摘要:

AbstractOn the Protein in Potato, Maize and Rice StarchThe protein content of potato, maize and rice starch was determined, and 21 amino acids could be identified. With the usual hydrochloric acid hydrolysis to set free the amino acids a portion (residual protein) remains in the dark residue (melanine), and can be isolated only after destruction of the latter, e.g. with sodium chlorite, and analyzed for amino acids.As shown by the nitrogen determination after Kjeldahl and amino acid analysis potato starch has the lowest, maize starch a mean and rice starch a high content of amino acids. The total amount of nitrogen in the amino acids compared with the Kjeldahl nitrogen is only 83% for potato protein and 80% for maize and rice protein. The residue from hydrolysis can vary substantially.

ISSN:0038-9056    

DOI:10.1002/star.19730250602

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

摘要:

AbstractAn enzymatic assay method was developed for the quantitative determination of transglucosidase activity in commercial glucoamylase preparations. The method is based on the determination of residual glucose after incubation of the glucoamylase preparation with this substrate under welldefined conditions (pH 4,2 and 30°C). Glucose determination was carried out by the glucose oxidase‐peroxidase method and transglucosidase activity expressed in international enzyme activity units. The over‐all time requirement of the analysis is 3 h with liquid and 26 h with powdered preparations. The variation coefficient was less than 3% in the former and 4% in the latter case. Optimum substrate concentration was found to be 8,3% w/v, higher glucose concentrations markedly inhibited the reaction at 30°C. Temperature optima were observed at 40 and 50°C, respectively, more elevated temperatures up to 60°C caused a strong decrease in a

ISSN:0038-9056    

DOI:10.1002/star.19730250603

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

摘要:

Sugars Formed During Irradiation of Maize Starch. Identification and DeterminationSugars of low molecular weight formed during irradiation of maize starch were identified and determined by ion exchanger chromotography. The following sugars were found: one disaccharide (maltose), hexoses (glucose, mannose, galactose, fructose), pentoses (arabinose, xylose, ribose), and one tetrose (erythrose). There remains a slight uncertainty in the cases of mannose and erythrose.The influence of irradation conditions (dosis, atmosphere, temperature), of starch properties (bumidity, impurities, glucosidic bonds), and of storage conditions was examined. By the results it was made possible to propose a hypothesis on the kind of sugar formation and on the role of water in this process, which takes the observed differences into consideration satisfactorily.Irradiation effects have been compared to those given by heating.

ISSN:0038-9056    

DOI:10.1002/star.19730250604

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

摘要:

On the Limit of Detectability of Amylose and Amylopectin in Mixtures. Chromatographic TestsDetection of smaller amounts of amylopectin in amylose by column chromatography as well as by paper chromatographic capillary analysis is rather difficult. In the latter test procedure a faint detectability of amylopectin is reached only at a 6:4 amyloselamylopectin ratio. By column chromatography amylopectin can already be traced at a 8:2 amyloselamylopectin ratio. The intenser blue colour of the amylose‐iodine complex covers the amylopectin in particular zones on the Al2O3‐column and on the paper chromatographs, whereas amylose in smaller amounts can be traced without difficulty in amylopectin preparations.The question, wether the v3‐zone which appears at a higher intensity with amylopectin is identical with the one that appears during degradation of starch and amylose by thermal process, acid hydrolysis, fermentation or oxydation, has yet to be s

ISSN:0038-9056    

DOI:10.1002/star.19730250605

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

摘要:

Fodder Production from Potato Fruit Juice as a Problem of Environmental Protection and NutritionFodder manufacture from potato fruit juice is not a permanent solution for the effluent problem of the starch industry. The cost of processing of the bio‐industry wastes caused by this fodder are higher than those of destruction in the starch industry itself.Use of the nitrogenous substances for human food should be increased, for which they are well suitable. The protein should be marketed in wet form under its own nam

ISSN:0038-9056    

DOI:10.1002/star.19730250606

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19730250607

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19730250608

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19730250609

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19730250611

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19730250615

出版商:WILEY‐VCH Verlag GmbH    

年代:1973

数据来源: WILEY