摘要:

AbstractStarch damage of 10.9 and 15.7%, respectively, in break and reduction flours of commercial hard wheats was increased to 16.0 and 28.6%, respectively, by pin milling. Attrition milling and cryofreezing prior to pin milling resulted in less pronounced starch damage, apparently due to reduced heat evolution and mechanical stresses as evidenced by the intensities of the X‐ray diffraction patterns. Pin‐milled flours exhibited chipping and splitting of starch granules as compared to surface abrasions and deep pitting on the granules from attrition‐milled flours. It appeared that the latter flours would be more suitable for air classification of hard wheat flours into protein concentrates and starch frac

ISSN:0038-9056    

DOI:10.1002/star.19860380802

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractGranular, cold water soluble (GCWS) wheat and corn starch can be prepared by heating in aqueous alcohol and evaporating the solvents. GCWS starch was characterized by light and electron microscopy, x‐ray diffraction, HPLC, enzymic hydrolysis, the Brabender Amylograph, and differential scanning calorimetr

ISSN:0038-9056    

DOI:10.1002/star.19860380803

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractCoexistent effects of citric acid and acetic acid on gelatinization of potato starch and corn starch are discussed and some difference was found in citric acid but not in acetic acid on potato starch, although any difference was not found between both acids on corn starch. The amylogram of potato starch with EDTA treatment and CaCl2treatment supports a presumption that removal of calcium ions bound to phosphate in the starch with citric acid should be responsible to the above acid effect.

ISSN:0038-9056    

DOI:10.1002/star.19860380804

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractGraft copolymerization of acrylamide (Aam) onto starch using ferrous‐starch thiocarbonate‐persulphate redox system was investigated under different conditions including alkali concentration in the precarbon disulphide treatment, potassium persulphate concentration, ferrous ion concentration, monomer concentration, pH of the polymerization medium, polymerization temperature, use of solvent/water mixture instead of aqueous medium, and liquor ratio. The role of thiocarbonation on the magnitude of grafting of acrylamide onto starch has been studied with respect to K2S2O8and ferrous ion concentrations. The graft yield was significantly favoured in acidic medium as well as by increasing the persulphate concentration, acrylamide concentration, and polymerization temperature. Carbon tetrachloride constitutes the optimal medium for polymerization. Grafting was also favoured in either higher or lower liquor rat

ISSN:0038-9056    

DOI:10.1002/star.19860380805

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractThe storage stability of 50% w/w maldodextrin solutions required for clinical feed preparations has been further studied. The presence of inorganic ions has been shown to have an adverse effect whilst the addition ofD‐glucose and surfactants have a limited degree of improvement in the storage stability. The use of citric acid to adjust the pH of the product to pH 3.0 to 3.5 provides a valuable stabilization effect (compared with the similar use of hydrochloric acid). Further rapid methods to evaluate the long term stability (which includes osmolarity measurement, iodine binding capacity and methanol precipitation/titration) are described and the results obtained compared to the existing information on the staling of bread and retrogradation of starch and amylose solution

ISSN:0038-9056    

DOI:10.1002/star.19860380806

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractPrototrophic revertants were obtained from 4 auxotrophic mutantsA. niger, 2 of which originated from amylolytically highly active prototrophA. nigerC, whereas 2 from weakly active prototrophsA. niger23 and 71. A hundred of revertants randomly chosen from each group were initially evaluated with respect to total amylolytic activity. Ten revertants which in this respect reached the highest indices were closely studied in regard to the synthesis of glucoamylase. All of them showed a distinct increase in the activity of this enzyme in relation to their ancestor both auxotrophic and prototrophic. In the case of revertants, derivatives ofA. nigerC prototroph, maximal glucoamylase activity increased over 40%. Among the derivatives ofA. niger71 prototroph the increase in glucoamylase activity exceeded many times the level of glucoamylase activity of its prototrophic ancestor.

ISSN:0038-9056    

DOI:10.1002/star.19860380807

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19860380808

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19860380809

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19860380810

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19860380811

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY