DE2047504B2 - - Google Patents

Description

It is also known (see the journal »Staying under chemical conditions; the extract is closed "Cb.es Zentralblatt" vol. 137/1966, No. 4-3054) that a discard. Then the starting material is in

n_
10

° 48

IV

known methods, however, in the same way. can also be in several stages with decreasing

The invention is based on the object of a NaOH concentration up to complete exhaustion

industrially applicable method for isolating fung of the starting material can be carried out.

water-insoluble pentosans with significantly increased 65. During the extraction, the pH value must be between 8 and

Find effectiveness. 13, better between 11 and 12.5, can be kept.

The invention consists in that the extraction It is advisable to carry out the extraction in an inert

perform the pentosans at a temperature between 53 and atmosphere. The extract obtained

phase must be poured off and, if necessary, diluted if the viscosity is too high.

After that, undissolved starch is made from the extract phase centrifuged or by means of an adsorbent material, preferably active charcoal or rock wool filtered off in an alkaline medium. The filtration can also be carried out after electrodialysis in neutral Environment.

The extract phase is then to be subjected to ^{electrodialysis at a temperature between 20 and 100 °} C., the alkali present in the extract phase being removed. During electrodialysis, care must be taken that the pH does not drop below 6. Then it is dried, for example by spray drying.

For at least partial hydrolysis of proteins, the concentration of 1 to 5% brought extract phase to one under nitrogen for two to eight hours before electrodialysis Temperature of 80 to 85 ° C can be heated. Hydrolyzed ones still present after electrodialysis Proteins can od by precipitating the pentosans in the form of white fibers with ethanol. removed.

Claims (3)

55 ° C takes place and the extract phase at a temperature between 20 and 100 ⁰ C and a pH of at least 6 is electrodialyzed. 1 Process for Isolating Water-Insoluble According to a preferred embodiment of the invention Pentosans for the "use as an additive 5 is a multiple extraction of the pentosans with When making bread or as a gelling agent, NaOH with decreasing NaOh concentration the pentosans from grasses or gramineae. η The advantages achieved by the invention are with jg NaOH at a pH between 8 and 13, initially seen in the fact that the extraction of the, in particular between 11 and 12.5, extracted, io pentosans at an elevated temperature is practically finished from the extract phase after centrifugation or 1 to 2 days, wherein the undissolved in the output filtering starch isolated and einge- material known to be drying to the effect of pentosans, characterized gekennzeich- an adverse influence exerting starch which net that the extraction of pentosans at generally at temperatures of about 50 ⁰ C in Water at a temperature between 53 and 55 ° C is carried out 15 is at least partially soluble, surprisingly and the extract phase goes into solution at a temperature not in the extract phase. In addition, between 20 and 100 ° C and a pH of beyond, which is known to be electrodialyzed faster than a usual at least 6. Dialysis feasible electrodialysis to pentosans 2. The method according to claim 1, characterized with surprisingly increased effectiveness. So results an addition of 1% obtained according to the invention by multiple extraction of the pentosans 20 with NaOH decreasing NaOH concentration. Peniosane a bread volume increase from 15 to 25% and an addition of 2% increases the bread volume by 25 to 60%. Wheat bread with? until 3% pentosans according to the invention stay three times longer as fresh as bread without such additives. Further effect the pentosans obtained according to the invention The invention relates to a method for isolating not only a significant improvement in baking water-insoluble pentosans, the use as properties of low-quality baking flour types, additives in the production of bread, biscuits and cereals with far advanced germination od. B. 30 (eg., 10%), but also a baking quality v _On Puddingpulver find the pentosans from Grä- practically not been verbackbaren flours, like ,, · · "" xt λιτ u * ■ it manioc flour, Rice flour, etc., bringing the invention sern or gramineae with _m NaOH at a pH of _considerable importance for the fight against hunger ! between 8 and 13, especially between 11 and 12.5, in underdeveloped countries. This self-extracted, from the extract phase after centrifugation 35 shafts are made by known methods, or filtering off undissolved starch, isolated and pentosans obtained also by means of conventional dialysis to be dried. not reached. The cause of the particular effect could be pentosans obtained according to the invention in a known process of the above-mentioned vity Genus (see magazine "Getreide und Mehl" booklet not yet scientifically clarified) 4/1967, p. 46/47) the extraction of the 40 is probably due to the fact that the water-insoluble pentosans from rye or wheat pentosans as a result of the extraction at increased temp grains at a temperature of 20 ° C, the insulation temperature and due to special physicochemical by adding ethanol to the extract phase and electrodialysis conditions are different subsequently obtained a purification of the pentosans by means of structure. Ion exchanger. The method according to the invention is described below Recovered water-insoluble rye pentosans lead explained in detail: when added to bread dough in an amount of starting materials for the production of water-1 or 2% to a B ^r otvolumenvergrößerung of insoluble pentosans are grasses or Gramineae, 6 or 7% and give a better crumb structure, ie, members of the grass family, whereby the overall better coloration and better freshness of the plant or only parts of the plant, such as. B. Broteo. This known method does not yet open up any grains, stems or stalks, leaves, roots, husks, economical presentation and use of these etc. can be used.
Pentosans, because the extraction of the pentosans min- The starting material should initially take half a month and the effectiveness of the -. . -. _ari ™ Bäumen ₍ ,,, ηηκί, ΐΛ · η; „" _Mo nu Pentosane is insufficient. 55 ^day ^ room temperature (20 to 30 C) in ^ NaOH