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  • 1975-1979  (3)
  • 1970-1974  (1)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 44 (1979), 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: The activity of a betacyanine decolorizing enzyme present in raw beet tissue has been confirmed. The enzyme is postulated to be bound to the inner membrane of the cell wall. Comparison between the rate of betacyanine degradation for solutions containing the crude enzyme extract and solutions of identical pH and temperature void of enzyme indicated optimum enzyme activity at pH 3.4 and 40°C. Sample evaluations were made from 22–55°C over a pH range 2.0–4.8. Minimal enzyme activity was noted at pH and temperature extremes. The activity of this enzyme must be considered as an important factor in the extraction of raw beets and during storage and food product utilization of beet juices in that residual enzyme activity may decolorize substantial amounts of the betacyanine pigments. The enzyme has been found present in diffusion-type beet juice.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 43 (1978), 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: The continuous stepless counter-current De Danske Sukkerfabrikker diffusion apparatus originally developed to recover sugar solids from sugar beets was studied as a physical procedure to recover apple juice. This procedure was compared with apple juice recovery using a Willmes press which is an example of a batch mechanical pressing operation. Crinkle-cut apple slices 3 mm in thickness were introduced into the diffuser and heated from 55–75°C. The cell sap containing soluble nutrients was diffused through the apple cell membrane and extracted by heated potable water flowing under the force of gravity. The diffusion-type juice soluble solids yields were 13.47% higher than those for the press-type juices and resulting extracted pomace was low in waste-soluble solids. Sensory comparisons between the pressed and diffusion juices showed preference for the pressed product.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 39 (1974), 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: Dimethyl sulfide (DMS) was the most abundant aroma volatile in cooked sweet corn head-space, followed by ethanol, acetaldehyde, hydrogen sulfide (H2S), ethanethiol, methanethiol and another unidentified compound unique to processed corn. Based on sensory monitoring of GC column effluents, DMS was determined as the primary factor in cooked corn aroma along with H2S, methanethiol and, to a lesser degree, ethanethiol. Also detected in the effluents, but probably of lesser importance, were acetaldehyde, ethanol, and a “grainy” smelling compound in processed corn. When panelists were asked to score corn of widely varying characteristics for aroma, sweetness, texture and overall flavor, it was found that aroma contributed 15% to the flavor response while sweetness and texture contributed 55% and 30%, respectively.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food quality 1 (1977), S. 0 
    ISSN: 1745-4557
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cooked sweet corn aroma volatiles were analyzed by gas chromatography using a headspace technique. Aroma profiles of corn from early and late plantings, different stages of maturity, different cultivars, and different processes were submitted to stepwise discriminant analysis (BMD-0–7M). Processes were most often classified correctly with slight overlaps between brine-pack canned cron and vacuum-packed canned corn and more notable overlapping between frozen and vaccum frozen corn. Corn from different plantings were classified correctly about two-thirds of the time on the basis of their aroma profiles. Stylepak and NK199 cultivars were most often classified correcltly; similarities expressed in overlapping classifications were apparent among Butersweet, Silver Queen NK199 and among code 556, Buttersweet and Silver Queen. Fancy grade corn was correctly classified about 45% of the time, extra standard about 67% of the time, and standard about 68% of the time. By strafifying the data by processing method prior to discriminant analysis, improved classification was achieved for cultivars and maturities.
    Type of Medium: Electronic Resource
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