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  • Blackwell Publishing Ltd  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 52 (1987), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Decreased processing temperatures and times were used in conjunction with a commercial heat-stable α-amylase preparation (Termamyl 120L) to liquefy the starch fractions of long and short grain varieties of rice. Yields of liquefied starch in excess of 82% dry flour weight (94% total starch) were obtained using a single-step process and did not require prior heat treatment to gelatinize the starch. Maximum reducing sugar concentrations for both varieties were obtained at 7o°C, while liquefied starch yields were highest at 80–90° and 90°C for the short and long grain, respectively. HPLC analyses of the low molecular weight saccharides (DP l–10) showed similarities in product profiles between short and long grain samples processed at the same temperatures.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 54 (1989), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Maltodextrins were produced from milled rice flour in a single-step process using a heat-stable α-amylase preparation. The starting solids content was 30% (w/w), and processing temperatures and times were varied between 70–97°C and 15–75 min, respectively. Optimum liquefied starch yields, which accounted for virtually all of the starch present, were obtained at temperatures of 80°C and above, but reducing sugars and DE values were highest at 70°C. Low molecular weight saccharide concentrations (DP 1–10) were greatest at 80°C. Because processing at temperatures of 90–97°C resulted in decreased levels of reducing sugars and DP 1–10 concentrations without providing a substantial increase in solubilized starch yields, it was concluded that rice maltodextrins could be most effectively produced at a processing temperature of 80°C.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 54 (1989), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Preparative gel filtration chromatography using Sepharose CL-6B was utilized to obtain working quantities of dissociated rice glutelin polypeptides. Rice flour samples were extracted and fractionated using dilute Tris buffer containing either 0.5% SDS, 6M urea or 8M urea. Gel filtration under each set of extraction conditions yielded fractions containing dissociated acidic and basic glutelin polypeptides, but acidic polypeptides were more effectively separated from basic polypeptides in urea than in SDS. The presence of glutelin polypeptides in higher molecular weight aggregates under each set of buffer conditions indicated that the dissociation of these components during extraction was not complete.
    Type of Medium: Electronic Resource
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