zaterdag, september 26, 2015

Dahlia dahlia dahlia

Dahlia's zijn niet direct mijn lievelingsplanten maar de kleine pompombloemen die nu verwilderd langs de boerderijruine naast ons Bretoense huis bloeien, kunnen mij wel bekoren. Hoe zij elk jaar weer stralend opboksen tegen grassen, teunisbloemen en wilde asters spreekt mij wel aan. Als ik dan ontdek dat de knollen ook nog eetbaar zijn en de bloemen kleurstoffen bevatten, begin ik ook deze protserige bloemen te bewonderen.

Dahliaknollen bevatten net zoals paardenbloem, cichorei en aardpeer veel inuline. Mrs Grieve 1931 beschreef het proces om er inuline uit te winnen. Iets om eens te proberen?
The Inulin obtained in Dandelion and Chicory is also present in Dahlia tubers under the name of Dahlin. After undergoing a special treatment, Dahlia tubers and Chicory will yield the pure Laevulose that is sometimes called Atlanta Starch or Diabetic Sugar, which is frequently prescribed for diabetic and consumptive patients, and has been given to children in cases of wasting illness.
There was a very considerable business done in this product before the War by certain German firms. In a paper read at the Second International Congress of the Sugar Industry, held at Paris in 1908, it was stated that pure Laevulose is preferably made by the inversion of Inulin with dilute acids, and that the older process of preparation from invert sugar or molasses does not yield a pure product. The first step in the technical production of Laevulose is in the preparation of Inulin, and Dahlia tubers or Chicory root, which contain 6 to 12 per cent of Inulin are the most suitable material. Chicory root can readily be obtained in quantity, and Dahlia plants, if cultivated for the purpose, should yield in a few years a plentiful supply of cheap raw material.

For extraction of the Inulin, the roots or tubers are sliced, treated with milk of lime and steamed. The juice is then expressed and clarified by subsidence and filtration, the clear liquid being run into a revolving cooler until flakes are produced. These flakes are separated by a centrifugal machine, washed and decolorized, and the thus purified product finally treated with diluted acid, and so converted into Laevulose. This solution of Laevulose is neutralized and evaporated to a syrup in a vacuum pan.

Laevulose can be produced in this manner from Chicory roots and Dahlia tubers at an enormous reduction of price from the older methods of preparing it from molasses or sugar, the resultant product being moreover of absolute purity. Its sweet and pleasant taste are likely to make it used not only for diabetic patients, but also in making confectionery and for retarding crystallization of sugar products. It can also readily be utilized in the brewing and mineral water industries.

The research staff of one of the Scottish Universities during the War developed a process of extracting a valuable and much needed drug for the Army from Dahlia tubers, and was using as much material for the purpose as could be spared by growers.

En brood of koekjes bakken: Dahlia Bread (Dahlia pinnata)
The tubers should be just dug so there’s not a thick skin on them. Washed well. Peeling is optional.

Preheat oven to 200°
3 eggs
1 cup oil
2 cups sugar
2 cups grated Dahlia tuber
2 tsp vanilla
3 cups flour
1 tsp salt
1/4 tsp. baking powder
1 tsp. soda
2+ tsp cinnamon

Beat eggs until light and foamy. Add oil, sugar, grated dahlia tuber and vanilla. Mix lightly but well. Sift dry ingredents together. Add to wet ingred. Mix only until blended. Put into greased loaf pans. Bake in 200° oven for 1 hour.

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