showed cytotoxic effects, which were not observed with
pure cyanidine. Over 30 phenolic compounds with antioxidant activity were
quantified in red wine. The total phenolic content was well correlated with
the antioxidant activity. Using tannins within the processing of wine led to the
lowest loss of phenols. Different green and black tea extracts had comparable
total phenolic contents and antioxidant activity while the content of
catechins was highest in green teas.
Consumption
of one litre of green or black tea per day resulted in significantly lowered
ferritin values only for women with low basal values of this iron status
parameter. New developments regarding the HPLC analysis of secondary plant
products like carotenoids and polyphenols were presented. The importance of
the antioxidant capacity as diagnostic tool for newborns was discussed, looking
for example on pro-oxidant ferrous ions out of the fetal hemoglobin.
Physiological
activity of conjugated linoleic acids (CLA) and their importance within the
metabolism of fatty acids and eicosanoids was presented for the CLA isomers cis-9, trans-11 and trans-10,
cis-12. Supplementation of sportsmen with 18 g creatinine monohydrat
per day for one week resulted in 34.9% more strength within power training. The
minimally needed individual dose has to be defined to prevent yet unknown risks.
Phytoestrogens within a soy-rich diet, as for example genistein, reduced the
risks for hormone dependend cancers, cardiovascular diseases and osteoporosis.
The symposium book (ISBN 3-933 140-51-X) can be ordered for 25,00 € at the address below.
Further information please get via FAX:
+49 3641 949612, via e-mail: b5rasc@uni-jena.de or by letter: Friedrich Schiller University Jena,
Institute
of Nutrition, Dornburger Str. 24, D-07743 Jena (Germany).
webmaster: PD Dr. R. Schubert
see also 6.
Symposium 1997, 7th Symposium 1999,
9th
Symposium 2003,
homepage Institute of Nutritional Sciences: http://www.uni-jena.de/biologie/ieu/ew/