Abstract:
A method of improving the utility of corn bran (i.e., hulls derived from milling) is provided. The corn bran is crosslinked with a polyvalent compound capable of forming a plurality of covalent bonds to one or more constituents of the corn bran. The crosslinked corn bran finds particular utility in papermaking. Paper furnishes and paper products derived therefrom are also provided.
Abstract:
A starch-containing material is gelatinized in a continuous process by contacting discrete granules of the material with steam under substantial turbulence utilizing a Venturi mixing effect. The water content of the initial turbulent mixture is sufficiently high so as to permit gelatinization at elevated temperature but insufficient to cause formation of an aqueous slurry of the starch-containing material.
Abstract:
Large diameter starch granules derived from yellow field pea, Pisum sativum (var) and faba bean, Vicia faba L. (Leguminosae) are used to replace scarce arrowroot starch granules as a protective stilt material in microencapsulated coatings, including carbonless copy paper. The "stilt" material is used to prevent premature rupture of the microcapsules and early release of the microencapsulated materials. It has been discovered that the natural granule size, and other granule properties of the yellow field pea and faba bean starches are ideally suited to replace arrowroot starch granules as a protective material. In certain coating processes in which the temperature at the coated surface exceeds the normal pasting temperature of these starch granules, the pasting temperature of the granules can be raised by a crosslinking reaction under temperature and pH conditions to preserve the granular structure of the starch particles. A polyfunctional crosslinking agent, such as epichlorohydrin, phosphorus oxychloride, acrolein, or urea-formaldehyde can be used. Under highly alkaline conditions, using phosphorus oxychloride in a stepwise reaction procedure, it is possible to increase the pasting temperature of the starch granules by more than 25.degree. F.These large diameter starch particles may also be used for other purposes, such as for anti-offset powders in lithography, either with or without crosslinking or other derivatization to further improve chemical and physical properties. These starches are also useful as absorbable dusting powders. The large granule starches derived from most varieties of peas and beans can be used in the same manner.
Abstract:
Process for producing powdery amyloses having excellent solubility, adsorption and other properties, by hydrolyzing a gelatinized starch solution with isoamylase to a straight-chain amylose solution, slowly cooling said solution thereby forming a crystalline precipitate, and then drying the precipitate by spraying at a low temperature.
Abstract:
PROCESS FOR PRODUCING A RELATIVELY LOWMOLECULAR AMYLOSE HAVING STRAIGHT CHAIN STRUCTURE ON A COMMERCIAL BASIS BY SELECTIVELY HYDROLYZING WITH A-1,6-GLUCOSIDASE ONLY THE BONDS OF THE BRACHED PARTS IN AMYLOPECTIN MOLECULES CONTAINED IN STARCHES WHICH ARE HIGH MOLECULAR POLYMERS OF GLUCOSE.
Abstract:
PROCESS OF MODIFYING UNGELATINIZED STARCH WHICH INCLUDES ADDING A WATER SOLUBLE ALKALI METAL SALT OF AN AMPHOTERIC METAL COMPOUND TO AN AQUEOUS STARCH SLURRY TO ACHIEVE A PH IN THE RANGE OF 9 TO 12.5. THE PROCESS IS CONDUCTED AT TEMPERATURES BELOW THE GELATINIZATION TEMPERATURE OF THE STARCH.
Abstract:
Pregelatinized starches are prepared by pasting an aqueous slurry of a starch which contains at least 50 percent amylopectin at a temperature of at least 300* F, and then rapidly, preferably instantaneously, removing the water therefrom as by roll or spray drying. The resultant products rapidly disperse in water to form smooth pastes which are characterized by low initial viscosity and minimal setback.