European Food Research and Technology

Ein Triadentest mit Sauerteig-und in direkter Führung hergestellten Roggenmischbroten bei 721 Probanden im Alter von 18–65 Jahren ergab, daß die Konsumenten von Roggenmischbrot geschmacklich zwischen beiden unterschiedlich hergestellten Broten nicht unterscheiden können.

Goat dairy products are considered as a suitable alternative to cow milk products for some special categories of consumers (infants, old, and convalescent people). In the present research, a study on the lipid fraction of commercial goat milk and cheese samples purchased from Umbrian market was carried out. Particular attention has been paid to evaluating conjugated linoleic acid (CLA) content and determining some interesting nutritional indexes. The results of goat milk samples showed that saturated, monounsaturated and polyunsaturated fatty acid contents were on average 71.2, 23.4, and 3.8 %, respectively. CLA content (cis-9, trans-11 isomer) was on average 11.5 mg/100 g in milk. Considerable variability was observed for n6/n3 ratio that varied from 2.7 to 10.6 in the considered goat milk samples. With regard to goat cheese samples CLA concentration was on average 118.8 mg/100 g in fresh cheese and 217.7 mg/100 g in semi-hard cheese, and the difference was not significant. Interestingly, α-linolenic acid content was higher and n6/n3 ratio was lower in semi-hard with respect to fresh cheese samples (p < 0.05).

Sowohl aus einer Literaturstudie als auch aus eigenen Untersuchungen ergab sich, daß der Selengehalt von Milch beträchtlichen Schwankungen unterliegt. Der Selengehalt von deutscher Milch (60 gefriergetrocknete Proben) lag zwischen 0,05 und 0,13 mg/kg, der von Magermilchpulver aus dem gesamten Bundesgebiet (27 Proben) zwischen 0,088 mg und 0,152 mg/kg. Bei der Trocknung von Magermilch durch Sprühoder Walzentrocknung wurden Selenverluste unter 5 % (4,3 bzw. 4,7 %) festgestellt. Das Selen ist fast ausschließlich an die Milchproteine gebunden, allein 74 % wurden im Casein wiedergefunden, 19 % an Globulin und Albumin.

Potassium permanganate and hydrogen peroxide were found to be useful chromo-specific spray reagents for detecting precarthamin on air-dried chromatograms. Upon spraying them at relatively low levels, a royal red colour developed almost instantly without perceptible effect from traces of organic solvents on the chromatograms. The data proved that potassium permanganate is superior to hydrogen peroxide in its efficacy.