ISSN:0038-9056    

DOI:10.1002/star.19720240102

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

摘要:

Abstractα‐Amylase was prepared from an extract of malted rye flour by heat treatment to inactivate β‐amylase and other contaminating carbohydrases, followed by continuous electrophoresis. This yielded two isoenzymes which differed considerably in physical properties, although their action patterns appeared to be similar. These findings have been compared with the results of studies on α‐amylase isoenzymes from other

ISSN:0038-9056    

DOI:10.1002/star.19720240103

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

摘要:

AbstractVarious reaction variables in the hydrogen peroxide oxidation of starch in the presence of UV light have been investigated. Higher carboxyl and carbonyl contents of oxystarches were obtained under acidic than under alkaline conditions. Extent of oxidation was found to increase with time. Increasing the concentration of hydrogen peroxide results in an increase in the carboxyl and carbonyl contents. Apparently, air has no effect on the degree of oxidation whereas, oxygen seems to accelerate it.

ISSN:0038-9056    

DOI:10.1002/star.19720240104

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

摘要:

AbstractThe exponential relation between degree of substitution (DS) and reducing power of pancreatin digests of hydroxypropyl starches, found in an earlier study, is explained by means of a statistical model. The model is based on the assumption that the hydroxypropyl groups are distributed at random over the starch molecules. It is shown that in that case the reducing power of the pancreatin digests is a function of (1 – DS)j. In this equation j is a constant; from the available data its numerical value was estimated to be 5.3. This result is interpreted as an indication that the pancreatic enzymes act only upon α(1→4) glucosidic chains containing five or more glucopyranose u

ISSN:0038-9056    

DOI:10.1002/star.19720240105

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

摘要:

AbstractProof for Irradiation of Starch. Working Rules and Application to Various Starches. The test which is proposed for the proof of irradiation of starch is based on the determination of the malonaldehyde – which is formed by irradiation – by means of 2‐thiobarbituric acid. The study was made on the alteration of the aldehyde content of 3 starches (maize starch, pregelatinized maize starch, potato starch) which had been irradiated with 400 Krad and stored at different temperatures. If water content of the sample, storage temperature and duration of storage are known, the original irradiation dose can be calculated by the obtained graphs. These calculations are of variable precision in the specific cases. It is possible to determine the irradiation of maize starch having been stored for three months at 25 °C, provided that the irradiation dose had been of at least 2

ISSN:0038-9056    

DOI:10.1002/star.19720240106

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

摘要:

AbstractThe experimental data shows that the carbohydrate — borate complexes can be investigated by gas liquid chromatography. One of the advantages of this procedure is the possibility of observing the behavior of the α and β anomers in the presence of borate, a possibility unavailable when electrophoretic, conductometric or pH changes are used in the study of borate carbohydrate comple

ISSN:0038-9056    

DOI:10.1002/star.19720240107

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

摘要:

AbstractGraft copolymers of starch and the vinyl monomers acrylamide (I) and acrylic acid (II) – prepared by γ‐radiation induced grafting reactions – and a graft terpolymer of starch, I and II – prepared by base hydrolysis of a graft copolymer of starch and acrylonitrile (III) — have been evaluated as textile print paste thickeners. Preparation, characterization and evaluation procedures are presented together with results illustrating that starch poly (I) containing 39% poly (I) and starch poly (I, II) containing a mixture of 21% I and 37% II are effective thickeners in this application if used in combination with one another or with commercial thickeners such as algin (sodium

ISSN:0038-9056    

DOI:10.1002/star.19720240108

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

摘要:

AbstractEnzymatic Direct Saccharification of the Starch of Intermediate Products of Maize Starch Industry. A new process for direct enzymatic saccharification of starch in wet‐milled, degermed steeped maize is proposed. Utilization of this product instead of dry‐degermed maize fractions is of advantage as maize germs are obtained in pure form about 50% fat in DS. Moreover, highest possible extraction of soluble maize components by the steeping process and simultaneous optimal loosening of the starch‐gluten structure are ach

ISSN:0038-9056    

DOI:10.1002/star.19720240109

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

摘要:

AbstractImproved Starch Settling Tables Test Plant for the Laboratory Separation of Starch and Gluten of Maize.An apparatus for separation of starch and gluten as part of the laboratory determination of the processing value of maize for wetmilling is described. The apparatus consists of a mobile chassis and a starch settling tables‐plant with collimating equipment which guarantees fast readiness for operation and precise adjustment of the incline of the settling tables and thus high reproducibility of test result

ISSN:0038-9056    

DOI:10.1002/star.19720240110

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19720240111

出版商:WILEY‐VCH Verlag GmbH    

年代:1972

数据来源: WILEY