摘要:

AbstractThe small granule starch from cow cockle, pigweed, catch fly and several varieties of dasheens was examined. Although the data suggested that absence of pasting peak, the cooking stability and lack of set‐back may be associated with granule size it must due to granule structure since these characteristics were not observed with small granule barley starches. An examination of the “chunk” starch from pigweed indicates that the small granules are cemented together with non‐granular

ISSN:0038-9056    

DOI:10.1002/star.19780300602

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

摘要:

AbstractA formula for the relationship between regain and crystallinity of starch is given. Accessibility of crystalline portion of starch is in the range of that of cellulose. The saturated moisture state shows six molecules of water per glucose residue. The sorption cannot take place at the inside of crystalline portion of starch.

ISSN:0038-9056    

DOI:10.1002/star.19780300603

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

摘要:

AbstractStarch granules were observed by a scanning electron microscope in order to provide information concerning the types and extent of damage of the surface and internal structure of starch granules attacked by amylases. Granules resistant to the action of amylases, namely, potato, yamanoimo, and high‐amylose maize starches showed shapes and surfaces similar to the intact granules after the action of eitherRhizopusglucoamylase or crystalline bacterial α‐amylase. Granules susceptible to amylases, namely, normal,waxy, soft starch, andsoft starch opaque‐2 maize starches showed numerous pin holes on the surface layer and pores penetrated into the inner layers of the granules during the attack with amylases. In the case of α‐amylolysis, it is apparent that once the enzyme has penetrated into the inner layers of a granule, the layers are more readily attacked than the peripher

ISSN:0038-9056    

DOI:10.1002/star.19780300604

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

摘要:

AbstractScanning electron microscopy (SEM) was used to study the microscopic changes as well as to obtain information on surface structure of potato cells as affected by the Add‐Back (A – B) and the Freeze‐Thaw (F – T) processes for potato granule production. This SEM information was then related to other data on granule processing and end‐product quality. A comparison of the two types of the processes and product

ISSN:0038-9056    

DOI:10.1002/star.19780300605

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

摘要:

AbstractThe kinetics of the simultaneous isomerization and hydrogenation of glucose are studied, and the experimental results are described with a simplified reaction model. By simulating the course of the reactions with a computer the rate constants were determined, and the energies of activation were calculated. From an Arrhenius plot the apparent isomerization activation energies were deduced. Under the experimental conditions a yield of 27% mannitol was obtained starting from glucose. Higher yields can be obtained at low temperatures and low catalyst concentrations.

ISSN:0038-9056    

DOI:10.1002/star.19780300606

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

摘要:

AbstractDegree of substitution (DS) of starch xanthate is easily determined by titration with sulfuric acid and sodium hydroxide solutions using a technique designed to minimize interferences from byproducts. Xanthate contents measured by titration agree well with those determined from S‐benzyl derivatives. Standard deviation at the 0.14 DS level was 0.007 with 11 degrees o freedo

ISSN:0038-9056    

DOI:10.1002/star.19780300607

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19780300608

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19780300609

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19780300613

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY

ISSN:0038-9056    

DOI:10.1002/star.19780300616

出版商:WILEY‐VCH Verlag GmbH    

年代:1978

数据来源: WILEY