ISSN:0038-9056    

DOI:10.1002/star.19970490102

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

摘要:

AbstractLow moisturized potato, sweet potato, corn and wheat starches were treated with a flow tester under heated and heated‐sheared conditions. The starches depolymerized into lower molecule by longer heating time at 150°C. With an increase in heating time, the cold water solubility of starches increased and the degree of depolymerization progressed. Comparing heated treatment with longer heating time and heated‐sheared treatment, 60—120min heating was necessary for heated specimens to obtain similar cold water solubility and degree of depolymerization of heated‐sheared specimens. These results conducted that heated‐sheared treatment strongly promoted the depolymerization of low moist starches under high temperature as compared with heated treatment only. From the results of λmaxof iodine‐polysaccharide complex, there was almost same molecular state between heated for longer time and heated‐sheared treatment. Both amylose and amylopectin depolymerized into lower molecule by

ISSN:0038-9056    

DOI:10.1002/star.19970490103

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

摘要:

AbstractHemicellulases used in the wheat separation process have resulted in better separation, purer fractions, increased plant capacity, reduced processing time etc. In order to further improve enzyme‐treatment in the wheat separation process, monocomponent xylanases were evaluated. A laboratory viscosity model has been set up to evaluate the xylanases. The model showed good correlation (for a commercial hemicellulase preparation used for wheat separation) between viscosity of the wheat flour slurry and the sludge/supernatant ratio after centrifugation of the slurry.A xylanase (Novozyme 867) with excellent performance in the wheat separation process has been found. The xylanase has high activity towards soluble arabinoxylan and gives a rapid viscosity reduction of wheat flour slurries. The enzyme also has a moderate activity towards insoluble arabinoxylan, but due to the low molecular weight of the solubilized material this was not was found to contribute negatively to the enzymes' performance. The pH and temperature conditions in the wheat separation process were well within the active range of the enzyme.A pilot plant experiment showed improved yield of gluten and A‐starch, with no apparent negative effect on the gluten qual

ISSN:0038-9056    

DOI:10.1002/star.19970490104

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

摘要:

AbstractNormal corn starch was extruded with palm, peanut and coconut oils; myristic, stearic and behenic acids and three monoglycerides in a C. W. Brabender single screw laboratory extruder at 140°C barrel temperature, 140rpm screw speed and 22% moisture content. Microstructure of extrudates was studied using a scanning electron mircocope. The pore size distribution, pore volumes and shear strengths of the extrudates were also studied. Addition of lipids resulted in modification of pore size distribution and pore volumes depending on the type of lipid. Complexing lipids gave lower pore volumes, smaller size pores, lower porosities and higher shear strengths of the extrudates. Porosity correlated well with the shear strength values

ISSN:0038-9056    

DOI:10.1002/star.19970490105

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

摘要:

AbstractThe cooperative concomitant action of maltose phosphorylase (MP), trehalose phosphorylase (TP), β‐amylase and a starch debranching enzyme (pullulanase, isoamylase) was investigated to develop a more efficient method for preparing trehalose from starch.About 40 and 51—56% as solid basis of 25% (w/v) liquefied potato starch were converted to trehalose by the combination of soybean β‐amylase and the crude enzyme preparation (MTA) containing MP, TP and a saccharogenic amylase from a strain (SH‐35) ofPlesiomonasin the absence and presence of a starch debranching enzyme, respectively.A stable maltose syrup (70%, w/w) containing about 30% trehalose in the dry solid was prepared from starch directly, and about 36% as dry basis of the mother liquor (70%, w/w) containing about 56% trehalose was obtained as crystals of this non‐reducing disaccharide by conventional crystallization.Trehalose in the by‐product obtained after removing crystals increased up to almost that of the mother liquor by reacting with MTA again.By the method reported here, trehalose was produced from starch on an industrial scale without any remainin

ISSN:0038-9056    

DOI:10.1002/star.19970490106

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

摘要:

AbstractThe optimum conditions for the production of trehalose from starch were investigated using two thermostable enzymes, maltooligosyl trehalose synthase (MTSase) and maltooligosyl trehalose trehalohydrolase (MTHase), fromSulfolobus acidocaldariusATCC 33909. The optimum pH was 5.5 and the optimum temperature was 55—57°C using isoamylase fromPseudomonas amyloderamosaas a debranching enzyme. The addition of CGTase to the reaction mixture during the saccharification process caused an increase in trehalose and a decrease in maltose and maltotriose. Isoamylase was better than pullulanase as a debranching enzyme. The yield of trehalose was independent of the type of starch used. Under optimum conditions, the yield of trehalose from corn starch at 30% concentration was more than 8

ISSN:0038-9056    

DOI:10.1002/star.19970490107

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

摘要:

AbstractDie Anwendung der zuvor beschriebenen alpha‐Glucane setzt spezielle, in der Pharmazie eingeführte Techniken der Wirkstoff‐Träger‐Kombination voraus, welche zu den Hauptprodukten „Mechanische Gemische”︁, „Feststoffdispersionen”︁ und „Mikropartikeln”︁ führen. Zu ihrer Charakterisierung verbreitet angewandte Prüfmethoden werden zusammengefaßt dargestellt.Schlußfolgerungen beziehen sich auf allgemeine Tendenzen künftigen Einsatzes von alpha‐Glucanen und spezieller St

ISSN:0038-9056    

DOI:10.1002/star.19970490108

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19970490109

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19970490110

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19970490111

出版商:WILEY‐VCH Verlag GmbH    

年代:1997

数据来源: WILEY